VACUUBRAND MV 2 NT VARIO - Manual (Page 90)

page 90 of 106
Assembling the pump heads
(1)
(K)
➨
Bring the diaphragms (F) into a position, in
which they are in contact with the housing
(J) and centered with respect to the bore.
➨
Put on head covers (D).
+
Pay attention to the correct orientation of the
head covers: Align the nib at the head cover
(D) with the notch of the housing cover (A).
+
Make sure that the diaphragm stays cen-
tered with respect to the bore so that it will
become clamped uniformly between hous-
ing (J) and head cover (D).
➨
Put the valves (C) an O-rings (B) in place. See figure for the correct
position of the valves:
Inlet side of pump head: The valve tongue points at the kidney-shaped
orifice in the valve seat (1).
Outlet side of pump head: The valve is oriented the same direction as
the valve at the inlet side.
➨
Put on housing cover (A).
+
If it is not possible to position the housing cover, check the head cov-
ers for correct orientation. The nib at the head cover has to lock into
the notch of the housing cover.
➨
Install the connecting tube (K) under the pump between the two housing
covers. Pay attention to the correct positions of the seal rings (replace
if damaged) in the grooves at the ends of the tube. Fit the connecting
tube in the bore of the housing cover. After assembly the connecting
tube may have some play.
➨
Screw in the Allen head screws at the head
covers diagonally at first slightly with a 5
mm wide Allen key, then tighten.
+
Recommended torque: 8.9 ft . lb
f
(12 Nm).