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5. Maintenance
Note: Before actioning any maintenance programme observe the 'Safety
information' in Section 1.
Warning:
The body gasket (all DP27 derivatives) and actuating chamber gasket (DP27R)
contains a thin stainless steel support ring which may cause physical injury if not
handled and disposed of correctly.
5.1 Routine maintenance
It is recommended that the valve is dismantled once every twelve to eighteen months for a
complete overhaul and ideally this should be carried out with the valve removed from the line.
The following parts should be
inspected and refurbished or
replaced as necessary:
-
Main valve seat and valve head.
-
Pilot valve assembly.
-
Pilot filter element.
-
Internal strainer screen.
-
Main diaphragms.
-
Pilot diaphragms.
Pilot
diaphragms
Main
diaphragms
Main valve seat
and valve head
Internal strainer
screen
Pilot filter element
Body gasket
Pilot valve assembly
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