Importance

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Abstract

The present invention discloses a bidirectional pressure self-balancing stop valve, comprising a valve body, a valve disc, a press ring, a valve bonnet, a valve rod and a balance hole, in which the valve disc is located inside the valve body chamber, the press ring is threadedly disposed on the upper side of the valve body chamber, the valve bonnet is fixedly connected with the valve body, the valve rod passes through the valve bonnet and the lower end of the valve rod is movably connected with the valve disc. The excircle of the valve disc, the press ring and the valve body form an annular groove, inside which is disposed with a composite seal ring that is high temperature resistant or corrosion resistant. The composite seal ring includes an upper washer, an upper seal ring, an upper distance ring, a blocking ring, a lower distance ring, a lower seal ring and a lower washer from top to bottom. The invention uses a bidirectional self-sealing structure. As the high temperature resistant composite seal ring is made of high temperature resistant sealing material with low density, the similar pressure self-sealing property of O or Y-shaped seal rings can also be obtained and then the sealing quality and sealing lifespan will be durable and reliable. In addition, the corrosion resistant composite seal ring made of corrosion resistant sealing material can be used in many corrosive environments.

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First Claim