Replacing The Diaphragm - vacuubrand BVC control Instruction Manual

Replacing the diaphragm

page 61 of 76
➨ Unscrew four screws at the pump head, pay-
ing attention to washers.
Remove housing cover.
➨ Unscrew union nut and remove hose from
elbow fitting. Remove housing cover insert
with elbow fitting.
➨ Note position of valves.
+ Replace valves if necessary.
Use petroleum ether or industrial solvent to
remove deposits. Do not inhale vapors.
➨ Remove head cover and valves.
+ Check diaphragm for damage and replace if
necessary.
+ Never remove parts by using a pointed or
sharp-edged tool (e.g., screw driver), we
recommend to use a rubber mallet or com-
pressed air (to be blown carefully into port).
➨ Lift diaphragm carefully sidewise.
+ Never use a pointed or sharp-edged tool to
lift the diaphragm.
➨ Use the diaphragm key to grip the diaphragm
support disc below the diaphragm. Press
down the diaphragm clamping disc to bring
the diaphragm to its lowest oscillating posi-
tion. Unscrew diaphragm support disc with
diaphragm and diaphragm clamping disc.