External pilot balance type kingston valve

Abstract

The invention aims to provide an external pilot balance type kingston valve. The external pilot balance type kingston valve comprises a two-position and three-way reversing valve, wherein the two-position and three-way reversing valve comprises a reversing valve body and a reversing valve element; the reversing valve body is fixed to a valve cover; a spring sleeve is fixed to the lower end of the reversing valve body and is internally provided with a spring; the reversing valve element is arranged inside the reversing valve body and located on the spring; a valve element thrust wheel is installed at the top end of the reversing valve element; a pressure lever support is fixed to the top end of the reversing valve body and is provided with a pressure lever; a revolute pair is formed by the pressure lever and the pressure lever support; the first end portion of the pressure lever abuts against the valve element thrust wheel; the pressure lever is matched with the spring to control the reversing valve element to move vertically; the second end portion of the pressure lever is provided with a pressure lever rotary wheel. By the adoption of the balance pressure principle, a pilot tube guides high pressure water of a water inlet of the valve into a balance pressure cavity, backward backpressure on a valve head is formed, pressure on the valve head by the high pressure water of the water inlet of the valve is completely counteracted when the valve is switched on, and thus the valve is switched on easily.

Description

technical field [0001] The invention relates to a valve, specifically a sea valve. Background technique [0002] The opening force of the existing large submersible deep sea valve is very large. When the water pressure is high, it is very difficult to open the valve manually. When using automatic driving equipment, the output force of the required driving equipment is very large. The general solution It adopts a pilot-operated structure, pouring high-pressure water from the water inlet of the valve into the balance pressure chamber to form a downward force on the valve head, thereby offsetting part or all of the water pressure, while the conventional pilot-operated structure is an internal pilot. The pilot hole is generally relatively small. Due to the complex environment in seawater, the pilot hole is easy to block and easy to clean, so manpower or driving equipment cannot open the valve, resulting in valve failure. Contents of the invention [0003] The purpose of the p...

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Problems solved by technology

[0002] The opening force of the existing large submersible deep sea valve is very large. When the water pressure is high, it is very difficult to open the valve manually. When using automatic driving equipment, the output force of the required driving equipment is very large. The general solution It adopts a pilot-operated structure, pouring high-pressure water from the water inlet of the valve into the balance pressure chamber to form a downward force on the valve head, thereby offsetting part or all of the water pressure, while the conventional pilot-operated structure is an internal pilot. The pilot hole is generally relatively small. Due to the complex environment in seawater, the pilot hole is easy to block and easy to clean, so manpower or driving equipment cannot open the valve, resulting in valve failure.

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