Spirax Sarco 37D, Инструкция по установке и обслуживанию

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IM-P102-04 CTLS Issue 7
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To renew the pilot valve assembly
Isolate the valve and zero the pressure. If the plant is still in operation through a bypass valve or if the medium
surrounding the bulb is hot, withdraw the sensor bulb and allow it to cool down, otherwise the control system
may be strained.
1.
Undo the three screws and lift of the adjustment head.
2. Unscrew the packless gland housing (21 mm A/F) and remove with the push rod assembly and return
spring.
3.
Unscrew the union and release the pipework.
4. Unscrew the nuts and remove the pilot valve housing.
5. Ensure that the main valve return spring is still in position.
6. Unscrew and remove the pilot valve assembly (20 mm A/F).
7. Screw the new pilot valve into the housing.
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