Page 124 - Webster Service Manual

119
OIL SAFETY
U
/
L ®
LISTED
VALVES
OIL SAFETY VALVES
INSTALLATION INSTRUCTIONS
Webster OSV
®
valves can be used for the following
applications which require slightly different installations:
1.
Preventing tank siphoning and oil leaks in the event
of line breaks. (See Section “A”)
2.
For use with a supply pump (booster pump) to pre-
vent excessive pressure at the inlet of the burner fuel
unit. (See Section “B”)
Many state and local
codes require a device
that will automatically
shut off the oil supply
before it enters a build-
ing should the line
between the device
and the burner be bro-
ken. NFPA standards
require that the pres-
sure at the burner fuel
pumps must not exceed 3 PSI. The Webster OSV
®
sat-
isfies both requirements when properly installed. Check
local codes for any special requirements.
SECTION “A”
Using the OSV
®
valve to help prevent oil spills from bro-
ken or corroded lines and fittings.
Operation
A recent Environmental Protection Agency sponsored
study found that most oil leaks are found in the piping
rather than the tank. Webster OSV
®
valves help prevent
oil spills by stopping oil flow in the event of line breaks
caused by corroded lines or leaky fittings. The OSV
®
9
is mounted in the supply line as close as possible to the
tank. Operation is simple. The OSV
®
requires a vacuum
on its outlet side to open the valve and allow oil flow .
When the burner is shut down, there is no vacuum from
the fuel unit and the OSV
®
valve is closed—oil flow is
stopped. When the burner starts up, vacuum from the
fuel unit opens the OSV
®
,
allowing oil to flow.
If a corroded broken line or a loose fitting causes a leak
to develop between the OSV
®
and burner, air enters the
line. Fuel unit vacuum is reduced and the OSV
®
will not
open, preventing tank siphoning and a major spill.
BIO OIL SAFETY VALVE UPGRADE
OSV38 and OSV50
Webster currently has an Oil Safety V alve for Bio and
Waste Oil applications. This valve is U/L listed for Bio
Fuel and is compatible with a wide range of other fuels
such as B20-B100, #1-#2 Fuel Oil, Diesel, Kerosene and
Waste Oil, with a Temperature Range of -40 to 140ºF.