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 following sizes: DN15LC, DN15 and DN20 is common to these sizes by the letter 'a'. The letter 'b' indicates that sizes DN25 and DN32 use one common diaphragm. Some parts, particularly pilot and main valve assemblies are specific to particular models e.g 'SDP' 'G'. Interchangeability is therefore restricted to model type for some parts. † Please note for storage purposes: The spare parts marked † are not of the same material as those for the DP143 and DP163, consequently, they are not compatible for interchangeability.
Size
DN15LC DN15 DN20 DN25 DN32 DN40 DN50 DN80
Main diaphragm
a
a
a
b
b
c
c
d
Pilot diaphragm
a
a
a
a
a
a
a
a
Pilot valve seal assembly
a
a
a
a
a
a
a
a
Pilot valve and plunger assembly
a
a
a
a
a
a
a
a
Main valve assembly
a
b
c
d
e
f
g
h
Main valve return spring
a
a
a
b
b
c
c
d
Pressure adjustment spring
a
a
a
a
a
a
a
a
Control pipe assembly
† † †
a
a
b
c
d
e
f
g
Body gasket
a
a
a
b
b
c
c
d
4.6 140
Set of spring housing securing studs and nuts
a
a
a
a
a
a
a
a
Set of pilot valve housing securing studs and nuts † Set of diaphragm chamber securing bolts and nuts †
a
a
a
b
b
c
c
d
a
a
a
b
b
c
c
d
Set of main body studs and nuts
†
−
−
−
−
−
−
−
a
TI-P004-01 CTLS Issue 8
Page 12 of 12
SDP143 Pilot Operated Pressure Surplussing Valve with Cast Steel Body
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