44
Control systems Pressure reducing/surplussing valves
Interchangeability of spares The following table shows how in certain sizes some parts are interchangeable. For example in the line headed 'Main diaphragm' the diaphragm used in the screwed valves ½ " and ¾ " is common to these sizes by the letter 'a', the letter 'c' indicates that one diaphragm is common to the DN40 and DN50 valves. All spares are interchangeable with the DP27T and where marked † are interchangeable with the 37D temperature control. ** ** Note : This does not apply to the DP27G and DP27GY soft seat pilot valve or main valve assemblies.
Screwed
Flanged
Size DN
½"LC ½" ¾" 1" 15LC 15 20 25 32 40 50
Maintenance kit
a
a
a
b
f
f
a
b
c
d
e
Main diaphragm
a
a
a
b
a
a
a
b
b
c
c
†
Pilot diaphragms
a
a
a
a
a
a
a
a
a
a
a
Pilot valve chamber assembly
a
a
a
a
a
a
a
a
a
b
b
Pilot filter element
a
a
a
a
a
a
a
a
a
a
a
Pilot filter cap gaskets
a
a
a
a
a
a
a
a
a
a
a
PTFE seals
a
a
a
a
a
a
a
a
a
a
a
† † †
Main valve assembly
a
b
c
d
a
b
c
d
e
f
g
Internal strainer
a
a
a
b
f
f
a
b
c
d
e
4.6 180
Main valve return spring
a
a
a
a
a
a
a
a
a
c
c
Pressure adjustment spring
a
a
a
a
a
a
a
a
a
a
a
†
Control pipe assembly
a
a
a
b
f
f
a
b
c
d
e
Balance pipe assembly
a
a
a
b
f
f
a
b
c
d
e
†
Body gasket
a
a
a
a
a
a
a
a
a
b
b
Set of spring housing securing studs and nuts
a
a
a
a
a
a
a
a
a
b
b
† †
Set of main body studs and nuts
a
a
a
a
a
a
a
a
a
b
b
Set of diaphragm securing bolts and nuts
a
a
a
a
a
a
a
a
a
b
b
Pushrod and main diaphragm plate assembly
a
a
a
b
a
a
a
b
b
c
c
Not available for the DP27G or the DP27GY
TI-P470-01 CTLS Issue 13
Page 16 of 16
DP27, DP27E, DP27G, DP27GY, DP27R & DP27Y Pilot Operated Pressure Reducing Valves with SG Iron Bodies
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