Thread inserted pilot pressure increasing secondary overflow valve

Abstract

The invention discloses a thread inserted pilot pressure increasing secondary overflow valve. The thread inserted pilot pressure increasing secondary overflow valve is characterized by comprising a main valve bush, a main valve core, a pilot valve seat, a sliding valve core, a pilot valve core, a pressure regulating valve bush, a push rod, a piston and a connecting sleeve, wherein the main valve bush is axially hollow; a first oil port is formed in the front end of the main valve bush; a second oil port is formed in the side wall of the main valve bush; the main valve core is movably arranged in the main valve bush and is used for controlling the on-off of the first oil port and the second oil port; the front end of the pilot valve seat is arranged at the rear end of the main valve core in a sealing manner; a first oil chamber is formed between the pilot valve seat and the main valve core; the sliding valve core is arranged on the main valve core; the middle of the sliding valve core is provided with a first oil channel for connecting the first oil chamber with the first oil port. The thread inserted pilot pressure increasing secondary overflow valve disclosed by the invention has high adjusting precision and good adjusting linearity; the thread inserted pilot pressure increasing secondary overflow valve has one-way oil replenishing and pilot pressure increasing functions, and realizes the aims of accurately limiting and controlling negative load pressure and ensuring safe operation of a hydraulic system.

Description

technical field [0001] The invention relates to an overflow valve, which belongs to the technical field of hydraulic control valves and is mainly used in mobile hydraulic systems. Background technique [0002] Mobile hydraulics are primarily used in vehicles, implements and equipment that move outdoors by themselves. Mobile hydraulic components are an important part of mobile hydraulic technology. The structure of mobile hydraulic components is light, small and compact. There are strict restrictions on their weight and volume, and they require high power density. Usually, they are installed in the form of threaded plug-in, and various components are integrated in the same On the valve body; the load uncertainty of mobile hydraulic machinery is relatively strong, which is mainly reflected in the severe fluctuation of system pressure, so the requirements for the allowable peak pressure, continuous working pressure, life and control accuracy of its components are obviously diff...

AI Technical Summary

Problems solved by technology

Mobile hydraulic components are an important part of mobile hydraulic technology. The structure of mobile hydraulic components is light, small and compact. There are strict restrictions on their weight and volume, and they require high power density. Usually, they are installed in the form of threaded plug-in, and various components are integrated in the same On the valve body; the load uncertainty of mobile hydraulic machinery is relatively strong, which is mainly reflected in the severe fluctuation of system pressure, so the requirements for the allowable peak pressure, continuous working pressure, life and control accuracy of its components are obviously different from those of industrial hydraulic components. Difference; the power of mobile hydraulic systems often comes from mobile energy sources such as internal combustion engines and batteries, so the power matching between operating loads and energy sources is very emphasized. The current pilot relief valve cannot meet the requirements of short-term heavy-duty working conditions in the load spectrum

Images