Cylinder production line - http://m.cb163.cn in physical chemistry experiments, often used in oxygen, nitrogen, hydrogen, argon and other gases. These gases are generally stored in a dedicated high-pressure gas cylinder. When using the valve so that the gas pressure down to test the required range, again after fine - tune other control valve, the gas input to use the system. The most commonly used valve for the oxygen pressure reducing valve, referred to as the oxygen table.

1 the working principle of the oxygen pressure reducing valve

The high pressure chamber of the oxygen pressure reducing valve is connected with the cylinder, the low-pressure chamber is a gas outlet, and the access system is used. The high pressure gauge shows the pressure of the gas in the cylinder, and the outlet pressure of the low pressure gauge can be controlled by the adjusting screw.

When in use, first open the cylinder switch, and then clockwise rotating low pressure regulator screw table, to compress the main spring and transmission film, spring cushion block and a push rod and open the trap door. Such imported high pressure gas from the high-pressure chamber through the throttle after decompression into the low pressure chamber, and the export led to the work system. Turn adjustment screw to change the valve opening height, thereby regulating the amount of high-pressure gas through the pressure to achieve the required value.

Pressure relief valves are fitted with safety valves. It is to protect the pressure reducing valve and make it safe use of the device, but also the failure of the signal device. If the doormat, valve damage, or due to other reasons, resulting in increased outlet pressure, and exceeds a certain permission value on their own, the safety valve will automatically open the exhaust.

2 oxygen pressure reducing valve using method

2.1 according to the different requirements of the use of oxygen valve has many specifications. Most of the maximum inlet pressure, the minimum inlet pressure is not less than 2.5 times the outlet pressure. Outlet pressure specifications are more generally, the maximum outlet pressure is.

2.2 the installation of pressure relief valve should determine whether the connection specifications with the cylinder and the use of the system of the joint. Using hemispherical cylinder valve and connected by tighten the nut to make the two identical. Therefore, in the use of the two hemispheres should be kept smooth, the rotor pump to ensure good air tightness effect. Can be used before the installation of high-pressure gas blowing dust. When necessary, can also be used as a material such as PTFE gasket.

2.3 oxygen pressure relief valve should be strictly prohibited contact with grease, so as to avoid the occurrence of fire accident.

2.4 when the work is stopped, the relief valve should be put into the net, and then loosen the adjustment screw so as to avoid long-term compressive deformation of elastic components.

2.5 the pressure reducing valve should avoid the impact vibration, can not contact with corrosive substances.

3 other gas pressure relief valves

Some gases, such as nitrogen, air, argon and other permanent gases, can use oxygen pressure relief valve. But there are some gases, such as ammonia and other corrosive gases, you need a special pressure relief valve. Common on the market there are nitrogen, air, hydrogen, ammonia, acetylene, propane, water vapor and other special pressure relief valve.

The use of these pressure reducing valves and matters needing attention and oxygen pressure relief valve is basically the same. However, it should also be noted that: special pressure relief valve is generally not used for other gases. In order to prevent misuse, and some special pressure relief valve and the cylinder using a special connection between the mouth. For example, hydrogen and propane are using left thread, also known as reverse screw, should pay special attention to the installation.

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