Pneumatic valve is a device in the factory instructions shall indicate the following data: Valve specifications; models; working pressure; manufacturing standards; Body material; Stem material; sealing material; a valve shaft packing material; stem bushing material; and external corrosion Material; Operation Starting direction; closing pressure in the working condition of torque;; revolutions factory Make; release date; serial number; weight; connecting flange apertures, holes, center pitch; the manner shown marked overall length, width and height dimensions of control; valve flow resistance coefficient; effective opening and closing times; valve factory testing data and related installation, maintenance precautions. General Requirements 1.1 pneumatic valve size and type, comply with the piping design documents. 1.2 pneumatic valve models should be specified in accordance with the national standard code requirements. If the enterprise standard stainless steel valve manufacturers, identifying types of instructions. 1.3 pneumatic valve operating pressure Weifang stainless steel valves, requires working pressure ≥ pipeline under the premise does not affect the price of stainless steel valve manufacturer, the valve can withstand working pressure should be greater than the actual pipeline working pressure pneumatic valve; pneumatic valve closed condition either side should be able to withstand 1.1 times the value of the working pressure valve without leakage; valve open position, the valve should be able to withstand twice the working pressure valve requirements. 1.4 pneumatic valve manufacturing standards, should explain the basis of the national standard code, if the file should be attached to business enterprise standards, procurement contract. Material category ① pneumatic valves pneumatic valve sealing surface varies, sealing method and material requirements vary; ② ordinary wedge gate valve, copper ring material, fixation methods, polishing should explain; ③ soft sealing valve, the valve plate rubber lining physical chemistry of materials and health testing data; ④ valve sealing surface should be marked on the body sealing surface materials and butterfly board material; their physical and chemical test data, in particular the health requirements of rubber, anti-aging properties, wear resistance; usually nitrile rubber and EPDM rubber, non-mixed with recycled plastic. Wholesale stainless steel valves | stainless steel valves | valve provided by the Shandong Shandong Everbright Everbright Valve Co. Shandong Everbright Valve Co., Ltd. (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!