With the rapid development of mechanial seals  industry, the emergence of liquid sealant, used for static sealing; this new technology, often called the liquid seal. Liquid seal principle, is the use of liquid sealant

1.Liquid seal: with the rapid development of polymer organic synthesis industry, the emergence of liquid sealant, used for static sealing; this new technology, often called the liquid seal. Liquid seal principle, is the use of liquid sealant adhesion, mobility and single molecule membrane effects (the thinner the film the greater the tendency of natural reply), at the appropriate pressure, it works the same way as the washer. Therefore, the use of a sealant, also called liquid gasket.

2.PTFE seal: PTFE is a polymer organic compound, before it is sintered into a product called the raw material, soft texture, but also monolayers effects. Made with raw material called raw material with long-term storage can be rolled into a disk. When using the freely forming any joint, as long as there is pressure, they form a uniform annular film plays a role of sealing. As gasket between the body and bonnet valves can without removing the valve or shutter, forced open a gap, into the raw material brought on line. The pressing force is small, sticky, also stick flange surface replacement is very convenient. For tongue and groove flange most appropriate. Teflon, can also be made tubular and rod for sealing.

3.Hollow metal O-ring: good elasticity, pressing force is small, self-tightening effect, can choose a variety of metal materials, resulting in low temperature, high temperature and strong corrosive media can adapt.

4.Graphite sheet ring: in people's minds, graphite is a brittle material, lack of flexibility and toughness, but after graphite special treatment, but it is soft and good elasticity. Thus, heat resistance and chemical stability of graphite, it can be displayed in the gasket material; and this gasket clamping force is small, very favorable sealing effect. This graphite tape can be made, with the metal band with the composition of high performance wound gaskets. Graphite sealing ring and graphite spiral wound gasket emergence of high-temperature corrosion-resistant sealing a major breakthrough. Such washers, foreign countries have a large number of production and use.

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