the purpose is to prevent the backflow medium with a non-return valve. Check valves are normally installed in the pump outlet. In addition, also check valve should be installed in the compressor outlet. In a word, in order to prevent medium counter-current, should be installed in the equipment, or install the check valve in the pipeline. Vertical lift check valves are used for pipelines of the level of nominal diameter of 50 mm. Straight-through lift check valves may be installed in both horizontal and vertical pipes. Bottom valve is usually installed on the vertical pipe pump imported, the medium flows from bottom to top. Swing check valves can work under high pressure, the PN can reach 42 million mpa, DN can also be very big, up to 2000 mm. Depending on the shell and the seal material, can be applied to any working medium and operating temperature range. Medium for water, steam, gas, corrosive medium, such as oil, food, medicine, working temperature range of - of the medium 196～800℃。 Swing check valve installation position is not restricted. Are normally installed in horizontal pipe runs, can also be installed in vertical or inclined pipe runs. Butterfly check valve application is low pressure, large diameter, installation co. , LTD. As a result of the butterfly check valve work pressure is very high, but its nominal diameter can be very big, can reach more than 2000 mm, but its nominal pressure below 6. 4 million mpa. Butterfly check valves may be made a pair of clamp, usually installed in the pipeline between two flanges, takes the form of a pair of clamp connection. Butterfly check valve installation position is not restricted. Can be installed in horizontal pipe, vertical pipe or tilted line. Diaphragm valve is suitable for common water hammer pipe. The diaphragm can eliminate reverse flow medium caused by water hammer. Due to the working temperature of diaphragm valve and pressure is limited by diaphragm material, so the diaphragm valve is typically used for low pressure and room temperature pipes, especially the water pipe. Working temperature is in commonly - medium Between 20 ~ 120 ℃, the working pressure is less than 1. 6 million mpa, but larger diameter diaphragm type check valve can be realized, the biggest DN can be more than 2000 mm. Diaphragm type check valve with its excellent waterproof performance, simple structure, low manufacture cost and has widely application. Ball check valve has good sealing performance, reliable running performance and water resistance, because the seal is rubber coated sphere; Due to the seal can be a single ball and the ball, so can be made into large diameter check valve. But its sealing ring is coated with rubber hollow sphere. Do not apply to the high pressure pipeline, applies only to the low pressure pipeline. Ball check valve shell material can adopt stainless steel, the sealing of the hollow spheres can be coated ptfe engineering plastics, can also be used for general corrosion medium in the pipeline. The working temperature of the check valves in - From 101 to 150 degrees Celsius, the nominal pressure is less than 4. 0 million mpa, the nominal diameter is between 200 ~ 1200 mm.

In the office, various are considered essential since they are used to achieve particular tasks in the office. Among these , flow control valve, os&y gate valve, and os gate valve are widely used.
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