Torsion and bending resistance testing method for valves

Abstract

The invention relates to a torsion and bending resistance testing method for valves. The torsion and bending resistance testing method includes a valve torsion resistance safety performance testing process and a valve bending resistance safety performance testing process. A digital closed-loop control system is utilized, a servo drive force is output and loaded on a valve, and is fed back through a sensor, feedback signals are current feedback signals and sent into a regulator after being compared with a personal set values, and output control instruction is controlled and regulated by the regulator, sent to a servo control system, and finally the valve to be tested is tested according to the value set by test staff stably, so that precision and stability in test are improved greatly. Test results can be accurate in the torsion and bending resistance safety performance test processes by the torsion and bending resistance testing method.

Description

technical field [0001] The invention relates to a valve torsion and bending test method. Background technique [0002] Valve is a pressure pipeline component with high demand. It is widely used in various oil and natural gas exploration and other occasions, and plays an important role in stability, transportation and control. In recent years, the valve industry has developed very rapidly, but the quality assurance of valves is often neglected, resulting in frequent safety accidents. According to statistics, one-third of the major production accidents in the world every year are caused by valve quality accidents. Therefore, in order to further improve the quality level of valve products, strict checks should be carried out on valve quality inspection. At present, the valve inspection items include shell test, sealing test, life test, etc., through the test analysis of various performance parameters, the valve design technology The performance analysis of parameters and actu...

AI Technical Summary

Problems solved by technology

There are many method standards at home and abroad for valve internal medium pressure test, such as API598, JB / T9092-1999, etc. There are few domestic and foreign related research and test method standards for valve torque resistance and bending moment test, only GB / T 8464-2008 "Iron and Copper Threaded Connection Valves" and CJ / T180-2003 "Household Manual Gas Valves" standards mention the requirements for the safety performance of the valves on the valve's external torque force and bending moment load, but the specific test plan is relatively general, such as The accuracy requirements of the test instrument and the speed requirements of the force value applied by the test load are not specified

Valve enterprises generally use torque wrench to carry out valve torque resistance test. During manual operation, it is not easy to accurately grasp the time of force value preservation, and due to manual operation, it is difficult to ensure the uniformity of applied force value. The test process is relatively It is cumbersome and the loading and unloading is more complicated, so many companies often ignore the anti-torque test; the anti-bending moment test generally adopts the method of hanging weights. In this method, the hanging time of the weights is much longer than the test process during the hanging process of the weights, and The center of gravity of the simulated pipeline at the other end of the valve is not easy to calculate accurately, and it is easy to affect the judgment of the test results. The cantilever beam at the weight end tends to sag with the slight deformation of the valve, so the vertical moment arm passing through the center point of the valve also occurs. Change, the bending moment will also become smaller, and the measurement stability and accuracy cannot meet the test requirements

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