Product Overview

True Union Utility Spring Check Valves
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Standard Spring Loaded Swing Assembly Maintains a
Positive Seal
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Engineered for Maximum Flow, Quick Response &
Positive Shutoff
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Excellent for Pool & Spa, OEM and General Purpose
Applications
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Compact, Space-Saving Design
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Replaceable PVC White or Clear Sealed Cartridge Unit
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High Grade EPDM Seat
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Suitable for Horizontal or Vertical Up-flow Installations
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Socket, Threaded or SR Threaded End Connections
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Pressure Rated to 150 psi @ 73°F Full Flow (open),
75 psi Back Pressure (closed)
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Maximum Service Temperature 140°F
(temperature/pressure de-ratings apply)
General Installation Information:
Spring check valves
are designed for horizontal installations, but may be
installed in up
-flow only vertical position. Check valves
MUST be installed with the valve's FLOW arrow pointing in
the direction of the flow. Do not install valve upside down.
Flow velocity should not exceed 5 ft./sec. Minimum opening
pressure = 0.5 psi.
Pressure Rating @ 73°F (23°C), Water
Full Flow (open) 150 psi
Back Pressure (closed) 75 psi
Maximum Service Temperature
140°F (60°C)
Temperature/Pressure De-ratings Apply
PVC White
Size Socket Thread SR Thread
Std
Pk
Mstr
Pk
Disc
Code
1/2
S1780-05
41.49
S1780-05F
41.49
S1780-05FSR
44.12
20 0 026
3/4
S1780-07
47.06
S1780-07F
47.06
S1780-07FSR
50.84
30 0 026
1
S1780-10
49.05
S1780-10F
49.05
S1780-10FSR
54.26
18 0 026
1-1/4
S1780-12
51.09
S1780-12F
51.09
S1780-12FSR
59.44
12 0 026
1-1/2
S1780-15
54.43
S1780-15F
54.43
S1780-15FSR
68.82
10 0 026
2
S1780-20
56.67
S1780-20F
56.67
S1780-20FSR
72.23
10 0 026
2-1/2
S1780-25
101.14
S1780-25F
101.14
S1780-25FSR
125.24
20026
3
S1780-30
105.51
S1780-30F
105.51
S1780-30FSR
147.15
20026
4
S1780-40
149.71
S1780-40F
149.71
S1780-40FSR
192.89
10026
PVC Clear
Size Socket Thread SR Thread
Std
Pk
Mstr
Pk
Disc
Code
1/2
S1780C05
42.80
S1780C05F
42.80
S1780C05FSR
45.43
20 0 026
3/4
S1780C07
48.54
S1780C07F
48.54
S1780C07FSR
52.32
30 0 026
1
S1780C10
50.56
S1780C10F
50.56
S1780C10FSR
55.82
18 0 026
1-1/4
S1780C12
52.64
S1780C12F
52.64
S1780C12FSR
61.00
12 0 026
1-1/2
S1780C15
55.82
S1780C15F
55.82
S1780C15FSR
70.50
10 0 026
2
S1780C20
57.45
S1780C20F
57.45
S1780C20FSR
73.94
10 0 026
2-1/2
S1780C25
104.27
S1780C25F
104.27
S1780C25FSR
128.43
20026
3
S1780C30
108.76
S1780C30F
108.76
S1780C30FSR
150.39
20026
4
S1780C40
154.36
S1780C40F
154.36
S1780C40FSR
197.53
10026
NOT FOR USE WITH COMPRESSED AIR OR GAS
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