44
Control systems Pressure reducing/surplussing valves
Materials (continued)
No.
Part
Material
16
Pillars 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
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
4.6 68
31
Mounting plate (not shown)
Zinc plated steel
BS 1449 Pt 1 HR14
Types 11(N) to 14(N)
Steel
DIN 1514 St W24
32
Housing
Type 15(N)
Steel
BS EN 10025 S355 J2G3
Types 11(N) to 12(N)
Zinc plated steel
BS 3692 Gr. 5.6
33
Housing screws
Types 13(N), 14(N) and 15(N)
Zinc plated steel
BS 3692 Gr. 8.8
Types 11(N) to 12(N)
Zinc plated steel
BS 3692 Gr. 5.6
34
Housing nuts
Types 13(N), 14(N) and 15(N)
Zinc plated steel
BS 3692 Gr. 8
35 36
Spindle guide
Stainless steel
BS 970 431 S29
Diaphragm
EPDM fabric reinforced or suffix 'N' Nitrile fabric reinforced
37
Hexagon headed bolt
Stainless steel
BS 6105 A2
38 39 40
Sealing washer
Fibre
Diaphragm clamp
Stainless steel
ASTM A351 CF8M
Piston
Zinc plated carbon steel
BS 1449 Pt 1 HR14
41
Spindle
Zinc plated carbon steel
BS 970 230 M07
42
Mounting nuts
Zinc plated steel
BS 3692 Gr. 8
43 44 45 46
Coupling
Zinc plated steel
Thread insert
DN15 and DN20
Stainless steel
DTD 734
Self-locking nut
DN25 to DN100
Zinc plated steel
BS 1449 CR4
Washer
Type 12(N) only
Zinc plated steel
BS 1449 CR4
47
Circlip
Zinc plated steel
48
Spindle seal 'O' ring
EPDM or suffix 'N' Nitrile
49
Bearing bush
PTFE/steel composite
TI-P205-01 CTLS Issue 12
Page 4 of 11
DEP7 SG Iron Excess Pressure Valve
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