Description
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Description
3.1
Design
The diaphragm pump consists of a pump body
and a drive motor.
The pump casing contains the drive unit and two
pump heads. Each pump head contains a dia-
phragm and the work valves. Both pump heads
are arranged opposite each other.
The pump heads are driven via an eccentric shaft
with a connecting rod.
1 to 2 stage pumps are supplied, depending upon
the circuitry of the pump heads.
Fig. 1 Diaphragm pump MP 601 E
3.2
Principle of Operation
Motor, eccentric shaft and connecting rod set the diaphragms in stroke movement. This
changes the size of the space between the diaphragms and pump head (pump chamber).
Increasing the size of the pump chamber opens the inlet valve while the outlet valve is
closed (intake process).
Decreasing the size of the pump chamber ejects the gas through the outlet valve.
The valves are actuated by the gas being pumped. A large proportion of fluid in the dia-
phragm pump minimizes the pumping efficiency.
3.3
Gas ballast
When condensable vapours are pumped, they
may be compressed above the saturated vapour
pressure and condense.
Opening the gas ballast valve
(A)
in the
suction line allows air to flow into the pump cham-
ber. This prevents condensation and flushes the
pump clear.
Operation leads to increasing the ultimate pres-
sure and the operating temperature.
The gas ballast valve is only provided as standard
for MPC type diaphragm pumps. The fitting into
other pump types is an option or must be specified
in the supply contract.
Fig. 2 Gas ballast valve on the
MPC 301 Z
3.4
Areas of Application
Diaphragm Pumps are intended to:
Pumping and compressing neutral and aggressive gases and vapours.
Generating a vacuum down to an ultimate pressure < 8 mbar.
Use in physical and chemical laboratories in trade and industry.
Use for vacuum filtration, vacuum distillation and vacuum drying, and other vacuum tech-
nology applications.
(A)