Pfeiffer DUO 3 - Dismantling and cleaning gas ballast valve with inert gas connection

10. Determine the curve of the valve flap and place the valve flap in the screw cap with the curved
side facing downwards.
11. Screw the screw cap and the valve housing hand tight.
12. Install the complete valve with o-ring in the vacuum pump.
13. Tighten the countersunk head screws (2x).
–
Tightening torque: 1.0 Nm.
7.5.2 Dismantling and cleaning gas ballast valve with inert gas connection
Avoiding shearing of hexagon socket screws
Fit the hose connection G 1/8" on the valve housing before you fit the valve housing on the
vacuum pump, in order to prevent shearing of the hexagon socket screws.
Required tools
●
Allen key, WAF 2.5
●
Allen key, WAF 5
●
Open-end wrench, WAF 14
●
Snap ring pliers, J1
●
Calibrated torque wrench (tightening factor ≤ 2.5)
A
1
2
3
4
6
11
10
9
5
7
8
Fig. 17: Gas ballast valve with inert gas connection
A Arched side 6 Screw, 2×
1 Circlip 7 O-ring
2 Spindle 8 Hose connection
3 O-ring, 2× 9 Valve flap
4 O-ring 10 Screw cap
5 Valve housing 11 O-ring
Dismantling gas ballast valve with inert gas connection
1. Remove the hose of the inert gas line.
2. Disconnect the valve housing from the vacuum pump.
–
Be careful with the o-ring.
3. Unscrew the hose connection the from valve housing.
4. Unscrew the screw cap from the valve housing.
Maintenance
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