Thermostatic radiator control valves in the 40's as early as the 20th century in Europe, in the early 80s our country has begun to develop and radiator temperature control valve, into the 90's, the latter, with the heat metering policy and technology and the deepening masses of the people of personalized room temperature requirements, a variety of domestic, import radiator temperature control valve products came into being, and many of its projects in China were used.
In the radiator heating the room temperature control can be used to control the radiator temperature control valve, but also better resistance characteristics can be manually controlled valves. Thermostatic radiator valve control of the use of the advantage of being able to control better the use of "free heat" to achieve the purpose of energy conservation, while avoiding the user to repeatedly adjust cumbersome.
First, the radiator temperature control valve as well as the breakdown of the working principle
Radiator temperature control valve and valve body from the temperature controller is composed of two parts. Principles of its users will spin the controller to the desired temperature setting temperature, when the room temperature exceeds the set temperature, the thermostat temperature controller inside the package (with sufficient medium temperature) thermal expansion, the volume increased to promote the stem, the valve clearance small, reducing the water flow radiator, so that at room temperature to reach set temperature. When the indoor temperature below the set temperature, the temperature by the cold shrink package size decreases, with the reset spring spool stem back to the valve opening, increasing the radiator water flow until the temperature reached for value.
1. Thermostatic controller
Thermostat temperature controller package in accordance with its location can be divided into built-in temperature and package type FarEasTone. Package due to feelings of warm ambient air temperature is at the same time regulating valve action as well as changes in temperature have a packet size, so the location of temperature package for the importance of the proper use of valves. In most cases, the need to adjust the radiator in this group are the indoor room temperature, the built package suitable temperature valves. In some specific cases, such as the radiator in this group was blocking the radiator cover, valve cover is located within, or close valves, there are other hot (cold) source, such as cooking, lighting and so strong when the temperature is around the package of local feeling the heat, the room temperature is not accurate, they are advised to adopt FarEasTone type thermostat controller, the sensor can accurately adjust at room temperature suffered strong interference with the smaller local sources of heat in order to achieve accurate control The purpose of the room temperature. In some special systems, such as the level of single-pipe systems, can only be installed in the first group of radiator radiator valves, and adjust the user used the living room or master bedroom room temperature mainly, but also can be FarEasTone type valves, temperature sensors will be placed in the living room or master bedroom collected regulate its temperature. (1) steam temperature-inclusive.
Wen package filled with the medium as a low boiling point liquid, when the outside temperature, some of vaporization of the liquid as a gas, temperature increase packet size to promote stem off a small valve opening, into the radiator into the reduced water flow, when the outside temperature decreases, some of liquefied gas and a liquid, reducing the temperature package size, increase valve opening thereby increasing the influent flow radiator. The temperature inside the package temperature of a gas-liquid media are often mixed, and the role of time since the advantages of rapid, but the package seal temperature requirement is very stringent, very little in the domestic application.
(2) the liquid temperature-inclusive.
Bag filled with warm temperature of the liquid medium for special, general, such as methanol or toluene. Larger packages such temperature, short time, the current in the wider domestic applications.
(3) solid-state temperature-inclusive.
Wen bag is filled with high expansion coefficient of solids, such as for the paraffin. Because of the relative gas and liquid solid heat (cold) the smaller volume, so its temperature moves slower, but the relative volume of small packet of liquid temperature in the domestic as well as some applications.
(4) metal plate.
Its temperature controllers for temperature device with a special memory metal alloys, the thermal expansion of metal sheets by cold contraction driven valve action. Before the factory such products to its strict temperature devices and testing of the experiment at the same time, as a result of metal in frequent after stretching and bending characteristics, such as the existence of changes in fatigue fracture, and ductile metal with, so will such a sense of temperature devices affect the life and accuracy. Some manufacturers to produce products such valves, rarely seen their foreign products.
2. Thermostatic valve body
Valve body is generally made of copper, nickel appearance, in accordance with its inlet and outlet temperature controller is installed between the valve core can be divided into the following point of view.
(1) straight-through-type valve Valve: inlet and outlet valves for the 180-degree angle.
(2)-angle valve Valve: inlet and outlet valves for the 90-degree angle.
(3) three-dimensional valve body (valve three-dimensional): inlet valve, the valve core into the water and a 90-degree angle, similar to X, Y, Z coordinates.
(4) The special combination of valve body: for some new radiator (such as the bathroom radiator, etc.) and some connections (for example, by leaps and bounds in single-tube), many manufacturers also introduced a number of special temperature-controlled modular valve body. Not in this list.
Products abroad, the water regulating valve resistance value tends to be used Kv said a lot of Chinese-made products are used valve Kv value labeled water resistance characteristics. Kv value is defined as the regulating valve in the valve before the valve after the pressure drop for 1bar through the flow control valve. Kvs value of said regulating valve opening when the largest value of Kv. The following formula can be converted to Kv value commonly used in the local drag coefficient.
Second, the radiator valve radiator system in a variety of the proper use of
1. In our country most of the old radiator heating system is used in vertical up and down through the single-tube or twin-tube system.
(1) in the vertical single-pipe system, radiator water, the former group all through the next set of radiators, each radiator and is located in a different floor, radiator thermostatic valve can not be installed. Could be considered for such a system of vertical single-pipe system, so that the radiator can be installed in each valve or adjust the properties of a good manual control valve.
(2) in the vertical double-pipe system, due to the existence of vertical imbalance in the system can be installed with pre-setting function of the radiator valves. That is, the so-called pre-set features on the valve body with a pre-set the initial resistance of the device, the device will be available through the initial resistance valve settings, different floors of the initial resistance between the different settings can be certain solve the problem of vertical imbalance. However, this method to be used in practice do the following. Designers to do more detailed hydraulic calculation. Installation, construction has to carefully than on the provision of water supply manufacturers resistance flow chart will be accurate thermostatic valve to pre-set position. After running in the water, can be carried out in accordance with the specific circumstances of individual adjustments. Two-pipe system as a result of the high-resistance valve (after the details of the text will do), at the same time pre-set regulator further reduces the valve opening, so a higher quality of the heating requirements, otherwise easily cause obstruction.
2. In recent years, with household heat metering technology continues to develop, in the majority of the civil and industrial construction in the level of indoor household heating systems based ring was broad applications, is also designed with a maximum of kinds of indoor heating arrangement. Heating radiator layout is divided into levels: the level of single-type pipe (not allowed in the standard, non-recommended), the level of single-tube by leaps and bounds, on a twin-tube fraction, fraction of a twin-tube, radiation dual - tube a few major categories.
(1) the level of single-pipe type: horizontal single-pipe system with the earlier single-pipe vertical systems are similar, the heating water flowing through the radiator before a group of the next group after the full flow of cooling , and therefore should not be installed on each radiator valves or manual valves. This valve system is installed, consideration may be given in the first group of the front radiator inlet valve installed in the vicinity of Far, Far EasTone will valve temperature control sensors to be placed in the main room, such as master bedroom, living room . The drawbacks of this arrangement is to move through the valve, will lead to heating the entire room changes in water flow, and valve signal acquisition is only room for one of the signal, then there will be other room temperature fluctuations and precision can not be effective regulation. In this way could also be considered in the first group to install high-quality front-end radiator, opening with the linear relationship between flow control valve manually through the control valve regulating the system of rough. Radiator arrangement such as "standards" are not allowed, we do not recommend using this approach.
(2) the level of single-tube by leaps and bounds: the level of single-tube by leaps and bounds in recent years the application of a more interior arrangement has the merit of each radiator can be accurate for temperature control, adapted to the user's personalized home requirements, but also in line with the "household metering, sub-room temperature" of the policy requirements. At the same time as some high-temperature hot water (not through the radiator heat exchanger) flows to the next group of radiators, the next group to raise the water temperature of the radiator to ensure the quality of the heating.
Compared with other household level for the indoor ring arrangement, by leaps and bounds in single-tube is a relatively simple to adapt to a wide range of layout. In specific applications, according to the use of a variety of valve products (hand control valve) and its applications are many different forms.
In this way a relatively simple structure, low cost. However, in practical applications, there are some problems. Many of its projects, because of indiscriminate use of high resistance of the two-valve, causing the volume of hot water into the radiator is too small. Some works, some of the wrong usage, in order to meet the needs of the radiator into the water, across the tube had to install a regulator valve to increase the resistance across the tube part. Even with the low resistance to the two pass radiator valves should also factor into the calculation of flow. Radiator inlet channel coefficient is part of the radiator and across the tube part of the ratio of channel resistance. Increase in the level of single-tube across the tube system, generally more than 30%, to ensure the water flow radiator. However, this calculation more complicated.
(2.2) the form of bypass valve
In order to adapt to the indoor levels are one-pipe system plus applications across a number of manufacturers introduced a special kind of bypass valve, the valve to the radiator such access (including valve) and a combination of bypass slip overall, and slip into a bypass resistance adjustable bypass valve. The advantage for simplifying the calculation and installation, as the bypass ratio is adjustable to adapt to a wide range of systems, based on the specific circumstances of a separate regulation.
Such a bypass valve can also be calculated into the flow coefficient of the radiator. In some projects have already been adopted gradually.
(2.3) other special form of valve
Currently on the market there were a lot of new forms of the radiator, in order to meet these new radiator, all kinds of special form of valve products came into being.
(3) the level of the form of twin-tube.
Indoor levels of a twin-tube can also be installed in each water radiator valves, to carry out sub-room temperature control. The use of such arrangement, heating of good quality can be multiple sets of radiator series of different radiator valves regulate the system through the impact of small, but regardless of the fraction or fraction of the level of twin-tube arrangement, the interior more complicated pipeline arrangement, the overall decoration of the room, looking a certain effect.
And vertical layout of such a dual-track system, the greater the resistance due to the end, the system the smaller the volatility of its impact, it should choose the high resistance of the radiator valves.
(4) twin-tube radiation.
Such arrangements have also been known as the "octopus-style" layout, but also the level of belonging to the indoor area of a twin-tube. In the household at the entrance to the installation of a / watershed, and sub / catchment一环讲each device connected to a radiator. The advantage of flexible arrangements, which will help to carry out at room temperature, but more complex arrangement of pipes, cost over the previous several high indoor layout. In such a system should also refer to two-pipe system using high-resistance valve, if the use of reliable manual control valve can be installed in the inlet end of each radiator can be installed in each sub-path / Set Water carrying out centralized control.
In August 2003, the MOC issued a "Circular on the work of the urban heating system reform guidance" clearly stipulates that in the future, new public buildings and town houses, where the use of central heating facilities must be designed, installed splitting with temperature measurement and heating system control functions, and implementation of household energy use metering and charging of the new approach. Into the 21st century, the broad masses of the people on energy saving and thermal comfort of the continually increasing demands from household metering, at room temperature has been the policy of the people. Radiator valves will also be more widely used. However, the valve can not be a simple matter of a loaded, the system uses different forms of what kind of valve or other manual control valve, required careful calculation and products based on insight into the basis of At the same time, the installation and post-testing also should be consistent with good design and manufacturers of communication, in accordance with appropriate adjustments to the specific circumstances in order to achieve full and fair use purposes.
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