520-211-000 2/01 Model S05 Non-Metallic Design Level 1 Page 6
PRINCIPLE OF PUMP OPERATION
This ball type check valve pump is
poweredbycompressedairand is a1:1
ratio design. The inner side of one
diaphragm chamber is alternately
pressurized while simultaneously
exhaustingtheotherinnerchamber.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.(Asonediaphragm 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
dischargedfromtheoppositesideofthe
diaphragm.The diaphragm operatesin
a balanced condition during the
dischargestrokewhichallowsthepump
tobe operated atdischarge heads over
200feet (61 meters) of water.
For maximum diaphragm life, keep
the pump as close to the liquid being
pumped as possible. Positive suction
headinexcessof10feetof liquid (3.048
meters) may require a back pressure
regulating device to maximize
diaphragmlife.
Alternate pressurizing and
exhausting of the diaphragm chamber
isperformed by anexternally mounted,
pilot operated, four way spool type air
distributionvalve.Whenthe 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.Theairdistributionvalvespool
is moved by a internal pilot valve which
alternately pressurizes one end of the
air distribution valve spool while
exhaustingtheotherend.Thepilotvalve
is shifted at each end of the diaphragm
stroke when a actuator plunger is
contacted by the diaphragm plate. This
actuatorplungerthen pushestheend of
the pilot valve spool into position to
activatetheair distributionvalve.
The chambers are connected with
manifolds with a suction and discharge
check valve for each chamber,
maintainingflowinonedirectionthrough
thepump.
INSTALLATION AND START-UP
Locate the pump as close to the
productbeing pumped aspossible.Keep
the suction line length and number of
fittingsto a minimum.Do not reducethe
suctionline diameter.
Forinstallations of rigidpiping, short
sections of flexible hose should be
installed between the pump and the
piping. The flexible hose reduces
vibration and strain to the pumping
system. A Warren Rupp DA05 Surge
Dampener is recommended to further
reducepulsation in flow.
AIR SUPPLY
Air supply pressure cannot exceed
100 psi (7 bar). Connect the pump air
inlettoanairsupplyofsufficientcapacity
and pressure required for desired
performance. When the air supply line
is solid piping, use a short length of
flexible hose not less than ½" (13mm)
in diameter between the pump and the
pipingtoreduce strain tothepiping. The
weight of the air supply line, regulators
and filters must be supported by some
meansotherthantheairinletcap.Failure
to provide support for the piping may
resultin damagetothepump.Apressure
regulating valve should be installed to
insure air supply pressure does not
exceedrecommended limits.
AIRVALVE LUBRICATION
Theairdistributionvalveandthepilot
valveare designedtooperateWITHOUT
lubrication.Thisisthepreferred 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
useofanairlinelubricator(available from
WarrenRupp) set to deliver onedrop 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
PerformanceCurveto determinethis.
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
dryertosupplementthe user’s airdrying
equipment. This device removes water
from the compressed air supply and
alleviatestheicingorfreezing problems.
AIR INLET AND PRIMING
Tostart thepump, open theair valve
approximately ½ to ¾ turn. After the
pumpprimes,theairvalvecanbeopened
toincreaseairflowasdesired.Ifopening
thevalve increases cyclingrate,butdoes
not increase the rate of flow, cavitation
hasoccurred.Thevalveshouldbeclosed
slightly to obtain the most efficient air
flowto pumpflow ratio.
BETWEEN USES
Whenthepump is usedformaterials
that tend to settle out or solidify when
notinmotion,thepumpshouldbeflushed
after each use to prevent damage.
(Productremaininginthepumpbetween
uses could dry out or settle out. This
could cause problems with the
diaphragmsandcheckvalvesatrestart.)
Infreezingtemperaturesthe pump must
becompletely drainedbetween uses in
all cases.
