Pneumatic valve anti-corrosion material requirement

general requirements. Pneumatic valve specifications and types, pipeline scheme file should fit begged.
。 Pneumatic valve should be according to the national standard begged. Assuming that the company specifications, should indicate the type of instruction.
。 Begged than pipe pneumatic valve working pressure, working pressure, in does not affect the price under the premise of pneumatic valve can accept work pressure should be greater than the pipe internship work pressure; Pneumatic valve closed cases should be able to accept any side. Times the working pressure pneumatic valve value without leakage; Pneumatic valve open position, the pneumatic valve should be able to accept two times the working pressure of the pneumatic valve begged.
。 Pneumatic valve production specifications, shall be formulated according to the national standard number, assuming that the company specifications, buy the contract should be attached to the commercial documents.
。 Pneumatic valve information
. Pneumatic valve body material is nodular cast iron, the first, and indicate the physical and chemical examination of the trademark and internship cast iron data.
。 Pneumatic valve stem material, and strive to stainless steel pneumatic valve stem ( CR） Pneumatic valves, large diameter should be embedded in the stainless steel pneumatic valve lump.
。 Nut, choose aluminum brass or aluminum bronze, and the hardness and strength were greater than dry.
。 Pneumatic valve stem bushing material, its hardness and strength shall be no greater than the pneumatic valve stem, and soaking in the water conditions and pneumatic valve does not constitute a electrochemical corrosion.
。 Type of valve sealing surface material: pneumatic not begged for materials, methods and seal; General pneumatic wedge gate valve, copper ring, fixed way, ground rules to clarify; Pneumatic soft sealing gate valve, physical and chemical inspection and cleaning glue data of pneumatic butterfly valve plate pneumatic valve should be li ning; In the pneumatic valve sealing surface data and disc sealing surface characterized; Their physical and chemical inspection data, especially the clean begged rubber, anti-aging, resistance to wear; General nitrile rubber and rubber, ternary block into reclaimed rubber.
。 Pneumatic valve shaft packing: because in the pipeline network of pneumatic valve is opened and closed, generally is not common packing begged, in a few years not vivid, packing not aging, long sealing effect; Pneumatic valve shaft packing should also often open and closed, the sealing effect is good. Third, for the above need, pneumatic valve shaft in the day of packing and no changes or no replacement; Pneumatic valve replacement packaging, should plan to have water pressure condition changes.

speed gearbox. Housing information and begged and consistent principles of corrosion.
。 Box should be sealed, cabinet can accept rice water immersion after assembling. The opening and.
Limit equipment on the box body, and its scheduling nut should be located in box outside or inside of the box body, but need special tools to work.
。 Transmission structure scheme is reasonable, open and close the pneumatic valve drive shaft rotation, rather than moving up and down, make it, bite moderate transmission parts, does not occur with load separation skid when opening and closing.