The function and structure theory of oxygen by the pneumatic valve

the role of oxygen by the pneumatic valve:
oxygen by the pneumatic valve in the physical chemistry experiments, often should use oxygen, nitrogen, hydrogen and argon gas, etc. These gases are generally stored in a dedicated high-pressure gas. When used by reduced pressure pneumatic valve gas pressure drop to experiment the required range, after other fine tuning control pneumatic valve, make the gas input using the system.
the structure principle of oxygen by the pneumatic valve:
oxygen by the pneumatic valve belong to mandatory sealed pneumatic valve, in pneumatic valve is closed, so must to pressure pneumatic disc, to force a sealing surface does not leak. When medium by pneumatic disc below 6 into the pneumatic valve, operating force required to overcome resistance, is pneumatic stem and packing of the friction force and the thrust produced by medium pressure, close the pneumatic valve force than the pneumatic valves open force is big, so the larger the diameter of the pneumatic valve stem, or pneumatic stem top bending failure happens. In recent years, from the seal of the pneumatic valve, pneumatic valve flange deadline is replaced by pneumatic disc above the medium flow direction into the pneumatic valve cavity, in the medium pressure at this moment, close the pneumatic valve is small, the force and the great strength of pneumatic valve, pneumatic valve stem diameter can be reduced accordingly. At the same time, in the role of media, this kind of pneumatic valve is tight. Pneumatic valve in China 'three for' regulation, by the flow of the pneumatic valve shall be applied.