Pilot operated type overflow valve

Abstract

The invention discloses a pilot operated type overflow valve which comprises a main valve and a pilot valve, wherein the main valve comprises a main valve body, a main valve sleeve assembly and a main valve core; the main valve sleeve assembly comprises a main valve seat, a main valve sleeve and a main valve spacer sleeve, which are arranged in the main valve body; the main valve sleeve and the main valve spacer sleeve are arranged in the inner hole of the main valve seat and are in interference fit with the inner hole of the main valve seat; the main valve sleeve is axially positioned through a step surface on the main valve seat and the lower end surface of the main valve spacer sleeve; and the main valve core is arranged in the main valve sleeve and in clearance fit with the inner hole of the main valve sleeve. According to the pilot operated type overflow valve disclosed by the invention, separate processing of the main valve sleeve and the main valve seat is facilitated, the processing difficulty is reduced, and the overflow valve is enabled to have good whole processability and is low in cost; the main valve sleeve is made of natural bone material through machining and matched with the main valve core, and by using good water lubrication capability and impact resistance of the bone material, leakage is reduced while friction between the main valve core and the main valve sleeve is reduced, so that the purposes of improving static and dynamic properties of the overflow valve are realized.

Description

technical field [0001] The invention belongs to the technical field of hydraulic valves, and more specifically relates to a pilot relief valve, which is used in a hydraulic system as a pressure control element and is suitable for hydraulic systems with seawater, fresh water, high water base, etc. as working media. Background technique [0002] Relief valve is a commonly used pressure control component in hydraulic system. It can be used as a constant pressure relief valve to adjust the working pressure of the system or a safety valve to protect the system. [0003] For the overflow valve used in seawater (or fresh water, high water base) medium, there have been many researches at home and abroad, but there are still some technical problems: due to the low viscosity of water and poor lubricity, the leakage between the valve core and the valve sleeve is large Due to the leakage of the oil pressure valve, the pressure regulating performance of the relief valve is affected. In ...

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Problems solved by technology

[0003] For the overflow valve used in seawater (or fresh water, high water base) medium, there have been many researches at home and abroad, but there are still some technical problems: due to the low viscosity of water and poor lubricity, the leakage between the valve core and the valve sleeve is large Due to the leakage of the oil pressure valve, it affects the pressure regulating performance of the relief valve

In this regard, the usual measure is to add a combined seal between the valve core and the valve sleeve, which can reduce the leakage, but the friction on the valve core increases after the seal is added, which makes the working stability and static performance of the valve more stable. and dynamic performance are affected

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