Spirax Sarco DP27T Installation And Maintenance Instructions Manual page 32

5.9 How to renew the temperature control pilot valve assembly:
- Isolate the valve and zero the pressure. Remove the
sensor bulb and allow it to cool down,otherwise the
control system may be strained.
65. Undo the three screws and remove the temperature
control head.
66. Unscrew the packless gland housing (21 mm A/F)
and remove with the pushrod assembly and return
spring.
67. Unscrew the union and the release the
pipework.
68. Unscrew the nuts and remove the pilot
valve housing.
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