Proportional one-way flow valve with improved performance

Abstract

The invention relates to a proportional one-way flow valve with improved performance. The proportional one-way flow valve is characterized by comprising a valve body and a valve sleeve. The valve sleeve is provided with a first oil opening, a second oil opening and a valve opening. A main valve element is arranged in the valve sleeve. The periphery conical face of the main valve element is matchedwith the valve opening. A control cavity and an installing cavity are formed in the main valve element. A first damping hole is formed in the side wall of the main valve element. A second damping hole is formed in the main valve element. The hole diameter of the first damping hole is smaller than that of the second damping hole. A pilot valve element is arranged in the control cavity and controlled by a proportional electromagnet structure to be capable of moving up and down. The lower end of the pilot valve element is matched with the second damping hole. A lining and a valve seat are installed in the installing cavity. A throttling hole is formed in the lining. A throttling valve element is arranged in the valve seat. A first spring is arranged below the throttling valve element in a supporting manner. When the throttling valve element overcomes the effect of the first spring and moves downwards, a gap between the upper end of the throttling valve element and the throttling hole becomes smaller and smaller. The proportional one-way flow valve with the improved performance is more reasonable in structure, low in cost and capable of meeting the requirement for low-load use.

Description

technical field [0001] The invention belongs to the technical field of hydraulic valves, in particular to a proportional one-way flow valve with improved performance. Background technique [0002] In recent years, proportional one-way flow valves have been used more and more in lifting equipment such as truck-mounted cranes, aerial work vehicles, tractor rotary plows, and electric forklifts. When the equipment stops, the proportional one-way flow valve plays the role of maintaining pressure to prevent the hydraulic cylinder from sliding down; when the equipment needs to descend, the proportional one-way flow valve controls the size of the opening according to the input voltage signal and adjusts the output flow of the hydraulic cylinder , and then control the descending speed of the lifting equipment. The proportional one-way flow valves currently on the market have the following disadvantages: [0003] 1. The flow control of the proportional one-way flow valve is to drive...

AI Technical Summary

Problems solved by technology

In order to prevent the main spool from opening too much when the load is too large, the throttle area of ​​the orifice controlled by the pilot spool is generally small, so that when the load pressure is 1-25 MPa, the force generated by the pressure difference on the main spool can be reduced. Make the main spool reach the required opening. When the load pressure is lower than 1MPa, the flow area is adjusted by the pilot spool, and the difference between the pressure in the control chamber of the main spool and the load pressure is very small, which results in a very small opening of the spool. Small or even not open, the required flow cannot be reached, which affects the application of the proportional one-way flow valve

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