38
Maintenance and Care
P 2.1S/P 4.1S user manual V6870, version 3.1
Installing the Check Valves
Insert the check valves in the direction of the flow. The notch of the check valve
points downward. Insert the NP check valves in the direction of the flow. The
arrow on the NP check valve points upward.
Prerequisite:
The check valves have dried.
Device defect
Damage to the pump head caused by overtightened capillary fittings. Note the
torque of the fittings.
Use 5 Nm torque for stainless-steel fittings.
Use 1 Nm torque for PEEK fittings.
Next steps:
Re-install the pump head.
Process
Figure
1. Insert the check valves
1
in such a
way that the notch of the check
valve
2
points downward.
2. Screw in inlet and outlet fittings
and tighten them with a torque
wrench and the respective torque.
Fig. 26
Check valve
2
1
