A valve seat sealing surface switchable gate valve and a valve seat manufacturing method

By designing a reversible valve seat sealing surface and positioning ring structure, the problems of non-removable valve seats and easy failure are solved, enabling efficient maintenance and long service life of gate valves, and reducing maintenance costs and downtime.

CN122305243APending Publication Date: 2026-06-30NANTONG POWER STATION VALVE
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANTONG POWER STATION VALVE
Filing Date
2026-05-29
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing gate valves have seats that are not removable or are difficult to disassemble and assemble, are prone to failure, have high maintenance costs, and have short service life on one side of the sealing surface. They cannot meet the requirements for rapid inspection and maintenance, which affects pipeline maintenance efficiency and downtime.

Method used

A gate valve with switchable valve seat sealing surface is designed. By setting a flip-up first sealing surface at both ends of the valve seat and connecting it with positioning parts and fasteners, the valve seat can be detachably installed. The valve also avoids media impact under high temperature and high pressure conditions. The positioning ring and protrusion structure simplify the processing technology.

Benefits of technology

It extends the service life of gate valves, meets the needs of rapid maintenance, reduces maintenance costs, avoids downtime caused by valve seat displacement and media leakage.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention relates to the field of gate valve technology, specifically disclosing a gate valve with switchable seat sealing surfaces. The valve includes a valve body, positioning elements, valve seats, a valve stem, and a gate. Two positioning elements are respectively disposed on the inner wall of the valve body. The number of valve seats is the same as the number of positioning elements, and they are arranged in a one-to-one correspondence. Each valve seat is connected to its corresponding positioning element by a fastener. The valve stem passes through the valve body, and its lower part is connected to the gate. The gate has second sealing surfaces on both sides, and each valve seat has first sealing surfaces at both ends. The first sealing surfaces at both ends of the valve seat can seal against the second sealing surface on the same side of the gate. This invention allows the installation direction to be adjusted by flipping the valve seat, enabling the first sealing surfaces at both ends of the valve seat to seal against the second sealing surface on the same side of the gate. This structural design can extend the service life of the gate valve by at least twice that of existing gate valves, while also meeting the needs for rapid deployment in emergency situations.
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