M&C TechGroup CSS-VC2 Operator's manual - Manual (Page 44)

44 Gas sampling and gas conditioning technology 14.1a-ME
The changing of diaphragm(s), valve plates and sealing rings is to be carried out in the following
order:

Remove pump head

Change the diaphragm

Change valve plates and sealing rings

Mount pump head.
Proceed as follows:
18.2.1 REMOVE PUMP HEAD TYPE N 3/5/9 KPE

Mark head cover 3 (with metal frame with N3/5), intermediate plate 2 and housing 1 with a felt
pen (M). This rules out parts being mounted incorrectly during subsequent assembly.
 Loosen the four head cap screws 4 and remove the head cover from the pump housing together
with the intermediate plate.
18.2.2 REPLACING THE DIAPHRAGM TYPE N 3/5/9 KPE

Move the structured diaphragm 9 by turning the fan wheel into the top dead centre position.

Lift the structured diaphragm on the opposite side edges, grip and unscrew counterclockwise.
Make sure that the adjusting washer(s) 11 do not fall from the threaded bolt of the structure
diaphragm into the housing.

Remove adjusting washer(s) 11 from the threaded bolt of the structure diaphragm and keep.

Inspect all parts for contamination and clean if necessary

Place the adjusting washer(s) onto the threaded bolts of the new structure diaphragm.

Move the connecting rod 13 into the top dead centre position.

Screw the new structure diaphragm with washer(s) onto the connecting rod (clockwise) and
hand-tighten.
18.2.3 VALVE PLATE CHANGE TYPE N 3/5/9 KPE

Separate head cover 3 (with metal frame with N3/5) from the intermediate plate 2.

Remove the valve plate 7 and the sealing rings 8 from the intermediate plate.

Check valve seat, intermediate plate and head cover for cleanliness; in the event of
unevennesses, scratches and corrosion, these parts are to be replaced.

Insert the new valve plate 7 into the valve seat of intermediate plate 2; the valve plates for
pressure and suction sides are identical; the same applies to upper and lower sides of the valve
plates.

By slight horizontal movement of the valve plates, ensure that these are not strained.

Insert sealing rings into the intermediate plate.
18.2.4 MOUNT PUMP HEAD TYPE N 3/5/9 KPE

Move structure diaphragm via fan wheel into top dead centre (dead point) position.

Place intermediate plate 2 on the housing with valve plates 7 and 8 as well as head cover 3 in
accordance with the marks (M).

Check its centering by slight lateral movement of the head cover.

Fit metal frame with N3/5.

Only slightly tighten 4 screws diagonally.