Centrifugal Pumps Varisco

Varisco has become a household name around the world for reliable pumps for difficult applications. Born as a family company, it is now part of an international group fully committed to growth in niche markets. Continual investments in latest generation machine tools make the factory at Padova one of the best in its field. Varisco specialises in self-priming centrifugal pumps for liquids with solids in suspension from 1½” to 12”, and positive displacement pumps for liquids of all viscosities from ½” to 10”. The production range also includes automatic firefighting units according to EN 12845 standard, EN 733 normalized centrifugal pumps, vertical multistage centrifugal pumps and submersible pumps for drainage and dredging. Self-priming principle The air is drawn into the pump due to the negative pressure reated by the moving impeller and is emulsified with the liquid contained in the pump body. The air-liquid emulsion is forced into the priming chamber where the lighter air is separated and leaves through the discharge pipe; the heavier liquid drops back down into circulation. Once all of the air has been expelled from the suction pipe, the pump is primed and works like a normal centrifugal pump. The pump can also work with an air-liquid mixture. The non-return valve has a dual function: it prevents the suction pipe from emptying when the pump is off; in the event of accidental emptying of the suction pipe, this holds a sufficient amount of liquid in the pump body to prime the pump. The discharge pipe must be free to expel the air coming from the suction pipe.