Pressure test frock for electro-hydraulic servo valve body

Abstract

The present invention discloses a pressure test fixture used for electrohydraulic servo valve body, which includes a top surface sealing cover and a bottom surface sealing cover, wherein the bottom surface sealing cover can seal oil return port on lower end-face of the valve body and two load cavity ports with a helical burr blind hole that used to connect the high-pressure oil tube horizontally set on right side; an oil through hole that communicates with the helical burr blind hole and mounting screwed hole corresponding to mounting through hole of the valve body are vertically set on the central upper end face of the bottom surface sealing cover; the top surface sealing cover can seal the central locating hole and the load cavity port on upper end face of the valve body, and through hole corresponding to the mounting through hole of the valve body is set on end face of the top surface sealing cover; the valve body is held between upper end face of the bottom surface sealing cover and lower end face of the top surface sealing cover, and the oil through hole on the bottom surface sealing cover communicates with the oil inlet port on lower end face of the valve body. The fixture provided in the invention improves security of valve body greatly.

Description

Technical field [0001] The invention relates to a safety inspection tool for hydraulic components, in particular to a pressure test tool for an electro-hydraulic servo valve body. Background technique [0002] The development of electro-hydraulic servo valves in the international professional field has gone through more than 50 years, and the applications have become more and more extensive. However, the research and manufacturing of domestic servo valves are still in a relatively backward state, and the technical level of parts assembly and assembly is also far behind foreign countries. The work of the servo valve relies on the pressure difference between the two chambers of the pre-stage to realize the displacement of the spool to achieve the required output flow. At the same time, the servo valve works in a high-pressure oil environment. In order to achieve industrial safety, we must implement pressure tests on valve bodies and other related parts to meet our requirements. [...

AI Technical Summary

Problems solved by technology

[0003] The electro-hydraulic servo valve works under the pressure of 21Mpa. Under such a high pressure, it is very difficult to detect the potential damage to the valve body such as bubbles and cracks in the valve body.

Generally, it is time-consuming and labor-intensive to detect with instruments and the cycle is long

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