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Anti-Siphon Device
NX25-DDC pumps come from the factory ready to install an anti-siphon tube
back to the tank. An anti-siphon device (a.k.a. vacuum breaker) is important
because it will break a liquid siphon if there is an open nozzle or a leaking
hose below the fluid level in the tank when the pump is turned off. Fill-Rite
recommends anti-siphon kit # KIT321ASN be installed from the pump outlet back
to the vapor space in the tank.
This illustration shows where to install the tube so that it terminates in the vapor
space at the top of the tank. The tube must terminate in the vapor space; if it
terminates below the fluid level in the tank, it will not prevent siphoning. It is
very important there are no liquid traps in the tubing; it must have a continuous
slope from the pump down to the tank, and can be connected into any opening
in the top of the tank if the tank adapter is not used. Use reducer bushings as
required for proper fit and seal.
The 1/4 NPT opening in the side of the tank adapter terminates in the vapor space
of the tank. Make liquid-tight connections using the appropriate sealant from
the adapter to the anti-siphon outlet using a minimum of 1/4 metal tubing that is
compatible with whatever liquid is being pumped. If the anti-siphon tank adapter
is being used and the 1/4 NPT opening is not used for the tubing, leave the factory
installed plug in place.
Fill-Rite offers Anti-Siphon kit # KIT321ASN (available through your Fill-Rite
distributor). This kit contains the necessary fittings and tubing to complete
the installation as pictured in this section. NOTE: This kit ONLY works for tank
top installations.
Tank Installation
The NX25-DDC pump mounts to the bung of a tank by way of the tank adapter that is bolted to the inlet flange. The suction tube threads into the bottom of the tank
adapter, and must be cut to a length that positions it at least 3" from the bottom of the tank. The tank must be equipped with a vent cap.
Materials:
•
1-1/4" steel pipe cut to a length at least 3" above of the bottom of the tank when screwed into
the tank adapter, with the tank adapter screwed into the bung conection on top of the tank.
•
Thread pipe joint sealant appropriate for the application.
Figure 1
Figure 2
1. Thread the 1-1/4" pipe into the tank adapter. Seal threads liquid tight with appropriate sealant (Figure 1).
2. Screw the tank adapter (with suction pipe) into the tank bung; seal threads liquid tight with appropriate thread sealant (Figure 2).
3. Mount the pump on the adapter; making sure the seal and screen are installed as shown (Figure 3).
NOTICE
Be certain the screen is properly seated in the indentation in the tank adapter before installing seal and tank adapter to the pump. Failure to
properly seat the screen can result in fluid leakage.
fillrite.com
NX25-DDC SERIES DC FUEL TRANSFER PUMPS
Figure 3
INSTALLATION AND OPERATION MANUAL
ANTI-SIPHON INSTALLATION
TYPICAL TANK INSTALLATION
3" Min.
Anti-Siphon Line
6
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