New materials and new technologies

The above described sealing washer is far from comprehensive, Moreover, sealing technology is in rapid development. The following examples of a number of new materials and new technologies.



(1) Liquid Seal: As the polymer industry, the rapid development of organic synthesis in recent years emerged liquid sealant, used in static seals; this new technology, often called the liquid seal. Fluid sealing principle is the use of liquid sealant adhesion, mobility and single-molecule membrane effects (the thinner the membrane the greater the tendency of the natural reply) and, where appropriate under pressure, making it the same way as the washer works. Therefore, the use of a sealing adhesive, also known as liquid gasket.



(2) PTFE sealing raw materials: PTFE is also a high molecular organic compounds, it is sintered into a product before, called the raw material, texture soft, there are single-molecule membrane effect. Using raw materials made of raw materials with a known band, long-term preservation can be rolled into a plate. Are free to use shape, any joints, as long as a pressure, this will form an evenly played the role of ring sealing membrane. As the valve body and valve cover gasket, you can not remove the valve flap or damper circumstances, forced open a gap, into the raw material brought on the list. Clamping force is small, non-stick in hand, but also non-stick flange, the replacement is very convenient. Mortise the most suitable for the flange. PTFE raw materials can also be made of tube and rod for sealing use.



(3) Metal hollow O-ring: good elasticity, clamping force is small, there is self-energizing effect, the choice of a variety of metal materials, resulting in low temperature, high temperature and strong corrosive media can adapt to.



(4) graphite plate seals: in people's minds, graphite is a brittle material, the lack of flexibility and toughness, but after special treatment of the graphite, but it is soft, flexible sound. In this way, graphite heat resistance and chemical stability, they can be displayed in the gasket material; and this washer clamping force is small, a very favorable sealing effect. This also made of graphite tape, with the metal strip with the form-performance wound gasket. Graphite plate seals and graphite spiral wound gaskets ---- The emergence of high temperature corrosion-resistant sealed a major breakthrough. Such washers have a large number of overseas production and use.



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