An underwater valve hydraulic drive device

Abstract

The invention discloses a hydraulic drive device for an underwater valve, which comprises a casing, a cylinder body and a top cover, a cavity is formed between the casing, the cylinder body and the top cover, a driving rod is arranged in the cavity, and the The driving rod includes an operating rod, a valve stem nut and a piston rod in turn, the operating rod is covered with a central gear, the lower part of the operating rod is covered with a valve stem nut, and the upper end of the piston rod is fixed to the lower end of the valve stem nut. connection; the cavity is provided with a bearing seat, the bearing seat is set on the outer periphery of the operating rod, and the outer periphery of the bearing seat is provided with an upper support, and the upper support and the bearing seat are located above the valve stem nut. The sun gear is keyed to the joystick. In the underwater valve hydraulic driving device of the present invention, the central gear is connected with the spline of the operating rod to drive the operating rod to rotate without affecting its axial movement; the upper support is not connected to the piston rod to prevent the elastic member from being compressed when the ROV is driven. It is beneficial to reduce the operating torque of the ROV drive and improve the operability of the drive device.

Description

technical field [0001] The invention relates to the technical field of underwater valves, in particular to a hydraulic drive device for underwater valves. Background technique [0002] Underwater valve is a general term for all valves applied to underwater pipelines. It is mainly used in underwater manifolds and pipelines of offshore oil and gas projects. Its operation methods include hydraulic control operation, underwater robot (Remote Operated Vehicle, ROV) Operation and diver operation, by manipulating the operating lever to control the opening or closing of the valve. [0003] In the prior art, for example, a utility model application patent with the patent application number 201921526688.1 discloses a hydraulic actuator for underwater valves, which has two driving modes: hydraulic drive and ROV drive. In the cavity, the utilization of the space in the cavity is maximized; by arranging the valve stem nut assembly in a combination of multiple parts, it can reduce the op...

AI Technical Summary

Problems solved by technology

However, the hydraulic actuator disclosed in the above-mentioned patent has a compressed spring structure, which will compress the spring no matter when using hydraulic drive or ROV to drive the valve, which increases the number of compressions of the spring and speeds up the damage of the spring; in addition, When using ROV to drive, the spring is compressed, so that the operating torque of the driver is large, which is easy to cause damage to the driver and reduce its service life

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