Wafer check valve no pressure leakage
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Dear experts, please take a look at the following pictures to help confirm the cause of the leakage of this wafer check valve. The factory says this wafer check valve leaks when there is no pressure. Is this statement reasonable? Thanks
The check valve of this structure will leak. You can consider H71 check valve
Thank you, the problem is the H76 structure.
All check valves will leak when pressure is low. When the pressure is high, the leakage is smaller. Please refer to the relevant valve inspection specifications for details. Valve inspection and testing specifications such as API, GB, sh, etc.
It will leak, even if the pressure is reached, but there is a reference amount, you can see API598
This kind of check valve is allowed to leak even when it is new from the factory, but the leakage amount meets the relevant inspection standards and can also meet the requirements for on-site use. Because the function of the check valve is to prevent the medium from flowing back, not to cut it off. As long as it is used normally on site, there will be no problem.