Gorman-Rupp Pumps VGH1 1/2C31-B All serial numbers - Manual (Page 13)

VGH SERIES OM--05146
OPERATION PAGE C -- 2
DRAIN
COCK
HANDLE
Figure C-1. Hand Primer Assembly
Exhaust Primers
Engine driven pumps normally take advantage of
the engine exhaust gases by using them to operate
an exhaust primer. The exhaust is directed through
a venturi which creates a vacuum in the pump cas-
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 C-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
Starting procedures will vary slightly depending on
the pump application, type of priming device, and
type of drive. Consult the operations manual fur-
nished with the power source.
Rotation
The correct direction of pump rotation is indicated
by an arrow on the pump body or accompanying
decals. If the pump is operated in the wrong direc-
tion, the impeller could become loosened from the
shaft and seriously damage the pump.
The pump must operate in the direction in-
dicated by the arrow on the pump, or ac-
companying decals. Reverse rotation
could loosen the impeller and seriously
damage the pump.
If the pump is driven by an electric motor, consult
the operating manual furnished with the motor be-
fore attempting to start the motor.
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
Pump speed and operating points must be
within the continuous performance range