2.1 standard pneumatic valve body material quality, should be ductile iron, 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), large diameter valves should also be embedded in the package of stainless steel stem. 2.3 nut material, cast brass or cast bronze Weifang valve, and the hardness and strength are greater than the stem. 2.4 Z641F pneumatic valve stem bushing material vendors, 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. Moving the valve operating mechanism 4.1 operating pneumatic valves opening and closing direction, and all should be clockwise closing. 4.2 As the pipe network in the pneumatic valve, often manually opening and closing, opening and closing rotation should not be too much, that is, large diameter valves should be transferred within the 200-600. 4.3 In order to facilitate opening and closing operation of a person under the plumber pressure conditions, the maximum torque should open and close 240N-m. 4.4 pneumatic valve opening and closing operation should end mortise and tenon pneumatic valve, and the size standard, and facing the ground, so that people can be directly operated from the ground. With a wheel valve does not apply to underground pipe network. 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. Z641F pneumatic valve Sellers | Everbright valve manufacturer (certified) | pneumatic 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.