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APV Wi+

The ITT Flow Technologies Wi+ Series is a range of inducer centrifugal pumps for process applications where available NPSH is limited. An axial-flow inducer boosts inlet pressure before the main impeller, typically reducing NPSH required by 50–70% and helping control cavitation, product damage and premature pump wear. The series is an OEM pump offering from ITT Flow Technologies for sanitary and industrial process duties.

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Key specifications

  • Flows Up To 400 m³/h
  • Pressure Up To 15 bar

Product features

  • Reduced NPSH requirement: The inducer typically lowers NPSH required by 50–70%, supporting reliable pumping where suction head is restricted.
  • Cavitation control: Increased inlet pressure reduces cavitation risk and associated noise, energy loss, product damage and unnecessary component wear.
  • Broader product handling: The inducer enables operation with viscous or gaseous products beyond the practical range of conventional centrifugal pumps.
  • 316L stainless steel construction: Casing, front cover, impeller, back plate, shaft, air screw and recirculation pipe are specified in SS 316L, with SS 304 used for clamp rings, adaptor and support.
  • Configurable sealing: Standard Carbon/Silicon Carbide shaft seals can be specified with an optional Silicon Carbide/Silicon Carbide arrangement; FKM elastomers are standard and EPDM is available.
  • Process compatibility: Applications include dairy, bakery and confectionery, pharmaceutical/cosmetics, and chemical/industrial processes, covering products from milk and syrups to emulsions, detergents and chemical solutions.
  • Connection and motor flexibility: Standard S-Line connections can be supplemented by bevel seat, I-line, ISO and other fittings, while multiple motor enclosure and electrical configurations are available.
  • Sanitary capability: Optional 3-A certification supports specification of Wi+ pumps for sanitary processing environments where appropriate.

Product description

The Wi+ Series is specified for process systems where insufficient suction head makes conventional centrifugal pumping vulnerable to cavitation. Typical duties include low-boiling-point products, vacuum processes and applications involving viscous media or entrained gas. The inducer acts ahead of the main impeller to increase inlet pressure and maintain a low NPSH requirement across the operating range. This allows process engineers to address difficult inlet conditions without necessarily changing the upstream process arrangement.

Operationally, reducing cavitation helps protect both the transferred product and the pump. Excessive noise, energy losses, product degradation and unnecessary mechanical wear are among the disturbances associated with cavitating operation. By reducing NPSH required, the Wi+ Series supports more stable transfer under challenging suction conditions. Available applications span food, dairy, pharmaceutical, cosmetic, chemical and general industrial processing.

Product-contact pump components are constructed extensively from SS 316L, including the casing, front cover, impeller, back plate and shaft. Standard shaft sealing uses Carbon/Silicon Carbide faces, with Silicon Carbide/Silicon Carbide available where process requirements justify an alternative specification. Standard FKM or optional EPDM elastomers provide further configuration flexibility. S-Line connections are standard, with additional connection standards available to suit plant piping requirements.

Wi+ pumps are available across multiple sizes and can be specified around required flow, head, pressure, connection and motor conditions. The wider modular W+ platform supports capacities up to 2,300 GPM (522 m³/h) and pressure configurations up to 360 psi (25 bar), although actual limits depend on the selected model and configuration. Correct selection therefore requires verification against the required duty point, NPSH available, product properties and operating conditions. ITT Flow Technologies also provides its PUMP-FLO Connect selection system for sizing APV centrifugal pumps.


Performance

Max. capacity
400 m³/h
Max. diff. press.
15 bar
Max. temperature
95 °C
Max. viscosity
800
Max. head
75 m

Certificates

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A-3

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ATEX

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CE Marking

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EHEDG

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FDA

Wi+ Series pumps are used where available NPSH is limited or process conditions make conventional centrifugal pumping difficult. Listed applications include bakery and confectionery, dairy, pharmaceutical and cosmetic production, and chemical or industrial processing, including duties involving viscous products, gases, low-boiling-point liquids and vacuum processes.
The casing, front cover, impeller, air screw, recirculation pipe, back plate and shaft are specified in SS 316L. Clamp rings, the adaptor and support are SS 304. Standard sealing combines Carbon and Silicon Carbide, while FKM is the standard elastomer and EPDM is available as an option.
The axial-flow inducer increases pressure at the pump inlet before the product reaches the main impeller. ITT Flow Technologies states that this typically reduces NPSH required by 50–70%, decreasing cavitation risk and therefore helping limit excessive noise, energy loss, product damage and unnecessary pump wear.
Compatibility should be verified against the required flow, head, available NPSH, product characteristics, pressure, temperature, connection standard, seal and elastomer requirements. S-Line connections are standard, while bevel seat, I-line, ISO and other standard fittings are available. Pump sizing should be confirmed for the individual duty rather than selected solely by nominal series capability.
Maintenance and replacement planning should account for the exact Wi+ model, hydraulic duty, inducer configuration, shaft seal materials, elastomers, connections and motor specification. Where an existing pump is being replaced, verifying these parameters alongside the system's NPSH available helps preserve the intended cavitation margin and process performance rather than relying only on dimensional fit.
Eoin Cahill
Water & Wastewater, Power generation, Construction & Mining
Brian Coleman
Food & Beverage Sectors.
Brajan Saraci
Pharmaceutical, BioPharma, Chemical and Petrochemical Sectors