ITT
Engineered Valves, LLC
Page 18 of 22
Technical Manual No. IOT1000P Effective 8/31/2018
REV LEVEL B
V. Leak
Testing
After assembly, the Skotch Trifecta Valve should be leak tested to verify proper
operation as follows:
A.
Atomizing Seat
1.
Place the valve in the Closed position.
2.
The fuel inlet and outlet ports must be plugged so that test media cannot
escape for these ports.
3.
Pressurize the atomizing inlet to 50 PSIG (344.7 KPa) air while
monitoring the leakage rate from the atomizing outlet. The leakage rate
should not exceed ANSI Class IV limits or 1254 cc/min.
4.
If leakage is excessive, stroke the valve 10 to 20 times to allow the metal
seat to wear in with the metal plug and retest the valve. If valve leakage is
still excessive, the main stem and seat should be replaced and the valve
retested.
Note: If the actuator was removed anytime prior to testing, the actuator/valve
coupling nut should be checked for proper installation. The atomizing
stem closure force is due to the return spring located inside the actuator. If
the coupling nut is not adjusted correctly it is possible for the actuator to
reach its home position without the atomizing plug contacting the seat. If
this occurs atomizing seat leakage will take place regardless of the plug
and seat condition. The atomizing seat and plug should limit the actuator
travel in the Closed position.
B.
Purge Seat
1.
Stroke the valve to the Fire position using a control pressure between 70
and 120 PSIG (482.6 - 827.4 KPa).
2.
The atomizing outlet and fuel inlet should be plugged to keep the test
media from escaping from these ports.
