Installation Guide

ManualsBrandsUnbranded ManualsBackflow Valves1 in. Lead-Free Bronze Double Check Valve Assembly with Integral Male 45 Degree Flare SAE Test Fitting

ZURN WILKINS

1747 Commerce Way, Paso Robles, CA 93446 Phone:855-663-9876 Fax:805-238-5766

MODEL 350XL 3/4" & 1" (STANDARD & METRIC)

0 20 40 60 80

FLOW RATES (GPM)

PRESSURE LOSS (PSIG)

103

0.00 1.26 2.52 3.79 5.05

FLOW RATES (l/s)

PRESSURE LOSS (kpa)

IS350XL 34-1 (REV. 4/13)

Performance Characteristics

Troubleshooting

PROBLEM

1. LEAKING CHECK VALVES

2. LOW OR NO FLOW

POSSIBLE CAUSES

1. Debris on seat or seal ring

2. Damaged seat

3. Damaged seal ring

4. Damaged check o-ring

1. Device installed backwards

2. Shut-off valves or valve upstream

may not be fully open

3. Low supply pressure

CORRECTIVE ACTION

1. Clean seat and seal ring area

2. Replace seat

3. Replace poppet

4. Replace check o-ring

FLOW CHARACTERISTICS

3/4" (20mm)

1" (25mm)

SPECIFICATIONS

Maximum working water pressure 175 PSI

Maximum working water temperature 180°F

Hydrostatic test pressure 350 PSI

End connections Threaded ANSI B1.20.1

Capacity thru Schedule 40 Pipe

Pipe size 5 ft/sec 7.5 ft/sec 10 ft/sec 15 ft/sec

1/8" 1 1 2 3

1/4" 2 2 3 5

3/8" 3 4 6 9

1/2" 5 7 9 14

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

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.

Proposition 65 Warning This product contains chemicals known to the State of California to cause cancer or birth defects

or other reproductive harm.