Installation Guide


Rated Flow (established by approval agencies)
0.0 3.2 6.3 9.5 12.6 15.8
0
34
69
103
138
172
0
5
10
15
20
25
0 50 100 150 200 250
FLOW RATES (l/s)
PRESSURE LOSS (kPa)
PRESSURE LOSS (PSIG)
FLOW RATES (GPM)
MODEL 950XL3 1 1/4", 1 1/2" & 2" (STANDARD & METRIC)
0.0 0.6 1.3 1.9 2.5 3.2 3.8 4.4 5.0
0
34
69
103
138
172
0
5
10
15
20
25
0 10 20 30 40 50 60 70 80
FLOW RATES (l/s)
PRESSURE LOSS (kPa)
PRESSURE LOSS (PSIG)
FLOW RATES (GPM)
MODEL 950XL3 3/4" & 1" (STANDARD & METRIC)
3/4" (20mm)
1" (25mm)
1 1/4" (32mm)
1 1/2" (40mm)
2" (50mm)
ZURN WILKINS
1747 Commerce Way, Paso Robles, CA 93446 Phone: [phone] Fax: [phone]
IS950XL3 (REV. A 7/21)
4
PROBLEM
1. LEAKING CHECK VALVES
2. LOW OR NO FLOW
POSSIBLE CAUSES
1. Debris on seat or seal ring
2. Damaged seat
3. Damaged seat o-ring
1. Device installed backwards
2. Shut-o󰀨 valves or valve upstream may
not be fully open
3. Low supply pressure
Troubleshooting
Performance Characteristics
Proper performance is dependent upon licensed, qualied personnel performing regular, periodic testing according to ZURN
WILKINS’ specications and prevailing governmental & industry standards and codes and upon following these installation in-
structions. Failure to do so releases ZURN WILKINS of any liability that it might otherwise have with respect to that device. Such
failure could also result in an improperly functioning device.
Capacity thru Schedule 40 Pipe (GPM)
Pipe size 5 ft/sec 7.5 ft/sec 10 ft/sec 15 ft/sec
3/4" 8 12 17 25
1" 13 20 27 40
1 1/4" 23 35 47 70
1 1/2" 32 48 63 95
2" 52 78 105 167
SPECIFICATIONS
Minimum working water pressure 20 PSI
Maximum working water pressure 175 PSI
Minimum working water temperature 33°F
Maximum working water temperature 180°F
Hydrostatic test pressure 350 PSI
Threaded end connections ANSI B1.20.1
www.zurn.com
CORRECTIVE ACTION
1. Clean seat and seal ring area
2. Replaced seat
3. Replaced seat o-ring
1. Verify ow directions arrow
2. Turn handles counterclockwise
3. Attach pressure gauge to test cock #1 and
verify pressure