Top entry ball valve

Abstract

The invention relates to a top entry ball valve and mainly solves the problem that an existing top entry ball valve is complex to open and close, has limited applicable range and has high cost. A valve body and a bonnet form a cavity which is provided with a valve element and a valve seat inside, a support is connected to the upper end of the bonnet, the valve element comprises a valve stem, a switch block and a ball composed of two half-balls, the lower end of the valve stem is fixedly connected with the switch block, the switch block is connected with the upper end of the ball composed of the half-balls, the lower end of the ball composed of the half-balls is connected with a fork rotary shaft through a lower pin, the lower end of the fork rotary shaft is provided with an adjusting structure, two roller sets are connected to the upper portion of the switch block and are inserted respectively in spiral grooves of the bonne which have a spiral groove slide bushing, the upper end of the valve stem is sleeved with a dust cover, and the valve seat is provided with a channel. The top entry ball valve has good sealing performance, the valve element moves up and down as a whole during opening and closing so that the structure is simple, the top entry ball valve is applicable to a medium with impurities or particles, is widely applicable, and has small opening and closing torque, low manufacture cost and long service life.

Description

technical field [0001] The invention relates to a valve, in particular to a top entry ball valve. Background technique [0002] A ball valve is a valve that drives a spherical valve core through the valve stem and rotates around the axis of the valve stem. It is mainly used to cut off or connect the medium in the pipeline, and is widely used in various industries. [0003] Ball valves currently on the market mainly include floating ball valves, fixed ball valves, V-shaped ball valves, swing ball valves, and double-plate ball valves. The opening and closing torque of the floating ball valve and the fixed ball valve is very large, the cost of the actuator is high, and the service life is low. Both the V-shaped ball valve and the swing ball valve have a one-way closing structure. When the double-plate ball valve is opened and closed, the valve core moves up and down as a whole with a complicated structure and is not suitable for media with impurities. Contents of the invent...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of the background technology, the present invention provides a top entry ball valve, which mainly solves the problems of complicated opening and closing, limited application range and high cost of the existing top entry ball valve. Well, when opening and closing, the spool moves up and down as a whole with a simple structure, suitable for medium with impurities or particles, wide application range, smoother and easier movement of the spiral structure, small opening and closing torque, low production cost, and long service life

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