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KENT INTROL
SUPPORT
SEAT LEAKAGE
TESTING
- CONTROL VALVES ARE NOT USUALLY ASSOCIATED WITH TIGHT SHUT-OFF AND SEAT TESTS ARE PERFORMED TO ANSI FCI 70-2:-
- ALLOWABLE LEAKRATES:-
- CLASS II = 0.5% OF VALVE FULL CAPACITY
- CLASS III = 0.1% OF VALVE FULL CAPACITY
- CLASS IV = 0.01% OF VALVE FULL CAPACITY
- CLASS V = 5 X 10-4 CC/MIN OF WATER PER INCH OF PORT DIAMETER PER PSI DIFFERENTIAL
- CLASS VI IS TESTED USING AIR OR NITROGEN AT LOW PRESSURE AND, IN THE CASE OF SMALL VALVES, THE LEAKAGE IS MEASURED IN BUBBLES FROM A SPECIFIED TUBE SIZE OR IN A WATER CYLINDER.
