Submittal Sheet
Available Models
Suffix:
NRS – non-rising stem, resilient seated gate valves
OSY – UL/FM outside stem and yoke resilient seated gate
valves
BFG – UL/FM grooved gear operated butterfly valves with
tamper switch
QT – 2
1
⁄2" and 3" (65 and 80mm) quarter-turn ball valves
*OSY FxG – Flanged inlet gate connection and grooved outlet
gate connection
*OSY GxF – Grooved inlet gate connection and flanged outlet
gate connection
*OSY GxG – Grooved inlet gate connection and grooved outlet
gate connection
Available with grooved NRS gate valves - consult factory*
Post indicator plate and operating nut available - consult factory*
*Consult factory for dimensions
Note: When installing a drain line on Series 957 backflow preventers,
use 957AG air gaps. See ES-AG/EL/TC for additional information.
Dimensions — Weight
Materials
Housing & Sleeve: 304 (Schedule 40) Stainless Steel
Elastomers: EPDM, Silicone and Buna-N
Torsion Spring Checks: Noryl
®
, Stainless Steel
Check Discs: Reversible Silicone or EPDM
Test Cocks: Bronze Body Nickel Plated
Pins & Fasteners: 300 Series Stainless Steel
Springs: Stainless Steel
Pressure — Temperature
Temperature Range: 33°F – 110°F (5°C – 43°C)
Maximum Working Pressure: 175psi (12.06 bar)
Approvals
A
D
C (open)
G
H
J
I
P
M
G
H
J
I
P
957
957BFG
SIZE (DN) DIMENSIONS WEIGHT
AC (OSY) C (NRS) D G H I J M P 957NRS 957OSY 957N NRS 957N OSY
in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm lbs. kgs. lbs. kgs. lbs. kgs. lbs. kgs.
2
1
⁄
2
65 31 787 16
3
⁄
8
416 9
3
⁄
8
238 6
1
⁄
2
165 29
1
⁄
16
738 22 559 15
1
⁄
2
393 8
13
⁄
16
223 21
9
⁄
16
548 9
3
⁄
16
234 118 54 128 58 126 57 136 62
38031
11
⁄
16
805 18
7
⁄
8
479 10
1
⁄
4
260 6
11
⁄
16
170 30
1
⁄
4
768 22
3
⁄
4
578 17
1
⁄
8
435 9
3
⁄
16
233 23
1
⁄
8
587 10
1
⁄
2
267 134 61 148 67 147 67 161 73
4 100 33
11
⁄
16
856 22
3
⁄
4
578 12
3
⁄
16
310 7 178 33 838 24 610 18
1
⁄
2
470 9
15
⁄
16
252 26
1
⁄
2
673 11
3
⁄
16
284 164 74 164 74 187 85 187 85
6 150 43
1
/
2
1105 30
1
⁄
8
765 16 406 8
1
⁄
2
216 44
3
⁄
4
1137 33
3
⁄
4
857 23
3
⁄
16
589 13
1
⁄
16
332 32
3
⁄
4
832 15 381
276 125 298 135 317 144 339 154
8 200 50 1270 37
3
⁄
4
959 19
15
⁄
16
506 9
11
⁄
16
246 54
1
⁄
8
1375 40
5
⁄
8
1032 27
7
⁄
16
697 15
11
⁄
16
399 37
1
⁄
8
943 17
3
⁄
16
437
441 200 483 219 516 234 558 253
10 250 57
1
⁄
2
1460 45
3
⁄
4
1162 23
13
⁄
16
605 11
3
⁄
16
285 66 1676 50 1270 32
1
⁄
2
826 17
5
⁄
16
440 46
3
⁄
8
1178 20 508
723 328 783 355 893 405 950 431
SIZE (DN) DIMENSIONS WEIGHT
GHIJMP957N/957Z
in. mm in. mm in. mm in. mm in. mm in. mm in. mm lbs. kgs.
2
1
⁄
2
65 32
1
⁄
2
826 23
1
⁄
2
597 15
1
⁄
2
394 9
1
⁄
2
241 21
13
⁄
16
555 11
13
⁄
16
300
67 30
380 34 864 24
1
⁄
2
622 16
5
⁄
16
414 10
1
⁄
16
256 23
1
⁄
8
587 12
1
⁄
8
308
70 32
4 100 35
5
⁄
8
905 26 660 17
3
⁄
16
437 10
15
⁄
16
279 24
15
⁄
16
634 12
5
⁄
8
321
87 39
6 150 46
1
⁄
2
1181 35
12
⁄
16
908 20
1
⁄
2
521 13
1
⁄
2
343 28
1
⁄
4
718 15 382
160 73
Noryl
®
is a registered trademark of General Electric Company.
M
1013 B64.4
(BFG & OSY only)