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, 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) Direct-type valve body: and the water inlet valve angle of 180 ° 2)-angle valve Valve: inlet and outlet valve angle of 90 ° 3) three-dimensional valve body (three-dimensional valve): inlet valve, the valve core into the water and 90 ° 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 modular valve Body. Not in this list.
3, valve Kvs value and Kv value
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 local resistance coefficient ξ value.
4, the radiator valve radiator system in a variety of the proper use of
4.1, in the majority of our 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 factory flow chart resistance to valve transfer to accurately pre-set position; in the water running, 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.
4.2, in recent years, household heat metering technology in increasing the level of indoor household heating-loop system for the majority of civil and industrial construction gained widespread application, this system is also designed with a maximum of arrangement of indoor heating. 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 flows through a heat sink before flowing into the next group after the full radiators Therefore, should not be installed on each radiator valves or manual valves. 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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