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Our external FlowFriend Pond Pumps are ideal for providing recirculating water in recreational ponds that require an external style of pump. The high flow rates and energy efficiency of the FlowFriend pumps make them perfect for supplying water to waterfalls, wetland filters and water jets. The pump is not self-priming and may not therefore be used above the water surface.
The FlowFriend Series:
The motor speed (600-2,550 rpm) can be adjusted as standard with every type of FlowFriend. The pump includes a display for this purpose that also shows power consumption and hours of operation. Every FlowFriend can also be controlled externally via an optional 0-10V port. The major benefit of permanent magnet motors compared to frequency controlled asynchronous motors is the remarkably high efficiency at low rpm. However, even at higher rpm, these pumps are significantly more efficient.
Ingenious pump housings
A pump’s hydraulics consist of the pump’s rotor and the pump’s housing. The FlowFriend’s hydraulics are entirely made of cast 316 stainless steel. Robust, smooth and a perfect shape to keep internal losses to a minimum.
The FlowFriend Standard
The standard FlowFriend has a mixed- ow pump housing, a type that is also often used at pumping stations. Its optimal field of application is for a pump lift of between 1 and 5 metres. The hydraulics have been designed such that greater pressure is available than with an axial (propeller) pump. As a result, significantly less energy is used in comparison to pumps of similar capacity. Almost all pumps with high capacity have more than 10 metres of pressure. This high available pressure uses a great deal of energy. If there is higher back pressure to any extent, resulting for example from longer hose lengths, numerous bends and difference in height, then this ‘standard’ FlowFriend is the optimal choice. The FlowFriend has a 3” screw thread connection at both the suction and the pressure sides.
Motor and seal
The FlowFriend has a very high-quality Eagle Burgmann shaft seal. The motor has been designed in-house and is manufactured by one of Germany’s largest and most important producers of electrical motors. The motor’s efficiency, depending on the RPMs, is between 88 and 94%.
Dry-running or submersible pumps
The FlowFriend is a dry-running pump with a sealed shaft. This technology is superior from an energy and safety perspective to submersible pumps (in which the pump’s shaft rotates in water). This is why almost all pumps used for industrial applications are pumps with a sealed shaft. As with dry running pumps, the shaft and the stator are positioned extremely close to each other, they have significantly lower energy loss in operation by comparison with submersible pumps. Submersible pumps always require a compromise. If the distance between the stator and the shaft is very small, there is a high risk of damage due to dirt that is stuck between the shaft and the stator. However, as this distance increases, the pump’s energy losses increase quadratically.
If the stator in a submersible pump becomes damaged, direct contact between the core (with voltages exceeding 300V) and the water is possible. This is why a submersible pump is not recommended for applications in which people touch the water or swim in it.