Sandpiper S15 Non-Metallic User Manual download pdf (Page 10)

520-193-000 9/02 Model S15 Non-Metallic Design Level 2 Page 8

PRINCIPLE OF PUMP OPERATION

This ball type check valve pump is

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.

Alternate pressurizing and

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

check valve for each chamber,

maintaining flow 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

fittings to a minimum. Do not reduce the

suction line diameter.

For installations of rigid piping, 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 surge suppressor is

recommended to further reduce

pulsation in flow.

AIR SUPPLY

Air supply pressure cannot exceed

100 psi (7 bar). Connect the pump air

inlet to an air supply of sufficient capacity

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

piping to reduce strain to the piping. The

weight of the air supply line, regulators

and filters 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 flow as desired. If opening

the valve increases cycling rate, but does

not increase the rate of flow, cavitation

has occurred. The valve should be closed

slightly to obtain the most efficient air

flow to pump flow 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.

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Sandpiper S15 Non-Metallic User Manual Page 10

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