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Thermoplastic Valves Product Guide & Engineering Specifictions
Backwater Valves
Page 819 Suitable for Oil-Free air handling to 25 psi, not for distribution of compressed air or gas Spears
®
Manufacturing Company
Due to Material Cost Variations, Prices Sub
j
ect to Chan
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e. Check On-line Catalo
g@
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• All PVC Construction with EPDM Flapper Seal
• Threaded Top Plug for Convenient Service
• Simple Snap-In Internal Flapper Assembly for Easy
Replacement
• Optional Factory Assembled Service-Access Extension
Kits - External Housing with Internal Extension for
Convenient Removal, Inspection or Replacement
• Optional Extension Components Kits for Assembly with
User-Supplied Pipe
• Available in Sizes 2", 3", 4" and 6" with Socket Ends
• Direct Connection to ASTM D 2665 PVC DWV or other
IPS size pipe. Spears
®
IPS x Sewer Adapters Available for
Connection to ASTM 3034 Sewer
• Conforms to ASME/ANSI A112.14.1 for Backwater Valves
• Pressure Rated to 43 psi (100 feet of head) @ 73°F
Sample Engineering Specification
All thermoplastic valves shall be Backwater type constructed
from PVC Type I, ASTM D 1784 Cell Classification 12454.
All Valve Seats shall be EPDM. All valves shall have external
Arrow Flow Indicator. All valves shall be pressure rated to
43 psi (100 feet of Head) for water @ 73°F as manufactured
b
y Spears
®
Manufacturing Company.
Quick View
Extension Components Kit Options
Extension Adapters and Flap Assembly with or without valve. Must
be assembled with user-supplied Class 125 or Schedule 40 Pipe.
Valve
Size
Socket Valve
With Extension
Component Kit
Extension
Component
Kit Only
Pressure
Rating
2 S275P-AK S275P-ECK
43 psi
(100 feet of
head)
3 S375P-AK S375P-ECK
4 S475P-AK S475P-ECK
6 S675P-AK S675P-ECK
Basic Valve
Features - PVC Gray
Backwater Valves are designed to prevent backflow in numerous
applications where easy service access for maintenance and cleaning
is needed. Excellent for use in sanitary or storm sewer drainage
systems to prevent waste back up due to inadequate drainage, fo
r
balancing multi-level ponds, aquaculture features or storage tan
k
systems, and many other applications. Spears
®
Backwater Valve has
been engineered for improved function and easier service, especially
in buried service with use of optional Service-Access Extension Kit
.
Valve with
Extension Kit
Valve
Size
Seat
Material
PVC Material
Pressure Rating
Socket
2 EPDM S275P
43 psi
(100 feet of Head)
3 EPDM S375P
4 EPDM S475P
6 EPDM S675P
Quick-View Backwater Valve Selection
Chart Standard Valve
PVC Service-Access
Extension Kit Options:
Available as a complete unit, with or without valve, factory
assembled to internal flap assembly, extension pipe, an
d
external extension housing with top access adapter in
convenient increments of 12", 16", 20", 24", 36", an
d
48" (measured from top of valve to top of extension). All
extension kits can be cut shorter in the field for custom
fits. Also available as Extension Components Kits, with
or without valve for assembly with user-supplied Class
125 or Schedule 40 pipe. Kits without valve require use
of existing valve top Access Plug, all kits require solven
t
cement assembly to valve. Contact Spears
®
for pricing on
custom cut lengths.