Regarding valve pressure testing
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According to SH3518, valves with a pressure of less than 1.0 MPa and a diameter of DN600 or larger do not require separate pressure testing; they can be tested along with the pipeline. At our construction site, however, there is a butterfly valve with a diameter of DN1000 and a pressure rating of PN1.0 MPa, and it is supposed to be tested on-site. But our testing equipment is only capable of testing valves up to DN500. Do any of you have any good suggestions? Also, do valves fitted by socket welding also need to be pressure-tested separately? What about those high-pressure socket valves?
If pressure testing is required, a flange-mounted blind plate can only be used for that purpose.
Valve pressure testing should be determined based on specific circumstances. For example, in the case of the most commonly used gate valves, it is necessary to create molds based on the valve’s pressure rating, and then conduct pressure testing in accordance with relevant standards.