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Control systems Pressure reducing/surplussing valves
Materials No. Part
Material
1 2 3
Body
Cast steel
GP 240 GH
Bonnet
Cast steel
DIN 17245 GSC25
Valve seat
Stainless steel
BS 970 431 S29
DN15
Stainless steel
4
Valve seat gasket
DN20 and DN25
Mild steel
DN32 to DN50
Reinforced exfoliated graphite
5 6 7 8 9
Valve head
Stainless steel
BS 970 431 S29
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
AISI 316L
11
Balancing bellows gasket
DN25 to DN100
Reinforced exfoliated graphite
12 13
Bonnet gasket
Reinforced exfoliated graphite
4.6 80
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
Zinc plated steel
BS 970 230 M07
16
Pillar nuts
Zinc plated steel
BS 3693 Gr. 8
17
Spring adjuster
Zinc plated cast iron
DIN 1691 GG25
18 19 20
Spring(s)
Chrome vanadium
Bearing bush (part of item 20)
PTFE/steel composite
Sealing bellows assembly
Stainless steel
AISI 316L
DN15 and DN20
Stainless steel 'S' type
21
Sealing bellows gasket
DN25 to DN100
Reinforced exfoliated graphite
22
Clamp nut
DN25 to DN100
Zinc plated steel
BS 970 230 M07
25
Lock-nut
Zinc plated steel
BS 970 230 M07
26
Spring plate
Zinc plated steel
BS 1449 Pt 1 HR14
27
Needle bearing
Steel
28 29 30
Setting nut
Zinc plated steel
BS 970 230 M07
Bearing locator
Zinc plated steel
BS 970 230 M07
Adjuster sleeve
Zinc plated steel
31
Mounting plate
Zinc plated steel
BS 1449 Pt 1 HR14
TI-P206-01 CTLS Issue 13
Page 4 of 13
DEP4 Cast Steel Excess Pressure Valve
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