Principle Of Pump Operation - Sandpipper S05 Operating And Service Manual

Principle of Pump Operation

Air Line
discharged
Fluid
discharge
Stroke
www
s05mdl1sm-rev1113
primed
Fluid
. .
sandpiperpump com
Air-Operated Double Diaphragm (AODD) pumps are powered
by compressed air, nitrogen or natural gas.
The main directional (air) control valve
compressed air to an air chamber, exerting uniform pressure
over the inner surface of the diaphragm
the exhausting air
is directed through the air valve assembly(s) to an exhaust
port .
④
As inner chamber pressure
(p2)
pressure
together creating discharge on one side and suction on the
opposite side. The discharged and primed liquid's directions
are controlled by the check valves (ball or flap)
The pump primes as a result of the suction stroke. The
suction stroke lowers the chamber pressure
the chamber volume. This results in a pressure differential
necessary for atmospheric pressure
through the suction piping and across the suction side check
valve and into the outer fluid chamber
PUMP INSTALLATION AREA
Suction (side) stroking also initiates the reciprocating
Suction
Stroke
(shifting, stroking or cycling) action of the pump. The suction
diaphragm's movement is mechanically pulled through its
stroke. The diaphragm's inner plate makes contact with an
1" DIAMETER AIR
actuator plunger aligned to shift the pilot signaling valve.
EXHAUST PIPING
Once actuated, the pilot valve sends a pressure signal to the
opposite end of the main directional air valve, redirecting the
compressed air to the opposite inner chamber.
SUBMERGEd IllUSTRATION
LIQUID
LEVEL
SUCTION
LINE
Pump can be submerged if the pump materials of construction
are compatible with the liquid being pumped. The air exhaust
must be piped above the liquid level. When the pumped product
source is at a higher level than the pump (flooded suction
condition), pipe the exhaust higher than the product source to
prevent siphoning spills.
LIQUID
LEVEL
SUCTION
LINE
distributes
①
. At the same time,
②
from behind the opposite diaphragm
③
(p1)
exceeds liquid chamber
, the rod connected diaphragms shift
⑤
⑥
(p3)
(p4)
to push the fluid
.
⑦
SAFE AIR
EXHAUST
DISPOSAL
AREA
MUFFLER
MUFFLER
1" DIAMETER AIR
EXHAUST PIPING
MUFFLER
1" DIAMETER AIR
EXHAUST PIPING
Model S05 Metallic •
orientation.
increasing
6