ABB SCC-E Operator's Manual page 20

Replacing the Diaphragm and Valve Plates,
Replace Diaphragm
and Valve Plates in the
Diaphragm Pump
(continued)
20
Step Action
12 Push the supporting bell, the distance ring(s) and the Belleville spring
in that order onto the threaded bolt of the new structural diaphragm.
The disk edge of the spring must be aligned with the structural
diaphragm.
13 Move the connecting rod 6 to its upper return point.
14 Screw the new structural diaphragm with support bell, distance ring(s)
and Belleville spring onto the connecting rod and hand-tighten it.
Replace valve plates:
15 Separate head cap 1 from the spacer plate 3.
16 Remove the valve plates 7 and the sealing rings 8 from the spacer
plate.
17 Check that the valve seats, spacer plate and head cap are clean; if
any of them display unevenness, scratches or corrosion they should
be replaced.
18 Insert the new valve plates in the valve seats on the spacer plate. The
valve plates for the compression and suction sides are identical; the
same applies to the upper and lower sides of the valve plates.
19 Move the valve plates gently in a horizontal plane to ensure that they
are not locked.
20 Insert sealing rings in the spacer plate.
Fit the pump head:
21 Using the fan impeller, move the structural diaphragm to its upper
dead point.
22 Place the spacer plate 3, the valve plates 7, sealing rings 8 and the
head cap 1 on the casing in accordance with the markings.
23 Check that the head cap is centered correctly by moving it gently
sideways.
24 Tighten the head cap screws 2 crosswise only slightly.
25 Check that the pump moves freely by turning the fan impeller.
26 Using the fan impeller, move the structural diaphragm to its upper
dead point.
27 Hand-tighten the head cap screws.
Re-install the diaphragm pump:
28 Attach the hose coming from the diaphragm filter outlet to the pump
inlet and the hose going to the flow meter inlet to the pump outlet.
29 If necessary connect the pump's power supply leads to the terminals
X5-4 and X5-5.
30 Insert the mounting plate with the diaphragm pump into the case and
fasten it.
31 Fasten the case cover and the front panel of the feed unit.
Take care not to bend or squash any hoses and not to damage
the temperature controller in the version with Peltier cooler.
Start the feed unit again:
32 Check that the gas feed paths have no leaks (see instructions on p. 21).
33 Switch on power supply to feed unit.
34 The sample gas flow should only be restarted after the lead time
period.
SCC-E Sample Gas Feed Unit Operator's Manual
continued
42/23-58 EN Rev. 1