ProMinent Beta BT4a - Change Diaphragm Warning

ProMinent
®
Page 26
Change diaphragm WARNING
• Always take suitable precautions when using hazardous chemicals!
• Ensure that the equipment is de-pressurised!
왘 Empty the liquid end (turn the unit upside down and let the feed chemical run out, rinse with a
suitable material: rinse the liquid end thoroughly after use with hazardous materials!).
왘 When Beta
®
is running set the stroke length to 0 % (the drive axis is then set).
왘 Switch off the Beta
®
.
왘 Unscrew the hydraulic connectors from the discharge and suction side.
왘 For versions with coarse/fine bleed function: firstly pull out the coarse/fine bleed (knob), then lift
off the cover from the liquid end using a screwdriver.
왘 Remove the screws (1).
For pump types 0220, 0232 and 0420 see the following page (4 holes on the diaphragm rim)!
Standard types 왘 Loosen the liquid end (2) and the top plate (4) from the pump housing (6) (loosen only!).
왘 Hold the housing (6) in one hand and with the other, clamp the diaphragm (3) between the
liquid end (2) and the top plate (4); release the diaphragm (3) from the drive spindle with a light
anticlockwise turn of the liquid end (2) and top plate (4).
왘 Unscrew the diaphragm (3) completely from the drive spindle.
왘 Remove the top plate (4) from the housing (6).
왘 Check the condition of the safety diaphragm (5) and replace if necessary.
왘 Push the safety diaphragm (5) onto the drive axle until the outer edge is flush with the pump
housing (6) - do not push further!
왘 Screw the new diaphragm (3) carefully up to the stop on the drive axis – this must be exact to
ensure correct metering!
왘 Screw the diaphragm (3) tight once more.
왘 Position the top plate (4) on the pump housing (6).
CAUTION
• The leakage hole must point downwards when the pump is fully assembled (see fig. 13)
• Position the top plate correctly on the pump housing. Do not distort the top plate on the
pump housing, otherwise the safety diaphragm (5) will not fit.
왘 Lay the diaphragm (3) into the top plate (4).
왘 Hold the top plate and screw the diaphragm (3) in a clockwise direction until it is firmly in
position (you will feel the resistance of the return spring).
CAUTION
• Do not overtighten the diaphragm (particularly on type 1601).
• The top plate must remain in position to prevent the safety diaphragm (5) from distorting.
왘 Adjust the stroke to 100 %.
왘 Position the liquid end (2) with the screws (1) on the diaphragm (3) and the top plate (4) (the
priming connector must point downwards once the pump is fully assembled). Screw on screws
(1) lightly and tighten (starting torque, see below).
왘 For versions with coarse/fine bleed function, ensure that the liquid end cover engages in the
liquid end, then push the coarse/fine bleed vent (knob) into the liquid end.
Repairs
BA_BE_021_07_08_GB2.p65 17.07.2008, 14:35 Uhr26