Flomatic Corp, 15 Pruyn’s Island, Glens Falls, New York 12801
Phone: 518-761-9797 Fax: 518-761-9798 www.flomatic.com
745PI-BF-LS-ASC Rev. B
October 12, 2018
FLOMATIC'S
®
FLO-FLEX
®
Swing Check Valve
Operation, Maintenance and Installation Manual
INTRODUCTION
The Flomatic
®
Flo-Flex
®
Model 745 Swing Check Valve has been designed to give years
of trouble-free operation during normal operation. This O&M owners’ manual will
provide you with the information you need to properly install and maintain the valve and
to ensure a long service life. The Flo-Flex
®
check valve is opened automatically by the
fluid flow in one direction and closes automatically to prevent back-flow in the reverse
direction (see flow arrow cast into the valve body for flow direction). The Flo-Flex®
Model 745 swing check is design to meet the flange to flange laying length
according to AWWA C508. The valve angled valve seat and fully encapsulated,
resilient disc, is capable of handling a wide range of fluids including flows
containing suspended solids.
Flomatic
®
can provide an optional manual back-flush device that can be installed
on the bottom of the valve to allow manual backflow through the valve in the
reverse direction (Option Model 745 “BF”). Optional Position Indicators (Option Model 745 “PI”) PI and Limit Switches
(Option Model 745 “LS”) may also be mounted on the valve access cover to provide position indication.
The Valve Size, Flow Direction, Maximum Working Pressure are cast on to the side of the valve body surface for
reference. The "Maximum Working Pressure" is the non-shock pressure rating of the valve at “Max Temperature”
of 140°F (60°C). The valve shall not be subjected to any higher pressure or temperature above the valve
maximum standard rating.
RECEIVING AND STORAGE
Inspect valves upon receipt for damage in shipment. Unload valve carefully to the ground without dropping. Do not allow
lifting slings or chains to come in contact with the seat or flange sealing surface area; use eyebolts or rods through the
flange holes on large valves. Valves should remain crated, clean and dry until installed to prevent weather related damage.
For long term storage greater than six months, the rubber surfaces of the disc should be coated with a thin film of FDA
approved grease such as “Super Lube”. Do not expose disc to sunlight or ozone for any extended period as elastomer will
get damaged and degraded.
DESCRIPTION OF VALVE OPERATION
The valve is designed to prevent reverse flow automatically. During system flow
conditions, the movement of the fluid forces the disc to the open position allowing
100% flow area through the valve. The valves rubber coated steel disc
automatically returns to the closed position to prevent reverse flow. Several
optional features are a Backflush device, (Model 745 BF), Position Indicator
(Model 745PI), Limit Switch (Model 745LS). These valve product options are
described in more details below.
VALVE CONSTRUCTION
The Flomatic
®
Flo-Flex
®
Swing Check Valve is constructed
of rugged Ductile Iron with a rubber encapsulated valve disc. The rubber coated valve
disc is the only moving part assuring long life with minimal maintenance. The general
details of construction are
illustrated in Fig. 2. The body (1)
is
flanged for connection to the
pipeline with an access cover (2).
The
disc (3) is retained by the cover.
Item #
Qty.
Description
Material
ASTM
1 1
Body Ductile
Iron
A536
2 1
Cover Ductile
Iron
A536
3
1
Disc*
Buna coated Steel
--------
4 1
Gasket Buna
--------
5
A/R
Cover Bolt
Steel
SAE Grade 5
6 1
Plug
Malleable Iron
--------
*Optional EPRM or Viton Coated Steel
Standard
Max
Working
Pressure:
2”
thru
24”
250
psi
Standard
Max
Temperature:
140°F
(60°C)
FIG 1.
Flo-Flex®
Swing Check Valve
Fig 2.
Flo-Flex
®
Cross Section
