Pneumatic valve gasket before installation

and check selection of gasket gasket with the name of the type, model, material should be with the working conditions of pneumatic valves ( Pressure, temperature, corrosion, etc. ) Pneumatic valve, and the static sealing surface, conform with the relevant standards and regulations. , gasket checks non-metallic gaskets, rubber asbestos board surface should be smooth and dense, there is no crack, crease, uneven thickness of wrinkles, peeling, burrs, defects, such as metal and iron package gaskets, surface should be smooth, level off, there is no crack, dent, by the scratch, burr, defects such as uneven thickness and corrosion, the tooth gasket, lens gasket, cone pad and metal self-tightening seal, in addition to the above requirements, should be shaded check and fitting, continuous shadow to qualified, to use metal gasket, generally must carry on the annealing treatment, eliminate stress, used after finishing. , check the bolt and nut quality of fasteners should be in conformity with the relevant provisions of the national standard. The type, size, material of bolt and nut shall be the working condition, conform to the relevant technical requirements. Don't allow disorderly buckle, bending, different materials, different specifications of bolt and nut. Bolt and nut should be material certificate, important bolt and nut should be checked for test and inspection. Threaded connection structure should be complete, no disorderly buckle, slide fastener, cracks and corrosion phenomena. Flange connection structure should be complete, unbiased mouth, wrong, wrong holes and cracks and other defects. , static sealing surface inspection of the static sealing surface shall comply with technical requirements. The static sealing surface width is consistent, should level off, smooth, with no residue. Dent, radial scratch, serious erosion, crack, flash and other defects. , static sealing device, in accordance with the technical requirements, clear static seal oil dirties, residues of the device. Old cushion, iron mold, bolt and nut, static sealing surface cleaning, and on the coated with the drive of graphite lubricant, or missing parts, covering the static sealing surface.