A21F, A21H-C type spring Weiqi threaded safety valve for air temperature equipment or piping, ammonia, liquefied petroleum gas and other media ...... ≤200 ℃ for. A21W-P, R type spring Weiqi threaded valve for temperature ≤200 ℃ corrosive gas or liquid equipment or pipeline A21H threaded valve spring Weiqi, as the overpressure protection device. KA21Y type spring Weiqi threaded valve for temperature ≤100 ℃ liquefied petroleum gas. Threaded valve spring Weiqi main parts material safety valve is opening and closing pieces by the external force is normally closed state A21F threaded valve spring Weiqi, exceeds a predetermined value when the media pressure equipment or pipeline rises safety valve, through the media outside of the system to prevent the special valve discharge piping or equipment within the medium pressure exceeds a predetermined value. Safety valves are automatic valves, mainly for boilers, pressure vessels and piping, control pressure does not exceed the value of personal safety and equipment operation plays an important protective role. A21F, A21H-C type spring Weiqi threaded safety valve for air temperature equipment or piping, ammonia, liquefied petroleum gas and other media ...... ≤200 ℃ for. A21W-P, R type spring Weiqi threaded safety valve for equipment or pipeline temperature ≤200 ℃ corrosive gas or liquid, as the overpressure protection device. KA21Y type spring Weiqi threaded valve for temperature ≤100 ℃ liquefied petroleum gas. The main parts of the material threaded valve spring Weiqi A21H springs within inching valve, Everbright valve model, safety is provided by Shandong China Everbright Limited valve. Valve Co., Ltd. Shandong China Everbright (www.sdgdfm.com) Shandong Weifang, ball leader, over the years, the company is implementing 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.