Spirax Sarco DP27T Installation And Maintenance Instructions Manual page 27

5.8 How to service or renew the main valve and seat:
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Isolate the valve and zero the pressure. Remove the sensor bulb and allow it to cool
down, otherwise the control system may be strained. Follow Steps 1 to 5 then proceed
as follows:
38. Undo the three screws and remove the temperature control head.
39. Unscrew the unions and release the pipework.
40. Unscrew the nuts and remove the pilot valve housings complete with the spring housing
assembly.
41. Remove the screen and clean.
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