Pneumatic control valve is widely used in petroleum chemical industry is one of the instrument. It is precisely to work properly in ensuring the normal operation of process plants and production safety have an important significance. Therefore, strengthening the pneumatic valve repair is necessary.
First, repair parts, when the focus of inspection
Check between the body wall: In high-pressure differential and corrosive media of the occasion, body wall, diaphragm of the diaphragm often media impact and corrosion, we must focus on examination of pressure decay;
Check Seat: Due to the work of media penetration, fixed seat screw used in the inner surface susceptible to corrosion Ershi seat relaxation;
Check spool: spool valve to regulate one of movable parts, subject to more severe erosion of the medium, repair should be careful when you check the valve core ministries is corrosion, wear and tear, especially in the case of high-pressure differential, spool of wear due to cavitation caused by cavitation phenomenon is even more serious. Were seriously damaged valve core should be replaced; check Filler: Check the packing asbestos rope is dry, such as the use of PTFE packing, should pay attention to check whether the aging and its mating surface is damaged;
Check the executive body of the rubber membrane is aging, whether the cracking phenomenon.
2, pneumatic control valve with daily maintenance
When the control valve using graphite asbestos as a filler, the filler should be about three months to add a lubricant to ensure the control valve and flexible easy to use. Found filling pressure cap low, should be added fillers, such as found in the dry filler PTFE B sclerosis, should be promptly replaced; should pay attention to inspection tour of the operation of control valve, check valve position indicator and regulator the output is consistent; to have locator control valve should always check the gas source, identify problems and timely treatment; should always maintain a control valve components of health as well as a complete easy to use.
3, common faults and their causes
(A) the control valve does not move. Phenomenon and the reasons for failure are as follows:
1. No signal, no gas source. ① gas source is not open, ② gas supply due to water freezing in the winter, leading to blocked ducts or filters, valve block failure, ③ compressor failure; ④ source of mains gas leak.
2. There is gas source, no signal. ① regulator failure, ② the signal tube leakage; ③ bellows leak locator; ④ regulate film damaged retina.
3. No gas source locator. ① filter plugging; ② valve failure I ③ pipeline leak or blockage.
4. Positioning device has gas supply, no output. Locator orifice plug.
5. There is signal, no action. Spool off ①, ② spool with the social or stuck with the valve seat; ③ stem bending or breakage; ④ spool seat block of frozen or coke dirt; ⑤ implementing agencies do not have the spring due to the long-term rust die.
(B) the control valve moves instability. Phenomenon and the reasons for failure are as follows:
1. Pressure gas source of instability. ① compressor capacity is too small; ② valve failure.
2. The signal pressure instability. ① control system time constant (T = RC) inappropriate; ② regulator output instability.
3. A stable gas supply pressure, the signal pressure is stable, but still stable valve action. ① Locator amplifier ball wear off by the dirt loose, especially with increasing gas consumption will produce the output shock; ② Locator amplifier nozzle baffle is not parallel to baffle nozzle cover not live; ③ Output Pipe, line leak; ④ executive body rigidity is too small; ⑤ stem movement friction large parts of a block in contact with the phenomenon.
(C) regulating valve vibration. Phenomenon and the reasons for failure are as follows:
1. Regulating valve opening at any vibration at all times. ① supporting instability; ② near the source of vibration; ③ spool and bushing wear serious.
2. Regulating valve near the fully closed position vibration. ① big selection valve, often used in small openings; ② single-seat valve media flow on and off in the opposite direction.
(D) regulating valve movements slow. Slow phenomenon, and the following reasons:
1. Stem only in one direction when the slow movement. ① pneumatic membrane leakage of the implementing agencies in the membrane damage; ② implementing agencies in the "O" type seal leakage.
2. When the stem at reciprocating movements are slow phenomenon. ① valve body with sticky material to plug; ② sclerosis or graphite PTFE packing deterioration of asbestos packing a dry lubricant; ③ packing too tightly increases, friction increases; ④ stem not directly lead to friction due to large; ⑤ No The pneumatic control valve positioner can lead to slow movement.
(E) increase the amount of valve leakage. Leakage of the following reasons:
1. Valve fully closed when the leakage of large quantities. ① spool is worn to a serious internal leakage, ② strictly off valve is not a good tune.
2. Valve fail to fully closed position. ① medium pressure too great, the executing agency rigidity is small, loose valve closed; ② of a foreign body within the valve; ③ sintered bushing.
(F) adjustable flow range becomes smaller. The main reason is corrosion smaller spool, so that the minimum flow rate adjustable larger.
Pneumatic control valve failure to understand the phenomenon and the reasons to be symptomatic to take measures to resolve it.
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Thursday, October 28, 2010
Wednesday, October 27, 2010
Solenoid valve and the structure of knowledge of the Selection Principle (b)
Third, security
Solenoid valve generally not waterproof, when the conditions do not allow selection of waterproof type, the factory can be customized.
The highest calibration solenoid valve Nominal pressure must exceed the maximum pressure within the pipeline, otherwise life will be shortened, or have other unforeseen circumstances.
Corrosive liquids should use the whole stainless steel type, strong corrosive fluid should be selected plastic Wang (SLF) solenoid valve.
Explosive environment must choose the appropriate explosion-proof products.
Fourth, economic
There are many general-purpose solenoid valve can be, but can satisfy the above three points should be chosen based on the most economical products.
ball valve
The structure of the principle of the solenoid valve
A: Direct acting solenoid valve
There are normally closed and normally open type two kinds. Type normally closed when power was turned off, when the coil electromagnetic force generated when power to overcome the spring force moving core static core with a direct pull-open valve, media access was; When the coil power disappear when the electromagnetic force, moving iron core in the spring under the force reduction, direct closure of valve port, media access. Simple structure, reliable action, in the zero-pressure and micro-vacuum work. Always the opposite type. If the path is less than the φ6 flow solenoid valve.
Second, step-by-step direct acting solenoid valve
Open the valve using a valve and secondary valve to open even in the one, the main valve and the step-by-step guide so that the electromagnetic valve and differential pressure to open the main valve port directly. When the coil power, the generated electromagnetic force so that core dynamic and static pull-core, I open the valve guide and valve guide I set up on the main valve port, and moving the main spool core together, when the main valve on the Introduction of the pressure chamber through the unloading valve port in the pressure difference and the electromagnetic force at the same time under the spool so that the main upward movement, the main valve to open the flow of media. When the coil power disappear when the electromagnetic force, when the moving core in the self-determination and the role of the spring force to close the valve guide hole, when the media balance the hole in the spool on the main chamber, so that increased pressure on the cavity at this time reduction in the spring and the pressure to close the main valve, drying medium. Reasonable structure, reliable action, zero pressure and reliable when the work. Such as: ZQDF, ZS, 2W, etc..
Third, pilot-type solenoid valve indirectly
This series solenoid valve by the pilot spool valve and main contact channel with the formation of a combination; type normally closed when no power, was switched off. When the coil power, the generated magnetic core so that dynamic and static pull-core, I open the valve guide, the flow of exports of medium, when the main spool to reduce pressure on the cavity, which is lower than the pressure of the import side, the formation of pressure to overcome the spring resistance and the subsequent upward movement, reaching the main valve to open the mouth of the purpose of the flow medium. When the coil power, the magnetic force disappears, the spring force in the core activities under the pilot shut down the mouth reset, when the medium flows from the balance of holes, the main chamber pressure on the spool, and the role of the spring force of the downward movement, Close the main valve port. The principle of open-type is just the opposite. Such as: SLA, DF (φ15 caliber above), ZCZ, etc..
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Principle and types of solenoid valve
History dating back solenoid valve, so far, at home and abroad from the principle of the electromagnetic valve is divided into three categories (ie: direct-acting type, straight moving step by step guide type), while the valve flap from the different structures and materials with the principle of distinction on the branches are divided into six sub-groups (direct-acting diaphragm structure, step by step straight action film structure, the pilot membrane structure, and straight-acting piston structure, step by step straight-acting piston structure, the pilot piston structure).
Direct Drive Type Solenoid Valve:
Principle: power, the electromagnetic coil of electromagnetic force to close the piece from the valve seat on the raised, the valve open; power, the electromagnetic force disappears, the spring pressure in the valve seat to close the cases, the valve closes.
Features: In the vacuum, negative pressure, zero pressure when normal work, but the path is generally not more than 25mm.
Distribution of Direct Drive Type Solenoid Valve:
Principle: It is a direct-acting and pilot-style combination of theory, when the entrances and exits when there is no differential pressure, electricity, the electromagnetic force directly to the pilot valve and main valve off the small pieces in turn brought up, the valve to open. When the entrances and exits to start pressure, the electricity, the electromagnetic force pilot a small valve, main valve cavity under the pressure of increasing the cavity pressure drops, thus the use of upward pressure to open the main valve; power, the pilot valve with a spring or to medium pressure to promote off pieces, moving down, so that the valve closed.
Features: In the zero-pressure or vacuum, high pressure can also be * when the action, but the power of a larger, which calls for horizontal mounting.
Pilot solenoid valve:
Principle: electricity, the electromagnetic force the pilot hole opens, the chamber pressure to drop rapidly to form the closure around the lower parts of high pressure, the fluid pressure to promote off pieces of upward movement, the valve open; power, the spring force to pilot hole closed, the inlet pressure chamber through the bypass hole quickly formed around the closed valves on the high-low under the pressure difference, the fluid pressure to promote off pieces of moving down, close the valve.
Features: limit the scope of a high fluid pressure can be arbitrarily install (need to customize), but must meet the conditions of fluid pressure. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve ball valve V Type Ball Valve
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Direct Drive Type Solenoid Valve:
Principle: power, the electromagnetic coil of electromagnetic force to close the piece from the valve seat on the raised, the valve open; power, the electromagnetic force disappears, the spring pressure in the valve seat to close the cases, the valve closes.
Features: In the vacuum, negative pressure, zero pressure when normal work, but the path is generally not more than 25mm.
Distribution of Direct Drive Type Solenoid Valve:
Principle: It is a direct-acting and pilot-style combination of theory, when the entrances and exits when there is no differential pressure, electricity, the electromagnetic force directly to the pilot valve and main valve off the small pieces in turn brought up, the valve to open. When the entrances and exits to start pressure, the electricity, the electromagnetic force pilot a small valve, main valve cavity under the pressure of increasing the cavity pressure drops, thus the use of upward pressure to open the main valve; power, the pilot valve with a spring or to medium pressure to promote off pieces, moving down, so that the valve closed.
Features: In the zero-pressure or vacuum, high pressure can also be * when the action, but the power of a larger, which calls for horizontal mounting.
Pilot solenoid valve:
Principle: electricity, the electromagnetic force the pilot hole opens, the chamber pressure to drop rapidly to form the closure around the lower parts of high pressure, the fluid pressure to promote off pieces of upward movement, the valve open; power, the spring force to pilot hole closed, the inlet pressure chamber through the bypass hole quickly formed around the closed valves on the high-low under the pressure difference, the fluid pressure to promote off pieces of moving down, close the valve.
Features: limit the scope of a high fluid pressure can be arbitrarily install (need to customize), but must meet the conditions of fluid pressure. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve ball valve V Type Ball Valve
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Typical type pilot relief valve fault diagnosis and troubleshooting
With the hydraulic system of construction machinery moving in the direction of the development of high-pressure and ultrahigh-pressure pilot relief valve type widely used in construction machinery hydraulic system in the control circuit. In the use of the practice, in order to maximize their effectiveness, the protection control system, accurate and timely diagnosis, rule out the possibility of pilot-type relief valve failure is the key element.
1, control failures, so that the fixed host
Pilot-type relief valve failure, the host can not result in action. According to the phenomenon, analysis of reasons: the pilot valve spool spring break; damping plug hole; pilot valve sealing valve port bad; the main spool, such as card dead. Excluded from the corresponding measure is: to replace or in the break pad Jiaping Department to emergency use; cleansing clear; grinding or the circuit breaker to the emergency use; grinding, cleaning.
2, limit pressure instability
Pilot-type pressure relief valve limits instability, the performance of the hydraulic system for low or high pressure, hydraulic actuator, or inability to move the pipeline, pump body, valve burst.
Caused by this failure include: improper pressure adjustment; pilot valve spool bending or soft spring; oil or dirty oil flows have been impeded. Excluded from the corresponding measures are as follows: re-adjustment; correction, plus pad, or replaced; replacement, cleaning.
Pilot-type pressure relief valve limits the gradual onset of instability for the failure, more than an hour in the reserves more motorized mechanical engineering; pilot-type relief valve for the sudden failure of failure, more than an hour in the reserves with less motor works machinery. After the failure in the end rule out the possibility, should the local system to limit the pressure on the pilot-type pressure relief valve to control re-adjustments.
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1, control failures, so that the fixed host
Pilot-type relief valve failure, the host can not result in action. According to the phenomenon, analysis of reasons: the pilot valve spool spring break; damping plug hole; pilot valve sealing valve port bad; the main spool, such as card dead. Excluded from the corresponding measure is: to replace or in the break pad Jiaping Department to emergency use; cleansing clear; grinding or the circuit breaker to the emergency use; grinding, cleaning.
2, limit pressure instability
Pilot-type pressure relief valve limits instability, the performance of the hydraulic system for low or high pressure, hydraulic actuator, or inability to move the pipeline, pump body, valve burst.
Caused by this failure include: improper pressure adjustment; pilot valve spool bending or soft spring; oil or dirty oil flows have been impeded. Excluded from the corresponding measures are as follows: re-adjustment; correction, plus pad, or replaced; replacement, cleaning.
Pilot-type pressure relief valve limits the gradual onset of instability for the failure, more than an hour in the reserves more motorized mechanical engineering; pilot-type relief valve for the sudden failure of failure, more than an hour in the reserves with less motor works machinery. After the failure in the end rule out the possibility, should the local system to limit the pressure on the pilot-type pressure relief valve to control re-adjustments.
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Yee-day life of the valve Innovation
1.3 billion U.S. dollars in cash and 88.9% market share of a valve sufficient to allow any company is only as strong Mammoth - of course you know, I am talking days, Yee valve company, and the ultimate extinction of the mammoth. Not the same as that day also had the opportunity to save Yee valves themselves, and to prove to the world, it is still the world's most clever companies. (Cast Steel Gate Valve ) Is a valve-day counter-qi Velan, to save his own best example. June 2, Tian-qi valve in the global launch of its own (Cast Steel Gate Valve ), In China, it has been translated into ""--。 This is indeed a lucky name. May Feiyang valve market share in the United States has only 8% (4 years to reach the middle back there too), to the first week of new product releases on the sharp rise to 11.1%, followed by the second weeks, and increased the proportion of 1%. It's refreshing. Almost ten years, the product just out on a burst of applause Velan has become an almost-hyun, such as the company's patents, and Tian-qi valve products? Sorry, that is too complex to have further comment on the trial for six months. (Cast Steel Gate Valve ) Does not look the same. This may be the days of the valve core products Yee. Engineers have been informed that those who can give up their traditional strengths, and in accordance with the product as a true to develop. As the product itself, it is everywhere and competitors and to avoid similar tit-for-tat. The most direct change is in (Cast Steel Gate Valve ) Interface, there will be a day to update the background image - Tian-qi valve set up a working group to carefully selected these pictures. Velan or whether it is a large number of imitators, all believed in the "less is more" aesthetic principle, only put in the valve nameplate simple. "In 5 years ago, we (Cast Steel Gate Valve) In fact, the first generation of the structure and any of the companies are doing almost the valve, and now is different." Tian-qi valve, executive vice president of the Institute said. He used a lot of terminology to explain the new (Cast Steel Gate Valve) apart, put it in simple language, if it is that he believes that qi is a new structure of the valve, and can provide more specific functionality. Velan used to the users the feeling that some of this unique product. And all point to the unique characteristics of an intimate, in many people easily lose sight of the small corner of the world, Tian-qi valve consistent with its developers have not lost sight of rigorous and often surprises people. Familiar with the idea of Tian-qi valve observers will find that the significance of this change is that of an Internet product, the cost is no longer a core - since the after-sales service are free of charge - replaced by the user experience. The same as the free, users are no longer loyal to the users who can surprise (even if very small), who will be able to win market overnight. "Dear! Days qi valve is not to give up this game, even though it was such a proposal. To allow these companies to each other to fight for each user calls go, I am sure we will see more in this area of innovation." SEO Savage company and feiyang in velan said after doing a comparison. This is the day you want the effect of valve-qi. Tian-qi CEO valve products for the new five million U.S. dollars approved the promotion of the cost, he said that he signed all the time shaking hands. But to spend more still to come, Tian-qi valve will be in the next 5 years at least annually to the (Cast Steel Gate Valve) in 5-10% of operating profit. Yee valve to-day in 2008 the income of 2.5 billion U.S. dollars, the Tian-qi valve in the next 5 years (Cast Steel Gate Valve) to invest from 500 to 1300 million U.S. dollars. Being laughed at for a long time, the day this time Yee valve finally full strength. Almost from the beginning of the birth of velan, Tian-qi of the large valve, slow, or even the sacred orthodox industrial culture of the industrial sector has become the object of ridicule. A whole decade, the new company from Asia have continued to use some small creative harassment this monster, was a great success, Tian-qi these valves are still only seen as the provocative frivolous. Tian-qi Valve certainly feel strongly that, until his own hand, the market will easily pocket income, or those who can not explain it in the slow years. Talking about (Cast Steel Gate Valve) is a big success too early, but Powell is right, Tian-qi valve is a major mistake not to enter as soon as possible (Cast Steel Gate Valve) the field. And now, despite the lateness of the hour, day-qi valve disease has finally begun to own the. | |
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The structure and application of safety valve
Used to prevent the boiler, pressure vessel or piping and other equipment incurred damage due to overpressure valve. When the fluid pressure to protect the body slightly higher than the normal operating pressure to achieve a certain specified value (ie, the valve opening pressure), the safety valve automatically opens, emissions part of the fluid, so that pressure drop. When the pressure drops to a slightly lower than the normal operating pressure of a certain value (that is, the pressure valve back seat), the safety valve closes automatically stop the discharge of fluids and remain sealed.
Safety valve of the valve flap according to the different loading methods are divided into two types of heavy hammer type and spring-loaded (see Figure [safety valve structure]). Hammer-type was divided into direct heavy hammer type and lever-type heavy hammer. Direct heavy hammer-type safety valve is the first use of a safety valve, only a simple low-voltage small-scale equipment (such as domestic pressure cooker), there are still used. Hammer lever-type safety valve structure is simple, load adjustment, reliable, can be used for low-pressure boiler fixed, but great shape, for vibration-sensitive and the use of some disadvantages such as limitations in industry has been rarely used. The most widely used in industry is the spring-loaded safety valve. It can be designed into many kinds of structural patterns in order to meet a variety of application requirements, such as for large displacement, high pressure, high temperature, there is back pressure on the sealing particularly demanding and so on occasions. Figure [safety valve structure] is a very simple structure, a common spring-loaded safety valve. Relief valve is usually by the use of fluid phase behavior were divided into two categories: one category is used for liquids, and import and export of the same size as the opening height of the smaller flap valve; the other is used for steam and gas export size of large on the import of size, valve flap to open a high degree of large, open very quickly. Valve flap valve can be opened by a high degree of emission classification of space conditions.
If the poor performance of safety valve, or the selection, improper installation can cause a serious accident or economic losses. Therefore, we must strictly comply with the relevant standards and safety monitoring body of the laws and regulations. After a good safety valve adjustment should be locked or seals, reckless unauthorized personnel is strictly prohibited. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
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Safety valve of the valve flap according to the different loading methods are divided into two types of heavy hammer type and spring-loaded (see Figure [safety valve structure]). Hammer-type was divided into direct heavy hammer type and lever-type heavy hammer. Direct heavy hammer-type safety valve is the first use of a safety valve, only a simple low-voltage small-scale equipment (such as domestic pressure cooker), there are still used. Hammer lever-type safety valve structure is simple, load adjustment, reliable, can be used for low-pressure boiler fixed, but great shape, for vibration-sensitive and the use of some disadvantages such as limitations in industry has been rarely used. The most widely used in industry is the spring-loaded safety valve. It can be designed into many kinds of structural patterns in order to meet a variety of application requirements, such as for large displacement, high pressure, high temperature, there is back pressure on the sealing particularly demanding and so on occasions. Figure [safety valve structure] is a very simple structure, a common spring-loaded safety valve. Relief valve is usually by the use of fluid phase behavior were divided into two categories: one category is used for liquids, and import and export of the same size as the opening height of the smaller flap valve; the other is used for steam and gas export size of large on the import of size, valve flap to open a high degree of large, open very quickly. Valve flap valve can be opened by a high degree of emission classification of space conditions.
If the poor performance of safety valve, or the selection, improper installation can cause a serious accident or economic losses. Therefore, we must strictly comply with the relevant standards and safety monitoring body of the laws and regulations. After a good safety valve adjustment should be locked or seals, reckless unauthorized personnel is strictly prohibited. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
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How to choose Temperature Control Valve
With the heating system reform, household heat metering and sub-room temperature control has entered the implementation stage, the temperature control valve is installed in the radiator is already very popular, and with the temperature control valve to achieve sub-room temperature control, both the maximum energy conservation, but also satisfy different user needs for indoor temperature regulation is a good thing benefits the country, but how to select temperature control valve did not fully allow users to grasp, if not the right choice of products, not only to can not meet demand, and may give users an unnecessary economic losses, for which the author according to their own application experience, in which published some of my views, designed to give colleagues and users some useful help.
Temperature control valve is installed on the water pipes in the radiator temperature regulation (actually flow regulation) of a device. Manual and automatic temperature control valve is divided into two kinds of temperature control valve, automatic temperature control valve is also called Self-operated temperature control valve or automatic thermostat valve, are also referred to as the thermostat valve. Automatic temperature control valve is a temperature sensor Self-executing agencies and special supporting temperature control valve body composition.
Thermostatic valve valve's structure often straight, angle valve two of the most common two-way valve. Two-way valve is mainly used for two-pipe system or a specially designed a new single-pipe system. In recent years, according to single and double pipe system differences, but also post-graduate output of a single-pipe system specifically applicable to the three links-style temperature control valve and the use of covert installation of suitable single-, double-tube system, a special four-way valve. The four-way valve is currently more common in imported products, such as Italy Jiekemini (GIACOMI-NI) of the four-way valve, which applies not only to all kinds of radiators, and it applies to single and double control systems, but also the ability to to meet the dark filled with a variety of pipe connections.
Thermostatic valve usually have manual, automatic two kinds, the principle of the valve movements are very different. Manual temperature control valve usually spiral lift spool, rotating handle designed a straight line through the spiral into a spool displacement. And automatic temperature control valve in order to meet the temperature sensor specific self-implementing agency of the straight-line moves, spool movement is usually designed to automatically reset the direct linear displacement, therefore the body under normal circumstances are not interchangeable. But there are also interchangeable, a specially designed valve can be generic, that is, automatic temperature control valve of the valve, attach a suitable manual screw lifting mechanism, can be realized manually, automatic common exchange between the two. This is particularly suitable to improve the situation in China have great practical value, in the present, many projects, developers in order to save the initial investment, first install a valve with automatic temperature control feature along with the spiral movements with special handles, so that both the achieved with 1 / 3 the cost of automatic temperature control valve (the price of basic equivalent to manual temperature control valve) for a manual temperature control valve, and gave the user automatic temperature control in the future to upgrade the space left behind. Even in the imports of this product is also rare in this area of Italy Jiekemini walk in front of the market provides such a range of manual, automatic temperature control valve between a known pairs adjustable temperature control valve, eight stalls setting, the indoor temperature as you set up, extremely convenient. Worthy of the world's larger HVAC valve suppliers. It is this range of manual and automatic temperature control valve of the valve between the particularity of, so choice will be complex, this complexity is not fine for some business people and caused speculation salesman "Fish-in-Water-Belt-Buckle-246.html' target='_blank' class='infotextkey'>fish in" The opportunities. In this I remind that, in the current market there are a lot of automatic temperature control valve suppliers salesman will carry a simple adjustment handle automatic temperature control valve body of the net charge as a dual regulatory function of the temperature control valve to the user recommended, and some users to use such a temperature control valve, which is not very appropriate, there are great risks, so that although the automatic temperature control valve body with a simple adjustment on the handle, but the handle design idea of the automatic temperature control valve in order to meet the valve before the first installation of temporary works for the system adjusted to meet the test of water pressure test only, test the water pressure in the test process is completed, be replaced by automatic temperature control valve valve head, because it temporary, so the easy adjustment of the valve handle on the original loan for a fixed temperature control valve head for helical screw lifting the ordinary use. We all know that simple adjustment handle because of its temporary, one-time, generally use plastic, if used as the final frequency adjustment, the thread wear is very fast, not to mention working in the heating system, the spool up and down movements where there is a certain pressure circumstances, even in the absence of pressure systems, the spool itself alone will greatly speed up the spring pressure on the thread handle wear and tear, so use this product as can be upgraded to automatic temperature control valve of the Manual temperature control valve is not appropriate.
I studied Italian Jiekemini that can be upgraded to automatic temperature control valve known as the double-adjustable temperature control valve, and other brands the biggest difference is that it is not a temporary one-time adjustment handle products, but specially designed application of the final product has a durable, spiral-shaped teeth thread lift is a special wear-resistant trapezoidal force, pitch up to 4.5mm. There is no worry about long-term use is, of course, temporary use of more no problem. The general regulation of the handle of the temporary borrowing of the thread teeth fixed for the fine thread, thread for general triangular-shaped teeth, the pitch of only 1.5mm. Such temporary handle to rotate three times the displacement of spool 4.5mm pitch with trapezoidal thread lap rather, it means that you will open the valve from the smallest to the largest three times the time required, which often need to adjust the temperature and control valve for regulating the inconvenience is obvious.
Let's look at automatic temperature control valve, automatic temperature control valve is usually divided into two parts, valve and valve head, valve commonly used method of production of copper casting or hot forging, valve head temperature sensors are generally divided liquid and solid: solid is divided into two kinds: one is the La-system, a hot-memory alloy. Currently on the market the popular media, most of paraffin solid sensor, with little heat memory alloy. Here's the market that are common to the respective valve and valve head to make a simple introduction to automatic temperature control valve for selection for reference.
Temperature Control Valve Body: Copper casting has the advantage of casting-shaped cavity can be complex products, mold cost less, lower production costs, but the drawback is more than casting defects, materials, compressive strength is poor; In contrast, the copper body by forging dies high value and complexity of forging equipment, production costs are high, but was able to obtain high-strength products, pressure capability is also much higher than the casting, while effectively avoiding casting defects. Thus less complex shape of the body, the professional manufacturers adopt traditional methods of forging body. But there are also some manufacturers to use traditional methods of casting, this requires the user to distinguish carefully. I think the use of a radiator temperature control valve on the valve body are simple, using hot forging is very appropriate.
In the selection body should pay attention to detail when there is a lot of valve design in order to be more simple, straight-through valve body inlet and outlet in the same axis, so that while the design is simple, but the displacement of spool space will be subject to We, therefore, the general type of valve spool displacement is only 2-3mm. I studied Italian Jiekemini automatic temperature control valve body, its straight-through body design is very unique, guaranteed entry and exit axis in the same circumstances, with the dislocation channel cavity design, effectively increase the displacement of the spool space, makes the spool displacement of up to 4-5mm, which in a recent design of an automatic temperature control valve is rare. Spool displacement increases the more dirty HVAC water is very beneficial, too small spool displacement in a relatively dirty water and scale HVAC serious cases will be very prone to gridlock.
Thermostatic valve head: Temperature Control Valve head temperature sensor inside the inner filling of liquid and solid media are generally two types of liquid and solid production process due to different manufacturers in general are usually a result of restrictions by the scale of production, often using only one A process to produce liquid or solid valve head, only a few large-scale production of both types of valve head chamber of commerce to facilitate customer choice. As for the difference between the two valve head, I think it should be said in HVAC applications, there is not much difference, if we must point out the difference of the Department, I think in the following aspects: First, different size. Generally speaking, the liquid to achieve the same thermal expansion, a larger displacement of the liquid, so temperature sensor larger, so larger valve heads, with a small proportion of valve sets a little after the lack of coordination, so is preferable to use solid-type valve something more beautiful head. Second, fluid sealing technology to be more complex, the production costs are relatively solid to be a little higher, so sales prices are often higher. 3, the liquid valve head to be a little more sensitive than the solid and this is the only liquid and solid advantages in comparison, but in the HVAC field in terms of a typical large-delay system, this advantage is not much effect. All in all, whether liquid or solid thermostatic valve head, as long as a qualified product, can fully meet the EN215 standard in the time sensitive requirements. I had two Italian Jiekemini medium temperature sensor in nation-building project quality inspection center to compare measurements and found no significant differences.
It is worth mentioning that the Italian Jiekemini the installation of thermostatic valve head is also very unique, the general temperature control valve installation of the first threaded connections are used, rather Jiekemini they used their own patented technology, fast card pressure-type connections, fast and safe, effective and easy to avoid the loose screw connection manually defects.
In the body of the connection alive Festival Jiekemini also has its own patent, that is connected to hot on the live festival PTFE self-dense material, to facilitate the installation or hemp rope without wrapping raw materials, effectively increasing installation of efficiency, and achieve an effective seal.
To sum up, when you want to use temperature control valve should be careful when you transfer the election, so that money can at least make the best choice, whether it is manual, dual-adjustable or automatic temperature control valve, Italy Jie Kemi Nepal can be said is the perfect choice of partner, and complete products, attentive service, all so you can get satisfaction.
Generally speaking, if the most efficient as a choice for investment principles, without regard to the benefits of energy-saving automatic temperature control valve does not consider future upgrades for automatic temperature control valve, then you can choose a purely manual temperature control valve.
If, for with very little investment, taking into account the future by the owners themselves to upgrade to automatic temperature control valve, then the optional dual-adjustable temperature control valve, a dual-adjustable thermostatic valve with pure manual temperature control valve is basically the same price.
If you want to make a one-stop choice, then can choose automatic temperature control valve, generally prices are about three times the manual temperature control valve.
ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve ball valve V Type Ball Valve
We can offer more Knife Gate Valve Information.If you need us according your spcification to produce the Knife Gate Valve .
Need, please e-mail to valve401@gmail.com
Temperature control valve is installed on the water pipes in the radiator temperature regulation (actually flow regulation) of a device. Manual and automatic temperature control valve is divided into two kinds of temperature control valve, automatic temperature control valve is also called Self-operated temperature control valve or automatic thermostat valve, are also referred to as the thermostat valve. Automatic temperature control valve is a temperature sensor Self-executing agencies and special supporting temperature control valve body composition.
Thermostatic valve valve's structure often straight, angle valve two of the most common two-way valve. Two-way valve is mainly used for two-pipe system or a specially designed a new single-pipe system. In recent years, according to single and double pipe system differences, but also post-graduate output of a single-pipe system specifically applicable to the three links-style temperature control valve and the use of covert installation of suitable single-, double-tube system, a special four-way valve. The four-way valve is currently more common in imported products, such as Italy Jiekemini (GIACOMI-NI) of the four-way valve, which applies not only to all kinds of radiators, and it applies to single and double control systems, but also the ability to to meet the dark filled with a variety of pipe connections.
Thermostatic valve usually have manual, automatic two kinds, the principle of the valve movements are very different. Manual temperature control valve usually spiral lift spool, rotating handle designed a straight line through the spiral into a spool displacement. And automatic temperature control valve in order to meet the temperature sensor specific self-implementing agency of the straight-line moves, spool movement is usually designed to automatically reset the direct linear displacement, therefore the body under normal circumstances are not interchangeable. But there are also interchangeable, a specially designed valve can be generic, that is, automatic temperature control valve of the valve, attach a suitable manual screw lifting mechanism, can be realized manually, automatic common exchange between the two. This is particularly suitable to improve the situation in China have great practical value, in the present, many projects, developers in order to save the initial investment, first install a valve with automatic temperature control feature along with the spiral movements with special handles, so that both the achieved with 1 / 3 the cost of automatic temperature control valve (the price of basic equivalent to manual temperature control valve) for a manual temperature control valve, and gave the user automatic temperature control in the future to upgrade the space left behind. Even in the imports of this product is also rare in this area of Italy Jiekemini walk in front of the market provides such a range of manual, automatic temperature control valve between a known pairs adjustable temperature control valve, eight stalls setting, the indoor temperature as you set up, extremely convenient. Worthy of the world's larger HVAC valve suppliers. It is this range of manual and automatic temperature control valve of the valve between the particularity of, so choice will be complex, this complexity is not fine for some business people and caused speculation salesman "Fish-in-Water-Belt-Buckle-246.html' target='_blank' class='infotextkey'>fish in" The opportunities. In this I remind that, in the current market there are a lot of automatic temperature control valve suppliers salesman will carry a simple adjustment handle automatic temperature control valve body of the net charge as a dual regulatory function of the temperature control valve to the user recommended, and some users to use such a temperature control valve, which is not very appropriate, there are great risks, so that although the automatic temperature control valve body with a simple adjustment on the handle, but the handle design idea of the automatic temperature control valve in order to meet the valve before the first installation of temporary works for the system adjusted to meet the test of water pressure test only, test the water pressure in the test process is completed, be replaced by automatic temperature control valve valve head, because it temporary, so the easy adjustment of the valve handle on the original loan for a fixed temperature control valve head for helical screw lifting the ordinary use. We all know that simple adjustment handle because of its temporary, one-time, generally use plastic, if used as the final frequency adjustment, the thread wear is very fast, not to mention working in the heating system, the spool up and down movements where there is a certain pressure circumstances, even in the absence of pressure systems, the spool itself alone will greatly speed up the spring pressure on the thread handle wear and tear, so use this product as can be upgraded to automatic temperature control valve of the Manual temperature control valve is not appropriate.
I studied Italian Jiekemini that can be upgraded to automatic temperature control valve known as the double-adjustable temperature control valve, and other brands the biggest difference is that it is not a temporary one-time adjustment handle products, but specially designed application of the final product has a durable, spiral-shaped teeth thread lift is a special wear-resistant trapezoidal force, pitch up to 4.5mm. There is no worry about long-term use is, of course, temporary use of more no problem. The general regulation of the handle of the temporary borrowing of the thread teeth fixed for the fine thread, thread for general triangular-shaped teeth, the pitch of only 1.5mm. Such temporary handle to rotate three times the displacement of spool 4.5mm pitch with trapezoidal thread lap rather, it means that you will open the valve from the smallest to the largest three times the time required, which often need to adjust the temperature and control valve for regulating the inconvenience is obvious.
Let's look at automatic temperature control valve, automatic temperature control valve is usually divided into two parts, valve and valve head, valve commonly used method of production of copper casting or hot forging, valve head temperature sensors are generally divided liquid and solid: solid is divided into two kinds: one is the La-system, a hot-memory alloy. Currently on the market the popular media, most of paraffin solid sensor, with little heat memory alloy. Here's the market that are common to the respective valve and valve head to make a simple introduction to automatic temperature control valve for selection for reference.
Temperature Control Valve Body: Copper casting has the advantage of casting-shaped cavity can be complex products, mold cost less, lower production costs, but the drawback is more than casting defects, materials, compressive strength is poor; In contrast, the copper body by forging dies high value and complexity of forging equipment, production costs are high, but was able to obtain high-strength products, pressure capability is also much higher than the casting, while effectively avoiding casting defects. Thus less complex shape of the body, the professional manufacturers adopt traditional methods of forging body. But there are also some manufacturers to use traditional methods of casting, this requires the user to distinguish carefully. I think the use of a radiator temperature control valve on the valve body are simple, using hot forging is very appropriate.
In the selection body should pay attention to detail when there is a lot of valve design in order to be more simple, straight-through valve body inlet and outlet in the same axis, so that while the design is simple, but the displacement of spool space will be subject to We, therefore, the general type of valve spool displacement is only 2-3mm. I studied Italian Jiekemini automatic temperature control valve body, its straight-through body design is very unique, guaranteed entry and exit axis in the same circumstances, with the dislocation channel cavity design, effectively increase the displacement of the spool space, makes the spool displacement of up to 4-5mm, which in a recent design of an automatic temperature control valve is rare. Spool displacement increases the more dirty HVAC water is very beneficial, too small spool displacement in a relatively dirty water and scale HVAC serious cases will be very prone to gridlock.
Thermostatic valve head: Temperature Control Valve head temperature sensor inside the inner filling of liquid and solid media are generally two types of liquid and solid production process due to different manufacturers in general are usually a result of restrictions by the scale of production, often using only one A process to produce liquid or solid valve head, only a few large-scale production of both types of valve head chamber of commerce to facilitate customer choice. As for the difference between the two valve head, I think it should be said in HVAC applications, there is not much difference, if we must point out the difference of the Department, I think in the following aspects: First, different size. Generally speaking, the liquid to achieve the same thermal expansion, a larger displacement of the liquid, so temperature sensor larger, so larger valve heads, with a small proportion of valve sets a little after the lack of coordination, so is preferable to use solid-type valve something more beautiful head. Second, fluid sealing technology to be more complex, the production costs are relatively solid to be a little higher, so sales prices are often higher. 3, the liquid valve head to be a little more sensitive than the solid and this is the only liquid and solid advantages in comparison, but in the HVAC field in terms of a typical large-delay system, this advantage is not much effect. All in all, whether liquid or solid thermostatic valve head, as long as a qualified product, can fully meet the EN215 standard in the time sensitive requirements. I had two Italian Jiekemini medium temperature sensor in nation-building project quality inspection center to compare measurements and found no significant differences.
It is worth mentioning that the Italian Jiekemini the installation of thermostatic valve head is also very unique, the general temperature control valve installation of the first threaded connections are used, rather Jiekemini they used their own patented technology, fast card pressure-type connections, fast and safe, effective and easy to avoid the loose screw connection manually defects.
In the body of the connection alive Festival Jiekemini also has its own patent, that is connected to hot on the live festival PTFE self-dense material, to facilitate the installation or hemp rope without wrapping raw materials, effectively increasing installation of efficiency, and achieve an effective seal.
To sum up, when you want to use temperature control valve should be careful when you transfer the election, so that money can at least make the best choice, whether it is manual, dual-adjustable or automatic temperature control valve, Italy Jie Kemi Nepal can be said is the perfect choice of partner, and complete products, attentive service, all so you can get satisfaction.
Generally speaking, if the most efficient as a choice for investment principles, without regard to the benefits of energy-saving automatic temperature control valve does not consider future upgrades for automatic temperature control valve, then you can choose a purely manual temperature control valve.
If, for with very little investment, taking into account the future by the owners themselves to upgrade to automatic temperature control valve, then the optional dual-adjustable temperature control valve, a dual-adjustable thermostatic valve with pure manual temperature control valve is basically the same price.
If you want to make a one-stop choice, then can choose automatic temperature control valve, generally prices are about three times the manual temperature control valve.
ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve ball valve V Type Ball Valve
We can offer more Knife Gate Valve Information.If you need us according your spcification to produce the Knife Gate Valve .
Need, please e-mail to valve401@gmail.com
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