Self-sealing eccentric hemispherical valve

Abstract

The invention discloses a self-sealing eccentric half-ball valve which comprises a valve body, wherein a liquid inlet cavity is arranged in the valve body; one end of the valve body is provided with a water inlet communicated with the liquid inlet cavity, and the other end is provided with a water outlet communicated with the liquid inlet cavity; the top of the valve body is connected with a valve cap; the valve cap is connected with a main valve shaft; the bottom of the valve body is provided with an auxiliary valve shaft; a half ball valve plate connected to the main valve shaft and auxiliary valve shaft is arranged in the liquid inlet cavity; the surface of the half-ball valve plate is coated with an elastic sealing layer; the elastic sealing layer of the sealing surface of the half-ball valve plate and the inner port position of the water inlet form a contact fit to form an axial sealing pair capable of implementing axial sealing; and the elastic sealing layer on the sealing surface of the half-ball valve plate and the wall of the water inlet form a contact fit to form a radial sealing pair with radial self-sealing effect. The self-sealing eccentric half-ball valve has the dual effects of axial sealing and radial sealing, can not easily cause seepage or leakage, and has the advantages of small opening torque and longer service life.

Description

technical field [0001] The invention relates to a self-sealing eccentric hemispherical valve. Background technique [0002] At present, the known eccentric hemispherical valve includes a valve body, which is provided with a liquid inlet chamber, one end of the valve body is provided with a water inlet hole communicated with the liquid inlet chamber, and the other end is provided with a water outlet hole communicated with the liquid inlet chamber. The top is connected with a bonnet, the bonnet is connected with the main valve shaft, the bottom of the valve body is provided with an auxiliary valve shaft, and the liquid inlet chamber is provided with a hemispherical valve plate connected to the main valve shaft and the auxiliary valve shaft. The surface is covered with an elastic sealing layer. The seal is realized by extruding the elastic sealing layer through the cooperation of the hemispherical valve plate and the port in the water inlet hole to deform it. For the eccentri...

AI Technical Summary

Problems solved by technology

For the eccentric hemispherical valve with the above structure, when the compression deformation of the elastic sealing layer is small, it is easy to cause leakage or leakage of the ball valve.

If the compression deformation is increased, the opening and closing torque will increase and the life of the valve plate will be shortened

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