Three-way non-return speed control valve

Abstract

The invention discloses a three-way non-return speed control valve. The three-way non-return speed control valve comprises a valve body, the valve body is provided with an A opening, a T opening and aP opening, a pressure compensation valve element is arranged in the valve body, the pressure compensation valve element is provided with a first through-flow hole, the upper portion of the pressure compensation valve element is provided with a throttle valve pocket, the throttle valve pocket is provided with an orifice, a second through-flow hole and a third through-flow hole, and a control spring is arranged between the throttle valve pocket and the pressure compensation valve element; the lower portion of the pressure compensation valve element is provided with a bush, a spring seat and a one-way spring, a through-flow cavity is formed between the throttle valve pocket and the valve body, the orifice is communicated with the A opening through the through-flow cavity, a control cavity isformed between the pressure compensation valve element, the spring seat, the bush and the inner wall of the valve body, and the control cavity is communicated with the P opening. The three-way non-return speed control valve has the advantages that the structure is simple and compact, the volume is small, the function of one-way speed regulation can be completed, and the pressure compensation cankeep the flow constant.

Description

Technical field [0001] The invention relates to the technical field of speed regulating valve manufacturing, in particular to a three-way one-way speed regulating valve. Background technique [0002] The one-way speed control valve is widely used in the speed control of mechanical hydraulic systems. Its function is to enable the working parts to realize one-way stepless speed regulation independent of load; the existing traditional one-way speed control valve mainly includes a valve body and a regulating hand wheel , Flow regulating rod, throttle valve core, slide valve, regulating screw seat and spring seat. [0003] The hydraulic oil enters the throttle cavity from the pump station through the oil inlet channel. The throttle mechanism is composed of the throttle valve core, the flow adjustment rod, the adjustment handwheel and the adjustment screw seat. After stepless adjustment of the flow, the oil outlet channel Enter the working oil cylinder, so that the speed of the working ...

AI Technical Summary

Problems solved by technology

Although this one-way speed control valve can realize one-way stepless speed regulation of the working parts, it needs a higher pressure to open the slide valve when the working cylinder returns quickly, so it is not suitable for use in low-pressure circuits.

At the same time, because the throttling mechanism and the slide valve are separately arranged in the intersecting hole in the valve body, the speed regulating valve has a large volume and a very complicated structure, and requires several more process holes, which increases the external leakage link and is difficult to manufacture. The cost is high, and it is limited by the huge shape during use, so it cannot be used in a small installation space

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