44
Control systems Pressure reducing/surplussing valves
Materials (continued)
Arrangement of main valve assembly as used in sizes DN40 and DN50 .
DN15 to DN50
13
16
17
21
13
15 14
17 16
20 18
4.6 132
23
22
No.
Part
Material
13 14 15 16
Pilot valve and seat unit
Stainless steel
Internal strainer
Stainless steel
Body gasket
Stainless steel reinforced exfoliated graphite
Main valve return spring
Stainless steel
17
Main valve
Stainless steel
18
Main valve seat
Stainless steel
20
Main valve body
Cast steel
Securing nuts
Steel
Steel DN15 and DN20
21
M10 x 25 mm
Pilot valve housing
Securing studs
DN25 to DN50
M12 x 30 mm
DN80
M12 x 40 mm
22
Main diaphragm chamber
Cast steel
For DN80 parts, see page 6
TI-P004-01 CTLS Issue 8
Page 4 of 12
SDP143 Pilot Operated Pressure Surplussing Valve with Cast Steel Body
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