In the company of the highest quality at the lowest cost of production of goods and services customers through the complete elimination of waste in order to achieve "high quality, low cost, short delivery time" to meet customer needs. "Zero defect quality products to our ultimate goal" A21H threaded valve spring Weiqi, to provide users with a distinguished quality products so that they are satisfied - Everbright Everbright Valve Valve Co., Ltd. Shandong welcome new and old customers call to order ! Opening height: leave the valve in the closed position of the actual lift. Flow area: refers to the valve closure member between the inlet end to the sealing surface of the flow channel cross-sectional area of ??the smallest internal thread A21F spring inching valve, used to calculate the theoretical displacement without any resistance when the impact. Flow channel diameter: diameter of the flow channel is applied to the area. Valve Co., Ltd. Shandong Everbright Shandong factory specializing in the production valve valve, welcome new and old customers to order our products! In the company of the highest quality at the lowest cost of production of goods and services customers through the complete elimination of waste in order to achieve "high quality, low cost, short delivery time" to meet customer needs. "Zero defect quality products to our ultimate goal," to provide users with a distinguished so satisfied with the quality of their products - Shandong Everbright Everbright Valve Valve Co., Ltd. welcome new and old customers call to order! A21F threaded valve spring Weiqi, 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.