A direct-acting proportional relief valve

Abstract

The invention relates to a direct-acting type ratio overflow valve which comprises a ratio electromagnet, a spring base, a spring, a valve core, a valve base, a valve body and an adjusting screw, wherein a push rod of the ratio electromagnet is directly connected with the valve core or is connected with the valve core through a transition rod, the spring base is directly arranged on the end surface of the ratio electromagnet, and the spring is arranged on the spring base and the valve core; and spring force and force output by the ratio electromagnet are acted on the valve core in a superposition manner, when the input is zero, the ratio overflow valve can have high opening pressure, the adjusting screw is adjusted to change the spring force, a characteristic curve of the ratio overflow valve moves in an upper-down manner, and a dead zone of the ratio overflow valve can not be increased. According to the valve, the requirements that the direct-acting type ratio overflow valve has the high opening pressure when an input signal is zero, and when the input signal is increased, the opening pressure is increased in a ratio manner, and the dead zone is small can be met, and the cost is low.

Description

technical field [0001] The invention relates to a valve, in particular to a direct-acting proportional overflow valve. Background technique [0002] The proportional relief valve has more powerful functions than ordinary relief valves, these functions include: convenient pressure adjustment; constituting a constant pressure source of the hydraulic system; conveniently forming a pressure negative feedback system; reasonably adjusting the amplitude of the control signal to obtain hydraulic pressure The overload protection function of the system, etc. [0003] The direct-acting proportional relief valve with force control proportional solenoid is usually composed of proportional solenoid, valve body, valve core and valve seat. The force output by the proportional solenoid push rod directly acts on the valve core through the guide cylinder. The increase of the electromagnetic force increases proportionally, so that the opening pressure also increases proportionally. In the cas...

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the technical problem that the existing direct-acting proportional relief valve cannot meet the requirements of high cracking pressure when the input signal is zero, proportional increase of cracking pressure when the input signal increases, small dead zone and low cost, and proposes a A new type of direct-acting proportional relief valve, which can have high cracking pressure when the input signal is zero, the cracking pressure increases proportionally when the input signal increases, the dead zone is small, and the cost is low

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