Material category ① pneumatic valves pneumatic valve sealing surface varies, sealing methods and material requirements vary; ② ordinary wedge gate valve Z641F pneumatic valve manufacturers, copper ring materials, fixation methods, polishing should explain; ③ soft sealing valve Weifang valves, valve plate rubber lining materials physical chemistry 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 Z641F pneumatic valve vendors, especially the health of rubber requirements, anti-aging properties, wear resistance; usually nitrile rubber and EPDM rubber, non-mixed with recycled plastic. Fill valve shaft ① As the pipe network in the pneumatic valve, normally not open and close frequently, requiring the filling in a few years of inactivity, not aging filler, long-term effects remain sealed; ② fill valve shaft should also bear the frequent opening and closing time good sealing effect; ③ Given 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 the pressure of the measures under consideration to replace condition. Z641F pneumatic valve Sellers | Everbright valve (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.