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NTRODUCTION
The Vacuum Breaker has been designed with
stainless steel trim to give years of trouble-free
operation. This manual will provide you with the
information to properly install and maintain the
valve to ensure a long service life. The Vacuum
Breaker is designed to open fully and allow air to
enter the piping system during critical vacuum
conditions caused by power failure or rapid
draining of the system.
NOTE: The vacuum breaker will not allow air to
escape from the pipeline. An optional air release
valve piped near the vacuum breaker would be
needed to release accumulated air during
system operation.
Also, this valve is not intended for fluids
containing suspended solids such as
wastewater.
The valve is a float-operated, resilient-seated
valve designed to handle clean fluids. The Size,
Maximum Working Pressure, and Series No. are
stamped on the nameplate for reference.
RECEIVING AND STORAGE
Inspect valves upon receipt for damage in
shipment. Unload all valves carefully to the
ground without dropping.
Valves should remain boxed, clean and dry until
installed to prevent weather related damage.
For long term storage greater than six months,
the rubber surfaces of the seat should be coated
with a thin film of FDA approved grease such as
Lubriko #CW-606. Do not expose seat to
sunlight or ozone for any extended period.
VAL-MATIC'S 1/2"-3" VACUUM BREAKER
OPERATION, MAINTENANCE AND INSTALLATION
FIGURE 1.
1/2"-3" VACUUM BREAKER
CAUTION:
This valve is not intended
for fuel service or fluids
containing suspended
solids.
DESCRIPTION OF OPERATION
The Vacuum Breaker is designed to prevent
vacuum conditions from occurring in pipes or
tanks. After a power failure or rapid draining of
the system, a vacuum condition often occurs in
a pipe or tank. The pressure difference between
the inside vacuum and outside air will cause a
downward force on the float. At vacuum
pressures greater than –0.25 psig, the float will
compress the spring and move downward
allowing free flow of outside air into the pipe or
tank to eliminate the vacuum.
When positive pressure is restored in the pipe or
tank, the vacuum breaker will automatically
close and seal tightly against the resilient seat.
Optional valves can be piped to the vacuum
breaker to vent trapped air in the pipeline if
needed.
The valve may be supplied with an optional
threaded hood for insertion into the top of the
valve. The only moving parts in the valve are the
float and the spring. The float guide controls the
movement of the float and assures that the float
contacts the seat evenly.
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