Opening height: leave closed valve position actual lift. Flow area: refers to the valve closure member between the inlet end to the sealing surface of the smallest cross-sectional area of ??the flow path, used to calculate the theoretical flow without any resistance on time. Flow channel diameter: diameter of the applied flow area. Shandong Everbright Valve Co., Ltd. specializing in the production valve manufacturers, welcomed the new and old customers to order our products! A21F, A21H-C type spring inching valve internal thread dimensions and connecting dimensions Valve Co., Ltd. is located in Shandong, China Everbright International Kite Capital Cravens District Weifang, Jinan-Qingdao, Lai Wei-speed, Jinan Railway running through the urban area, transportation is very convenient. Companies specializing in the production of valve manufacturers Weifang valve, welcomed the new and old customers call to order our products! Safety valve is a valve family special branch valve, safety valve because of its particularity is different from the other valves only acts as a switch, more importantly protect the safety of the device. With the rapid development of China's economic construction, the project works with a pressure control equipment is increasing. Shandong Everbright Valve Co., Ltd. specializing in the production valve manufacturers, welcomed the new and old customers to order our products! Valve Manufacturers | Shandong Everbright valves | valve provided by Valve Co., Ltd. Shandong China Everbright. Valve Manufacturers | Shandong Everbright valves | valve Valve Co., Ltd. Shandong China Everbright (www.sdgdfm.com) this year introduced a new upgrade, the above picture is for reference only, please call the telephone or pictures on this page, for the latest information Contact: Manager Ma.