Weifang valves, valve Everbright (certified), the safety valve provided by Shandong China Everbright Limited valve. Valve Co., Ltd. Shandong China Everbright (www.sdgdfm.com) is specialized in the "valve" of the enterprise, the company of "honesty, hard service" concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Manager Ma. 2013 Weifang valve valve industry market scale, this is an indisputable fact. The number of safety valves can produce qualified enterprise is not much, because the safety valve is part of the special equipment industry, the State Administration of Quality Supervision review of the application of more stringent qualification A21H-C type safety valve, safety valve and the huge market demand A21F spring Weiqi safety valve internal thread, no doubt to the relief valve qualified production companies to bring more wealth opportunities. Curtain area: When cylindrical-shaped or conical surface area of ??the disc-shaped channel at the top of the seat between the sealing surface of the formation. Discharge area: minimum cross-sectional area of ??the valve discharge fluid channel. For the full revelation safety valve, the discharge area is equal to the flow area; for inching valve discharge area equal to the area of ??the curtain. Valve Co., Ltd. Shandong Everbright valve manufacturer specializing in the production, welcome new and old customers to order our products!