1 in physical chemistry experiments, often use the oxygen, nitrogen, hydrogen, argon and other gases. These gases are generally stored in a dedicated high-pressure cylinder. Used by the gas pressure reducing valve down to the range required for the experiment, and then fine-tune after the other control valve, the gas input to use the system. The most common valve for the oxygen valve, referred to as the oxygen tables. Oxygen valve works.

     2 Some gases, such as nitrogen, air, argon and other permanent gases, oxygen valve can be used. But there are some gases, such as ammonia and other corrosive gases; you need special valve, Common market with nitrogen, air, hydrogen, ammonia, acetylene, propane, water vapor and other special valves.

These valves and precautions use basically the same with the oxygen valve. However, it should be noted: special valve is generally not used for other gases. In order to prevent misuse, some special valves and cylinders use a special connection between the mouths. For example, hydrogen and propane are used thread left teeth, also known as reverse thread, installation should pay special attention.

     3 high-pressure oxygen chambers and the cylinder valve connection, low-pressure chamber for gas export, access to use the system. Table show the value of high-pressure storage of gas pressure within the cylinder. Low tables adjust screw outlet pressure can be controlled.
When you first open the cylinder using the master switch, then turn clockwise low pressure gauge pressure adjustment screw to compress the main spring and transmission film, pad and ejector spring the trap door open. This high-pressure gas imports from high-pressure chamber through the throttle decompression into the low pressure chamber and the exit leading to the work system. Turn the adjusting screw to change the valve opening height, thereby regulating the amount of high-pressure gas through the pressure to achieve the required value.
Valves are equipped with safety valve. It is to protect and make safe use of pressure reducing device, the signal is faulty valve device. If, living doormat, valve damage, or due to other reasons, led to increased exports and more than a certain pressure on their own license value, the exhaust valve opens automatically.
 



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