Safety valve opening and closing pieces by the external force is normally closed state, when the media pressure equipment or piping inside rises above a predetermined value, through the media outside of the system to prevent special valve discharge pipe or equipment exceeds the value of the medium pressure . Safety valves are automatic valves A21F threaded valve spring Weiqi, mainly used for boilers, pressure vessels and piping Weifang valves, control pressure does not exceed the value of personal safety and equipment operation plays an important protective role. 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 valve manufacturers, pressure relief valve means imported under operating conditions began to rise when, in the pressure began to have measurable opening height, medium was by visual or auditory Continuous Emission status perception. Valve Co., Ltd. Shandong Everbright valve manufacturer specializing in the production, welcome new and old customers to order our products! A21F-type safety valves, safety valves, 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!