A hydraulic valve for starting and unloading

Abstract

The invention belongs to the field of aviation hydraulic pressure, and relates to an unloading starting hydraulic valve having an unloading starting function, which is mainly applied to a hydraulic system which is not unloaded and has failure in normally starting a driving device. The unloading starting hydraulic valve comprises a filter screen, a valve jacket, a valve core, a shell, a gasket, a spring and a spring seat, wherein the filter screen is welded on the valve jacket; the valve jacket is arranged in the shell; the valve core is arranged in the valve sleeve; the spring is arranged between the spring seat and the valve core; and the gasket is arranged between the spring and the valve core as required. The starting flow of the hydraulic valve can be adjusted conveniently by increasing or reducing the thickness of the spring gasket to adapt to different system requirements. The unloading starting hydraulic valve has high reliability. The unloading starting hydraulic valve is a pure mechanical hydraulic device, and the valve core is provided with a pressure balancing groove, so that the valve core is prevented from being blocked; and the filter screen is arranged in front of a small hole, so that the small hole is prevented from being blocked, and the acting sensitivity of the valve core is ensured. The unloading starting hydraulic valve has high reliability. The unloading starting hydraulic valve is a pure mechanical hydraulic device, and the valve core is provided with a pressure balancing groove, so that the valve core is prevented from being blocked; and the filter screen is arranged in front of a small hole, so that the small hole is prevented from being blocked, and the acting sensitivity of the valve core is ensured.

Description

technical field [0001] The invention belongs to the field of aviation hydraulic pressure, and relates to a starting and unloading hydraulic valve with a starting and unloading function. Background technique [0002] At present, the hydraulic valves with the function of starting and unloading mostly adopt electromagnetic control. The structure of this type of hydraulic valve is complicated. Generally, due to the limitation of the power of the electromagnetic valve, this type of starting and unloading valve needs to be equipped with an electromagnetic pilot valve, which is controlled by the electromagnetic pilot valve. main valve action. The action of the electromagnetic pilot valve is driven by the current. If the current is too low, the suction force generated by the coil in the pilot valve is too small, the pilot valve cannot operate, and then the main valve cannot operate, and the electromagnetic unloading valve will fail. The existence of electronic components such as wi...

AI Technical Summary

Problems solved by technology

[0002] At present, the hydraulic valves with the function of starting and unloading mostly adopt electromagnetic control. The structure of this type of hydraulic valve is complicated. Generally, due to the limitation of the power of the electromagnetic valve, this type of starting and unloading valve needs to be equipped with an electromagnetic pilot valve, which is controlled by the electromagnetic pilot valve. Main valve action

The action of the electromagnetic pilot valve is driven by the current. If the current is too low, the suction force generated by the coil in the pilot valve is too small, the pilot valve cannot operate, and then the main valve cannot operate, and the electromagnetic unloading valve will fail.

The existence of electronic components such as wires and coils reduces the reliability of the electromagnetic unloading valve

At the same time, because there are more dedicated control channels, the control platform is also more complicated

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