Gorman-Rupp Pumps VG2D3-B 1191621 and up - Manual (Page 13)

VG SERIES OM--02811
OPERATION PAGE C -- 2
ing in order to fill the suction line and pump casing
with liquid. To prime a pump using an exhaust
primer, open the gas cock in the priming line and
engage the exhaust primer until liquid is thrown out
of the ejector nozzle.
GAS
COCK
HANDLE
Figure 2. Exhaust Primer Assembly
Air can be exhausted to prime a pump by using a
vacuum pump. Either a wet type or a dry type vac-
uum pump may be used; however, a wet type is
preferred since it will not be damaged if liquid en-
ters it. If a dry vacuum pump is used, provisions
must be made to keep liquid from entering it.
Auxiliary Ejectors
Ejectors function much like exhaust primers. They
may be operated by steam, compressed air, water
or exhaust gases. To prime a pump using an ejec-
tor, open the gas cock in the priming line and oper-
ate the ejector until liquid is thrown out the ejector
nozzle.
Vacuum Pumps
Air can be exhausted to prime a pump by using a
vacuum pump. Either a wet type or a dry type vac-
uum pump may be used; however, a wet type is
preferred since it will not be damaged if liquid en-
ters it. If a dry vacuum pump is used, provisions
must be made to keep liquid from entering it.
STARTING
Consult the operations manual furnished with the
power source.
Rotation
The correct direction of pump rotation is counter-
clockwise when facing the impeller. If the pump is
operated in the wrong direction, pump perform-
ance could be adversely affected, and the pump
could be seriously damaged.
Only operate this pump in the direction in-
dicated by the arrow on the pump body
and on the accompanying decal. Other-
wise, pump performance could be ad-
versely affected, and the pump could be
seriously damaged.
Consult the operating manual furnished with the
power source before attempting to start the power
source.
If an electric motor is used to drive the pump, re-
move V-belts, couplings, or otherwise disconnect
the pump from the motor before checking motor
rotation. Operate the motor independently while
observing the direction of the motor shaft, or cool-
ing fan.
If rotation is incorrect on a three-phase motor, have
a qualified electrician interchange any two of the
three-phase wires to change direction. If rotation is
incorrect on a single-phase motor, consult the lit-
erature supplied with the motor for specific instruc-
tions.
OPERATION
Leakage
No leakage should be visible at pump mating sur-
faces, or at pump connections or fittings. Keep all
line connections and fittings tight to maintain maxi-
mum pump efficiency.
Liquid Temperature And Overheating
The maximum liquid temperature for this pump is
160_ F (71_C). Do not apply it at a higher operating
temperature.
Overheating can occur if operated with the valves
in the suction or discharge lines closed. Operating
against closed valves could bring the liquid to a
boil, build pressure, and cause the pump to rup-
ture or explode. If overheating occurs, stop the