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5. Maintenance
Note: Before actioning any maintenance programme observe the 'Safety
information' in Section 1.
Warning:
The body gasket (all DP17 derivatives) and actuating chamber gasket (DP17R)
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 chamber assembly.
-
Main valve screen.
-
Main diaphragms.
-
Pilot diaphragms.
Pilot diaphragms
Main
diaphragms
Main valve seat
and valve head
Main valve screen
Pilot valve
chamber assembly
Body gasket
(see warning above)
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