Back seat pressure: After the discharge valve to re-engage the valve seat, Shandong, namely opening height becomes zero the inlet pressure. Blowdown: opening pressure and differential pressure of the back seat, usually expressed in percentage of the back seat pressure and opening pressure, and only when using the pressure difference between the two to represent the opening pressure is low. Valve Co., Ltd. Shandong Everbright valve manufacturer specializing in the production, 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! Nominal pressure: that the safety valve at the highest allowable under normal temperature with pressure, high-temperature equipment used in high temperature material safety valve should not be considered to reduce the allowable stresses. Safety valve is based on the nominal standard design and manufacture. Opening pressure: Also called the rated pressure or tuning pressure A21H spring Weiqi threaded safety valve, pressure relief valve means imported valve under operating conditions began to rise when, under the pressure valve manufacturers, began to opening height measured by state media showed a continuous emission visual or auditory perception. 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 manufacturers Everbright Everbright provided by 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!