Progressive Cavity Pumps
This pump principle works something like a corkscrew where a helical shaped rotor rotates within a double helix elastomeric stator. The rotor seals tight against the stator helix lip as it rotates forming a string of cavities in between where the fluid is moved in a continuous motion and relatively free from pulsation. This allows for moving abrasive slurries at low volumes to medium & high heads. Also due to its ‘gentle’ type action, adapts well to moving delicate media such as soups & yoghurts and thixotropic materials where shearing is to be avoided.
Can pass solids
Can process air with the liquid
Few moving parts
Low flow rates at Pressures to 24bar
Good for dosing viscous additives
Lower speeds for abrasive liquids
Low service requirement
Readily available spare parts
Limited flow rates
Will not tolerate operator misuse
Expensive to repair
Expensive for materials other than standard irons
Limited fluid temperatures with special modifications required
Significantly larger than comparable options of similar duty
Life dependant on operating speed.
Common brands serviced include;
Mono, Southern Cross, Netzsch, Allweiler PCM, Seepex, Sulzer, Flowrox, Roper, Monoflo, Moyno, Inoxpa, Wangen, Roto, Bornemann and SPX.