M&C TechGroup MP26-H1 Operator's manual - Manual (Page 15)

15
Gas sampling and gas conditioning technology 5-2.1.5-ME
Parts and tools required:

Valve plates, sealing rings (2 each pump head) and structured diaphragm(s)

Screwdriver no. 1
N O T E !
Always change valve plates, diaphragm and sealing rings at the same time.
Change the diaphragm, valve plates and sealing rings in the following sequence:
15.1 REMOVING THE DIAPHRAGM AND VALVE PLATES
Before removing the valve plates or the diaphragm the heater assembly must be removed from the
pump head.

Unscrew the knurl nuts at the top of the pump head and take the cover off.

Unscrew the 2 ea outer hexagon screws at the bottom plate of the pump head and take the
complete heater assembly off the pump head.
Removing the diaphragm

Mark the position between housing A diaphragm B and pressure plate C;

Loosen the 6 hexagon screws D and remove the pressure ring E;

Loosen the valve body F and G;

Loosen the 4 hexagon screws H and remove the pressure plate C and the diaphragm head B;

Unscrew the diaphragm K by hand out of the tapping hole of the rod L (counter-clockwise);

Loosen the 4 screws M and remove the cover N;

Screw the new diaphragm K into the rod L hand-tight;

Turn the flywheel P until the rod L is in a central Position. Control that the bulge of the dia-
phragm K fits to the groove of housing A;

Fix the diaphragm head B and the pressure plate C according to the mark;

Fix the 4 hexagon screws H constantly over cross until the plate springs R are fIat;

Turn the flywheel P and check whether it works proper;

Mount the cover N;

Change the 0-ring S at the valve body F on the pressure side;

Change the valve plate T. Check whether the protection ring U is in the right position and the 6
layers of the valve plate T point to the top;

Screw in the valve bodies F and tighten them in a moderate way;

Change the 0-ring S on the sucking side;

Remove the valve plate T and change it with a new one. Check whether the protection ring U is
in the right position and the 6 Iayers of the valve plate T point to the bottom;

Screw in the valve bodies G and tighten them in a moderate way;

Put on the pressure ring E and tighten the 6 hexagon screws.