Should the control valve be tested upon arrival?
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This post was last edited by yangcoo98 on 2010-8-12 at 13:30. Don’t control valves need to undergo leakage tests, pressure resistance tests, and stroke tests? Specification SH3521-07 states that pressure resistance tests and leakage tests are required. The question now is that manufacturers generally conduct tests such as stroke, opening degree, pressure resistance, and leakage testing before shipping the products. So, are such tests still necessary after the products arrive? (The experienced workers say it’s necessary to do so, because the manufacturers aren’t entirely trustworthy.) ) But ordinary valves usually come with long warranty periods, so is it still necessary to conduct this test? GB50131-07 states that 30% sampling is required, and 100% in special environments.
Vibrations during transportation can affect the accuracy of adjustment; it is necessary to recalibrate it
Reputable manufacturers carry out thorough inspections before releasing products from the factory. Upon receipt, it is sufficient to first check for any issues with the appearance, and then verify the valve position; under normal circumstances, the product can be used straight away. If your supplier consistently provides products of high quality, you may skip the inspection step. However, if the quality is inconsistent and the valves are important, it’s better to conduct an inspection, as problems that arise after installation can be quite troublesome.
Voltage withstand tests and leakage tests must be carried out. Although manufacturers conduct such tests before shipping the products, it is difficult to ensure that the conditions remain the same after long-distance transportation. If these tests are not done, leaks may be detected only during operation, which will affect the project timeline
Through various tests prior to installation, relevant data is obtained to determine whether the valve’s performance meets the design requirements, thereby providing insight into potential issues that may arise during the commissioning of the system. This so-called experiment cannot be underestimated.
Yes, the valves still need to undergo pressure and leakage tests after being packed and transported to the site
Regardless of the manufacturer of the valves, testing must be carried out upon delivery. A rigorous engineering attitude must be maintained at all times.
As part of the handover procedure, it is necessary to conduct pressure and leakage tests on site.
How many of the current construction companies conduct pressure and leakage tests on valves? It’s expensive and troublesome. They certainly won’t produce the valves ordered by the factory itself.
Applying pressure to the control valves is something that construction companies must do. In several projects I’ve worked on, I encountered situations where the pressure applied to these valves was not sufficient. Imagine if problems are detected only when work is about to start – that would certainly be very troublesome；
I work at a valve factory; I’ve been in sales for many years, and occasionally I have to inspect one or two valves. The rest are basically not tested. I guess the contractors find it troublesome, and if it is used at all, it’s because there is no oversight from the users. However, once the valves arrive at the site (in quantities of 10 or more), after-sales support is usually provided on-site for their operation