IS950LF (REV. 12/99)
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
Performance Characteristics
Proper performance is dependent upon licensed, qualified personnel performing regular, periodic testing according to WILKINS'
specifications 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.
Troubleshooting
PROBLEM
1.
LEAKING CHECK VALVES
2.
LOW OR NO FLOW
POSSIBLE CAUSES
1. Debris on seat or seal ring
2. Damaged seat area
3. Damaged seat o-ring
4. Damaged bolt o-ring(s) on check retainer
1. Device installed backwards
2. Gate valves not fully open
3. Low supply pressure
CORRECTIVE ACTION
2. Replace check assembly
3. Replace seat o-ring
4. Replace o-ring(s)
1. Verify flow direction arrow
2. Turn handles counterclockwise
3. Attach pressure gauge to testcock #1
and verify pressure
Model 950LF 3/4" & 1" (STANDARD)
0
20
60
80
0
5
10
15
FLOW RATES (U.S. GPM)
PRESSURE LOSS (U.S. PSIG)
Model 950LF 1¼", 1½" & 2" (STANDARD)
0
50
100
150
200
250
5
10
15
FLOW RATES (U.S. GPM)
PRESSURE LOSS (U.S. PSIG)
40
Rated Flow
(Established by approval agencies)
1"
1 1/4"
2"
1 1/2"
3/4"
0
4
5
Model 950LF 20mm & 25mm (METRIC)
Model 950LF 32mm, 40mm & 50mm (METRIC)
120
90
30
0
PRESSURE LOSS (kpa)
0
3
6
9
18
FLOW RATE (l/s)
0
1
2
3
FLOW RATE (l/s)
60
120
90
0
PRESSURE LOSS (kpa)
60
32mm
40mm
50mm
Rated Flow
(Established by approval agencies)
15
12
20mm
25mm
30
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
Capacity thru Schedule 40 Pipe
1. Clean seat area
WILKINS OPERATION OF ZURN PLUMBING PRODUCTS
1747 Commerce Way, Paso Robles, CA 93446 Phone:805/238-7100 Fax:805/238-5766
