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Control systems Pressure reducing/surplussing valves
Safety information, installation and maintenance For full details see the Installation and Maintenance Instructions (IM-P004-05) supplied with the product. Installation note: The valve should be installed in a horizontal pipeline with the direction of flow as indicated by the arrow on the valve body. How to order Example: 1 off Spirax Sarco DN32 SDP143 pilot operated pressure surplussing valve fitted with a red pressure adjustment spring and having flanged EN 1092 PN40 connections.
Spare parts Available spares Maintenance kit A stand-by set of spares for general maintenance purposes and covers all spares marked* * Main diaphragm (2 off)
A B C
* Pilot diaphragm
(2 off)
Pilot valve seal assembly
* Pilot valve and plunger assembly
D, E
F, H
Main valve assembly
4.6 138
* Main valve return spring
G
Red
0.2 to 17 bar
J
Pressure adjustment spring
Grey
16 to 24 bar
* Control pipe assembly
K
* Body gasket
O
(packet of 3)
P
Set of spring housing securing studs and nuts
(set of 4)
Q
Set of pilot valve housing securing studs and nuts
(set of 4)
(set of 10)
DN15 and DN20
(set of 12)
DN25 and DN32
R
Set of diaphragm chamber securing bolts and nuts
(set of 16)
DN40 and DN50
(set of 20)
DN80
T
Set of main body studs and nuts (DN80)
(set of 6)
V, W, X
Pushrod and main diaphragm plate assembly
How to order spares Always order spares by using the description given in the column headed 'Available spares' and state the size and type of pressure reducing valve. Example: 1 - Main valve assembly for a Spirax Sarco DN15 SDP143 pilot operated pressure surplussing valve. How to fit: See Installation and Maintenance Instructions supplied with the pressure reducing valve. Further copies are available on request.
'Interchangeability of spares' is on page 12
TI-P004-01 CTLS Issue 8
Page 10 of 12
SDP143 Pilot Operated Pressure Surplussing Valve with Cast Steel Body
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