Materials, Pressure — temperature, Approvals available models – Watts 957Z User Manual
Page 2: 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 – 140°F (0.5°C – 60°C)
Maximum Working Pressure: 175psi (12.1 bar)
Approvals
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
" - 4" (65 - 100mm) 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
M
G
H
J
I
P
957
957BFG
SIze (DN)
DIMeNSIoNS
WeIGHT
A
C (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 21
1
⁄
2
546 15
1
⁄
2
393 8
13
⁄
16
223 21
9
⁄
16
548 9
3
⁄
16
234 118 54 128 58 126 57 136 62
3 80 31
11
⁄
16
805 18
7
⁄
8
479 10
1
⁄
4
260 6
11
⁄
16
170 30
1
⁄
4
768 22
1
⁄
4
565 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
1
/
2
851 22
3
⁄
4
578 12
3
⁄
16
310 7 178 33 838
23
1
⁄
2
597 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 44 1118 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
1461 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
G
H
I
J
M
P 957N/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 21
1
⁄
2
546 15
1
⁄
2
394 9
1
⁄
2
241 21
13
⁄
16
555 11
13
⁄
16
300 67 30
3 80 34 864 22
1
⁄
4
565 16
5
⁄
16
414 10
1
⁄
16
256 23
1
⁄
8
587 12
1
⁄
8
308 70 32
4 100 35
5
⁄
8
905 23
1
⁄
2
597 17
3
⁄
16
437 10
15
⁄
16
279 24
15
⁄
16
634 12
5
⁄
8
321
87 39
6 150 46
1
⁄
2
1181 33
3
⁄
4
857 20
1
⁄
2
521 13
1
⁄
2
343 28
1
⁄
4
718 15 382
160 73
Noryl
®
is a registered trademark of SABIC Innovative Plastics Holding BV.
1013
B64.4
(BFG & OSY only)
G
H
J
I
P
M
A
D
C (open)