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Model dmf2r dmf2s, 2" flap valve pump type 5, Service and operating manual – SANDPIPER DMF2S User Manual

Page 7

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dmf2dl5sm-rev0614

Model DMF2 Page 5

PRINCIPLE OF PUMP OPERATION

This flap swing valve pump is powered by compressed air and is a 1:1

pressure ratio design. It alternately pressurizes the inner side of one diaphragm

chamber, while simultaneously exhausting the other inner chamber. This

causes the diaphragms, which are connected by a common rod, to move

endwise. Air pressure is applied over the entire surface of the diaphragm,

while liquid is discharged from the opposite side. The diaphragm operates

under a balanced condition during the discharge stroke, which allows the unit

to be operated at discharge heads over 200 feet (61 meters) of water head.

Since the diaphragms are connected by a common rod, secured by plates

to the center of the diaphragms, one diaphragm performs the discharge stroke,

while the other is pulled to perform the suction stroke in the opposite chamber.

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. This will maximize diaphragm life.

Alternate pressuring and exhausting of the diaphragm chamber is performed by means of an externally mounted,

pilot operated, four-way spool type air distribution valve. When the spool shifts to one end of the valve body, inlet air

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 porting of chambers is reversed. The air distribution valve spool is moved by

an internal pilot valve which alternately pressurizes one side of the air distribution valve spool, while exhausting the

other side. The pilot valve is shifted at each end of the diaphragm stroke by the diaphragm plate coming in contact

with the end of the pilot spool. This pushes it into position for shifting of the air distribution valve.

The chambers are manifolded together with a suction and discharge flap-type check valve for each chamber,

maintaining flow in one direction through the pump.

INSTALLATION & START-UP

Locate the pump as close to the product being pumped as possible, keeping suction line length and number of

fittings to a minimum. Do not reduce line size.

For installations of rigid piping, short flexible sections of hose should be installed between pump and piping. This reduces

vibration and strain to the piping system. A Warren Rupp Tranquilizer

®

surge suppressor is recommended to further reduce

pulsation in flow.

This pump was tested at the factory prior to shipment and is ready for operation. It is completely self-priming

from a dry start for suction lifts of 20 feet (6.096 meters) or less. For suction lifts exceeding 20 feet of liquid, fill the

chambers with liquid prior to priming.

AIR SUPPLY

Air supply pressures cannot exceed 125 psi (8.61 bar). Connect the pump air inlet to an air supply of sufficient capacity

and pressure required for desired performance. When the air line is solid piping, use a short length of flexible hose [not less

than 3/4" (19mm) in diameter] between pump and piping to eliminate strain to pipes.

Heavy Duty Flap

SERVICE AND OPERATING MANUAL

Model DMF2R

DMF2S

2" Flap Valve Pump

Type 5

DRILLER’S MUD SERIES

A WARREN RUPP PUMP BRAND

II 2GD T5

See pages 20 & 21

for ATEX ratings

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