In the physical and chemical experiments, often use the oxygen, nitrogen, hydrogen, argon and other gases. These gases are generally stored in a dedicated high-pressure gas cylinders in. Through the use of gas pressure relief valve so that the necessary scope to experiment, and then, after fine-tune other control valve, so that the use of gas input system. The most commonly used pressure relief valve for the oxygen, or oxygen table.
1. The working principle of the oxygen pressure
The appearance of oxygen and pressure relief valve works.
High-pressure oxygen chamber pressure relief valve connected with the cylinder, low pressure chamber for gas exports, and to use the system. Table showing the value of high-pressure cylinders for the pressure of stored gas. Low table by adjusting the outlet pressure control screw.
Cylinders used to open the master switch, and then clockwise rotating low pressure regulator screw table to compress the main spring and transmission film, pad, and push-rod spring open the trap door. This high-pressure gas imports from high-pressure decompression chamber by cutting into the low pressure chamber, and by the export system to work. Turning adjustment screw to change the height of the trap door open in order to adjust the volume of high-pressure gas through the pressure to achieve the required value.
Are equipped with safety relief valve. It is a relief valve and the protection of the safe use of devices as well as reducing signal device failure. If, as a living doormat, valve damage, or due to other reasons, led to pressure to increase exports and to permit more than a certain value, the safety valve will automatically open the exhaust.
2. Reducing the use of oxygen
(1) according to different application requirements, there are many specifications of oxygen pressure. Imports are for the most part the highest pressure, the minimum inlet pressure of not less than 2.5 times the outlet pressure. Specifications of outlet pressure more generally, the maximum pressure for export.
(2) relief valve should be installed to determine whether the specifications of its connection with the cylinder and use the system in line connector. Relief valve used with the hemispherical cylinder connected by nuts tightened up so that they fully coincide. Therefore, in the use of the two hemispheres should be to maintain the smooth surface to ensure a good airtight effect. Pre-installation of high pressure gas can be used in addition to blowing dust. Can also be used when necessary, such as PTFE gasket materials.
(3) exposure to oxygen grease relief valve should be prohibited in order to avoid fire accidents.
(4) stop working when the relief valve should be put in the net more than gas, and then screw loose screw adjustment so as to avoid long-term pressure on deformation of elastic element.
(5) Reducing the impact of vibration should be avoided, not in contact with corrosive substances.
3. The other gas relief valve
Some gases, such as nitrogen, air, argon and other permanent gases, oxygen pressure relief valve can be used. But there are a number of gases, corrosive gases such as ammonia, etc., you need a dedicated valve. Common market, there are nitrogen, air, hydrogen, ammonia, acetylene, propane, steam and other special relief valve.
Reducing the use of these methods and points for attention with the oxygen valve is basically the same. However, it should be noted: a dedicated pressure relief valve generally not used for other gases. In order to prevent misuse, and some special pressure relief valve and the special connection between the cylinder mouth. For example, hydrogen and propane are used thread left teeth, also known as reverse-threaded, should pay special attention to the installation. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
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