Top-mounted gas storage metal hard sealing ball valve capable of being maintained online

Abstract

The invention provides a top-mounted gas storage metal hard sealing ball valve capable of being maintained online. The top-mounted gas storage metal hard sealing ball valve comprises a valve body, a ball body, a valve rod and a valve seat; a first low plane, a first step and a second low plane are sequentially arranged on the outer side face of the valve seat; a moving space used for containing a spring seat is formed between the outer side face of the valve seat and the valve body; the spring seat comprises an extending section and a moving section; the length of the extending section is larger than that of the first step; a first spring is arranged in the face, making contact with the first step, of the moving section; a spring pressing plate is fixed to the end of the extending section; a limiting part is fixed to the inner side face of the valve body; the outer side face of the spring seat comprises a third low plane and a second step; the limiting part is located on the third low plane; the spring seat slides towards the ball body; and the limiting part abuts against the second step. The ball valve is in a top-mounted type, the sealing performance is stable and reliable, fire prevention and static prevention are achieved, the total torque of the valve is small, a second spring energy storage sealing ring and a first spring energy storage sealing ring are arranged so that bidirectional sealing can be achieved, and downstream inspection and maintenance are facilitated.

Description

technical field [0001] The invention belongs to the technical field of ball valves, and in particular relates to a metal hard-sealed ball valve of a top-mounted gas storage that can be maintained online. Background technique [0002] Ball valve has become one of the most widely used valves due to its reliable sealing, simple structure and convenient maintenance. Compared with the side-entry ball valve, the top-entry ball valve has the advantages of fewer external leakage points and less influence of pipeline stress on it. At the same time, the top-entry ball valve is widely used because it can realize convenient online maintenance. [0003] Since the end of the valve is usually welded and connected, it needs to be able to be maintained online, and the cavity can be automatically released in time when the cavity is overpressured, while ensuring the reliable sealing performance of the valve to meet the pipeline process requirements. The existing ball valves have the following...

AI Technical Summary

Problems solved by technology

The existing ball valves have the following problems. Take the two-piece or three-piece side-mounted valve body structure as an example. Specifically, the floating ball structure is to drill holes on the ball to realize automatic pressure relief; another example is the fixed ball structure. Drilling holes on the upstream valve seat to achieve automatic pressure relief, none of these structural forms can meet the needs of online maintenance. The basic requirements of pipeline valves have deviated; and the drilling of fixed ball structure valve seats is completely dependent on the check valve with coil spring to realize automatic pressure relief, which is extremely unreliable

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