44
Control systems Pressure reducing/surplussing valves
Materials (continued)
Steel zinc plated Steel zinc plated Steel zinc plated
DN32 to DN50
BS 970 230 M07
25 Lock-nut
DN15 to DN25, DN65 to DN100
BS 3692 Gr. 8
26 Spring plate
BS 1449 Pt1 HR14
44
27 Needle bearing
Steel
Steel zinc plated Steel zinc plated
28 Setting nut
BS 970 230 M07
29 Bearing plate DN32 to DN50
BS 1449 Pt1 HR14
30 Circlip
DN32 to DN50 Steel zinc plated
Steel zinc plated
31 Mounting plate DN25 to DN50
BS 1449 Pt1 HR14
Types 1(N) to 4(N)
Steel
DIN 1514 St W24
32 Housing
BS EN 10025 S355 J2G3
Type 5(N)
Steel
4.6 50
Steel zinc plated Steel zinc plated Steel zinc plated Steel zinc plated
Types 1(N)
BS 3692 Gr. 5.6
33 Housing screws
Types 2(N), 3(N), 4(N) and 5(N)
BS 3692 Gr. 8.8
Types 1(N)
BS 3692 Gr. 5
34 Housing nuts
Types 2(N), 3(N), 4(N) and 5(N)
BS 3692 Gr. 8
25
Diaphragm
EPDM fabric reinforced
27 26 40 41 32
35
Diaphragm suffix 'N'
Nitrile fabric reinforced
31 28
Stainless steel
36 Hex. headed bolt
BS 6105 A2
37 Sealing washer
Fibre
Stainless steel Steel zinc plated Steel zinc plated Steel zinc plated
38 Diaphragm clamp
ASTM A351 CF8M
33 34 39
39 Piston
BS 1449 Pt1 HR14
42
40 Spindle
BS 970 230 M07
41 Mounting nuts
BS 3692 Gr. 8
35 38 37 36
DN25
42 Coupling
Steel zinc plated
Stainless steel Stainless steel
43 Thread insert
DN15 and DN20
DTD 734
44 Self-locking nut DN25 to DN100
BS 6105 A2
TI-P204-01 CTLS Issue 15
Page 4 of 10
DRV7 and DRV7G SG Iron Pressure Reducing Valves
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