Install Instructions

MODEL 475 & 475V 4" & 6" (STANDARD & METRIC)
0
5
10
15
20
0 400 800 1200 1600
FLOW RATES (GPM)
PRESSURE LOSS (PSIG)
0
34
69
103
138
0.0 25.2 50.5 75.7 100.9
FLOW RATES (l/s)
PRESSURE LOSS (kpa)
MODEL 475 & 475V 2 1/2" & 3" (STANDARD & METRIC)
0
5
10
15
20
0 200 400 600 800
FLOW RATES (GPM)
PRESSURE LOSS (PSIG)
0
34
69
103
138
0.0 12.6 25.2 37.9 50.5
FLOW RATES (l/s)
PRESSURE LOSS (kpa)
WILKINS, a ZURN company
1747 Commerce Way, Paso Robles, CA 93446 Phone:[phone] Fax:[phone]
IS475(REV. 11/10)
4
a company
®
®
Performance Characteristics
Troubleshooting
Proper performance is dependent upon licensed, qualied personnel performing regular, periodic testing according to WILKINS' specications and
prevailing governmental & industry standards and codes and upon following these installation instructions. Failure to do so releases WILKINS of
any liability that it might otherwise have with respect to that device. Such failure could also result in an improperly functioning device.
SPECIFICATIONS
Maximum working water pressure: 175 PSI
Maximum working water temperature: 140°F
Hydrostatic test pressure: 350 PSI
End connections: Flanged ANSI B16.1
Class 125
PROBLEM POSSIBLE CAUSES CORRECTIVE ACTION
1. SUDDEN OR RAPID 1. Drop in inlet pressure. 1. Install an in-line spring loaded check valve or pressure reducing
SPITTING 2. Sudden increase in downstream valve upstream of Backow Preventer.
pressure due to waterhammer 2. Install an in-line spring loaded check valve or pressure reducing
from quick closing shut-off valve valve downstream of Backow Preventer.
installed downstream.
2. LIGHT INTERMITTENT 1. Slightly fouled #1 check. 1. Clean #1 check and/or turn check valve seal ring over or replace.
DRIP 2. Slightly fouled relief valve seat. 2. Clean relief valve seat and/or turn relief valve seal ring over or
replace.
3. CONTINUOUS 1. Fouled #1 check and/or #2 check. 1. Clean check valves and/or turn check valve seal ring over or
DISCHARGE 2. Fouled relief valve seat. replace.
2. Clean relief valve seat and/or turn relief valve seal ring over or
replace.
Capacity thru Schedule 40 Pipe
Pipe size 5 ft/sec 7.5 ft/sec 10 ft/sec 15 ft/sec
2 1/2" 75 112 149 224
3" 115 173 230 346
4" 198 298 397 595
6" 450 675 900 1351
8" 780 1169 1559 2339
10" 1229 1843 2458 3687

Rated Flow (Established by approval agencies)
3" (80mm)
4" (100mm)
6" (150mm)
2 1/2" (65mm)