Valve shaft packing 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 In view of the above requirements, the valve, fill valve shaft does not seek to change or 10 years for life without replacement; ④ Packing For replacement, under measures have water pressure conditions change pneumatic valve design should be considered. 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 standards, should be specified instructions model. 1.3 pneumatic valve operating pressure, stainless steel valves, requires the working pressure ≥ pipeline, without affecting the price of the premise, the valve can withstand working pressure should be greater than the working pressure of the pipeline actual pneumatic valve; pneumatic valve closed condition either side should be under able to withstand 1.1 times the value of the working pressure valve without leakage; valve open position, Shandong high temperature and pressure valve, 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, Weifang stainless steel valves, should be attached to business documents if the enterprise standards, procurement contract. Pneumatic valve Classification [pneumatic valve main types manner] 1) pneumatic V type ball valve 2) Pneumatic O type cut off ball 3) of torque type cylinder valve 4) electromagnetic diaphragm 5) pneumatic diaphragm straight program 6) electric valve Shandong Valve Co., Ltd. Everbright wide production of this type of valve application, reliable quality, no leakage, leakage phenomenon, frequent switching is not stuck, rusted, the majority of chemical plants, thermal power plants, steel mills, printing and dyeing, food the best choice for the plant. Shandong stainless steel valves, Shandong Everbright valves, Valve Co., Ltd. by Shandong Everbright valve. Shandong stainless steel valves, Shandong Everbright Valves Valve Co., Ltd. Shandong China Everbright (www.sdgdfm.com) this year introduced a new upgrade, the above picture is for reference only, please call the telephone or pictures on this page, for the latest information Contact: Manager Ma.