Lincoln 84852 Operating Instructions And Service Manual

LINCOLN
Models 84852, 84853, 84855, 84856
1"AIR-POWERED DIAPHRAGM PUMP
Series "B"
OPERATING AND
SERVICE INSTRUCTIONS
HAZARD WARNING
POSSIBLE EXPLOSION
HAZARD can result if 1,1,1,
-Trichloroethane, Methylene
Chloride or other Halogenated
Hydrocarbon solvents are used
in pressurized fluid systems
having Aluminum or Galvanized
wetted parts. Death, serious
bodily injury and/or property
damage could result. Consult
with the factory if you have
questions concerning Haloge-
nated Hydrocarbon solvents.
Do not use for pumping flam-
mable materials. Build up and
discharge of static electricity
may result in a fire and/or ex-
plosion causing personal injury
and loss to property.
Principle of Operation
The pump is powered by compressed
air which alternately pressurizes the
inner sides of the two diaphragm cham-
bers while simultaneously exhausting
OPERATING INSTRUCTIONS, SERVICE MANUAL
AND REPAIR PARTS LIST
the opposite inner chambers causing
the diaphragms, which are connected
by a shaft, to move endwise. Since air
pressure is applied over the entire sur-
face of the diaphragm which is forcing
liquid to be discharged by its other side,
the diaphragm is operating under a
balanced condition during the dis-
charge stroke. This allows the unit to be
operated at discharge heads over 200
feet (61 meters) of water head.
Alternate pressurizing and exhaust-
ing of the diaphragm chamber is per-
formed by an externally mounted, pilot-
operated, four way, spool type air distri-
bution valve. When the spool is at one
end of the valve body, inlet air pressure
is connected to one diaphragm cham-
ber and the other diaphragm chamber is
connected to the exhaust. When the
spool is moved to the opposite end of
the valve body, the porting of chambers
is reversed. The air distribution valve
spool is moved from one end position to
the other in the valve body by means of
an internal pilot valve which alternately
pressurizes the ends of the air distribu-
tion valve spool while simultaneously
exhausting the other ends. The pilot
valve is positively shifted at each end of
the diaphragm stroke by the diaphragm
plate's coming in contact with the end of
the pilot valve spool and pushing it into
position for shifting of the air distribu-
tion valve. The chambers are mani-
folded together with a suction and dis-
charge check valve for each chamber to
maintain flow in one direction through
the pump.
INSTALLATION
PROCEDURES
Position the pump as close as possi-
ble to the source of the liquid to be
pumped. Avoid long or undersize suc-
tion lines and use the minimum number
of fittings.
For permanent installation involving
rigid piping, install short flexible sec-
tions of hose between the pump and
piping. This reduces strains and per-
mits easier removal of the pump for
service when required. At time of insta-
llation, inspect all external gasketed
fasteners for looseness caused by
gasket creep. Tighten loose fittings
securely to prevent leakage.
AIR SUPPLY
Do not connect the unit to an air
supply in excess of 125 PSI (8 61 bars).
Install a shutoff valve in the air supply
line to permit removal of the unit for
servicing. When connecting an air sup-
ply of rigid piping, mount a section of
flexible line to the pump to eliminate
piping strain. In permanent installa-
tions, an air line filter IS recommended.
The weight of the air supply line and
of the filter must be supported by
some means other than the air valve
cap. Failure to provide support may
result in damage to the pump. A
pressure regulating valve should be
installed to prevent pressure from
exceeding recommended limits.
OPERATION
Your pump has been tested prior to
shipment and is ready for use as received
It is completely self-priming and no ini-
tial filling with fluid is required.
If the unit is to be totally submerged,
the air exhaust must be piped above
liquid level to prevent the liquid and
foreign material from entering the air
distribution valve mechanism.
Open the inlet air valve at least one
turn to allow sufficient cycling rate for
the pump to prime (30 to 60 cycles per
minute). After pumping starts, adjust
the inlet air valve for the desired pump
ing capacity. When further opening of
the inlet air valve increases cycling rate
without increasing the flow rate, the
pump is being starved of liquid due to
suction limitations. Further opening of
the air inlet valve will waste compressed
air. Set the inlet air valve for lowest
cycling rate that does not decrease flow
rate for most efficient operation.
LINCOLN
Section
-
B5
Page -
15D
FEB-95
FORM 402581