Pilot operated compound relief valve

Abstract

The invention discloses a pilot operated compound relief valve. The pilot operated compound relief valve comprises a main valve and a pilot valve. The main valve comprises a main valve body, a main valve sleeve, a main valve element, a spring cavity and a main valve return spring. The pilot valve comprises a pilot valve body, a pilot valve seat, a pilot valve element, a pilot valve pressure regulating spring, an annular stepped hole, a pilot piston, a guide cylinder, a pressure regulating threaded handle and a pressure regulating cavity. Three sets of double-row micro holes are formed in the outer cylindrical surface of the main valve element. A rectangular uniform-section annular compensation groove, a V-shaped divergent circumferential compensation groove and a U-shaped uniform-section circumferential compensation groove are formed in the main valve element. The outer end surface of a damping sleeve is uniformly provided with six damping cavities in the axis direction of the dampingsleeve. Each damping cavity is filled with sound absorbing material particles. Each damping cavity is sealed through a silencing screw and a vibration absorbing pad. Vibration and noise of the pilot valve can be eliminated to the greatest extent, hydraulic power of the main valve element can be compensated, and thus the performance of the whole pilot operated compound relief valve is improved.

Description

technical field [0001] The invention relates to the technical field of valve manufacturing, in particular to a pilot relief 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. In today's shortage of resources and promotion of environmental protection, the application of water as the working medium of hydraulic transmission technology has the advantages of eco-friendliness, environmental protection and pollution-free, clean and safe, avoidable fires, wide sources, and easy maintenance and maintenance. When the relief valve is used in water medium, a series of technical problems such as cavi...

AI Technical Summary

Problems solved by technology

However, the pilot valve spool in the pilot-operated hydraulic relief valve of this structure adopts a cone valve structure. When the pilot valve spool is opened or closed, the speed is very fast, and it can even reach tens to hundreds of meters per hour. Seconds, so it is easy to generate vibration, resulting in high-frequency howling sound. Although a guide piston and a guide cylinder are set up to form a pressure regulating chamber, which can increase the stability of the pilot valve spool to a certain extent and reduce noise, it still cannot be maximized. Effects of Reducing Vibration and Noise on the Performance of Pilot-operated Hydraulic Pressure Relief Valves

At the same time, during the use of the pilot-operated hydraulic relief valve with the above structure, when the water flows through the main valve core, the hydraulic force generated cannot be compensated. When the flow rate of the main valve port is large, the hydraulic force will be greater, and even cause Loss of main spool movement, which affects the performance of the entire pilot relief valve

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