Proportional pressure-reducing valve

Abstract

The invention relates to a proportional pressure-reducing valve, comprising a valve bush (1), a pressure-reducing valve core (2), an oil outlet (7), an oil inlet (3), an oil return port (21) and an armature assembly (11), wherein the valve bush (1) is internally provided with the pressure-reducing valve core (2), the side wall of the valve bush (1) is provided with the oil inlet (3) and the oil return port (21), a magnetic electrode (4) which is subjected to integral molding with the pressure-reducing valve core (2) is located at one side of the pressure-reducing valve core (2), a radial throttling hole (8) is formed in the middle of the pressure-reducing valve core (2) and is communicated with the oil outlet (7), a diversion trench (9) is formed in the middle of the pressure-reducing valve core (2), and a push rod (18) is in contact with the pressure-reducing valve core (2). The proportional pressure-reducing valve disclosed by the invention has the advantages that a complex process based on welding is omitted by integrally machining a magnetic tube which is made from a composite material, meanwhile, the magnetic electrode and the valve bush are integrated, so that the concentricity of the magnetic electrode and the valve bush is improved, and the proportional pressure-reducing valve is simple to assemble, low in fault rate, favorable in proportional performance and simple to operate.

Description

technical field [0001] The invention relates to a hydraulic element which can continuously and proportionally control the pressure of fluid, especially a proportional decompression valve. Background technique [0002] Proportional pressure reducing valve is a control valve that uses current change to continuously and proportionally reduce the pressure of liquid. Proportional pressure reducing valve is generally used to drive the control valve spool of construction machinery. In hydraulic transmission and control, the pilot stages of electro-hydraulic proportional flow valves and proportional directional valves are mostly electro-hydraulic proportional pressure reducing valves. [0003] Chinese patent 96211363.8 discloses a differential pressure feedback type cone valve electro-hydraulic proportional pressure reducing valve. The end of the pilot valve core is provided with a cone matching the inner diameter of the regulating valve seat, and one end of the regulating valve sea...

AI Technical Summary

Problems solved by technology

[0003] Chinese patent 96211363.8 discloses a differential pressure feedback type cone valve electro-hydraulic proportional pressure reducing valve. The end of the pilot valve core is provided with a cone matching the inner diameter of the regulating valve seat, and one end of the regulating valve seat is provided with an regulating threaded body. , the preferred value of the cone angle of the cone is 15-40°, and the diameter of the cylinder is 1-6mm. It is necessary to connect a pressure reducing valve in parallel on one side of the pilot valve body. Although the valve is technically mature, due to the The head cone of the core and the adjustable valve seat are normally open, which causes a large amount of pressure oil leakage, resulting in a large energy loss, and in production, the assembly is complicated and the production cost is high. It is only suitable for large flow rates and cannot be used for pilots. control

The valve with this structure solves the technical problem of large energy loss, but the two ends of the slide valve core are equal in area, which is limited by the force generated by the electromagnet. After the pressure difference is generated, the output flow is limited to a certain extent, and the flow is relatively Smaller, so the working pressure of the pressure reducing valve is also relatively small, it is prone to failure during use, and the mechanism is not compact

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