APV DW Series Rotary food pump

A range of 31 models of rotary vane volumetric pumps of the DW series for ultra-hygienic applications. All elements which contact with liquid are made of AISI 316L stainless steel, and the elastomers comply with FDA requirements.

Brief specifications

Gearbox size: DW1 to DW7
Rotor type: piston and bi-lobe
Maximum speed: 600 to 1400 rpm
Maximum flow: 3 to 1016 liters per 100 rpm
Maximum overpressure: 7 to 30 bar

The lineup: DW1/003/7.5, DW1/004/15, DW1/007/7, DW1/007/15, DW2/006/10, DW2/007/20, DW2/013/10, DW2/013/15, DW3/014/10, DW3/017/20, DW3/030/10, DW3/030/15, DW3/050/5, DW4/033/10, DW4/0039/20, DW4/073/10, DW4/073/15, DW4/125/5, DW4/125/7, DW5/080/12.5, DW5/093/25, DW5/142/15, DW5/256/7, DW6/172/12.5, DW6/198/30, DW6/308/15, DW6/519/7, DW7/370/10, DW7/420/30, DW7/725/15, DW7/1016/7

Rotary piston pump structure

DW pumps are positive-displacement, low-slip, stainless steel pumps designed with larger diameter shafts for greater strength and stiffness, mounted on a heavy-duty cast iron bearing frame (stainless steel option available) with double-tapered roller bearings.

Rotary Pump Schematic

Profiled front cover gasket
Front cover
Bearing, front
Bearing, rear
Shaft, main
Shaft, auxiliary
Gears
Clamp ring
Feet
Rotor case
Rotor nut
Rotor

Expanding cavities are formed at the inlet drawing the liquid into the rotors. Meshing of the rotors forces the fluid out of the pumping chamber.

Fluid distribution in the rotors

Applicable for food products and viscous liquids

Fruit and vegetable juices
Cider, wine
Butter, cottage cheese, yogurt
Toothpaste, shampoos, cosmetics

Rotor types

There are two rotor types (piston and bi-lobe) available. The piston rotors can be easily changed to bi-lobe rotors without changing the rotor case. The porting on the pump can also be changed from horizontal to vertical (and vice versa) without any modification to the pump or use of a special gear case assembly.

Cam rotor

Double lobe rotor

Low internal cavitation.
High operating pressure.
Inexpensive price.

Double blade piston

Ripple-free flow due to the patented design.
Minimal damage to the product with soft particles (e.g. vegetables).
The operating time of the rotor is not limited.

Available options

Standard

Surface treatment Ra 0.8 µ / 32 µ.
Single mechanical shaft seal – SiC/graphite.
EPDM O-rings.
Fittings for spline connection in sanitary design.
Multi-functional rotors made of 316L stainless steel.

On order

NGA Rotors. Relief valve
Polished up to Ra 0,5 µ / 20 µ.
Single and double smooth mechanical seal.
Triple edge seal PTFE (confectionery industry).
Gland with seal, sealing thread with PTFE impregnation.
Sealing rings made of fluoride rubber (FPM) or Isolast.
Heat shield on the pump housing and front panel.

Advantages of the APV DW series rotary pumps

High Volumetric Efficiency
Designed according to the principle: "More pump for your money". Internal clearances have been minimized so that a smaller pump size can be selected for medium viscosity applications. This reduces both the initial investment and running costs.
Ultra-Hygienic
The pumps are designed to withstand rapid temperature changes and can therefore accommodate very harsh CIP/SIP cycles. The pumps comply with EHEDG and 3A international hygiene standards.
Pulse-Free Performance
When pumping highly viscous products pumps run completely pulse-free. This ensures a constant flow process without pressure surges.
Low NPSH-Requirement
The highly improved suction capability of the DW pump considerably reduces the NPSH-requirement. This in combination with the absence of pressure pulsations makes the DW pumps ideal for many applications, such as ultra filtration.
Gentle Product Handling
The rotor designs available ensure maximum product integrity and minimize risk of potential damage to sensitive products. Both piston and bi-lobe rotors are suitable for high and low viscosity. They will also handle cheese curds and whey, soft fruit and meat — which previously involved fitting special rotors.
Easy Maintenance
The easy-to-access front loaded mechanical seals reduce maintenance time considerably. All shaft seal O-rings are identical, and access to the shaft seal is achieved by simply removing the front cover and the rotors. Likewise, the timing of rotors is an equally uncomplicated operation.
Low Noise Levels
The patented rotor design practically eliminates hydraulic noise and the helical gears minimize gearbox noise.

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