ITT
Engineered Valves, LLC
Page 17 of 22
Technical Manual No. IOT1000P Effective 8/31/2018
REV LEVEL B
5.
Actuator Reinstallation
Carefully place actuator onto valve. Screw yoke lock nut onto valve end
flange (Item 2) hand tight. Slide valve stem up and thread stem connector
onto actuator shaft. Rotate slowly until resistance is felt. Securely tighten
yoke lock nut. Make pneumatic and electrical connections to assembly and
stroke valve to "Purge" (Paragraph II.C). Rotate connector onto shaft one
additional turn plus enough to line up switch trip bracket mounting holes.
Tighten the jam nut, and fasten set screw located in the stem connector.
Close valve (Paragraph II.A) and install switch trip bracket and indicator
onto stem connector. The valve is now ready for testing.
6.
Test
Conduct the following tests to assure system performance is satisfactory
after rebuild.
a)
Valve Stroke
Verify no oil stem movement occurs when the valve strokes from
the Closed to Purge position. If the oil stem moves, thread stem
connector onto actuator shaft an additional turn while the valve is
in Purge and retest. Continue until no movement occurs.
b)
Auxiliary Open/Close Switches
Using an electrical testing device verify the Valve Closed limit
switch is actuated only when the valve is in the Closed position
and the Valve Open limit switch is actuated only when the valve is
in the Fire position. Ensure neither switch is actuated when in
Purge. Limit switches are adjusted by repositioning the switch
roller levers.
c)
Oil Valve Proof of Closure
The oil valve Proof of Closure switch must be adjusted in
accordance to Section VI.
