How to choose the gas pneumatic valve material

gas pneumatic valve pneumatic valve body material is very important, the material is unqualified, will cause the pneumatic valve and seal leakage or leakage; The comprehensive performance of mechanical parts, the degree of strength and stiffness can meet use requirement and even rupture. Lead to an explosion caused by leaking gas medium. Therefore, in the development, design, development of natural gas in the process of pneumatic valves, material is the most critical problem.
to understand the development direction of zigong pneumatic valve in the gas industry ( Decision-making development, the development of specific products) To see natural gas, from the economic and practical application of pneumatic valves:
) Give priority to in order to fully open full close, mainly adopts pneumatic brake pneumatic valve, butterfly valve and the ball valve. The pneumatic valve disc brakes are flexible, and there is pressure drain hole, so, the export side, from the pneumatic valve increases with increased pressure, leakage ( It is also a day for air brake pneumatic valve destiny) , but the natural gas high pressure system ( Lb) Generally use pneumatic valve, pneumatic butterfly valve gate. Because of increasing usage, users are familiar with, to eliminate the early use of insecurity. But butterfly pneumatic valve can only be used in low pressure systems ( Lb) The pipeline. Pneumatic ball valve, due to the short operation time, small resistance of medium, commonly used in the effective use of its advantages of normal temperature on the pipeline system.
） To adjust the flow rate is given priority to, mainly is the butterfly pneumatic valve, globe pneumatic valve and needle valve. In general, pneumatic valve industry in sichuan province in the large diameter and low pressure natural gas pipeline, often use pneumatic valve and globe pneumatic butterfly valve, easy to operate, suitable for small diameter pipe road, but the pneumatic valve before and after the pressure difference is big. Pneumatic valve, needle in tiny flow control needs to be done under the condition of use.
） In order to prevent the reverse flow is given priority to, mainly adopts pneumatic valve in sichuan province. Usually nominal diameter < DNmm, use the aerodynamic lift check valve; Nominal diameter > DNmm, use swing check pneumatic valve; In a large diameter pipe, using special door type check pneumatic valve separately. Gas pneumatic valve, in many cases are allowed to work at medium temperature do not break strength of the general structure, but it must require the use of those who work in the medium temperature strength characteristics of materials required to make.