Control systems Pressure reducing/surplussing valves
4
Materials (continued)
No. Part
Material Stainless steel Stainless steel / Nitrile Stainless steel
DRV7
BS 970 431 S29
Valve head
5
DRV7G (soft seated)
BS 970 431 S29
5
Valve head screw
DN15 and DN20
7
BS 6105 A2
6
*
11
9
Valve head seal
Arlon 1555
7
12 2 10
DN15 and DN20
Stainless steel Stainless steel
Bush
BS 970 431 S29
8
14 13
*
Bush (part of item 10)
DN25 to DN100
BS 970 431 S29
9
Balancing bellows assembly
17
DN25 to DN100
Stainless steel
AISI 316 (L)
10
20
Balancing bellows gasket
DN25 to DN100
Reinforced exfoiliated graphite Reinforced exfoiliated graphite
18
11
4.6 49
12 Bonnet gasket
13 Bonnet nuts
Steel
DIN 267 Pt13 Gr. 8
DN15 to DN40
M10
22 21
DN50 and DN65 DN80 and DN100
14 Bonnet studs
M12
Steel
DIN 267 Pt13 Gr. 8.8
19
M16
Steel zinc plated Steel zinc plated Cast iron zinc plated
15 Pillars
BS 970 230 M07
16 Pillars nuts
BS 3693 Gr. 8
17 Spring adjuster
DIN 1691 GG25
18 Spring(s)
Chrome Vanadium
19 Bush (part of 20)
PTFE / steel composite
Stainless steel
20 Sealing bellows assembly
AISI 316(L)
DN25
DN15 and DN20
Stainless steel 'S' type
Sealing bellows gasket
21
DN25 to DN100 DN25 to DN100
Reinforced exfoiliated graphite
* Please note: Parts numbered 10 and 11 are for DN25 to DN100 only
Steel zinc plated
22 Clamp nut
BS 970 230 M07
TI-P204-01 CTLS Issue 15
Page 3 of 10
DRV7 and DRV7G SG Iron Pressure Reducing Valves
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