Valve types and uses

Valve is closed parts (ram) along the channel center line perpendicular to the direction of movement of the valve. Valve in the pipeline used mainly for cutting.



     Valve is to use a valve very broad, general diameter DN ≥ 50mm cut-off devices are selected it, and sometimes cut off a small-caliber devices also use valve, the valve has the following advantages:



     ① fluid resistance.

     A smaller external force required to open and close ②.

     ③ medium flow unrestricted.

     ④ full-time, the sealing surface of the erosion by the working fluid valve smaller than the cut-off.

     ⑤ relatively simple shape, casting process is better.



     Valve also has shortcomings:



     ① Overall size and height of a larger opening. Large space required for installation.

     ② opening and closing process, the sealing surface friction between the relatively easy to cause abrasions.

     ③ valve normally have two sealing surface, to the processing, polishing and maintenance of the increased number of difficulties.



     First, the type of valve



     1. Construction of divisible by ram



     1) Parallel Gate Valve: sealing surface and vertical axis parallel to the two valve sealing surface parallel to each other.



     In a parallel-type valve in order to wedge-thrust structure with the most common is common, both in the middle of two double-sided thrust wedge gate, which applies to low-voltage small-caliber valve (DN40-300mm) valve. Also have two rooms with a spring damper, spring can produce to the tight power is conducive to ram seal.



     2) Wedge Gate Valve: sealing surface and the vertical axis into a certain point of view, that is, two sealing surface into a wedge-shaped valve.



     Sealing surface of the tilt angle are generally 2 ° 52 ', 3 ° 30', 5 °, 8 °, 10 °, etc. The size of the angle depends primarily on medium high and low temperature. Generally higher operating temperature, the angle taken to be larger in order to reduce the temperature change occurs when the wedge housing possibilities.



     In the wedge-type gate valve, a further single gate, Shuangzha divided board and elastic damper. Single wedge gate valve, simple structure, the use of *, but the sealing surface angle of the higher accuracy requirements, processing and maintenance more difficult, the temperature change is very likely to live wedge. Shuangzha plate wedge gate valve in the water and steam pipes in the media to use more. Its advantages are: the angle of the sealing surface precision low temperature is not easy to live a phenomenon caused by wedge, sealing surface wear, you can add pads compensation. However, this structural components are more easily bonded in the viscous medium, affecting sealing. More important is the upper and lower baffle long-term use is easy to produce rust, gate easily. Flexible wedge gate valve, it has a single wedge gate valve structure is simple, using * the merits, but also produce small amounts of elastic deformation of the cover sealing surface angle deviations arising during processing and improve the technics now been widely adopted. 

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