Upper mounting type ball valve mounting and dismantling device

Abstract

The invention relates to an upper mounting type ball valve mounting and dismantling device which comprises a hydraulic cylinder, a fixed plate and a limiting plate, wherein the hydraulic cylinder comprises two pistons and a cylinder block; the two pistons stretch out of the two ends of the cylinder block separately; the fixed plate is arranged at the end parts of the pistons; a cylinder sleeve isfurther fixed on the outer wall of the middle of the cylinder block in a sleeving manner; a fixture block is further arranged on the side wall of the cylinder sleeve; the limiting plate comprises a plate body and a connecting column integrally formed; one end of the connecting column is fixed with the plate body; the other end of the connecting column is clamped in the fixture block on the side wall of the cylinder sleeve; cylinder block joints are arranged on the side wall of the two ends and in the middle of the cylinder block; and the cylinder block joint in the middle penetrates through the cylinder sleeve. The upper mounting type ball valve mounting and dismantling device is provided with three entrance pressure joints, and pressurization is carried out on the entrance pressure jointsof the dismantling device as demanded, so that the pistons on the two sides do work on a valve seat to mount and dismantle the ball valve and the valve seat; hydraulic action is adopted, the acting force of the pistons is sufficiently large, the acting process of the pistons is smooth and steady, and the upper mounting type ball valve mounting and dismantling device is suitable for mounting and dismantling the large-diameter ball valve and the valve seat subjected to deadlocking due to corrosion of a valve cavity.

Description

technical field [0001] The invention belongs to the technical field of valve installation, in particular to a top-loading ball valve installation and disassembly device. 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-mounted ball valve, the top-entry ball valve has the advantages of fewer leakage points and less influence of pipeline stress on it. At present, the top-entry ball valve is widely used in LNG pipelines, LNG carriers and receiving stations. Therefore, many domestic valve manufacturers All have invested a lot of manpower, material resources and financial resources to study the top entry ball valve. [0003] The top-entry ball valve for pipelines generally has a large diameter. Due to the small space in the inner cavity, the gap between the valve seat and the valve cavity is small and the friction force is large. After a certain ...

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Problems solved by technology

[0003] The top-entry ball valve for pipelines generally has a large diameter. Due to the small space in the inner cavity, the gap between the valve seat and the valve cavity is small and the friction is large. After the product is used for a certain period of time, the valve cavity is corroded and the valve seat is easily stuck. On-site maintenance and disassembly Both the seat and the ball are very difficult, and a tool for quick disassembly and installation is urgently needed

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