valve

JP2025507954A5Pending Publication Date: 2026-03-09HYDAC FLUITECHNIK GMBH
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Patent Information

Application Number
JP2024552394
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2022-03-04
Filing Date
2023-03-01
Publication Date
2026-03-09

AI Technical Summary

Technical Problem

In the prior art, the ratio of high flow rate and low flow loss increases the opening cross-sectional area and stroke of the main piston, resulting in friction and resistance generated by the difference in fluid and pressure interfering with switching operation. Especially in mechanical operation, the rejuvenation force is not sufficient to overcome the friction, resulting in valve dysfunction.

Method used

By designing a tightly sealed seat surface on the pilot piston, a linear sealing edge is formed using the inclination surface of different inclinations, increasing the sealing pressure and improving the sealing performance. In addition, multiple sealed seat surfaces and flow paths are designed to ensure reliable guidance and fluid passages of the main piston and pilot piston at various locations.

Benefits of technology

It realizes a sealed and adjustable position within the high load range, avoids unexpected load drops, improves the safety and reliability of the valve, and ensures flow control accuracy.

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Abstract

A valve, in particular a proportional valve, comprising a main piston (10) for controlling a main volume flow and a pilot piston (12) for controlling a pilot volume flow, the main piston (10) and the pilot piston (12) being guided longitudinally movably in a valve housing (14), the pilot piston (12) being controllable by a solenoid device (16), characterized in that the position of the main piston (10) is controllable by the pilot piston (12), which, depending on its moving position, either transmits the fluid pressure present in the main piston (10) via a fluid communication (18) to a pilot chamber (20) or interrupts the fluid communication (18) and connects the pilot chamber (20) to a tank side or to a low pressure side (T) via another fluid communication (19), in which a valve means (21) is introduced which closes in a seat-tight manner as soon as the fluid communication (18) between the main piston (10) and the pilot chamber (20) is established.
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