2.1 quality standard pneumatic valves Body material shall 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, brass or aluminum bronze cast Weifang valve, and the hardness and strength are greater than the stem. 2.4 valve stem bushing material, its hardness and strength shall be not greater than the stem, and immersed in water conditions and valve body is not the formation of electrochemical corrosion. Pneumatic valve structural features 1, the valve consists of body, valve cover, gate, stem, seals, double cylinder and piston rod, partitions along with buffering mechanism, manual, pneumatic - manual conversion means and part of the bonnet packing devices. 2, the upper end of the piston stroke of the line to be on top of the back to the hearing so that the sender; the lower end of the piston stroke can be the top row to the hearing at the next time, so that the sender Shandong valve, as the valve opening and closing information center operating room display analog dashboard. Only clear specifications, type, working pressure of pneumatic valve procurement practices to meet the procurement requirements in the current economic environment, market is imperfect. Because the pneumatic valve manufacturers under in order to compete in the high temperature and pressure valves, pneumatic valves each have a unified design concept, with different innovations, formed their own company standards and product personality. Therefore, when the pneumatic valve procurement more detailed technical requirements, coordinating with manufacturers to reach a consensus, as an annex to the pneumatic valve procurement contract is necessary. Shandong Everbright valve (Figure), valve type, valve by valve Shandong China Everbright Limited. Shandong Everbright Valve Co., Ltd. (www.sdgdfm.com) located in Weifang City, Shandong Province, Cravens District Bao Tong Street North Makers Industrial Park. Scraps and development in the wave of market economy, the current Everbright valve has a high profile in the ball, and enjoys a good reputation. Everbright valve made whole network business alliance certification, marking our service and management level has reached a new height. Everbright valve staff willing to work with all people of insight and common development, for a better future.