When the pressure is double spring safety valve device exceeds a specified operating pressure and meet safety valve opening pressure, the internal role of the media in trouble flap above loading mechanism force is greater than the force exerted on it, and then leave the valve seat safety valve open, the media inside the device is discharged through the seat, if the displacement of more than a safety valve safety discharge device, the pressure inside the device that is gradually decreased, but after a short time by exhaust pressure drop that back to normal working pressure. Pressure within this time to turn the valve on top of the force is less than the force applied to the loading mechanism on top of it, they pressed the valve seat and the media to stop the discharge, equipment to maintain normal operating pressure continues to run. Therefore, the safety valve is a force on the valve through the medium of growth and decline of the force and the loading mechanism, or turn itself off in order to achieve the purpose of preventing overpressure device. If the back-pressure valve outlet selection principle is the safety valve change, when the change of more than 10% of the opening pressure should be used bellows valve; if the medium is corrosive and should be used bellows safety valve prevents vital parts due The failure by the media corrosion. Valve at the outlet should be no resistance, to avoid pressure phenomenon. Before installing the valve should be specifically tested Weifang valve and check its official seal. For use in safety valve should be checked regularly. For having upper and lower adjustment ring (on the guide sleeve and have a seat adjustment ring) structure, the adjustment to be complicated. Seat adjustment ring is used to change the size of the ring between the valve and adjust the channel, thereby changing the initial valve opening pressure between the valve and the extent of the adjustment ring accumulation chamber size. When elevated seat adjustment ring, the degree of pressure build-up increases, so that the valve opening ratio stage decreases rapidly to a sudden sharp turn. Therefore, increased discharge pressure valve seat adjustment ring can be reduced. It should be noted that Shandong A38Y16C valve seat adjustment ring should not rise too close to the valve. As leak sealing surface of the valve can lead to premature sudden turn, but because this time the media pressure is not enough to keep the valve in the open position, the valve was then closed Shandong valve, so the valve occurrence frequency hopping. Seat Pitch: "ring main valve to reduce the proportion of stage and adjust the discharge pressure to open, but also have an impact on the pressure back seat. Shandong valve | safety valve | valve model provided by Everbright Everbright Valve Co., Ltd., Shandong. Valve Co., Ltd. Shandong China Everbright (www.sdgdfm.com) strong, credible, Shandong Weifang ball industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Everbright valve into the brilliant and you work for a better future!