Diaphragm pumps are no longer unique in the stable of most established pump companies servicing the needs of industry.
The diaphragm pump is a positive displacement pump in that the diaphragm chambers deliver a set volume on each stroke. Very efficient and accurate chemical dosing can be achieved using a diaphragm pump. (see our dosing pump tag)
In terms of an air pump as such, the most common type is the air operated diaphragm pump, used in all industries. Our GM AIR series coupled to a pneumatic controller is also ideal for accurate chemical dosing. The GM pumps AIR series controller kits can be retro fitted to any air operated double diaphragm pump brand or make. (Aro, Graco, Yamada, Wilden, Blagdon, Versamatic, Sandpiper etc)
There are three main types of diaphragm pumps:
- Those in which the diaphragm is sealed between two chambers, one side in the fluid to be pumped, and the other in air side. The diaphragm is flexed, causing the volume of the pump chamber to increase and decrease. A non-return check valves ont he suction and discharge port of the diaphragm chamber prevent reverse flow of the fluid.
- Those employing volumetric positive displacement where the prime mover of the diaphragm is via a mechanical driver. Electric motor or fuel driven engine 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 mechanically activated instead of by pneumatic action. 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.
- 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.
Jacob Edson is credited with inventing the diaphragm pump in 1857. First pumps began to be produced two years later under the name of the Edson Corporation, located in Boston, Massachusetts. The company continues to produce and thrive today in New Bedford, Massachusetts. (see note 1 below)
GM Pumps cc stocks and services both pneumatic double diaphragm pumps and more recently has begun promoting the Edson electric motor and engine driven double and single diaphragm as well as the Edson manual (hand operated) diaphragm pump ranges.
Features of Diaphragm pumps:
- Can run dry, without flow, for considerable periods of time without damage.
- Have good suction lift characteristics, typlically up to 8 or even 9 meters at sea level.
- Excellent dry priming capability diaphragm pumps are capable of priming themselves from a dry start.
- Handle sludges and slurries with a relatively high amount of grit and solid content.
- Handle highly viscous liquids. A viscosity correction chart can be used as a tool to help prevent under-sizing AODD pumps.
- Available for industrial, chemical and hygienic applications
The pumps are commonly used in industries where pumps would be required to operate without an operators continued attention, where there is a very real chance that the pump can run dry or where the air pump will need to handle slurries and sludges.
The simple and safe operation of air operated double diaphragm pumps with pneumatic control means that this pump is ideal for operating in zone one areas where there is demand for intrinsically safe operation. The pump is simply turned on or off by either closing the fluid discharge valve anywhere on the discharge line or by regulating the air supply.
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Note 1 (http://books.google.co.za/books?id=ancqAQAAIAAJ&q=pump+jacob+edson&dq=pump+jacob+edson&hl=en&sa=X&ei=gW6_UcCCKbit4AOuwYGYBQ&redir_esc=y)
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