Back seat pressure: After contact with the discharge valve seat again, that 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! Displacement Theory: equal flow path cross-sectional area and flow area valve ideal nozzle displacement calculation. Displacement factor: the actual and theoretical displacement displacement ratio. Rated discharge coefficient: discharge coefficient and reduce the coefficient (0.9) of the product. Valve Co., Ltd. Shandong Everbright A21F manufacturer specializing in the production valve spring Weiqi threaded valve, welcome new and old customers to order our products! 2013 valve industry market scale, this is an indisputable fact. Our safety valve can produce the number of qualified companies are not many A21H threaded valve spring Weiqi, because the safety valve is part of the special equipment industry, the State Administration of Quality Supervision review of the application of more stringent qualifications, and a huge demand for the safety valve market, no doubt to the relief valve qualified production companies to bring more wealth opportunities. Weifang valves, valve model Everbright, safety valve 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.