Load Sensing Balancing Valve

Abstract

The invention discloses a load sensing type balance valve. The load sensing type balance valve comprises a valve sleeve. A front valve sleeve cavity is formed in the front portion of the valve sleeve, and a rear valve sleeve cavity is formed in the rear portion of the valve sleeve. A main valve cavity comprises a front segment cavity body, a middle segment cavity body and a rear segment cavity body. A main valve element is arranged in the main valve cavity. The rear valve sleeve cavity is internally provided with a reset spring and a spring seat, wherein the reset spring is connected with the front end of the main valve element in an abutted manner, and the spring seat is connected with the front end of the reset spring in an abutted manner. A one-way valve achieving communicating from the rear portion to the front portion in one direction is arranged at the front portion of the middle segment cavity body, and connection and disconnection of the one-way valve are controlled through the main valve element. A valve body is provided with a load opening communicating with the rear portion of the middle segment cavity body. The valve body is provided with an oil outlet communicating with the rear portion of the front segment cavity body. The balance valve is provided with a load sensing oil channel enabling the load opening to communicate with the front valve sleeve cavity. A plunger adjusting assembly driven by load sensing hydraulic pressure oil conveyed through the load sensing oil channel is arranged between the front valve sleeve cavity and the rear valve sleeve cavity. According to the load sensing type balance valve, when a small load or no load exists, the pilot pressure will be reduced along with reducing of the load, and the purpose of saving energy is achieved.

Description

technical field [0001] The invention relates to a hydraulic valve, in particular to a balance valve. Background technique [0002] The balance valve, also known as the load motion control valve, is also called the motion control valve. By increasing the back pressure of the oil return during the load motion process, it can achieve a balanced load and maintain a smooth motion. Since the pilot port and the working port are connected to the work of the actuator The port can form a closed-loop control, effectively stabilize the flow, and thus play the role of stabilizing the speed. Since the balance valve mainly increases the back pressure, and the set pressure is usually 30% to 50% greater than the maximum load, the balance valve is an energy-consuming component in the system, and stability is obtained through power consumption. At present, the existing technology is to fix the set pressure, which is generally 1.3 to 1.5 times the maximum load. When the load becomes smaller or...

AI Technical Summary

Problems solved by technology

At present, the existing technology is to fix the set pressure, which is generally 1.3 to 1.5 times the maximum load. When the load becomes smaller or no-load, the back pressure of the full load is also required, so the pilot pressure must be increased to open the set pressure. pressure, which will cause unnecessary output of useless work, resulting in waste of energy

[0003] Therefore, the current balance valve exists in the process of use. 1. The set pressure cannot be changed with the size of the load; 2. The pilot control pressure changes with the change of the load; 3. The pressure needs to be preset according to the size of the load; 4. , high power consumption

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