Expanding type two-way hard sealed spherical valve

Abstract

The invention relates to an expanding type two-way hard sealed spherical valve which comprises two hemispheres, a wedge body, a valve body, a valve cover, a valve rod, a supporting shaft, a roller, a positioner and the like, wherein the two hemispheres form a combined sphere; a positioning shaft is arranged at the lower end of the combined sphere, the supporting shaft is arranged in the middle of the sphere body of the combined sphere, and the supporting shaft is in a round shape; a Z-shaped groove is arranged at the middle part of the valve rod, the roller is fixed in the ''Z''-shaped groove to be used for the positioning of the lifting and rotation of the valve rod, the wedge body in the shape of a gate plate is arranged at the connecting part of the lower end of the valve rod and the upper end of the valve body, and the sphere body is combined together through the positioner; the valve rod is connected with the wedge body for connecting the sphere body and is installed in an inclination angle of 10-16 degrees, so that the sphere body can not be closely expanded; and an expanded ball clack is tightly stuck on the valve seat for sealing to form a hard-to-hard two-way seal on the valve seat. The upper sealed structure achieves zero leakage, and the structure capable of regulating flow achieves cleaning and sealing functions. The invention saves resources and cost and has convenient installation and use.

Description

Technical field: [0001] The invention relates to a pipeline control valve, in particular to a positioning shaft at the lower end of the combination ball and a support shaft in the middle of the combination ball, so that the ball can be stretched and closed flexibly and saves energy. Background technique: [0002] At present, ball valves with soft sealing seats have been widely used in projects. However, soft sealing valve seats such as polytetrafluoroethylene, rubber and nylon are not suitable for high temperature media, and are not suitable for fireproof valves, so the scope of use of ball valves is limited. To improve the reliability and technical parameters of ball valves and prolong their service life, the use of metal seals is an inevitable trend in the development of ball valves. [0003] In order to alleviate the problem of straining between metal sealing pairs of ball valves, there are existing ball valve sealing structures such as metal elastic valve seats, metal f...

AI Technical Summary

Problems solved by technology

Although these structures can improve the technical parameters of the ball valve and reduce the problem of strain, there are easy wear between the metal seal pairs, high temperature deformation, slagging in the spring groove, easy jamming of the ball valve and the valve seat, and swelling and death at high temperatures. short lifespan

Due to the problems in the comprehensive structure of the existing "expandable sealing structure" ball valve, when the ball closes and starts to rotate, the sealing surface of the upper opening of the valve seat is often strained, and at the same time, the middle of the combined ball is easy to coke and slagging directly affects the closing of the ball , the sphere is opened under high temperature conditions, the closing is not flexible, and it is easy to swell, so it is difficult to promote

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