A cartridge-type stroke valve and a reciprocating pneumatic motor using the same.

By using a partially through-type valve stem structure and a split-modular design for cartridge-type stroke valves, the problems of bulky structure and high material cost are solved, enabling automatic reciprocating motion of the pneumatic motor and improving sealing performance, thus expanding application scenarios and reducing costs.

CN224432967UActive Publication Date: 2026-06-30CHANGZHOU HENGLI FLUID TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
CHANGZHOU HENGLI FLUID TECH CO LTD
Filing Date
2025-09-05
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing cartridge-type stroke valves suffer from bulky structure, high material costs, and uneven mounting surfaces. Furthermore, traditional solutions that increase valve stem length or thicken end caps fail to meet the requirement of a perfectly flat mounting surface.

Method used

It adopts a partially through-type valve stem structure and a split modular component design. By eliminating the need for a strong spring through differential pressure self-balancing, and combining the integrated arrangement of exhaust passage, reversing passage and intake passage on the valve body, it can achieve precise switching of air passage and pressure balance. The multi-seal ring design improves sealing performance and shortens the overall length.

Benefits of technology

It achieves automatic reciprocating motion without electrical control, expands the application scenarios of pneumatic motors in non-electrical environments, reduces material and processing costs, improves sealing performance and response accuracy, and meets the requirement of a flat mounting surface.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224432967U_ABST
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Abstract

This utility model relates to the field of reciprocating pneumatic motor technology, and particularly to a cartridge-type stroke valve and its application in a reciprocating pneumatic motor. The valve includes: a valve stem with a receiving cavity at one end, a through-hole radially formed at the end of the valve stem away from the receiving cavity, and a connecting hole within the valve stem connecting the receiving cavity and the through-hole; a valve body with a through-hole along its length, the valve stem placed within the working cavity, the valve body coaxially arranged with the valve stem, and an intake passage, a reversing passage, and an exhaust passage formed on the side of the valve body near the valve stem; a spring installed within the receiving cavity, coaxially arranged with the valve stem; and a valve cover installed at one end of the valve body, coaxially arranged with the valve stem, with an abutment groove formed on the side near the spring, into which one end of the spring is inserted. This utility model effectively solves the pressure balance problem of pneumatic motors, significantly reduces manufacturing costs, and overcomes the prominent defects of traditional through-hole valve stems.
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