Double pressure unloading valve

Abstract

The invention discloses a double pressure unloading valve and relates to the technical field of hydraulic pressure. The double pressure unloading valve includes a main valve, a low pressure control pilot valve, and a high pressure control pilot valve. The main valve comprises a main valve core and a one-way valve; the low pressure control pilot valve comprises a differential motion sliding valve core, a differential motion sliding valve sleeve, a ball valve core, and a low pressure pressure-regulating spring; the high pressure control pilot valve comprises a high pressure control sliding valvecore and a high pressure pressure-regulating spring; two ends of the differential motion sliding valve core have different diameters; and the differential motion sliding valve core is separately matched with the differential motion sliding valve sleeve, a low pressure control valve body, and the ball valve core to form three cavities and three pressure bearing areas. The double pressure unloadingvalve solves the problem that a commonly used unloading valve cannot set the high pressure and the low pressure separately, a pressure detecting element or an electric control element is not requiredto be introduced, and the reliability is further improved; and compared with the traditional unloading valve, the double pressure unloading valve has higher adaptability and wider pressure-regulationrange, better energy-saving effect can be achieved, and special requirements for use can be met.

Description

technical field [0001] The invention relates to the field of hydraulic technology, in particular to a dual-pressure unloading valve. Background technique [0002] The unloading valve is a pressure control valve commonly used in hydraulic systems. It is used in a hydraulic system with an accumulator. When the oil pressure of the accumulator reaches the high-pressure setting value, it can guide the oil at the outlet of the oil pump back to the oil tank without pressure. It can also be used in a high-low pressure pump system. When the system oil pressure reaches the high-pressure set value, it can guide the oil at the outlet of the low-pressure oil pump back to the oil tank without pressure. Pressurize the system. [0003] The common unloading valve in the industry is generally composed of two parts: the main valve and the pilot valve. The limitation of this type of valve is that the ratio of the high pressure setting value to the low pressure setting value is a fixed value, ...

AI Technical Summary

Problems solved by technology

[0003] The common unloading valve in the industry is generally composed of two parts: the main valve and the pilot valve. The limitation of this type of valve is that the ratio of the high pressure setting value to the low pressure setting value is a fixed value, and the ratio is equal to the inside of the unloading valve. The ratio of the pressure-bearing cross-sectional area of ​​the spool valve core to the ball valve core, so the high pressure and low pressure cannot be adjusted separately according to the needs of the site.

To solve this problem, an electromagnetic unloading valve can also be used instead, but it is necessary to introduce pressure detection components and electrical control components, which increases the complexity of the system and reduces the reliability.

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