Continental Progressing Cavity Pumps in GA: How They WorkJuly 18, 2019
Continental progressing cavity pumps in GA have characteristics similar to those of a piston pump. These include sealed cavities and operational likenesses such as the ability to pump at exceptionally low rates – even to high pressures – and revealing the result to be purely positive displacement. These pumps are also referred to as eccentric screw pumps due to the motion of their rotor.
The rotors are comprised of stainless or hardened steel and are covered with a chrome plating to offer resistance to abrasive and corrosive materials. Some liquids can have a negative effect on the chrome plating, and in those cases, a non-plated rotor should be utilized.
Stators are metal tubes that have molded cavities of synthetic or natural rubber. The rotor seals itself firmly against the bendable rubber stator as it rotates, and forms firmly sealed cavities that move to the discharge port while transporting the liquid. When pumped, the liquid does not change in size or shape due to the tightly-sealed cavities that form between the stator and the rotor.
With its design, the fluid moves at a very steady and predictable rate. And with positive suction, the pumping action begins the instant the rotor begins to turn, and liquid serves as the lubricant between the various pumping elements. In operation, Continental progressive cavity pumps in GA are basically fixed flow rate pumps that offer long life and reliable service when transporting lumpy or thick fluids.
However, grainy fluids can shorten the life of the stator significantly. Also, slurries can be pumped consistently if it is thick enough to maintain a lubrication layer to protect the stator.
Where the rotor and the stator touch, the surfaces are usually traveling diagonally, so small areas of sliding contact occur, which need to be greased by the fluid. This can mean that more torque is needed for starting.
Key Advantages of Continental Progressing Cavity Pumps in GA
Uniform Discharge Flow: Fluids are equally discharged without pulsation in a steady flow. Displacement stays the same with each revolution of the rotor, allowing accurate predictable metering that is relative to the fluid being pumped. And because of the distinctive flow characteristics, these pumps are well-suited for low-shear applications.
Positive Displacement: When the rotor turns, it creates a “positive pumping action” that is comparable to a piston moving through a cylinder of undetermined distance. The pump pressure that is developed is not dependent on the speed of the rotating rotor. The capacity of the pump is approximately thickness, and pressure can be estimated for certain operating conditions.
Solids In Suspension: Solid elements that cover a wide range of shape and size – as large as 1-1/8 inches in diameter, can be pumped with no trouble.
Reversible: Continental progressive cavity pumps in GA can be operated in either direction with efficient performance in most systems.
If you are interested in learning more about Continental progressive cavity pumps in GA, call today to speak with one of our experts. Keep in mind that we also offer engineering services, repairs, and parts.