44
Control systems Pressure reducing/surplussing valves
Pressure/temperature limits
A
B
C
Body design conditions
PN40
Maximum design pressure
40 bar g @ 50 °C
Steam saturation curve
DRV4 300 °C @ 25.8 bar g DRV4G 90 °C @ 37.3 bar g
Maximum design temperature
F
F
E
D
Minimum design temperature
0 °C
Pressure bar g
DRV4 300 °C @ 25.8 bar g DRV4G 90 °C @ 37.3 bar g
Maximum operating temperature
The product must not be used in this region.
Minimum operating temperature 0 °C Note: For lower operating temperatures consult Spirax Sarco
A-C-D Flanged EN 1092 PN40 and ASME 300.
A-B-E Flanged ASME 150.
DN15 - DN50
25 bar
Maximum differential pressure
DN65 - DN100 20 bar Designed for a maximum cold hydraulic test pressure of 60 bar g Note: With internals fitted, test pressure must not exceed 40 bar g
F-F The DRV4G is limited to 90 °C.
4.6 36
Materials
No.
Part
Material
1 2 3
Body
Cast steel
GP 240 GH
Bonnet
Cast steel
DIN 17425 GS C25
Valve seat
Stainless steel
BS 970 431 S29
DN15
Stainless steel
4
Seat gasket
DN20 and DN25
Mild steel
DN32 to DN50
Reinforced exfoiliated graphite
DRV4
Stainless steel
BS 970 431 S29
5
Valve head
DRV4G (soft seated)
Stainless steel/Nitrile
BS 970 431 S29
6 7 8 9
Valve head screw
DN15 and DN20
Stainless steel
BS 6105 A2
Valve head seal
Arlon 1555
Bush
DN15 and DN20
Stainless steel
BS 970 431 S29
Bush (part of item 10)
DN25 to DN100
Stainless steel
BS 970 431 S29
10
Balancing bellows assembly DN25 to DN100
Stainless steel
AISI 316 (L)
11
Balancing bellows gasket
DN25 to DN100
Reinforced exfoiliated graphite
12 13
Bonnet gasket
Reinforced exfoiliated graphite
Bonnet nuts
Steel
DIN 267 Pt13 Gr. 8
DN15 to DN40
M10
14
Bonnet studs
DN50 and DN65
M12
Steel
DIN 267 Pt13 Gr. 8.8
DN80 and DN100
M16
15
Pillars
Steel zinc plated
BS 970 230 M07
16
Pillars nuts
Steel zinc plated
BS 3693 Gr. 8
17
Spring adjuster
Cast iron zinc plated
DIN 1691 GG 25
TI-P203-01 CTLS Issue 19
Page 2 of 11
DRV4 and DRV4G Cast Steel Pressure Reducing Valves
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