UK Product Handbook 2026 - Volume 1

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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