44
Control systems Pressure reducing/surplussing valves
Materials For part numbers 1 to 17, please go to page 2
No.
Part
Material
18 19 20
Spring(s)
Chrome Vanadium
Bush (part of 20)
PTFE/steel composite
Sealing bellows assembly
Stainless steel
AISI 316(L)
DN15 and DN20
Stainless steel 'S' type
21
Sealing bellows gasket
DN25 to DN100
Reinforced exfoiliated graphite
22
Clamp nut
DN25 to DN100
Steel zinc plated
BS 970 230 M07
DN32 to DN50
Steel zinc plated
BS 970 230 M07
25
Lock-nut
DN15 to DN25, DN65 to DN100
Steel zinc plated
BS 3692 Gr. 8
26
Spring plate
Steel zinc plated
BS 1449 Pt1 HR14
27
Needle bearing
Steel
28 29 30
Setting nut
Steel zinc plated
BS 970 230 M07
Bearing plate
DN32 to DN50
Steel zinc plated
BS 1449 Pt1 HR14
4.6 38
Circlip
DN32 to DN50
Steel zinc plated
31
Mounting plate
Steel zinc plated
BS 1449 Pt1 HR14
32
Housing
Types 1(N) to 4(N)
Steel
DIN 1514 St W24
Type 5(N)
Steel
BS EN 10025 S355 J2G3
Types 1(N)
Steel zinc plated
BS 3692 Gr. 5.6
33
Housing screws
Types 2(N), 3(N), 4(N) and 5(N)
Steel zinc plated
BS 3692 Gr. 8.8
Types 1(N)
Steel zinc plated
BS 3692 Gr. 5
34
Housing nuts
Types 2(N), 3(N), 4(N) and 5(N)
Steel zinc plated
BS 3692 Gr. 8
Diaphragm
EPDM fabric reinforced
35
Diaphragm suffix 'N'
Nitrile fabric reinforced
36
Hex. headed bolt
Stainless steel
BS 6105 A2
37
Sealing washer
Fibre
38 39 40
Diaphragm clamp
Stainless steel
ASTM A351 CF8M
Piston
Steel zinc plated
BS 1449 Pt1 HR14
Spindle
Steel zinc plated
BS 970 230 M07
41
Mounting nuts
Steel zinc plated
BS 3692 Gr. 8
42
Coupling
Steel zinc plated
43 44 45 46
Thread insert
DN15 and DN20
Stainless steel
DTD 734
Self-locking nut
DN25 to DN100
Stainless steel
BS 6105 A2
Clamp plate
DN65 to DN100
Stainless steel
ASTM A276 316L
Clamp plate gasket
DN65 to DN100
Reinforced exfoliated graphite
TI-P203-01 CTLS Issue 19
Page 4 of 11
DRV4 and DRV4G Cast Steel Pressure Reducing Valves
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