A master built-in separate pilot relief valve

By designing a separate pilot relief valve built into the main control stage, the problems of complex structure and poor sealing in the existing technology are solved, achieving flexible flow control and stable unloading effect. It is suitable for the dual pump system of truck-mounted cranes, reducing manufacturing costs and improving the service life of the equipment.

CN224414002UActive Publication Date: 2026-06-26XUZHOU AMCA HYDRAULICS TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
XUZHOU AMCA HYDRAULICS TECHNOLOGY CO LTD
Filing Date
2025-09-01
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing pilot-operated relief valves have complex structures, many parts, and poor sealing when adapted to the dual-pump system of truck cranes, resulting in high manufacturing costs, difficult assembly, and short service life. They cannot meet the switching requirements of winch operation between high-speed operation and heavy-load steady speed.

Method used

Design a separate pilot relief valve with built-in main control stage, including pilot stage structure and main control stage structure. It adopts direct-acting relief valve and unloading valve stem. Pilot control pressure oil is provided through pilot stage. The built-in valve stem of main control stage unloads the main oil circuit of another main pump. The structure is simple and flexible and suitable for dual pump system.

Benefits of technology

It achieves flow control with simple structure, large unloading capacity and high stability, reduces manufacturing costs, improves equipment service life and versatility, and meets the operational needs of truck-mounted cranes under different loads.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224414002U_ABST
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Abstract

The utility model provides a kind of master control level built-in separate pilot relief valve, including the pilot stage structure and master control level structure connected with double pump system, the pilot stage structure provides pilot control pressure oil for master control level structure;Pilot stage structure includes valve body, throttle plug, adjustable relief valve, oil inlet cavity I and oil return cavity I;Master control level structure includes valve body II, unloading valve rod, screw plug, spring, signal cavity II, signal cavity III and oil return cavity II, oil inlet cavity I is directly connected together with signal cavity III, signal cavity I is connected together with signal cavity III by pipeline.The utility model is equipped with pilot stage structure and master control level structure, the oil inlet cavity body of two structures is respectively connected the two constant delivery pumps of double pump system, pilot stage exports pilot pressure control master control level action, master control level carries out unloading to another main pump main oil circuit, the structure layout of the application is more flexible, unloading is larger, unloading is more stable, applicable to double pump system, and structure is relatively simple, and manufacturing cost is low.
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