s30nmdl2sm-REV0808
Model S30 Non-Metallic Page 8
PRINCIPLE OF PUMP OPERATION
This ball type check valve pump
is powered by compressed air and is
a 1:1 ratio design. The inner side of
one diaphragm chamber is alternately
pressurized while simultaneously
exhausting the other inner chamber.
This causes the diaphragms, which
are connected by a common rod
secured by plates to the centers of the
diaphragms, to move in a reciprocating
action. (As one diaphragm performs the
discharge stroke the other diaphragm is
pulled to perform the suction stroke in
the opposite chamber.) Air pressure is
applied over the entire inner surface of
the diaphragm while liquid is discharged
from the opposite side of the diaphragm.
The diaphragm operates in a balanced
condition during the discharge stroke
which allows the pump to be operated
at discharge heads over 200 feet (61
meters) of water.
For maximum diaphragm life, keep
the pump as close to the liquid being
pumped as possible. Positive suction
head in excess of 10 feet of liquid
(3.048 meters) may require a back
pressure regulating device to maximize
diaphragm life.
A l t e r n a t e p r e s s u r i z i n g a n d
exhausting of the diaphragm chamber
is performed by an externally mounted,
pilot operated, four way spool type
air distribution valve. When the spool
shifts to one end of the valve body, inlet
pressure is applied to one diaphragm
chamber and the other diaphragm
chamber exhausts. When the spool
shifts to the opposite end of the valve
body, the pressure to the chambers
is reversed. The air distribution valve
spool is moved by a internal pilot valve
which alternately pressurizes one end
of the air distribution valve spool while
exhausting the other end. The pilot valve
is shifted at each end of the diaphragm
stroke when a actuator plunger is
contacted by the diaphragm plate. This
actuator plunger then pushes the end
of the pilot valve spool into position to
activate the air distribution valve.
The chambers are connected with
manifolds with a suction and discharge
c h e ck va l ve fo r e a c h c h a m b e r,
maintaining fl ow in one direction through
the pump.
INSTALLATION AND START-UP
Locate the pump as close to the
product being pumped as possible.
Keep the suction line length and number
of fi ttings to a minimum. Do not reduce
the suction line diameter.
For installations of rigid piping,
short sections of fl exible hose should
be installed between the pump
and the piping. The flexible hose
reduces vibration and strain to the
pumping system. A surge suppressor
is recommended to further reduce
pulsation in fl ow.
AIR SUPPLY
Air supply pressure cannot exceed
100 psi (7 bar). Connect the pump
air inlet to an air supply of suffi cient
capacity and pressure required for
desired performance. When the air
supply line is solid piping, use a short
length of fl exible hose not less than ½"
(13mm) in diameter between the pump
and the piping to reduce strain to the
piping. The weight of the air supply line,
regulators and fi lters must be supported
by some means other than the air
inlet cap. Failure to provide support
for the piping may result in damage
to the pump. A pressure regulating
valve should be installed to insure
air supply pressure does not exceed
recommended limits.
AIR VALVE LUBRICATION
The air distribution valve and the pilot
valve are designed to operate WITHOUT
lubrication. This is the preferred mode
of operation. There may be instances
of personal preference or poor quality
air supplies when lubrication of the
compressed air supply is required.
The pump air system will operate with
properly lubricated compressed air
supply. Proper lubrication requires the
use of an air line lubricator (available
from Warren Rupp) set to deliver one
drop of SAE 10 non-detergent oil for
every 20 SCFM (9.4 liters/sec.) of air
the pump consumes at the point of
operation. Consult the pump’s published
Performance Curve to determine this.
AIR LINE MOISTURE
Water in the compressed air supply
can create problems such as icing or
freezing of the exhaust air, causing
the pump to cycle erratically or stop
operating. Water in the air supply can
be reduced by using a point-of-use
air dryer to supplement the user’s air
drying equipment. This device removes
water from the compressed air supply
and alleviates the icing or freezing
problems.
AIR INLET AND PRIMING
To start the pump, open the air
valve approximately ½ to ¾ turn. After
the pump primes, the air valve can be
opened to increase air fl ow as desired.
If opening the valve increases cycling
rate, but does not increase the rate
of fl ow, cavitation has occurred. The
valve should be closed slightly to
obtain the most effi cient air fl ow to pump
fl ow ratio.
BETWEEN USES
When the pump is used for materials
that tend to settle out or solidify when
not in motion, the pump should be
flushed after each use to prevent
damage. (Product remaining in the
pump between uses could dry out or
settle out. This could cause problems
with the diaphragms and check valves
at restart.) In freezing temperatures
the pump must be completely drained
between uses in all cases.
Summary of Contents for S30
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