Low-torque gate valve for wellhead equipment

By adopting a ball screw and nut mating structure in the wellhead equipment, the high torque problem caused by thread wear in the non-stick gate valve is solved, achieving low torque operation and cost savings, and is suitable for high-pressure, large-diameter gate valves.

CN122148764APending Publication Date: 2026-06-05CNPC BOHAI EQUIP MFG +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CNPC BOHAI EQUIP MFG
Filing Date
2024-12-03
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

In wellhead equipment, the opening torque of the non-stick gate valve is too high due to corrosion of the valve stem thread, especially in high-pressure and corrosive media environments where it is difficult to open and close, and the media may contain sand.

Method used

The valve stem and valve plate are connected by a ball screw and nut. The rotation of the ball screw drives the nut and valve plate to move up and down, thereby achieving a floating connection between the valve stem and the valve plate, reducing thread wear and lowering the opening torque.

Benefits of technology

It effectively reduces the operating torque of non-rising stem gate valves, making it especially suitable for high-pressure, large-diameter gate valves, reducing labor intensity, and can be interchanged with rising stem gate valves to save costs.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present application relates to the technical field of oilfield production engineering, and particularly relates to a low-torque gate valve for wellhead equipment. The low-torque gate valve for wellhead equipment mainly solves the problem that the existing dark rod gate valve on the wellhead is difficult to open due to the erosion of the valve rod. The low-torque gate valve for wellhead equipment comprises a valve plate (2), a T-shaped groove is formed in the valve plate (2), a nut (5) is fixed in the T-shaped groove, a ball screw (7) is connected to the inside of the nut (5), a valve rod (11) is connected to the upper end of the ball screw (7), and a hand wheel (12) is connected to the end of the valve rod (11). The low-torque gate valve for wellhead equipment can solve the problem of excessive opening torque of the high-pressure large-diameter dark rod gate valve, and makes the gate valve reliable in opening and closing.
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