Back seat pressure: After the discharge valve to re-engage the valve seat Weifang, namely opening height becomes zero the inlet pressure. Blowdown: opening pressure and differential pressure of the safety valve back seat, usually a percentage of the valve opening pressure of the manufacturers represented by the pressure back seat only when the pressure difference between the two when using low opening pressure to represent. Valve Co., Ltd. Shandong Everbright A21F manufacturer specializing in the production valve spring Weiqi threaded valve, welcome new and old customers to order our products! Opening height: leave the valve in the closed position of the actual lift. Flow area: refers to the valve closure member between the inlet end to the sealing surface of the flow channel of the smallest cross-sectional area, is used to calculate the theoretical displacement without any resistance when the impact. Flow channel diameter: diameter of the flow channel is applied to the area. Valve Co., Ltd. Shandong Everbright valve manufacturer specializing in the production, welcome new and old customers to order our products! Weiqi threaded valve springs, valve, valve type Everbright Everbright Limited provided by Shandong valve. 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!