Bellows Seal

As the chemical industry and the rapid development of the atomic energy industry, flammable, explosive, poisonous and radioactive substances has increased, the valve seal with the more stringent requirements on some occasions, can not use the packing seal, resulting in a new Seal form - bellows seal. Such seals do not need filler, so it is called non-positive seal packing.



Bellows at both ends, with other parts welded to die. When the valve stem movements, the corrugated tube flexible, as long as the bellows itself does not leak, media can not escape. For insurance purposes, often using a double bellows seal with the filler.



Static Seals



Static sealing usually refers to the seal between two stationary surfaces. Mainly by the use of sealed gasket.



Gasket Material



(1) non-metallic materials: such as paper, linen, leather, asbestos products, plastics, rubber and so on.



Paper, hemp, leather and the like, there are pores, easy penetration, use to be dipping oil, wax, or other impermeable material. General valves seldom used.



Asbestos products, there are asbestos tape, rope, boards, and asbestos-rubber board. Asbestos rubber sheet in which the structure compact, good pressure resistance, heat resistance is also very good, in the valve itself and the valve and the pipe flange connection, the use of very extensive.



Plastic products, have a good corrosion resistance, use was also more common. Varieties of polyethylene, polypropylene, soft PVC, PTFE, nylon 66, nylon 1010 and so on.



Rubber products, soft, all kinds of rubber were some acid, alkali, oil, water-resistant capability. Varieties of natural rubber, SBR, nitrile rubber, neoprene rubber, isobutyl rubber, polyurethane rubber, fluorine rubber.



(2) Metal Material: Generally speaking, metal materials, high strength, heat resistance strong. But the lead is not so, just take it resistant to dilute sulfuric acid characteristics. Common varieties include brass, copper, aluminum, low carbon steel, stainless steel, Monel alloy, silver, and nickel.



(3) Composite materials: such as metal foreskin (internal asbestos) washers, combination waveform gaskets, washers and other entangled.

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