44
Control systems Pressure reducing/surplussing valves
Materials
1
4
3 5
7
2
6 (DN15 and DN20 only)
4.6 38
DN15 and DN20
DN25
No.
Part Body
Material Cast steel Cast steel
1 2 3
GP 240 GH
Bonnet
DIN 17425 GS C25
Valve seat
Stainless steel Stainless steel
BS 970 431 S29
DN15
4
Seat gasket
DN20 and DN25
Mild steel
DN32 to DN50
Reinforced exfoiliated graphite
DRV4
Stainless steel
BS 970 431 S29 BS 970 431 S29
5
Valve head
DRV4G (soft seated)
Stainless steel/Nitrile
6 7
Valve head screw
DN15 and DN20
Stainless steel
BS 6105 A2
Valve head seal
Arlon 1555
TI-P203-01 CTLS Issue 20
Page 4 of 15
DRV4 and DRV4G Cast Steel Pressure Reducing Valves
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