Gate valve with function of reducing cavitation damage of valve plate

Abstract

The invention discloses a gate valve with a function of reducing cavitation damage of a valve plate. The gate valve comprises a drive mechanism, a valve rod, a support, a valve cover, a valve body, gate plates, a sealing face, a coupler and a wedge block. A drive mechanism rotary shaft drives two gate plates in the valve cover and the valve body to vertical move through the coupler and the valve rod, the inner lateral face of the valve body is welded with the sealing face, and the wedge block and the valve rod are coaxially installed on the lower bottom surface of the valve body. The gate valve is characterized in that the lateral faces of the lower portions of the gate plates are provided with inner comb teeth and outer comb teeth, the front inner comb teeth, the front outer comb teeth, the back inner comb teeth and the back outer comb teeth are distributed in a staggered mode, and the thickness of the inner comb teeth is twice of that of the outer inner comb teeth. The gate valve is provided with the two gate plates, the gate plates are contacted with the sealing face when the valve is closed and opened, and good sealing performance of the sealing face and the gate plates is achieved through tensile force of the wedge block. In addition, the opening degree is small, fluid plays the flow-shunting and pressure-reducing effect and reduces front and back pressure drop of the gate plates when passes through the comb teeth on the gate plates, and a cavitation phenomenon of the valve is decreased.

Description

technical field [0001] The invention relates to a gate valve, in particular to a gate valve with a valve plate which reduces cavitation damage. Background technique [0002] Among various types of valves, gate valves are the most widely used one. A gate valve is a valve in which the closing member (gate) moves along the vertical direction of the channel axis to achieve the purpose of opening or closing. In the pipeline, it is mainly used to connect or cut off the medium. The gate valve has a relatively small fluid resistance, which is safe and reliable; the torque required for opening or closing is small; it can be used on the ring network pipeline where the medium flows in two directions; when fully open, the sealing surface is less eroded by the working medium than the globe valve ; The shape is relatively simple, easy to cast and process; the structure length is relatively small and so on. [0003] It is widely used in hydraulic engineering in the process of oil and na...

AI Technical Summary

Problems solved by technology

[0004] At the same time, the gate valve also has some disadvantages such as large external dimensions and opening height; relative wear of the sealing surface is relatively large, which is easy to cause friction damage; and the noise is large when the opening is small.

Especially when the gate valve has a small opening, due to the small flow surface, the flow velocity of the medium is relatively high, and jet flow is formed locally, which will cause cavitation and cause damage to the gate, thereby reducing the service life of the valve.

In the environment that requires frequent opening and closing, and the working conditions are relatively harsh, such as high temperature and high pressure working conditions, the damage of cavitation is more serious, which poses a great challenge to the safety of the valve.

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