High-reliability hydraulic underwater gate valve

Abstract

The invention discloses a high-reliability hydraulic underwater gate valve which comprises a valve body; a valve seat is mounted in the valve body; a valve plate is inserted into the valve seat; a through hole is formed in the valve plate; the valve plate is fixedly connected with a valve rod; after passing through a valve cover, the valve rod is connected with a piston rod; the valve cover is fixedly connected with the valve body; the valve cover is fixedly connected with a hydraulic cylinder; the hydraulic cylinder is sealed by a lower end cover; a piston rod is mounted in the hydraulic cylinder; the piston rod passes through the lower end cover and is fixedly connected with a supporting base; the lower end cover is fixedly connected with a housing; a cavity is arranged in the housing; the supporting base is positioned in the cavity; a spring is arranged on the supporting base in a sleeving mode; one end of the spring is arranged on the lower end cover in the sleeving mode; a sleeve is connected on the supporting base; the sleeve is in threaded connection with an operating rod; the operating rod passes through an upper end cover and is positioned in a ROV interface; the ROV interface is positioned on the upper end cover; and the upper end cover is used for sealing the cavity of the housing. The high-reliability hydraulic underwater gate valve has a hydraulic drive mode and a ROV operating drive mode, and a ROV operating mechanism and a hydraulic performing mechanism can independently operate without interference, is simple in mechanism and is higher in reliability.

Description

Technical field [0001] The invention relates to a high-reliability hydraulic underwater gate valve and belongs to the field of valves. Background technique [0002] my country started relatively late in the research and development of marine underwater equipment. At present, there is no large-scale production capacity for complete sets of equipment such as underwater wellheads and Christmas trees in China. my country's marine underwater oil and gas exploration equipment is mainly imported from foreign companies. "Made in China 2025" proposes that my country should vigorously promote the development of marine engineering equipment and high-tech ships. Therefore, independent research and development and manufacturing of underwater wellhead devices and Christmas tree equipment is the only way for the development of my country's offshore oil and gas industry. [0003] The underwater valve is a key component of the underwater Christmas tree and the underwater manifold, and it plays an ...

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Problems solved by technology

[0004] At present, the underwater gate valves have the following problems: Since the underwater gate valves work in the subsea oil field, it is difficult to repair the faults, so many underwater gate valves need to have two operating modes: hydraulic and ROV, but the hydraulic execution of the existing underwater gate valves The mechanism and the thread transmission mechanism cannot operate completely independently; when the hydraulic actuator is opened, the thread action between the piston rod and the operating rod drives the entire mechanism to compress the spring action, and the long-term running thread is easily damaged by shearing, and the reliability is poor

In addition, the existing switch indicator devices for underwater gate valves are divided into two categories, one is to directly indicate the opening of the valve according to the length of the operating rod protruding from the top cover, which cannot accurately indicate the opening and closing of the gate valve; the other is The pin drives the spiral groove of the transmission shaft to rotate and drive the switch indicating device. The mechanism takes up a lot of space and is not suitable for designing in gate valves with hydraulic actuators.

[0005] The patent with the application number CN201610210994.9 proposes a high-reliability underwater gate valve actuator. The spare thread transmission mechanism and the hydraulic actuator used can operate independently without interfering with each other and have high reliability. However, the spare thread of the device The transmission mechanism adds a set of hydraulic pipelines, the structure is complex, and hydraulic oil failure is prone to occur; and the cost is high, and maintenance is difficult; and there is no switch indicating device, which cannot indicate the opening and closing of the hydraulic actuator control valve

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