Gorman-Rupp Pumps 02F1-GR 642659 and up - Manual (Page 13)

OM-01155 0 SERIES
PAGE B - 6 INSTALLATION
suction line to ensure an adequate supply of liquid
to the pump.
Damage To the pump resulting from debris
in the suction line will not be covered by
the pump warranty.
Before connecting the suction and dis­
charge piping, carefully check the storage
tank and piping for construction debris
such as nuts, bolts, wire, weld slag, and
other foreign material. Install a commer­
cially available 80 mesh screen in the suc­
tion line to prevent debris from entering the
pump.
If a throttling valve is desired in the discharge line,
use a valve as large as the largest pipe to minimize
friction losses. Never install a throttling valve in a
suction line.
With high discharge heads, it is recommended that
a throttling valve and a system check valve be in­
stalled in the discharge line to protect the pump
from excessive shock pressure and reverse rota­
tion when it is stopped.
Sealing
Since even a slight leak will affect priming, head,
and capacity, especially when operating with a
high suction lift, all connections in the suction line
should be sealed with pipe dope to ensure an air­
tight seal. Follow the sealant manufacturer's rec­
ommendations when selecting and applying the
pie dope.
Valves
Gorman‐Rupp manufactures several sizes of flow‐
diverting (FDF) valves for use in truck‐mounted
pumping applications. The valves are designed to
reverse the flow of liquid with only the turn of a han­
dle. This allows the same pump to fill or dispense
from the tank.
The FDF valve is designed for directing
flow only. it will not serve as a positive shut­
off or throttling valve.
See Figure 5 illustrating the theory of operation for
a typical FDF valve. Consult the factory for further
assistance or other sizes.
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.