7.5.4 Install gas ballast valve
Required tools
● Allen key,
WAF 2
● Allen key,
WAF 3
● Circlip pliers,
J0
● Calibrated torque wrench (tightening factor ≤ 2.5)
Required consumables
● Operating fluid of rotary vane pump
Procedure
1. Lightly oil o-rings with operating fluid utilized.
2. Insert o-ring into groove in tappet.
3. Install second o-ring to tappet.
4. Install compression spring and washer.
5. Insert pre-assembled parts in valve housing.
6. Install circlip in valve housing recess.
7. Install circlip by pushing washer downwards against spring force, until circlip engages in valve
housing groove.
8. Insert cam plate.
9. Slide cam plate onto tappet.
– Take care with longitudinal groove in flange housing.
10. Extract tappet, against spring force.
11. Insert cylinder bolt in bore.
12. Rotate cam plate to move tappet to "1" position (open).
13. Install knob to tappet.
14. Tighten countersunk head screws.
– Tightening torque:
1.0 Nm
.
15. Position leaf spring on dowel pin (curvature facing housing).
16. Bias and fixate leaf spring with cylinder screw and washer.
– Tightening torque:
2.5 Nm
.
17. Install complete valve with O-ring.
18. Tighten cheese head screws.
– Tightening torque:
2.5 Nm
.
7.6 Changing the operating fluid type
Possibilities for changing the operating fluid type
The operating fluid type can be changed between mineral operating fluid –
P3
– and syn-
thetic operating fluid –
D1
– only.
It is not possible to change from
P3/D1
to
F4/F5
or vice versa.
Required consumables
● 3 times the filling quantity of the new operating fluid
Changing the operating fluid type
1. Change the operating fluid with the new operating fluid
twice
in order to rinse the vacuum pump.
2. Clean any accessories if necessary, such as oil mist filter or oil return, and replace their filter ele-
ments.
3. Fill the vacuum pump with operating fluid to one third full.
4. Note the currently used operating fluid type at a suitable location on the vacuum pump, e.g. on the
rating plate.
Maintenance
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