In physical chemistry experiments, often use the oxygen, nitrogen, hydrogen, argon and other gases. These gases are generally stored in a dedicated high-pressure gas cylinders in the. When used through the valve so that gas pressure down to test the required range, and then fine-tuning through the other control valves, so that gas entered the system. The most commonly used valve for the oxygen valve, referred to as oxygen table.
1. Oxygen valve works
Oxygen valve look and work.
The high-pressure oxygen chamber and the cylinder valve connected to low-pressure chamber for gas exports and access to use the system. Table showing the value of high-pressure storage of gas cylinder pressure. Low table outlet pressure adjustment screw can be controlled.
When you first open the cylinder using the master switch, and then the table clockwise rotating low pressure regulator screw to compress the main spring and the transmission film, spring pads, and push-rod and open the trap door. This high-pressure gas imports from the high-pressure chamber through the throttle after decompression into the low-pressure chamber, and the exit leading to the working system. Turn adjustment screw to change the valve opening height, thus regulating the passage of high-pressure gases to achieve the required amount of pressure value.
Valves are equipped with safety valve. It is to protect the valve and make the safe use of the device, is also a valve failure signal device. If, living doormat, valve damage, or due to other reasons, resulting in increased outlet pressure, and exceeds a certain permission on their own value, the valve will automatically open the exhaust.
2. Oxygen valve to use
(1) according to the different application requirements, oxygen valve has many specifications. The maximum inlet pressure the most part, the minimum inlet pressure of not less than 2.5 times the outlet pressure. Outlet pressure specification more, generally, the maximum outlet pressure of.
(2) The installation of pressure reducing valve should be connected to determine whether the cylinder and the use of standard connector systems are consistent. Valve and the cylinder with hemispherical connections, tighten nut to rely on the two fit together well. Therefore, the use of the two hemispheres should be to maintain the smooth surface in order to ensure good gas-tight effect. Before installation can be high-pressure gas blowing addition to dust. When necessary, can also be used to make Teflon and other materials, gasket.
(3) The oxygen valve should be forbidden contact with grease, so as to avoid fire accidents.
(4) stop working when the valve should be placed in a net residual gas, and then loosen the adjustment screw so as to avoid long-term compressive deformation of elastic components.
(5) The valve should be avoided shock vibration, can not be in contact with corrosive substances.
3. Other wear-resistant electrode gas valve
Some gases, such as nitrogen, air, argon gas and other permanent gases, oxygen valve can be used. But there are a number of gases such as ammonia and other corrosive gases, you need special valve. Common market are nitrogen, air, hydrogen, ammonia, acetylene, propane, water vapor and other special valves.
The use of these valve methods and precautions with the oxygen valve basically the same. However, it should be noted: Private valve is generally not used for other gases. In order to prevent misuse, and some special valves and the cylinder using a special connection between the mouth. For example, hydrogen and propane are used thread left teeth, also known as reverse-threaded, the installation should be special attention.
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