Metrohm 709 IC Pump - Manual (Page 38)

4 Notes – Maintenance – Faults
709 IC Pump
30
If by mistake an inlet valve 69 is installed instead of the outlet valve 70 ,
an extreme pressure buildup occurs within the working cylinder, which
is not detected by the pressure transducer and will destroy the piston
seal 68 !
6 Mounting the pump head
The components of the pump head 18 are reassembled as
shown in Fig. 9. The screw 60 and the piston cartridge 64 may
be tightened only by hand. On the other hand, the two valve
screw holders 71 are tightened with a wrench. The pump head is
then remounted on the pump (see section 3.2).
Inlet valveOutlet valve
6.2824.020/ 6.2824.010/
6.2824.090 6.2824.080
74
75
76
77
78
79
80
74
75
76
79
78
77
80
Fig. 11: Components of inlet valve 69 and
outlet valve 70
74 Valve housing
75 Sealing ring (black)
76 Sleeve
77 Sapphire sleeve
The bright side must point towards
the sapphire sphere
78 Sapphire sphere
79 Ceramic holder for sapphire
sphere
The large recess must point in the
direction of the sapphire sphere
80 Seal
The larger opening must point
outwards