FILL-RITE 300V series Gebrauchsaneisung Und Sicherheitsvorschriften Seite 15

The pumps are shipped with a threaded vacuum breaker installed.
Fill-Rite recommends that the vacuum breaker be tubed back to
the tank. The vacuum breaker is used to break a siphon should an
open nozzle or a leaking hose be below the fluid level in the tank
with the pump turned off.
The following illustration shows methods of installing tubing for the
vacuum breaker that terminates in the vapor space at the top of the
tank. The tubing must terminate in the vapor space; if the tubing
terminates below the liquid level of the tank, the vacuum breaker
will not prevent siphoning. It is also very important that there are
no liquid traps in the tubing. The tubing must have a continuous
slope from the pump down to the tank. If the pump is installed
below the top of the tank, the tubing may slope both ways from a
single high point above the tank. Alternately, tubing can be piped
to any available opening on top of tank it the tank adapter is not
used. Use reducer bushings as required.
ANTI-SIPHON LINE
(NOT INCLUDED)
VACUUM BREAKER
VACUUM BREAKER TUBING INSTALLATION
Fill-Rite recommends using the vacuum breaker tank adapter with a 1/4
npt opening in the side of the hex portion that terminates in the vapor
space of the tank. Install tank adapter per instructions found in this
manual. Make liquid tight connection from the adapter to the vacuum
breaker using a minimum of 1/4 metal tubing compatible with the liquid
being pumped. If a vacuum breaker tank adapter is used and the 1/4 npt
opening is not used for the tubing, plug the opening liquid tight.
PUMP
ADAPTER
SKID TANK
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