44
Control systems Pressure reducing/surplussing valves
Materials (continued)
15
21
4.6 24
17
16
25
18 20 19 26
24
23
22
No.
Part
Material
15
Locking pin
Copper
16*
Head (incorporating seal Pt No.27)
Stainless steel
BS 970 431 S29
17
Screen
Stainless steel
316L
18 19 20
Lower pushrod
Stainless steel
BS 970 431 S29
End cap
SG iron
DIN 1693 GGG 40.3 ELNP coated
Screw
Zinc plated steel
BS 3692 Gr. 8.8
21
Screw
Zinc plated steel
BS 3692 Gr. 8.8
22
Washer
Stainless steel
BS 1449 304 515
23
Guide bush
PTFE 15% graphite filled
24
Return spring
Stainless steel
BS 2056 316 S42
25
PTFE washer
Virgin PTFE
BS 6564 Type 2 Gr. B
26
'O' ring seal
EPDM
E 0962-90
27*
Head 'O' ring seal
EDPM
E 0962-90
*Note: Parts 16 and 27 are not shown.
TI-P210-01 CTLS Issue 6
Page 4 of 7
BRV71 and BRV73 SG Iron Pressure Reducing Valves
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