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Thermoplastic Valves Product Guide & Engineering Specifictions
Check Valves
Page 803 Suitable for Oil-Free air handling to 25 psi, not for distribution of compressed air or gas Spears
®
Manufacturing Company
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Sample Engineering Specification
All thermoplastic check valves Shall be True Union Utility
Swing Check or True Union Utility Spring Check type con-
structed from PVC Type I, ASTM D 1784 Cell Classification
12454. All union nuts shall have Buttress threads coupled to
a replaceable sealed unit with EPDM seat and weighted disc.
All Spring Check Valves shall have stainless steel spring
assisted operation. All valves shall have external flow arrow
direction designation. All valves shall be certified by NSF
International for use in potable water service. All valves shall
be pressure rated to 150 psi for water @73°F in full flow
(open) position and to 75 psi @ 73°F back pressure (closed),
as manufactured by Spears
®
Manufacturing Company.
Valve
Size
Seat
Material
PVC Material
1
Pressure
Rating
Socket Threaded SR Threaded
1/2 EPDM S1720-05 S1720-05F S1720-05FSR
150 psi
@ 73°F
Full Flow
(Open)
75 psi
Back
Pressure
(Closed)
3/4 EPDM S1720-07 S1720-07F S1720-07FSR
1 EPDM S1720-10 S1720-10F S1720-10FSR
1-1/4 EPDM S1720-12 S1720-12F S1720-12FSR
1-1/2 EPDM S1720-15 S1720-15F S1720-15FSR
2 EPDM S1720-20 S1720-20F S1720-20FSR
2-1/2 EPDM S1720-25 S1720-25F S1720-25FSR
3 EPDM S1720-30 S1720-30F S1720-30FSR
4 EPDM S1720-40 S1720-40F S1720-40FSR
Valve
Size
Seat
Material
PVC Material
1
Pressure
Rating
Socket Threaded SR Threaded
1/2 EPDM S1780-05 S1780-05F S1780-05FSR
150 psi
@ 73°F
Full Flow
(Open)
75 psi
Back
Pressure
(Closed)
3/4 EPDM S1780-07 S1780-07F S1780-07FSR
1 EPDM S1780-10 S1780-10F S1780-10FSR
1-1/4 EPDM S1780-12 S1780-12F S1780-12FSR
1-1/2 EPDM S1780-15 S1780-15F S1780-15FSR
2 EPDM S1780-20 S1780-20F S1780-20FSR
2-1/2 EPDM S1780-25 S1780-25F S1780-25FSR
3 EPDM S1780-30 S1780-30F S1780-30FSR
4 EPDM S1780-40 S1780-40F S1780-40FSR
Features - PVC White & PVC Clear
Spears
®
True Union Utility Swing Check and spring assisted
True Union Utility Spring Check Valves offer a compact,
high performance check valve for Landscape & Irrigation,
Pool & Spa, Aquaculture, OEM 1 and many general pur-
pose applications. True Union design allows for easy in-line
replacement of maintenance free sealed units. These valves
feature long-life EPDM elastomer seats with weighted disc
for full-flow with minimal restriction and positive shutoff.
Spring assisted “Spring Check” model incorporates a posi-
tive-pressure spring to assist in valve closing without slam-
ming. Produced from PVC White or PVC Clear material
with Socket, Threaded or SR Threaded end connectors in IPS
Sizes 1/2" through 4".
•
Chemical & Corrosion Resistant PVC White or High
Visibility PVC Clear Construction
•
No Metal Parts on Swing Check - Stainless Steel Spring
on Spring Check
• True Union style for Easy In-line Replacement of
Sealed Unit
• Strong Buttress Threaded Union Nuts
• Engineered for Maximum Flow, Quick Response &
Positive Shutoff
•
Long-Life, High Grade EPDM Seat with Weighted Disc
• Spring Assisted Spring Check Model Option for
Positive Closing
•
Pressure Rated to 150 psi @ 73°F Full-Flow (open)
and 75 psi @ 73°F Back Pressure (closed)
•
Suitable for either Horizontal or Vertical Up-flow
Installations and Vacuum Service
• NSF
®
Certified for Potable Water Use
• Silicone-Free Assembly
Quick-View True Union Utility
Swing Check Valve Selection Chart
Quick-View True Union Utility Spring
Check Valve Selection Chart
1: For PVC Clear Swing Check, replace dash (-) separator with the letter "C" in the part
number (e.g. S1720C05), (e.g. S1720C05F) or (e.g. S1720C05FSR)
1: For PVC Clear Spring Check, replace dash (-) separator with the letter "C" in the part
number (e.g. S1780C05), (e.g. S1780C05F) or (e.g. S1780C05FSR)