Stirring Shafts for Overhead Stirrers by VELP Scientifica

Category Stirrer Accessories
Manufacturer VELP Scientifica
Description Code No 

Blades # 

Blades 
Ø mm 
Shaft 
Ø mm 
Length of 
Shaft mm 
Speed
Range
Viscosity
Range
Stirring shaft with floating blades, stainless steel A00001304 2 93 7 400 M-H VL-L
Stirring shaft with folding blade, stainless steel A00001305 1 60 7 400 M-H VL-L
Stirring shaft with fixed blade, stainless steel A00001306 1 50 7 400 M-H VL-L-M
Stirring shaft with propeller, stainless steel A00001307 3 60 7 400 M-H VL-L-M
Stirring shaft with paddle,six holes, stainless steel A00001308 1 69 7 450 L-M L-M
Stirring shaft with turbine, stainless steel A00001309 10 49 7 450 M-H M-H
Stirring shaft with turbo propeller, stainless steel A00001310 3 46 7 450 M-H M-H
Stirring shaft with anchor, stainless steel A00001311 2 45 8 450 L-M M-H

Choosing the correct shaft: Stirring shafts must be chosen bearing in mind the stirrer power, the volume of substances to be stirred and its viscosity. The technical features and the application fields of the stirring shafts are summarized in the following tables:

Speed Range rpm    Viscosity Range mPA*s    Viscosity mPa*s Substance
Low (L) < 250   Very low (VL) 0-100   1 Water
Medium (M) 250-800   Low (L) 100-1,000   5 Milk
High (H) > 800   Medium (M) 1,000-10,000   10 Kerosene
         High (H) 10,000-100,000   100 Lubricating oil
               1,000 Caster oil, Gilcerine
               7,000 Refined Honey
               25,000 Chocolate syrup
               50,000 Ketchup
               100,000 Molasses


Stirring shaft with floating blades: The two blades that open as the speed rises generate an axial flow in the container, from the top towards the bottom. Particularly recommended for stirring in narrow-neck containers, e.g. flasks.

Stirring shaft with folding blade: The blade that automatically falls into line during rotation generates an axial flow in the container, from the top towards the bottom. Particularly recommended for stirring in narrow-neck containers.

Stirring shaft with fixed blade: It generates an axial flow in the container, from the top towards the bottom. Employment: Use at medium-high speed for whirling light solids, for flocculations, mixing thickening agents, stirring sludge, etc.

Stirring shaft with propeller: Standard stirring shaft. It generates an axial flow in the container with suction of the substance from the bottom towards the top and localized occurence of shearing forces.

Stirring shaft with 6-hole paddle: It generates a tangential flow with reduced turbulence and with gentle mixing of the product.

Stirring shaft with turbine blade: It generates a radial flow with suction of the  product from the top towards the bottom, with high turbulence and high
shearing forces.

Stirring shaft with turbo propeller: It generates an axial flow in the container with suction of the substance from the top towards the bottom with low shearing forces. Limited danger of any contact of the blade with the walls of the product’s container.

Stirring shaft with anchor: It generates a tangential flow with high shearing forces on the ends. The flow generated limits the possibility of sedimentation on the walls of the container.

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