Hard seal ball valve eccentric metal seal structure, metal to metal seal in the form of seal, metal seal can be exchanged for the metal seal, stainless steel plate and graphite composite plate seal on the metal seal. In addition to the form of hard seal butterfly valve drive are: manual, worm gear transmission, pneumatic and so on. This valve is normally installed horizontally. Hard seal ball valve disc installed in the pipe diameter direction. In the hard seal ball valve body cylindrical channel, the disc-shaped disc rotates about the axis, the rotation angle is between 0 ° ~ 90 °, rotated to 90 °, the valve is fully open state. Characteristics of the new high-life stainless steel butterfly valve and the butterfly valve in the course of the existing problems Currently, the hard-sealed ball valve seal valve as a way to achieve the pipeline system on-off and flow control components, has been in the petroleum, chemical, metallurgical, hydropower Many areas have been extremely widely used. In the well-known butterfly valve technology, the sealing structure adopts the sealing structure, the sealing material is rubber, polytetrafluoroethylene and the like. Due to the structural characteristics of the restrictions, do not meet the high temperature, high pressure and corrosion-resistant, anti-wear and other industries. A more advanced butterfly valve is a three eccentric metal seal butterfly valve, the valve body and the valve seat as a single component, seat sealing surface layer surfacing temperature, corrosion resistant alloy material. Multi-layer soft stacked ring fixed to the valve plate, this butterfly valve compared with the traditional butterfly valve with high temperature, light operation, opening and closing without friction, closed with the torque of the transmission mechanism to compensate for increased sealing, improved butterfly valve The sealing performance and extend the service life of the advantages.
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