ITT Skotch Trifecta T4405F, Инструкции по установке, эксплуатации и обслуживанию

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ITT
Engineered Valves, LLC Page 22 of 24
Technical Manual No. IOT4400F Effective 8/31/2018
REV LEVEL B
B. Outlet Valve POC Switch
1. Testing
a) Remove the outlet valve switch cover.
b) With the valve in the closed position, verify the normally open
contacts are made.
c) Very slowly open the valve until the normally open contacts are
open. At this point stop the movement of the actuator and verify
that flow has not commenced by pressurizing the vent with a
maximum pressure of 20 psig and monitoring flow from the outlet.
The actuator can be opened slowly by regulating the air pressure to
the actuator.
d) If there is evidence of flow the outlet valve switch needs to be
adjusted.
2. Setting
a) Verify the valve is in the closed position.
b) Loosen the two screws that hold the POC switch to the L-shaped
bracket.
c) While monitoring the normally open contacts, move the switch
downward towards the actuator top cap until the contacts are made.
From this point, move the switch an additional 1/32" to 1/16" and
tighten the switch mounting screws.
d) Cycle the valve open several times and confirm that the normally
open contacts are made when the valve is in the closed position. If
the contacts do not reset, then it is necessary to move switch
downward an additional 1/32". Repeat until the switch resets.
e) Open the valve fully and allow the actuator to close slowly while
monitoring the normally open contacts. When the switch trips,
verify that there is no flow across the outlet valve by pressurizing
the vent to 10 psig and monitoring flow out the outlet valve. If
there is evidence of flow before the normally open contacts are