The principle of pneumatic cut-off valve and installation steps

Pneumatic cut-off valve which is driven by compressed air valve, using a remote control. Main control room manual or automatic trigger action command to activate for power supply of air intake and exhaust solenoid valve actuators. Discharge of compressed air. Compressed air role on the piston or diaphragm, in order to overcome the operation of friction and stem of elasticity, thus pushing down ( If there is an air loss, open the valve) Or lift ( In the event of loss of air, valve) 。 By closing) Move up and down, the valve core, so as to open and close the valve. Lose air valve and driver in the head no compressed air, depending on the system requirements, the valve will be in the safety of the fully open or fully closed position. Compressed air for power plant instrument, supply pressure is usually - bar。 Before entering the valve, compressed air through the filter filtration and purification in the first place, and then through the pressure reducing valve for pressure relief. The entrance pressure gauge reading is less than the bar. Decompression can adjust the installation in the upper part of the relief valve adjusting screw to adjust. Before the adjustment must loosen the protection cover. Pneumatic cut-off valve installation steps: pneumatic globe valves are normally used for closed and fully open uniflow pipe to gases and liquids. It is more long than gate valves with structure and shorter length. If the media has a strong corrosive, please choose the entry and exit lower cut-off valve. If the medium under high pressure and often open or closed, the valve stem shall be upset, to prevent stem bending due to the thrust of medium. In use process, please pay attention to air pressure, the valve stem pressure and resistance to corrosion problems, because of pneumatic cut-off valve flow resistance is higher than other valves. Pneumatic cut-off valve is not suitable for granular, viscosity and coking of the medium.