Specification Sheet

Capacity
Series 957RPDA, 957NRPDA, 957ZRPDA flow curves as tested
by Underwriters Laboratory.
Flow characteristics collected using butterfly shutoff valves
Horizontal N-Pattern Z-Pattern
psi
18
16
14
12
10
8
6
0 50 100 150 200 250 300 350 gpm
0 190 380 570 760 950 1140 1330 lpm
7.5 15 fps
psi
16
14
12
10
8
6
0 100 200 300 400 500 gpm
0 380 760 1140 1520 1900 lpm
7.5 15 fps
2
1
⁄2"
3"
0 300 600 900 1200 1500 gpm
0 1140 2280 3420 4560 5700 lpm
7.5 12 fps
6"
0 500 1000 1500 2000 2500 gpm
0 1900 3800 5700 7600 9500 lpm
7.5 10 fps
8"
psi
26
22
18
14
10
6
0 100 200 300 400 500 600 700 800 gpm
0 380 760 1140 1520 1900 2280 2660 3040 lpm
7.5 13 fps
4"
0 500 1000 1500 2000 2500 3000 3500 gpm
0 1900 3800 5700 7600 9500 11400 13300 lpm
7.5 10 fps
10"
psi
18
16
14
12
10
8
6
Z
N
H
Z
N
H
N
Z
H
N
Z
H
N
Z
H
N
Z
H
psi
18
16
14
12
10
8
6
psi
16
14
12
10
8
6
4
Flow capacity chart identifies valve performance
based upon rated water velocity up to 25fps
• Service Flow is typically determined by a rated
velocity of 7.5fps based upon schedule 40 pipe.
• Rated Flow identifies maximum continuous duty
performance determined by AWWA.
• UL Flow Rate is 150% of Rated Flow and is not
recommended for continuous duty.
• AWWA Manual M22 [Appendix C] recommends
that the maximum water velocity in services be
not more than 10fps.
*UL Rated FlowRated FlowService Flow
PSI DROP
(*FRICTION LOSS)
*UL Rated FlowRated FlowService Flow
PSI DROP
(*FRICTION LOSS)
*UL Rated FlowRated FlowService Flow
PSI DROP
(*FRICTION LOSS)
*UL Rated FlowRated FlowService Flow
PSI DROP
(*FRICTION LOSS)
*UL Rated FlowRated FlowService Flow
PSI DROP
(*FRICTION LOSS)
*UL Rated FlowRated FlowService Flow
PSI DROP
(*FRICTION LOSS)
NOTICE
Inquire with governing authorities for local installation
requirements