Progressing Cavity Pumps have similar characteristics of a piston pump, such as sealed cavities and operational similarities such as being able to pump at extremely low rates, even to high pressures, and revealing the effect to be purely positive displacement. Today, we’re discussing Continental Pumps in GA and how progressive cavity pumps work.
Progressing cavity pumps are also known as an eccentric screw pump due to the motion of the rotor. Rotors are made of hardened steel or stainless steel and are covered with chrome plating to provide resistance to corrosive and abrasive materials.
Some liquids affect the chrome plating, and in those applications, a non-plated rotor should be used. Stators are metal tubes with internally molded cavities of natural or synthetic rubber. The rotor seals tightly against the flexible rubber stater as it rotates, forming tightly sealed cavities that move toward the discharge port, transporting the liquid.
The pumped liquid does not change in shape or size when pumped due to the tightly sealed cavities formed between the rotor and stater. The effect of the design is that the fluid is moved at a very steady rate. With positive suction, the pumping action starts the instant the rotor turns, and liquid acts as the lubricant between the pumping elements.
In operation, Continental pumps in GA are fundamentally fixed-flow rate pumps that offer reliable service to transport thick or lumpy fluids. However, abrasive fluids can significantly shorten the life of the stater. Also, scurries can be pumped reliably if the slurry is viscous enough to maintain a lubrication layer around the particles and protect the stater.
At the points where the rotor touches the stater, the surfaces are generally traveling diagonally, so small areas of sliding contact occur. These areas need to be lubricated by the fluid being pumped. This can mean that more torque is required for starting, and if allowed to operate without fluid, rapid deterioration of the stater can happen.
Progressing Cavity Pump Key Advantages:
Positive Displacement: The turning rotor develops “positive pumping action” similar to a piston moving through a cylinder of infinite length. The pump pressure developed does not depend upon the speed of the rotating rotor. The capacity of the pump is approximately viscosity, and pressure can be projected for particular operating conditions.
Uniform Discharge Flow: Fluids are uniformly discharged without pulsation in a constant steady flow. Displacement remains the same with each revolution of the rotor, permitting accurate metering relative to the fluid being pumped. Because of the unique flow characteristics, these Continental pumps in GA are well suited for low-shear applications.
Internal Velocity Of Fluids: All fluids are pumped with a minimum amount of turbulence, agitation, pulsation or separation disturbance.
Self-Priming: Pumping action starts when the rotor is turned, and it is capable of 28 feet of suction lift in an appropriate installation. The liquid being pumped acts as a lubricant between the rotor and stater and forms a continuous seal to project the pumping phenomena.
Solids In Suspension: Solid particles over a wide range of size and shape – as large as 1-1/8 inches in diameter, are pumped with no difficulty.
Reversible: Pumps can be operated clockwise or counter-clockwise with effective performance in most installations.
If you would like more information regarding Continental pumps in GA or are looking for a replacement pump on an existing line you can:
1. Talk to one of our applications engineers about how you might improve the performance of your existing system by calling 404-647-0986 or filling out the Pump Quote Request Form.
2. If you know what you need, and when you need it, call us at 404-647-0986 or email us at [email protected] for fast order processing.