Consistent shift gearbox 3.1 external enclosure materials and corrosion requirements and body principles. 3.2 Measures should be sealed box after box assembly can withstand immersion three meters of water conditions. 3.3 valve opening and closing stopper factory box on the adjustment nut should be in cabinets or located outside the box valve brand, but special tools need to work. 3.4 Drive structural design is reasonable, open and close valves can only drive shaft rotation, as not to traverse up and down the valve, bite moderate transmission parts, does not produce open and close with a load when the separation skid. 3.5 Transmission Box Office with the valve shaft seal leak can not be connected to the whole, or else there should be a reliable anti-leakage measures strings. 3.6 cabinets without debris, grease should be protection gear meshing. External anti-corrosion valve pneumatic valve (including variable speed transmission box) inside and outside, at first, blasting sand blasting, seek non-toxic epoxy powder electrostatic spraying, the thickness of 0.3mm or more. Large electrostatic spraying non-toxic epoxy resin valve difficulty should brush, spray similar to non-toxic epoxy paint. And various parts of the body inside the valve plate for a full preservative valve type, on the one hand immersed in water will not rust, no electrochemical corrosion between the two metals; two aspects of smooth surface to reduce drag through the water. 6.3 valve body paint anti-corrosion epoxy resin or health requirements, should test reports appropriate authority of the organs. Chemical and physical properties should meet the relevant requirements. 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. Shandong Everbright valve (Figure) | Weifang valves | valve provided by Valve Co., Ltd. Shandong China Everbright. 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.