Pilot operated water pressure relief valve

Abstract

The invention relates to a pilot-operated type water pressure overflow valve which comprises a main valve and a pilot valve. The main valve comprises a main valve body, a main valve sleeve and a main valve element, and the pilot valve comprises a pilot valve body, a pilot valve seat, a pilot valve element and a pilot valve pressure adjusting spring; the main valve element is of a slide valve structure, the end of the main valve element is in a parabola shape and is provided with a throttling groove, four draining holes are formed outward in the surface of the inner wall of the throttling groove, and micro holes are uniformly formed in the outer cylindrical surface of the main valve element matched with the main valve sleeve; the pilot valve element is of a cone valve structure, an annular stepped hole is formed at the cone angle of the end of the inner hole of the pilot valve seat, a guide piston is arranged on the pilot valve element, and a pressure adjusting cavity is defined by the guide piston, a guide cylinder installed on a pressure adjusting screw handle and a valve element hole in the pilot valve body; an annular groove is formed in the end face of the guide piston. By means of the pilot-operated type water pressure overflow valve, the cavitation, vibration and noise can be reduced, the hydrodynamic lubrication performance of the main valve element can be improved, and the wiredrawing corrosion can be reduced.

Description

technical field [0001] The invention relates to the technical field of valve manufacturing, in particular to an overflow valve suitable for medium and high pressure water hydraulic systems using seawater, fresh water, high water base, etc. as working media, and in particular to a pilot-operated hydraulic overflow valve. Background technique [0002] Hydraulic technology is a new technology that uses natural fresh water, sea water or tap water instead of mineral oil as the working medium of the hydraulic system. Like oil pressure technology, it belongs to hydraulic transmission technology. In the development process of hydraulic transmission technology, water has played a very important role as the medium of power transmission, exchange and control. Today, when resources are scarce and environmental protection is advocated, the application of water as the working medium of hydraulic transmission technology has the following advantages: 1. Eco-friendly, environmental protectio...

AI Technical Summary

Problems solved by technology

[0006] 3. Large leakage: Since the viscosity of the water medium is about 1 / 30-1 / 40 of that of the oil, the leakage of the oil is larger than that of the oil under the same flow area and pressure difference, resulting in a decrease in the volumetric efficiency of the system;

However, this kind of overflow valve cannot reduce the wear of the main valve core. The damping chamber formed in the pilot valve, when the water medium acts on the end surface of the guide cylinder, will easily cause the flow line to be unstable and produce impact noise.

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