Dry-running, self-priming, universally used pumps for a variety of fluids
Looking for a pump that is especially easy to maintain and inexpensive to run? A flexible impeller pump may be just what you need. Using a rotary flexible impeller, the pumps are capable of transferring smooth liquids, liquids with small solids and they can also convey high viscosity fluids.
The flexible impellers in impeller pumps are available in different flexible materials to meet the requirements of many different fluids. The impellers are off-centre inside the elliptical pump housing and as it rotates, the impeller blades flex to create a vacuum which sucks in the liquid to prime the pump. Flexible impeller pumps are self-lubricating so a minimal short dry run is possible. If the pump has already been use and fluid remains inside the pump head, a longer dry-run is possible, but not recommended.
Flexible impeller pumps are available in several sizes with various drive options and are commonly constructed from stainless-steel, aluminium or plastic. Impellers are available in various materials including NBR, EPDM, CR, FKM, FPM and TPU.
Powering an impeller pump can be facilitated with different drives: electric motors, air motors, belt drive, hydraulic motors and even with a power drill or a cordless drill with an adaptor.
HOW DOES A FLEXIBLE IMPELLER PUMP WORK?
A flexible impeller rotates within an eccentrically formed pump housing to create a vacuum and thus suction as the flexing of the impeller blades draws the fluid into the pump head. The fluid medium acts as a lubricant between the blades and the casing and therefore minimises friction and allows smooth transfer of the fluid. In order to avoid the possibility of damage to the pump caused by excessive dry-running, it is possible (and recommended) to install dry-run protection to each flexible impeller pump.
On the suction side of the pump, the vanes or blades of the impeller begin to straighten. The chambers between each vane enlarges and creates a vacuum which pulls the fluid into the pump.
As the impeller rotates, the fluid is positively displaced from the inlet to the outlet. Small solids & particulates are also able to be pumped freely through the pump impeller chambers.
On the discharge pressure side of the pump, the vanes of the impeller begin to flex and cause the chambers to shrink, therefore forcing the fluid out of the pump in a constant flow.