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Gorman-Rupp Pumps 06D17-GAR 708768 thru 1000782 User Manual

Page 14

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OM−01274

0 SERIES

PAGE B − 7

INSTALLATION

FILL

POSITION

DISPENSE

FILL

TOP VIEW

DISPENSING

POSITION

Figure 5. FDF Valve Theory of Operation

When the center web of the valve is aligned with the
larger ports (filling position), the flow passes
straight through. When the handle is turned to the
dispensing position, the web blocks the straight
flow and opens two paths of flow through the larger
ports to the smaller ports.

Siphoning

Do not terminate the discharge line at a level lower
than that of the liquid being pumped unless a si-
phon breaker is used in the line. Otherwise, a si-

phoning action causing damage to the pump
could result.

Eductors

An eductor may be used in conjunction with an
FDF valve to increase dispensing rates and im-
prove efficiency. An eductor may also be used to
collapse the tank service hose after the tank has
been filled or emptied.

Contact the Gorman-Rupp Company or an author-
ized distributor for specifications and performance
data on eductors or FDF valves.