Top-mounted pipeline ball valve

Abstract

The invention discloses a top-mounted pipeline ball valve. Notch mortises are formed in the upper portions of the two sides of a channel of a valve body, limiting holes are formed in the planes of the notch mortises, supporting plates are installed on the notch mortises, anti-loosening holes and threaded holes I are symmetrically formed in the supporting plates, and limiting screws are matched with pre-tightening nuts after passing through the anti-loosening holes. A blind hole matched with a pin shaft on a pre-tightening tool is formed in the side face of the pre-tightening nut, a threaded hole II matched with the limiting screw is formed in the end of the pre-tightening nut, a thrust bearing II is arranged between the upper plane of a ball body and the lower plane of the supporting plate, and a sealing ring I, a sealing ring II, a sealing ring III, a grease injection hole and a groove are arranged on the valve seat supporting ring. The grease injection opening, an emptying opening and a sewage draining opening are formed in the forward outer wall face of the valve body. The top-mounted pipeline ball valve has the beneficial effects that the top-mounted pipeline ball valve of the structure has high reliability and sealing performance.

Description

technical field [0001] The invention relates to a ball valve, in particular to a top entry pipeline ball valve. Background technique [0002] At present, the top-entry pipeline ball valve structure is commonly used. Most of the assembly methods are to pull the valve seat away from the ball from both sides of the channel to realize the top-loading of the ball. It needs to make special tooling, and the assembly is more cumbersome. Only when the valve is cut from the pipeline can it be repaired, and it does not have the function of online maintenance; [0003] In the existing top-loading structure of the threaded valve seat, when the pre-tightening nut is rotated to squeeze the spring seat, the outer circle of the nut is a single point of force, so the assembly method has defects, and the assembly is laborious, and the spring cannot be compressed to the designed size. This will lead to insufficient preload specific pressure, which will cause the medium to leak from between the...

AI Technical Summary

Problems solved by technology

The bolts of the middle flange abutting against the lifting ring need the weight of the valve, so there is a possibility that the bolts here may be broken and fail, and the bolts will inevitably loosen during the lifting process of the valve, which will cause the flange gasket in the pipeline ball valve to be damaged. The sheet is not evenly stressed, and there is a possibility of medium leakage

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