VACUUBRAND MZ 2 VARIO-SP - Manual (Page 43)

page 43 of 51
Assembling the pump heads
➨
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 cover (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) and O-rings (B) in place. See figure for the correct
position of the valves:
Inlet side of pump head (1): The valve tongue points at the kidney-
shaped orifice in the valve seat.
Outlet side of pump head (2): 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 cover
for correct orientation. The nib at the head cover has to lock into the
notch of the housing cover.
(2) (1)
➨
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).
Replace diaphragms and valves of the opposite side of
the pump in the same way!