Structural features a pneumatic valve, this valve consists of body, valve cover, gate, stem, seals, double cylinder and piston rod, partitions along with buffering mechanism, manual, pneumatic - manual conversion device and part of the valve cover packing devices. 2, the upper end of the piston stroke to be the top line on the back to the hearing so that the sender; the lower end of the lower piston stroke line information is available under the top next time, so that the sender, as the valve opening and closing information in a central operations room simulations performed on the dashboard display. Pneumatic valve performance testing valve of a standard volume manufacturing Z641F pneumatic valve price, should be entrusted to an authoritative organization for testing the performance of the following: ① valve pressure in the working conditions of the opening and closing torque; ② pressure in the working conditions, to ensure that the valve closed tight continuous opening and closing times; detecting flow resistance coefficient ③ valve in the pipe-borne water conditions. Valve at the factory should be detected following: ① valve in the open position, the valve shall be subjected to internal pressure valve working pressure values ??detected twice; ② the closed condition of the valve, both sides were to withstand 1.1 times the working pressure valve value, no leakage; but the metal sealing butterfly valve, leakage is no greater than the relevant requirements. 2.1 quality standard pneumatic valves valve body material should be ductile iron Z641F pneumatic valve manufacturers, steel, stainless steel, 316L-based, and indicate the grade and cast actual physical and chemical test data. 2.2 stem material, and strive to stainless steel stem (2CR13) Z641F offer pneumatic valve, large diameter valves also should be embedded in the package of stainless steel stem. 2.3 nut material, cast brass or aluminum bronze, and the hardness and strength are greater than the stem. 2.4 stem bushing material, its hardness and strength shall be not greater than the stem, and is immersed in water conditions and valve body is not the formation of electrochemical corrosion. Z641F pneumatic valve manufacturers | Gate | Gate Valve Co., Ltd., China Everbright Everbright provided by Shandong valve. Valve Co., Ltd. Shandong China Everbright (www.sdgdfm.com) strong, credible, Shandong Weifang ball industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Everbright valve into the brilliant and you work for a better future!