Working principle of the pneumatic valve and open closed

The role of the valve is a liquid or gas entrapment, make it can't pass freely. USES different different kinds of valve, pneumatic valve is a kind of widely used in aviation kerosene, natural gas, liquefied gas, pipeline gas, such as a valve in the pipeline. Next, we understand the working principle of the pneumatic valve in detail in the future. Working principle of the pneumatic valve: pun double break and relief valve working principle of the key is installed on the cock of the two pieces of sealed sliding vane. Working principle of the pneumatic valve can also be divided into several parts, detailed as follows: the closed valve: the valve is closed, to rotate the handwheel, cock and sealed sliding vane rotary °, and then the cock moves down, as the cock of the movement to promote sealed sliding vane to the valve body cavity cover until the elastic sealing ring are evenly squeeze the valve hole up and down side, form a seal. Open valve: the valve opens, by rotating the handwheel to lift plug, on both sides will be sealed sliding vane from the body back. When the sliding vane completely withdraw from the valve sealing surface, keep turning the handwheel, make cock and sealed sliding vane rotary °, the valve is in open position. About seal: elastic sealing ring is moulded in the groove, the sliding vane with sealed sliding vane to the valve to move the import and export, the sealing circle also gradually is pressed into the grooves after machining of vane surface and the valve body cavity formed secondary gold to metal seal prevent elastic seal circle continue to pressure, with fire prevention function. Pun double break and discharge: this is a kind of through the two cut-off valve and a relief valve in between them to achieve complete partition on both ends of pipeline, the method of closed two main valve open relief valve can improve the system security. If the first valve leakage, leakage from medium can be derived by open the discharge valve. Double seal method: two separate sealed sliding vane in the valve hole pressure (up and down Pun intended) When the valve is closed, relief valve is opened, inspection seal ( Discharge) 。