Air Kits And Wet Kits Diaphragm Pump Parts Vacuum Pump Diaphragm
We have all parts of air operated diaphragm pump
A diaphragm pump (also known as a Membrane pump, Air Operated Double Diaphragm Pump (AODD) or Pneumatic Diaphragm Pump) is a positive displacement pump that uses a combination of the
reciprocating action of a rubber, thermoplastic or teflondiaphragm
and suitable valves on either side of the diaphragm (check valve,
butterfly valves, flap valves, or any other form of shut-off
valves) to pump a fluid.
There are three main types of diaphragm pumps:
- Those in which the diaphragm is sealed with one side in the fluid
to be pumped, and the other in air or hydraulic fluid. The
diaphragm is flexed, causing the volume of the pump chamber to
increase and decrease. A pair of non-return check valves prevent
reverse flow of the fluid.
- Those employing volumetric positive displacement where the prime
mover of the diaphragm is electro-mechanical, working through a
crank or geared motor drive, or purely mechanical, such as with a
lever or handle. This method flexes the diaphragm through simple
mechanical action, and one side of the diaphragm is open to air.
- Those employing one or more unsealed diaphragms with the fluid to
be pumped on both sides. The diaphragm(s) again are flexed, causing
the volume to change.
When the volume of a chamber of either type of pump is increased
(the diaphragm moving up), the pressure decreases, and fluid is
drawn into the chamber. When the chamber pressure later increases
from decreased volume (the diaphragm moving down), the fluid
previously drawn in is forced out. Finally, the diaphragm moving up once again draws fluid into the
chamber, completing the cycle. This action is similar to that of
the cylinder in an internal combustion engine. Diaphragm Pumps
deliver a hermetic seal between the drive mechanism and the
compression chamber, allowing the pump to transfer, compress, and
evacuate the medium without a lubricant.
Diaphragm pump characteristics:
- have good suction lift characteristics, some are low pressure pumps
with low flow rates; others are capable of higher flow rates,
dependent on the effective working diameter of the diaphragm and
its stroke length. They can handle sludges and slurries with a
relatively high amount of grit and solid content.
- suitable for discharge pressure up to 1,200 bar
- have good dry running characteristics.
- can be used to make artificial hearts.
- are used to make air pumps for the filters on small fish tanks.
- can be up to 97% efficient.
- have good self priming capabilities.
- can handle highly viscous liquids. A viscosity correction chart can
be used as a tool to help prevent under-sizing AOD pumps
The diaphragm pump was invented in 1857 by Jacob Edson. Full
production of the first pumps began two years later under the name
of the Edson Corporation, located in Boston, Massachusetts. The
company continues to thrive today in New Bedford, Massachusetts. 
Small mechanically activated diaphragm pumps are also used as air
compressors and as a source of low-grade vacuum. Compared to other
compressors, these pumps are quiet, cheap and, most importantly,
have no moving parts in the airstream. This allows them to be used
without added lubrication in contact with the air, so the
compressed air produced can be guaranteed clean.