PFT G 54 E
Operating Instructions
09/2006
Knauf PFT GmbH & Co.KG
16
Checking the conveying pressure and backpressure
Checking the conveying pressure and backpressure:
¾
Connect a 10 m conveying hose.
¾
Connect a pressure tester with outlet tap to the end of the hose.
¾
Open the ball valve of the pressure tester.
¾
Switch on the machine and let it run with water (800 l/h) only (without dry material) until water
comes out of the tap (the hose has now been bled).
¾
Now connect the ball valve to the tap.
¾
Let the pump run against the closed tap until the pressure no longer rises.
¾
Switch off the machine.
¾
If the operating pressure is not reached, the maintenance-free pump must be replaced.
¾
Check the backpressure.
A backpressure of approx. 2/3 of the conveying pressure of the screw pump should now be
maintained in the hose.
NOTE:
The testing pressure with water should be approx. 5-10 bar above the anticipated mortar pumping
pressure!
An adverse position of the screw pump in the liner will result in water flowing back to the hopper
accompanied by a distinct gurgling noise. Switch the machine on and off repeatedly until you find
the position in which the screw pump seals.
NOTE:
1. The TWISTER D6-3 or D5-2.5 stator can be used up to an operating pressure of 30 or 25 bar.
2. The minimum conveying distance depends mainly on how the mortar flows. Heavy, coarse-
grained mortar does not flow well. Fluid mortars, filling compounds and floor screed flow well.
3. We recommend using thicker mortar hoses if an operating pressure of 30 or 25 bar is exceeded.
4. Use original spare parts to avoid malfunctions to the machine and excessive wear of the pump
motor, pump shaft and pump.
PFT
rotors
PFT
stators
PFT pump shafts
PFT mortar pressure hoses
PFT
clamps.
These components are compatible with one another and form a single constructive unit together
with the machine.
If you do not follow these recommendations, you will not only lose your warranty rights, but the
quality of the mortar will also suffer.
