Pressure control method for pressure test medium capable of bilateral flow

Abstract

The invention discloses a pressure control method for a pressure test medium capable of bilateral flow and belongs to the technical field of hydraulic testing. According to the invention, the pressure increasing control process includes closing a water outlet stop valve and an unloading valve, opening a water inlet stop valve, a plunger moving to a front dead center, closing the water inlet stop valve, controlling the plunger to retreat to a rear dead center, advancing the plunger, automatically closing a water inlet valve, opening the water outlet stop valve and performing pressurizing, and repeating the operation until an object pressure is reached; a pressure maintaining control process includes a to-be-tested container requiring no constant pressure maintaining and requiring constant pressure maintaining; a pressure reduction control process includes the to-be-tested container requiring no pressure reduction process control and requiring pressure reduction process control, and when executes control of the pressure reduction process, the pressure reduction control process includes opening the water outlet stop valve, controlling the plunger to retreat, such that the working pressure and the pressure in the cavity of the plunger are equal and slow reduction is implemented during which process the movement of the plunger can be stopped at any time so as to conduct pressure maintaining in the process. According to the invention, the method can effectively execute control over pressure increasing speed and the pressure reduction speed, and has a control precision reaching +-0.02MPa.

Description

[0001] This application is a divisional application with an application date of December 10, 2014, an application number of 201410750927.7, and an invention title of "a pressure control system and method with bidirectional flow of pressure test medium". technical field [0002] The invention relates to the technical field of hydraulic testing, in particular to a pressure control technology that utilizes the two-way flow of the working medium of the plunger pump to effectively control the pressure increase rate and the pressure decrease rate or constant pressure. Background technique [0003] The pressure test technology is to inject the pressure test medium into the tested container by using the high-pressure source generating equipment (abbreviated as the host, hereinafter referred to as the host) to increase the pressure in the pressure test container, so as to test the strength and sealing performance of the pressure test container. . The steps generally include water inj...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to: aim at the above existing problems, to provide a pressure control method for the two-way flow of the pressure test medium, which mainly solves the technical problem that the existing technology is difficult to accurately control the boosting rate; also solves the existing The technology cannot effectively control the depressurization process, and cannot complete the sub-stage depressurization control technology problem after depressurization and pressure maintenance; it also solves the problem of the existing technology when the pressure is maintained, because the medium cannot flow in the opposite direction, and only has one-way supplementary pressure , does not have the technical problem of reducing the pressure to keep the system pressure constant; it also solves the technical problem that the pressure control accuracy in the existing technology is difficult to improve

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