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

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ITT
Engineered Valves, LLC Page 6 of 24
Technical Manual No. IOT4400F Effective 8/31/2018
REV LEVEL B
II. OPERATION
Refer to solenoid assembly nameplate or purchase order specifications to determine
appropriate line voltage and type. Operation is in accordance with referenced drawings.
Check specific order options and wiring diagrams (60-018 for AC voltage or 60-024 for
DC voltage) for electrical terminals supplied inside the junction box.
A. Open Block Valves (Close Vent)
T4405F, T4406F and T4407F valves follow similar opening protocol.
With pneumatic supply pressure regulated to a minimum of 70 psig and a
maximum of 120 psig, apply line voltage across terminal points 1 and 2 for AC
solenoids (Terminal points 18 and 19 for DC Solenoids) located in the junction
box. This energizes the pilot solenoid, allowing pneumatic pressure into the
cylinder.
As pressure is admitted to the cylinder, the outlet valve return spring is
compressed and the outlet valve plug moves out of its seat ring. Concurrently, a
cage slides down over a post until first a soft seal, and then a metal back-up seal is
made, closing the vent.
Upon vent closure, the piston continues to stroke. This pushes the inlet valve plug
out of its seat ring, compressing the inlet valve return spring. Stroking stops when
the actuator piston contacts a travel stop in the actuator section. Flow commences
only after the inlet plug clears its seat. Thus, no flow occurs until the vent is
positively closed.