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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. Spares which are marked † are interchangeable with the DP17 and DP27 pressure reducing valves. Spares marked 'o' are interchangeable with the 37D temperature control valve.
Screwed Flanged ½"LC ½" ¾" 1" 15LC 15 20 25 32 40 50
Size DN
Maintenance kit
a a a b
f
f
a b c
d e
† o † o † o
Main diaphragm
aaabaaabbc
c
Pilot diaphragm
aaaaaaaaaaa
Pilot valve assembly for pressure control unit
aaaaaaaaaaa
Pilot valve filter and gasket
aaaaaaaaaaa
o aaaaaaaaaaa o aaaaaaaaaaa
Pilot valve assembly for temperature control unit
Pilot valve packless gland set
† o † o † o
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
Main valve return spring
aaabaaabbc
c
† aaaaaaaaaaa o aaaaaaaaaaa o aaaaaaaaaaa
Pressure adjustment spring
4.6 164
Control head
'O' ring for sensor bulb adaptor
Control pipe assembly
a a a b
f
f
a b d e f
†
Balance pipe assembly
a a a b
f
f
a b c
d e
† aaaaaaaaabb
Gasket set
Pilot valve block gasket
aaaaaaaaaaa
† aaaaaaaaabb
Set of spring housing securing studs and nuts
† o † o
Set of main body studs and nuts
aaaaaaaaabb
Set of diaphragm securing bolts and nuts
aaaaaaaaabb
Set of temperature pilot valve housing Securing studs and nuts
aaaaaaaaaaa
o aaaaaaaaaaa
Set of adjustment head securing screws
TI-P470-08 CTLS Issue 5
Page 12 of 12
DP27T and DP27TE Pilot Operated Pressure/Temperature Control Valves with SG Iron Bodies
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