Safety valve opening and closing pieces by the external force is normally closed state steel valve type, when the device or media pressure rises inside the pipe steel valve exceeds a predetermined value, through to the outside of the system to prevent the pipeline discharge medium or device media special valves pressure exceeds a predetermined value. Safety valves are automatic valves, mainly used in boilers, pressure vessels and piping, control pressure does not exceed a predetermined value steel valve supplier of personal safety and equipment operation plays an important protective role. A21F, A21H-C type spring inching threaded safety valve for temperature equipment or pipeline air, ammonia, liquefied petroleum gas and other media ...... ≤200 ℃ of. A21W-P, R type spring Weiqi safety valve for internal threads equipment or pipeline temperature ≤200 ℃ corrosive gas or liquid, as the overpressure protection device. KA21Y type spring inching threaded valve for temperature ≤100 ℃ liquefied petroleum gas. Threaded valve spring Weiqi material pressure back seat main components: the discharge valve again after contact with the valve seat, that is opening height becomes zero in inlet pressure. Blowdown: opening pressure and differential pressure of the back seat, usually expressed as a percentage of the back seat pressure and opening pressure only when using the pressure difference between the two to represent the low opening pressure. Shandong Everbright Valve Co., Ltd. specializing in the production valve manufacturers, welcomed the new and old customers to order our products! Steel valve manufacturer, China Everbright valve (certified), cast steel Valve Co., Ltd. by Shandong Everbright valve. Shandong Everbright Valve Co., Ltd. (www.sdgdfm.com) Shandong Weifang, ball leader, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Everbright valve leadership with the staff warmly welcome all inquiries negotiations to create a better future for China Everbright valve.