Liquid Ring Pump

• Where self priming is required, frothy products or intermittent flows are encountered, a liquid ring pump is the best choice.
• Maximum flow capacity 50m3/hr.
• Once the chamber has an initial charge of liquid, the liquid ring pump
  will always lift (up to five metres negative head) even with an empty suction line.

Uses

• Liquid ring pumps can handle a similar range of liquids to centrifugal
  pumps.
• CIP return applications are a good example where a thorough drain of the
  plant is required.
• Product discharge from evaporators where vapour locks are common under high vacuum and can stall centrifugal pumps.
• Milk collection pump where a self priming pump is needed.

Features

• Elimination of the "shroud" ring around the blades, typically used on traditional pumps and the unique forward curving blades improve efficiency.
• Internal streamlining around the inlet and outlet ports eliminates cavitation sources, reducing generic liquid ring noise. Inlet and discharge ports have unique shapes developed from extensive testing to reduce internal resistance and maximize flow.
• Cast from 316L stainless steel by the high accuracy investment casting process, and machined and polished to a high finish to meet all hygiene standards.  The transition housing connecting the pump head to the motor is also cast in 316L stainless steel.. more about stainless steel casting ...
• The unique Nuphlo impeller mounting features of the centrifugal range is also used on the liquid ring pump, making this a very hygienic and simple pump to dismantle in less than five minutes.
• The unique design has eliminated the troublesome stub shaft used on traditional pumps and the impeller mounts directly on the motor shaft.
• The dynamically balanced impeller ensures vibration is virtually eliminated and a smooth running pump results.  This and the above ensure a long operating life for the mechanical seal and motor bearings.
• CIP capable to 90°C.
• Only two basic tools necessary to strip and rebuild the pump, an operation accomplished in less than five minutes.
• Common components with the other pumps in the Nuphlo range, i.e. seals, and 'O' rings, available worldwide.. more...
• When tightened up, the seals automatically preset and no further adjustment is required.  The mechanical seal housing is an integral part of the back-plate and has no joints.
• Inlet and outlet fittings are integral with the casting, not welded-on (future corrosion sites) and the type of fitting, i.e. RJT, DIN, Tri-clamp, is arranged to suit customer requirements.
• Clamp ring allows the discharge to be set in multiple positions.
• Double flushed seals and heated/cooled back plates are options available.. more...
• Optional stainless steel motor shroud slots into a groove in the transition housing giving instant access to the motor (no bolts).
• Free-standing pumps are fitted with four height-adjustable feet.  These are made from strong nylon with rubber pads to distribute the weight and ensure epoxy coated or tile floors are not damaged.

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Description

The liquid ring pump works on a similar principle to the centrifugal pump where the radial blades throw the liquid outwards converting rotational energy into pressure energy in the process. Unlike the centrifugal pump, the liquid is not directed into a scroll case but into side channels either side of the impeller, in the front housing and the back-plate of the pump. The side channels increase in volume as the impeller passes the suction port (drawing liquid in) and decrease in volume at the delivery port (flowing liquid out).  A proportion of the liquid re-circulates forming the so called "liquid ring".  The pumping action is generated as this liquid ring moves in and out of the side channels.

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