page 107 of 121
➨
Put on head covers (C).
+
Pay attention to the correct orientation of
the head covers (see figure below).
+
Make sure that the diaphragms stay cen-
tered with respect to the bores so that they
will become clamped uniformly between
housing (I) and head covers (C).
➨
Put the valves (B) in place. See figure below 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 opposite direction
as the valve at the inlet side. Round orifice under the valve tongue (2).
outlet
side (2)
inlet
side (1)
Scheme of pump heads with head covers and valves
