Passive overpressure relief valve

Abstract

The invention discloses a passive overpressure unloading valve which comprises a valve body and a valve element arranged in the valve body in a sliding mode, the valve element is sequentially provided with a first hydraulic drive portion, a second hydraulic drive portion and a third hydraulic drive portion in the axial direction, the valve body is provided with a first pressure oil cavity communicated with a low-pressure oil circuit of a hydraulic system, a second pressure oil cavity communicated with a high-pressure oil circuit of an execution element and a third pressure oil cavity communicated with the low-pressure oil circuit of the hydraulic system, the drive direction of the second hydraulic drive portion and the drive direction of the third hydraulic drive portion are the same and are opposite to the drive direction of the first hydraulic drive portion, the oil pressure action area of the first hydraulic drive portion is larger than the sum of the oil pressure action area of the second hydraulic drive portion and the oil pressure action area of the third hydraulic drive portion, and the valve element enables the high-pressure oil circuit of the execution element to be connected with or disconnected from the low-pressure oil circuit of the hydraulic system in a sliding mode. The passive overpressure unloading valve has the advantages of being simple in structure, easy to manufacture, flexible in motion, safe and reliable in use, convenient to control and the like.

Description

technical field [0001] The invention relates to a hydraulic valve, in particular to a passive overpressure unloading valve. Background technique [0002] Metal extrusion and forging technology is a method of pressure processing using the principle of metal plastic forming. The pretreated metal blank is put into the mold, and then pressure is applied to the metal blank to deform the metal blank and fill the mold cavity, thereby Get the parts you need. Metal extrusion and forging technology is an advanced technology with less cutting or no cutting, which is conducive to improving the quality of products, improving the internal microstructure and performance of products, and also has the advantages of material saving, low energy consumption, wide application range and flexible production It has the characteristics of high reliability, simple process flow and low investment in equipment. [0003] At present, there are still many technical problems in extrusion forging technolo...

AI Technical Summary

Problems solved by technology

However, there are not many hydraulic components to choose from in existing extrusion forging equipment, especially for system pressure relief. The existing unloading valve cannot completely avoid the occurrence of pressure holding when used in extrusion forging equipment. Suppressing pressure is very likely to cause damage to hydraulic components, and high-pressure oil ejection is also likely to cause casualties, posing a major safety hazard

Moreover, in the existing extrusion and forging equipment, the combined valve group is used for pressure relief, which has problems such as complex structure, difficult control, insensitive action, and prone to failure.

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