APV Pumps (SPX FLOW)
DW+ Series – Piston & Bi-Lobe Rotor Pumps
DW+ Series – Piston & Bi-Lobe Rotor Pumps
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Product Type: Positive Displacement Pumps
Description:
The DW+ Series is a highly adaptable positive displacement pump, engineered for the efficient handling of high-viscosity and shear-sensitive fluids. Its low-shear, pulsation-free operation ensures a smooth and gentle product flow, while also simplifying maintenance. Designed to meet the strict sanitary requirements of the dairy, food, beverage, pharmaceutical, personal care, chemical, and general industrial sectors, it combines hygienic performance with improved operational efficiency.
DW+ Series – Advanced Positive Displacement Pump Technology for Hygienic Applications
Building on the proven legacy of the DW Series, the DW+ Series represents the next evolution in positive displacement pump technology. Designed with a strong focus on the needs of dairy, beverage, food, brewing, confectionery, and pharmaceutical industries, these pumps offer enhanced performance, exceptional reliability, and simplified maintenance – all while ensuring product integrity in the most demanding sanitary processes.
Key Benefits for Hygienic Production
- Gentle Product Handling
The DW+ Series is engineered for high-value, shear-sensitive applications. Its unique rotor designs — particularly the piston rotor — create an extended sealing path that significantly minimizes shear and mechanical stress. This ensures delicate products retain their texture, consistency, and sensory qualities, making it ideal for applications like cream, yogurt, chocolate, syrup, and pharmaceutical emulsions. By protecting viscosity-sensitive ingredients, the DW+ helps reduce product loss and ensures premium quality. - Pulse-Free Operation for System Safety
Thanks to the innovative piston rotor design, the DW+ ensures a smooth, pulse-free flow. This eliminates vibrations, pressure spikes, and noise, which helps protect downstream equipment like filling machines, dosing systems, and heat exchangers. The result is a stable, uninterrupted process and extended equipment life — critical in automated production lines in the beverage and pharma sectors. - Low NPSHr for Demanding Processes
The low Net Positive Suction Head requirement (NPSHr) of DW+ pumps makes them ideal for applications prone to cavitation, such as ultrafiltration in dairy, or transferring thick confectionery masses. The design ensures continuous, cavitation-free operation even in challenging suction conditions. - High Volumetric Efficiency
DW+ pumps deliver excellent volumetric efficiency, even with medium to high-viscosity fluids. Optimized internal clearances (optional “Super Tight” rotors) and high operating speeds allow for a more compact pump selection — reducing both footprint and total cost of ownership. This makes them perfect for sugar solutions, malt extracts, syrups, and pharmaceutical suspensions. - Non-Galling Alloy (NGA) Rotors
Optional non-galling alloy (NGA) rotors allow even tighter internal clearances, minimizing downtime and preventing housing damage under harsh operating conditions. This ensures maximum reliability in continuous production environments such as dairy and beverage processing. - Ultra-Hygienic and CIP-Ready
DW+ pumps are fully CIP/SIP cleanable, featuring a profiled front cover gasket for improved cleanability. Built to withstand aggressive cleaning cycles and rapid temperature shifts, the DW+ Series meets the highest standards of hygiene demanded by the food and pharma industries.
Global Compliance and Recognition
The DW+ Series is globally approved and trusted in hygienic systems across the world. It is:
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3-A certified
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EHEDG compliant
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Integrated into thousands of systems under the SPX FLOW / APV umbrella
With a solid reputation for handling high-viscosity and sensitive products, DW+ pumps are a go-to solution for manufacturers seeking hygienic excellence, reduced maintenance, and consistent product quality.
Theory of Operation – APV DW+ Positive Displacement Pump
The APV DW+ operates on the principle of rotary positive displacement, using either piston or bi-lobe rotors to gently transfer high-viscosity and shear-sensitive liquids. The pump draws fluid into expanding cavities at the inlet side, then displaces it forward as the rotors rotate and intermesh, forcing the liquid out through the discharge. This mechanism ensures a smooth, pulse-free flow, minimizing vibration, pressure surges, and product degradation.
Rotor Options for Application Flexibility
◾ Piston Rotors feature a long sealing path, ideal for maintaining low shear and energy-efficient performance. This design enhances flow control and is particularly beneficial for delicate, high-value products such as dairy creams, pharmaceutical gels, and confectionery fillings.
◾ Bi-Lobe Rotors are available for applications that involve larger particles or suspended solids, offering gentle handling while maintaining efficient transfer — a great solution for sauces, yogurt with fruit, or chemical slurries.
Hygienic Design with Tight Clearances
To support ultra-hygienic processing, the DW+ integrates non-galling alloy rotors, allowing for minimal internal clearances without the risk of rotor-to-housing damage. This not only improves volumetric efficiency but also ensures long-term durability in high-demand applications.
Mechanical Enhancements for Reliability
◾ Helical gears and double-tapered roller bearings are incorporated to reduce operational noise and increase system robustness.
◾ An integrated pressure relief valve protects both the pump and the system from overpressure events.
◾ A thermal jacket option is available to maintain consistent product temperature — ideal for temperature-sensitive media like chocolate or creams.
Engineered for CIP/SIP and Low NPSH Conditions
The DW+ pump is fully compatible with Clean-In-Place (CIP) and Sterilize-In-Place (SIP) protocols, making it suitable for strict hygienic environments such as food, dairy, beverage, and pharmaceutical production. Maintenance is simplified with front-loading mechanical seals, and the pump’s low NPSH requirement helps prevent cavitation, even in challenging suction conditions.
In summary, the DW+ combines precision engineering, hygienic performance, and application versatility — making it a trusted solution for manufacturers seeking gentle handling, reliability, and efficiency across critical processing lines.
