Diaphragm Vacuum Pumps UN012, UN024, UN036_I
Servicing
17
Tightening torque:
UN012
: 7 Nm
UN024
: 8 Nm
UN036, UN036.0
: 13 Nm
d) Changing valve plates and sealing rings
1. Check that intermediate plate and head plate is clean (see
section 6). If damage, distortion, or corrosion is evident on
these parts, they should be replaced.
2. Place the intermediate plate (
3
) on the support ring (
1
) in the
position indicated by the felt tip pen mark.
3. Lay the new valve plates (
11
) onto the valve seats of the
intermediate plate (
3
).
The valve plates are identical for the pressure and suction
side; the position of the valve plates is determined by the
shape of the valve seats
4. Fit the new O-rings (
10
) in the intermediate plate (
3
).
e) Refitting pump head
1. Place the head plate (
4
) on the intermediate plate (
3
) in the
position indicated by the felt-tip pen marking.
2. Place spring washers (
5
).
For position see fig. 7.
3. Place the cap nuts (
6
) in position, and tighten to the torque
value shown below.
UN012
: 2 Nm
UN024
: 5 Nm
UN036, UN036.0
: 7 Nm
f) Final
steps
1. Refit the head insulation.
2. .11 designs only (pumps with thermostatic-regulated head
heating) and .26 designs (pumps with heated heads;
electronically controlled):
Slide the protective tube into the bore of the base plate.
Tighten the strain relief on the underside of the head insulation
or on the compressor housing (UN036.0).
3. Reconnect the pump to the electricity supply.
If you have any questions about servicing call our technical adviser
(see last page for contact telephone number).
