Most international valve standards require that valves not be subjected to external clamping forces before application of the test pressure.
Control and Shut Off Valve Test
Most international valve standards require that valves not be subjected to external clamping forces before application of the test pressure.
Automatic sealing heads used by Metrus, converts the introduced test pressure mechanically into clamping pressure and thus allows the smooth rise of the clamping pressure parallel to the test pressure.