Water pressure testing device for valves and test method thereof

Abstract

The invention discloses a water pressure testing device for valves, a support plate is installed at the end part of a piston rod, fine-tuning oil cylinders are installed on the support plate, pressuretesting right flanges are installed on the fine-tuning oil cylinders, pressure sensors are installed between the pressure testing right flanges and the fine-tuning oil cylinders, a control device comprises four parts including a display screen operation platform, a hydraulic control module, an acoustic emission signal processing module and a water pressure control module, the hydraulic control module is used for controlling oil to enter into and drain out from a rod port and a head port in a hydraulic cylinder, an acoustic emission signal processing system which leads out a group of acousticemission sensors attached onto a valve housing is installed in the acoustic emission signal processing module, and the water pressure control module controls an electrically operated reversing valve thereof to relieve the pressure of the system. The invention enable users to detect active crack defects and detailed leakage points and judge crack size and leakage degree through the acoustic emission sensors of the device, so as to ensure that the flanges are sealed without leaking.

Description

technical field [0001] The invention belongs to valve hydraulic test equipment and a test method. Background technique [0002] Valves need to carry out hydrostatic tests in the process of manufacturing, field installation, and in-service testing. The existing valve hydraulic test equipment has a single function, and can only perform hydrostatic pressure sealing tests and shell strength tests on valves. The results are judged based on Whether there is leakage, rupture, and whether the pressure drop exceeds the standard, etc., it is impossible to make an in-depth judgment on the defect and the location of the leakage point, especially the specific leakage point of the gland and the valve stem cannot be judged during the sealing test. Acoustic emission testing technology is a non-destructive testing method to evaluate material performance by analyzing the active defect signal of the material. During the hydrostatic test of the valve, the acoustic emission technology can be use...

AI Technical Summary

Problems solved by technology

For some large-diameter high-pressure valves, the thrust on the pressure test flange during the pressure test reaches more than 1,000 tons. If the parallelism of the flanges at both ends of the valve is not enough, no matter how much thrust is applied, it may leak

In order to ensure the success of the pressure test, on the one hand, the thrust of the pressure test system is required to be sufficient, resulting in a larger overall structural size; on the other hand, the parallelism of the flanges of large-diameter valves is particularly high.

[0004] "A hydraulic test bench for ultra-high pressure valves" (publication number CN105300805A); "valve pressure testing device" (publication number CN107044910A) and "valve pressure testing machine" (publication number CN106989871A), etc. These patents correspond to valve devices with single functions , can only carry out hydrostatic pressure test to judge the leakage and damage of the valve, does not have the function of acoustic emission detection, and cannot automatically release pressure by monitoring crack expansion to ensure the safety of equipment and personnel

In addition, the above-mentioned patents all push the flange plate through the screw rod or the piston rod to apply the pre-tightening force, or use the three-jaw chuck to apply the opposite direction force. For large-diameter high-pressure valves with insufficient parallelism of the flange surfaces at both ends, the method The local plugging of the flange can only be done by further increasing the horizontal pre-tightening force of the flange, and there are certain limitations in applying pressure

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