Top-mounted low temperature floating ball valve

Abstract

The invention relates to a top-mounted low temperature floating ball valve which comprises a valve body (1), a spherical valve core (4) and a fixator (6). The valve body (1) is provided with an inlet (2) and an outlet (3); a cavity is formed inside the valve body (1); the spherical valve core (4) is arranged in the cavity; the spherical valve core (4) is provided with a through passage (5) in the horizontal direction; the spherical valve core (4) can rotate around the vertical axis of the spherical valve core; the fixator (6) is arranged in the cavity and is positioned on the side of the spherical valve core (4), which is close to the outlet (3); a ring-shaped groove of the fixator (6) is provided with an outlet side valve seat (7); the outlet side valve seat (7) is in sealed contact with the spherical valve core (4); the outer wall of the fixator (6) is directly and fixedly connected with the valve body (1) in a gapless manner. According to the top-mounted low temperature floating ball valve disclosed by the invention, no leakage point exists between the fixator and the valve body, the valve has good sealing performance and the top-mounted low temperature floating ball valve is safe and reliable.

Description

technical field [0001] The invention relates to the technical field of low temperature valves, in particular to a top entry low temperature floating ball valve. Background technique [0002] With the increasing development of liquefied natural gas in the international energy market, the application range of cryogenic valves is becoming wider and wider. At the same time, with the advancement of localization of equipment, domestic low-temperature industries such as liquefied natural gas (LNG) are also developing rapidly, and the demand for low-temperature valves in related industries is increasing. [0003] Ball valve is one of the most widely used valves. It has the advantages of reliable sealing, simple structure, convenient maintenance, the sealing surface and the ball are always in a closed state, and it is not easy to be eroded by the medium. The ball of the floating ball valve is floating. Under the action of medium pressure, the ball can produce a certain displacement ...

AI Technical Summary

Problems solved by technology

In the floating ball valve mentioned above, a compression spring is arranged between the valve stem and the eccentric sphere (spherical valve core) to provide a certain pre-tightening force for the spherical valve core and assist the sealing of the spherical valve core, although this compression spring can give the valve stem A certain upward lifting force can limit the downward movement of the valve stem to a certain extent, but once the downward pressure of the compressed packing exceeds the spring force of the compression spring, the valve stem will still move downward, and the spherical valve core of the valve stem is hardened. Squeeze downward, because of the wedge-shaped structure design, it is easy to cause the valve seat and the spherical valve core to lock, the valve cannot be opened and closed, and the seal between the spherical valve core and the valve seat is affected

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