Oxygen valve in physical chemistry experiments, frequently must use oxygen, nitrogen, hydrogen, argon gas, such as. These gases are generally stored in special high pressure gas cylinders. When using through that gas pressure reducing valve fell to experiment, and then after other required range control valve fine tuning, make the gas input use system. The most commonly used oxygen valve for oxygen pressure reducing valve, abbreviation oxygen gauge.

A, oxygen valve principle of work

Oxygen valve high-pressure cavities and cylinder connections, low-pressure cavity for gas exports, and to use the system. High-pressure table the over-error of indication for the cylinder storage gas pressure. Low voltage table outlet pressure by adjusting screw control.

When using opened first chief switch, then clockwise low-pressure table pressure adjusting screw, make its compression spring and main transmission film, spring cushion block and plunger and will trap opens. Such imported high pressure gas with high pressure chamber by throttling after decompression low-pressure Chambers, and after entering export to work system. Turning adjusting screw, change the height of the trap door open, which regulates high-pressure gas through quantity and achieve desired pressure value.

Oxygen valves are installed with safety valve. It is to protect the safety valve and make use of the device, also valve failure signal devices. If the trap door mat, trap damage or due to other reasons, lead to the outlet pressure rise above a certain permission by value, the relief valve will automatically open exhaust.

Two, oxygen valve use method

(1) according to the requirements of the use of different oxygen pressure reducing valve, there are many specifications. The highest inlet pressure, mostly for the lowest inlet pressure not less than 2.5 times of the outlet pressure. Outlet pressure and specifications, so is commonly, highest outlet pressure for.

(2) installation should determine the connecting valve specifications and cylinder, and use the system joint fsepg. Valve and cylinders using hemispherical surface connection, rely on the nut drives them perfectly. Therefore, when use should maintain two hemispheres surface is bright and clean to ensure good tightness effect. Before installation hi-pressure gas blowing remove dust. When necessary, usable also ptfe gasket materials etc.

(3) oxygen valve should be strictly contact grease, lest the fire accident.

(4) to stop work shall be put in more air valve net, and loosen adjustment screw lest components elastic deformation and other long.

(5) oxygen valve should be avoid impact, not with vibration corrosive substance phase contact.

Three, other oxygen valve, gas pressure reducing valve

These valve use method and the matters needing attention and oxygen valve are basically the same. But, still should point out: special pressure reducing valve general is not used for other gases. In order to prevent misuse, some special pressure reducing valve and cylinders with special connection between mouth. For example the hydrogen and propane adopts left tooth thread, also called reverse thread, when installation should pay special attention to.