hdb2smdl3sm-rev0217
Model HDB2 Page 4
PLEASE NOTE!
The photos shown in this manual are for general instruction only. YOUR SPECIFIC
MODEL MAY NOT BE SHOWN. Always refer to the parts list and exploded view
drawing for your specific model when installing, disasembling or servicing
your pump.
PRINCIPLE OF PUMP OPERATION
This ball check valve pump is powered by compressed air and is a 1:1 pressure ratio
design. The pump is alternately pressurize through the inner side of one diaphragm
chamber, while simultaneously exhausting the other inner chamber. Air pressure
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 dis-
charged from the opposite side. The diaphragm operates under a balanced condition
during the discharge stroke, and the unit can be operated at discharge heads over
200 feet (61 meters) of water head.
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 air. 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 the pilot valve into
position for shifting of the air distribution valve.
The chambers are manifolded together with a suction and discharge check valve
for each chamber which maintains flow in one direction through the pump.
INSTALLATION & START-UP
Locate the pump as close to the product being pumped as possible. Keep 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 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.
Model HDB2
Type 3
SERVICE & OPERATING MANUAL
Original Instructions
II 2GD T5
See pages 18 & 19
for ATEX ratings
