What is a Diaphragm Pump?
The diaphragm pump is a type of positive displacement pump that works a bit differently than the EDDY Pump and centrifugal pumps. Instead of using the power of centrifugal force or the power of a tornado, a positive displacement pump works by utilizing an expanding and contracting chamber that pulls liquid into the pump when the diaphragm expands, then pushed through the pipeline when the diaphragm of the pump contracts. This method of operation creates a more pulsating flow from the discharge, compared to the more steady type of flow you’d see from the EDDY Pump.
Diaphragm Pump Mechanics
Diaphragm Pump Applications
Diaphragm pumps can be powered electrically as a shaft-driven pump and interestingly, are also often powered by compressed air. These are called air-operated diaphragm pumps. Diaphragm pumps are usually constructed with one or two chambers depending on the needs of the end user, with multiple chambers offering a more steady, higher flow rate.
Diaphragm pumps are wide used in many industries and can handle a wide range of liquids and slurries. Diaphragm Pumps are in the category of “positive displacement” pumps because their flow rates do not vary much with the discharge “head” (or pressure) the pump is working against (for a given pump speed). Diaphragm Pumps can transfer liquids with low to high viscosities and also liquids which contain a percentage of solids. Additionally, they are popular for moving corrosive or acidic liquids due to the fact that the pump can be constructed from a wide array of metals and materials resistant to corrosion.
Diaphragm Pumps Compared to the EDDY Pump
The EDDY Pump operates in a much different fashion. Instead of utilizing an expanding and contracting diaphragm and air chamber, the EDDY Pump uses a geometrically designed spinning rotor that generates the power of a tornado inside the pump. These principles create energy in the form of a synchronized swirling tornado of fluid through negative pressure, or the “eddy” effect. The need for a net positive suction head is not required, and no restraints are caused by cavitation due to excessive vibration. In addition, this negative pressure where the rotor shaft penetrates the pump casing eliminates premature packing failure, which often causes motor bearing failure due to exposure from the system fluid or outside contaminant.
These properties give the EDDY Pump a distinct advantage when pumping high viscosity fluids or fluids with high solids content with a good flow rate. Additionally, the EDDY Pump is not prone to clogs due to having no close or critical tolerances between the rotor and volute. This allows the EDDY Pump to pass solid objects easily, even up to 11 inches in diameter, ensuring the pump will provide reliable operation in the harshest of environments.
Advantages of the EDDY Pump
- Non-Clog Pump Design – The EDDY Pump’s open rotor design with high tolerances allow anything that will go into the intake to be passed through the discharge without issues. This translates to a significant amount of solids and debris that passes through without clogging the pump.
- High Solids Handling – Able to pump up to 70% solids by weight
- High Viscosity and Specific Gravity Handling
- High Abrasives Handling – Ultra recessed rotor creates eddy current that keeps abrasive material away from critical pump components
- No Critical Tolerances – The tolerance between the rotor and the volute easily allows the passage of a man’s arm , while the tolerance in a centrifugal pump is significantly less. In a 2-inch to 10-inch EDDY Pump the tolerance ranges from 1-9 inches.
- Low Maintenance
- Minimal Downtime
- Low Ownership Costs
- No need for steel high-pressure pipeline which is costly and dangerous
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