Direct-acting externally piloted one-way sequence valve

Abstract

The invention discloses a direct-acting externally piloted one-way sequence valve, which comprises a valve body (1), a main valve spool (2) and a reset spring (8). A liquid inlet (5), a liquid outlet (6) and a control liquid inlet (7) are arranged on the valve body (1), the main valve spool (2) is arranged in the valve body (1), the outer diameter of the head at the upper end of the valve body (1) is larger than that of a portion below the head, an external thread is arranged on the portion below the head of the valve body (1), one end of the reset spring (8) is connected onto the main valve spool (2), the other end of the reset spring (8) is fixed onto the valve body, the head at the upper end of the valve body is closed, and a cavity between the main valve spool (2) and the upper end of the valve body is communicated with the outside through a drainage channel (9). The external shape of the valve body is equivalent to that of a hinged bolt, a hydraulic part and a pipeline can be connected by the valve body, and the hinged bolt and the direct-acting externally piloted one-way sequence valve are integrated.

Description

Technical field [0001] The invention relates to the field of hydraulic valves, in particular to a direct-acting externally controlled one-way sequence valve. Background technique [0002] A sequence valve is a valve that controls the liquid pressure to open and close the valve port in a system with two or more branch circuits, thereby controlling the actuator to achieve a predetermined sequence of actions. Direct-acting sequence valves are divided into internal control and external control. Direct-acting external control sequence valves use the pressure of the control fluid to control the opening and closing of the sequence valve. When the pressure of the control fluid is greater than and overcomes the pressure of the spring, the main valve The core can be driven by the control fluid to make the inlet and outlet ports communicate, and the sequence valve opens, so that the next-level hydraulic components work; when the sequence valve needs to be closed, the pressure of the control...

AI Technical Summary

Problems solved by technology

[0003] Since the direct-acting external control one-way sequence valve is generally used in the hydraulic system, and the hydraulic parts and pipelines in the hydraulic system often need hollow hinged bolts to connect, when it is necessary to use the direct-acting external control one-way valve When using a sequence valve, it is necessary to install a direct-acting externally controlled one-way sequence valve on the pipeline, that is, the direct-acting externally controlled one-way sequence valve and the hinged bolt are separated, and they need to be installed and positioned separately during installation and use, and the process is relatively Trouble, the failure rate is also high at this time, which is not conducive to maintenance and brings inconvenience to use

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