- 7 -
INSTALLATION
FLEXIBLE COUPLING ALIGNMENT
There are two types of misalignment encountered with flexible couplings, angular misalignment
and parallel misalignment. To check for angular misalignment, insert a taper gauge or feeler
gauge at four places located 90° apart around the coupling as shown. Coupling halves will be
aligned when the measurements are the same at all check points.
To check parallel misalignment, place a straightedge across the coupling half rims at the top,
bottom and both sides, making sure that the straightedge is parallel to the motor and pump shafts.
The coupling will be properly aligned when the straightedge rests evenly on the coupling rims at all
check points.
Correct alignment is obtained by use of shims under the motor mounting feet. Remember that
adjustments made in one direction may affect alignment in another direction. Therefore, several
checks of both angular and parallel alignment should be made.
SEAL FLUSHING - PRED PUMPS
All PRED Series Pumps have double-static o-ring product seals which must have flush liquid
applied to them.
Install seal flush as shown below. Use pressurized flush with products that tend to build up
between seal faces; latex, PVA, etc. Pressure in seal chamber should exceed pump discharge
pressure by at least 10 PSI.
Note:
Your Positive Rotary Pump is designed for either clockwise or counterclockwise rotation.
It should be noted that product flow will be in the same direction as the drive shaft rotation.
Connect the flexible coupling, start the pump and operate it until temperatures are stabilized. The
unit should then be shut down and the alignment immediately rechecked.
Note:
If corrections in alignment are necessary at this time, be sure to check in all directions
after making adjustments.
Figure Four
Seal Flush
Liquid Outlet
to Drain
1
/
8
"- 27 NPT
Seal Flush
Liquid Inlet
SEAL FLUSH PIPING
PRED PUMPS WITH
ATMOSPHERIC FLUSH
Adjustable valve
to obtain liquid
flow to both seals
Figure Five
Seal flush liquid outlet to drain
adjust valve to give flow to drain
while maintaining flush pressure
1
/
4
Tubing
SEAL FLUSH PIPING
PRED PUMPS WITH
PRESSURIZED FLUSH
1
/
8
- 27 NPT
Seal flush liquid inlet
adjust pressure to
exceed pump
discharge pressure
Recommended Seal
Flush Flow Rate is
approximately 3 gallons
per hour. For elevated
temperature
applications, flow rate
must be sufficient to
maintain seal
temperature of 175°F or
less.
1
/
4
" Tubing
