Operation
The Air-Operated Double Diaphragm Pump requires
a minimum of 20 psig of air to operate, with some variation
according to diaphragm material. Increasing the air pressure
results in a more rapid cycling of the pump and thus a higher
liquid flow rate. In order to not exceed 120 psig of inlet air
pressure, and for accurate control of the pump, it is suggested
to use a pressure regulator on the air inlet.
An alternate means of controlling the flow-rate of the pump is
to use an inlet air valve and partially open or close accordingly.
When the air valve is completely in the closed position, the
pump will cease to operate.
A third method of controlling the flow rate of the
pump is to use a liquid discharge valve. Closing the liquid dis
-
charge valve will cause a decrease in the flow rate since the
pump will operate against a higher discharge pressure.
Solenoid control of the inlet air may also be used in order to
facilitate remote operation. A three way
solenoid valve is recommended, in order to allow the air to
“bleed off” between the solenoid and the pump.
Do not use valves for flow control on the suction side
of the pump. (Closing or partially closing a liquid
suction valve restrict the suction line and may cause damage
to the diaphragms.) Suction strainers may be employed to
reduce or eliminate larger solids, but routine maintenance is
necessary in order to prevent
a restriction on the suction.
Maintenance
Due to the unique nature of each application, periodic inspec-
tion of the pump is the best method to determine a proper
maintenance schedule. A record should be kept of all repairs
made to an installed pump. This will serve as the best predic-
tor of future maintenance.
Typical maintenance involves replacing of “wear-parts” such
as the diaphragms, balls, valve seats and O-rings. Proper
maintenance can ensure trouble-free operation of the pump.
Refer to repair and assembly
instructions for further details.
WARNING
Maintenance must not be performed
when a hazardous atmosphere is present.
Maintenance Schedule
Weekly (or daily)
Make a visual check of the pump. If pumped fluid is leaking
out of the pump, pipe fittings or muffler turn off pump and
schedule maintenance.
Every three months
Inspect fasteners and tighten any loose fasteners to recom-
mended torque settings.
Schedule pump service based on pump’s service
history.
P h o n e : ( 5 8 5 ) 4 2 6 - 0 9 9 0
www.lutzjescoamerica.com
Fax: (585) 426-4025
12
Operation & Maint
enance Ins
tructions
AODD: 2” Air Operat
ed Double Diaphragm Pum
p
