A multipurpose pump in wine-making

White wine vinification

The Rotho peristaltic pump can transfer whole grape clusters without altering either the grape berries or skins. The "opening/closing" movement of the tube is static, without the grinding effect of other types of pump. The pumped product is therefore not damaged in any way.

It has been shown that 50% of healthy grape berries reach their destination unaltered and that the musts obtained have a polyphenol content 10-15% lower than with traditional systems.

In practice, undamaged grape skins reduce the quantity of lees during static decantation of the must, obtaining a product which is easy to treat during filtration, clarification, etc. and with guaranteed good keeping qualities during the subsequent phases of vinification.

Red wine vinification and remontage

Some of the advantages of the Rotho peristaltic pump during this phase.

  • It ensures complete protection from oxygen, or the gas can be injected in pre-established quantities if required
  • The homogeneity of the mass is guaranteed by the delicacy of the pumping action
  • Reduced risk of attack from enzymes like oxidase and polyphenol oxidase, thanks to a reduced "solvent-emulsifying" action on the oxygen
  • Improved selection of aromatic and colouring components thanks to the delicate treatment of solid parts
  • Comparative tests confirm that the Rotho peristaltic pump limits lees residues to one third of the quantity generated by other pumping and processing systems.

Transferring the pomace

  • The percentage of lees is very low, about one third of the normal, as the skins are not ruptured by the delicate pumping.
  • No physiological alteration of the liquid part
  • No aeration or contamination of the mass
  • The gentle trauma-free transfer of the mass preserves the fragrance of the product and allows more complete and homogeneous colour extraction.
  • The Rotho peristaltic pump can also be used to pump dried grapes without clogging, avoiding the usual problems caused by the lower quantity of liquid present.
  • Ganymede-type fermenters can be emptied without clogging, despite the presence of a large mass of grape pips on the cone-shaped bottom of the fermenter.

Feeding the chillers

The Rotho pump optimises heat exchange, modifying the hourly flow rate according to the required temperature by means of an inverter.

The gentle pumping action prevents emulsifying of the oxygen in the fluid when low temperature causes high solubility, and prevents the extraction of unwanted substances like tannins, astringents, pectin, lignin, etc..

Filling the barrels

Thanks to this characteristic, together with its pumping capacity, the Rotho pump can easily be used to fill and empty barrels with absolute delicacy, avoiding all trauma to the pumped wine or agitation of the sediment in the barrels.

The addition of "barrels filling guns" allows the Rotho peristaltic pump to be exploited to its full potential.

Transferring the product and feeding the bottling plant

The Rotho peristaltic pump is unique in preserving product quality during handling, and can be used all year round for routine product transfers.

In bottling plants, the Rotho peristaltic pump can be used to feed the filler delicately and in proportion to need. Inverter control regulates flow rate according to an analogue signal from the filler without sudden pressure changes, thus avoiding the need for damaging bypasses and product recirculation systems.

Dosing additives and enzymes

The Rotho peristaltic pump can dose enzymes, bentonite, glycerin, gum arabic and sulphur dioxide with an absolute precision of 0.5-1%. It therefore improves performance in handling various products, guaranteeing improved operation, a longer working life and higher abrasion resistance than other types of pump.

Dosing sulphur dioxide in aqueous solution

The Rotho peristaltic pump can dose sulphur dioxide in aqueous solution with an absolute precision of 0.5 to 1%, while guaranteeing total chemical resistance to the pumped product. If pumping stops, there is no need for a return valve thanks to the total seal of the propelling roller on the tube.