44
Control systems Pressure reducing/surplussing valves
Materials (continued) No. Part
Material
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) and 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
4.6 82
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
Cirlclip
Zinc plated steel
48
Spindle seal 'O' ring
EPDM or suffix 'N' Nitrile
49
Bearing bush
PTFE/steel composite
50
Housing seal 'O' ring
EPDM or suffix 'N' Nitrile
51
Vent plug
Plastic
52
Coupling clamp
Zinc plated steel
ASTM A216 Gr. WCB
53
Spring
Spring steel
BS 5216 Gr. M4
54 55 56
Clamp screw
Zinc plated steel
BS 4168 Gr. 12.9
Clamp plate
DN65 to DN100 only
Stainless steel
ASTM A276 316L
Clamp plate gasket
Reinforced exfoliated graphite
TI-P206-01 CTLS Issue 13
Page 6 of 13
DEP4 Cast Steel Excess Pressure Valve
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