Passing valve screening check

A short screening check. It suggests the likely cause and the next step to confirm it. No data is collected or sent anywhere.

The full screening path in plain text

1. Screen first, then confirm. Close the valve fully. Watch downstream pressure, flow and sound. These signs suggest passing. Confirm with a proper seat test, such as pressure decay or a bleed check.
2. Check the gates. Injection needs fittings in good condition, a valve design that suits it, and permission from operations. Without these, get an assessment first.
3. If the valve is also hard to operate: screening points to debris and dried deposits. Where the gates pass, cleaner injection and careful cycling is the usual first step. Test the seat again after.
4. If it moves freely but still passes: screening points to seat surface damage or lost sealant. In suitable valves, cleaner then controlled sealant injection can restore the seal.
5. If correct injection has already failed, or damage is severe: sealant cannot bridge large damage. Plan repair or replacement, and take specialist advice on interim isolation.

The full background is in our guide: Passing valves: why a closed valve still leaks.