The structure of precision pressure reducing valve and how to use it correctly

The body of precision pressure reducing valve is made of brass. The structure of two-stage decompression is basically similar to that of single-stage decompression, which is composed of valve ejector, pressure regulating spring, elastic membrane device, decompression door and other parts. The first stage decompression system is mainly used to automatically reduce the high pressure gas to the medium pressure gas, and then send it to the second stage decompression system. In the secondary pressure reducing system, when the pressure regulating screw is screwed, the pressure regulating spring, the elastic membrane device and the valve ejector are used to open and close the pressure reducing valve in different degrees, so as to adjust the pressure reducing degree of the oxygen supplied by the pressure reducing system or stop the gas supply.

The thread size of the inlet joint of the precision pressure reducing valve is 23.4mm, the inner hole size of the joint is 7mm, the inner diameter of the outlet joint is 4.8mm, and the large flow rate is 40m3 / h. A high pressure oxygen meter and a low pressure oxygen meter are installed on the pressure reducing valve body to indicate the pressure in the high pressure gas chamber (i.e. in the oxygen cylinder) and the low pressure gas chamber (i.e. working pressure).

When the precise pressure reducing valve is used, when the adjusting screw is turned clockwise, the pressure reducing valve can be opened, and the high-pressure oxygen will flow into the low-pressure chamber from the gap. Because of the expansion of oxygen volume in the low pressure chamber, the pressure is reduced, which is called decompression. When opening the precision pressure reducing valve, the action is slow. If the opening speed of the valve is too fast, the temperature of the gas in the working part of the pressure reducing valve will be greatly increased due to the adiabatic compression, which may cause the parts made of organic materials, such as rubber packing and rubber film fiber gasket, to burn out, and the pressure reducing valve will be completely burnt out. In addition, due to the electrostatic spark generated by too fast venting and oil stain on the pressure reducing valve, it will also cause fire and burn the parts of the pressure reducing valve.