Val-Matic Swing-Flex Check Valve - Manual (Page 2)

VAL-MATIC'S SWING-FLEX

CHECK VALVE
OPERATION, MAINTENANCE AND INSTALLATION
INTRODUCTION
The Swing-Flex  Check Valve has been designed
to give years of trouble-free operation. This
manual will provide you with the information
needed to properly install and maintain the valve
and to ensure a long service life. The valve is
opened by the fluid flow in one direction and
closes automatically to prevent flow in the reverse
direction.
An optional backflow actuator may be mounted on
the bottom of the valve to allow manual backflow
through the valve in the reverse direction.
Optional Mechanical Indicators and Limit Switches
may be mounted on the valve cover to provide
local and remote position indication.
An oil dashpot may be mounted on the bottom of
6” and larger valves to provide slow closure over
the last 10% of travel.
The valve is of the swing check type utilizing an
angled seat and fully encapsulated, resilient disc.
It is capable of handling a wide range of fluids
including flows containing suspended solids. The
Size, Flow Direction, Maximum Working Pressure,
and Series No. are stamped on the nameplate for
reference.
The "Maximum Working Pressure" is the non-
shock pressure rating of the valve at 150
o F. The
valve is not intended as an isolation valve for line
testing above the valve rating.
RECEIVING AND STORAGE
Inspect valves upon receipt for damage in
shipment. Unload all valves carefully to the ground
without dropping. Do not allow lifting slings or
chains to come in contact with the seat 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
Lubriko #CW-606. Do not expose disc to sunlight
or ozone for any extended period.
FIGURE 1. SWING FLEX  CHECK VALVE
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% un-restricted flow area
through the valve. Under reverse flow conditions,
the disc automatically returns to the closed
position to prevent reverse flow.
Several optional features are a backflow actuator,
mechanical indicator, limit switch and bottom oil
dashpot. All of these options ship loose of the
valve and require field installation.
WARNING
Do not use threaded holes in cover for
lifting the valve. Serious injury may result.
CAUTION
Do not use valve for line testing at
pressures higher than nameplate rating or
damage to valve may occur