Self-balancing stop valve

Abstract

The invention discloses a self-balancing stop valve which comprises a valve body, a valve seat, a valve clack, a valve rod, a valve deck and a valve-rod operating mechanism, wherein the lower end of the valve rod is movably connected to the valve clack, and drives the valve clack to slide upwards and downwards so as to realize operations that the valve clack and the valve seat are fitted, and the valve clack is connected with the valve seat or the valve clack is separated from the valve seat; the lower end of the valve rod passes through the valve deck and then is connected to the valve clack, and contact surfaces between the valve rod and the valve deck are connected in a tight coupling mode; the valve-rod operating mechanism is connected to the valve rod so as to control the ascending or descending of the valve rod; the self-balancing stop valve also comprises a first guide cylinder, the guide cylinder is fixedly arranged on the valve body, and the valve clack is hermetically sleeved on the inside of the guide cylinder; and the valve clack is provided with a balancing through hole for communicating an inner cavity (formed between the valve clack and the guide cylinder) and an outer cavity (formed between the valve clack and the valve body). In the invention, when the valve clack is opened or closed, the up-and-down convection of media can be implemented by the through hole, thereby achieving an effect of up-and-down pressure balancing and reducing the operating torque; and the self-balancing stop valve is flexible and convenient in operation, and good in sealing effect.

Description

technical field [0001] The invention relates to a self-balancing stop valve, in particular to a self-balancing stop valve with high pressure and large diameter. Background technique [0002] Globe valve is a widely used valve product, which is used to control the transmission of medium in petrochemical, pharmaceutical, metallurgy and other fields, and plays the role of cut-off, throttling and regulation. However, it is very difficult to achieve zero leakage in the positive flow valve of the high-pressure large-diameter globe valve. It is necessary to increase the diameter of the valve stem and increase the operating model of the gearbox, which results in large operating torque and high cost. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a self-balancing globe valve with simple structure and high reliability. The balance through hole convects up and down to achieve the effect of up and d...

AI Technical Summary

Problems solved by technology

However, it is very difficult to achieve zero leakage in the positive flow valve of the high-pressure large-diameter globe valve. It is necessary to increase the diameter of the valve stem, increase the operating model of the gearbox, and the operating torque is large and the cost is high.

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