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, as the valve opening and closing the information in the central operations room simulations performed on the dashboard display. 2.1 standard pneumatic valve body material quality, temperature and pressure valves shall be ductile iron, cast 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, 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 immersed in water conditions and valve body is not the formation of electrochemical corrosion. Valve shaft packing ① As the pipe network in the pneumatic valve valve is usually open and close infrequent high temperature and pressure valve manufacturers, requiring the filling in a few years of inactivity, not aging filler stainless steel valves, long-term effects remain sealed; ② fill valve shaft also should bear the frequent opening and closing, the good sealing effect; ③ In view of the above requirements, fill valve shaft does not seek to change or 10 years for life without replacement; ④ Packing For replacement, pneumatic valves should be designed to have water pressure conditions Measures under the replacement. Steel valve manufacturer | valve | Valve Co., Ltd. Shandong by Shandong Everbright Everbright valve. 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.