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Alfa Laval SX Rotary Lobe Pump

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The Optimum Choice for Ultra-Clean Processes

SX Rotary Lobe Pump

The SX range of rotary lobe pumps has been designed for use on wideranging applications within the Pharmaceutical, Biotechnology, Fine Chemical and Speciality Food industries. Being certified by EHEDG (European Hygienic Equipment Design Group) as fully CIP cleanable to their protocol, the SX range is ideally suited to applications where cleanability and corrosion resistance is paramount.
In addition the SX pump range also conforms to USA 3-A Sanitary Standard and all media contacting components are FDA compliant.
The SX pump operates with a high efficiency, low shear pumping action for assured gentle handling of delicate and sensitive media.
The SX pump range is also classified for use in potentially explosive atmospheres under the ATEX Directive 94/9/EC Group II, Categories 2 & 3, with temperature classification T1 to T4.
The SX range is compact in size, capable of flow rates up to 115 m/h and pressures up to 15 bar.
Standard Design

Pump Gearbox
The SX pump with its conventional lobe pump design concept has a robust cast iron gearbox, which provides maximum shaft rigidity and easy oil seal replacement. The SX range in series 1 - 4 has a universal gearbox design. This gives the flexibility of mounting pumps with the inlet and outlet ports in either a vertical or horizontal plane, by changing the foot and its position.
The SX range in series 5 & 6 has dedicated gearbox castings, which also allows the inlet and outlet ports to be in either the vertical or horizontal plane. The SX series 7 has a dedicated gearbox casting allowing inlet and outlet ports in a vertical plane only.
Pump head Construction
The SX pump has sanitary design full bore inlet and outlet ports to International Standards, maximising inlet and outlet port efficiency and NPSH characteristics. Vertical porting and unique rotorcase internal profile enhances self-draining and self venting whilst maintaining optimum volumetric efficiency.
The SX pump has four lobe rotors, designed using CFD (Computational Fluid Dynamics) to develop the optimum rotor geometry - possibly the first rotary lobe pump to be developed using this technology. All rotors are rated to 150C facilitating use with CIP/SIP processes.
Materials of Construction
Pump gearbox - high quality grey cast iron.
Pumphead - product wetted components in 316L.
Product wetted elastomers of EPDM, MVQ, FPM all FDA conforming.
All media contacting elastomers are controlled compression joints, the latest technology where static and dynamic elastomer seals are used to prevent pumped media leaking to atmosphere.
All product wetted rubberparts are in compliance with FDA section 21 CFR 177.2600 & section 21 CFR 177.1550 (PTFE). EPDM Elastomers are furthermore in compliance with USP Class VI section 88 biological reactivity test, in Vivo.
1. Front cover compression joint
2. Spline sealing cup seal
3. Cup seal
4. Squad ring
Shaft Seal Options
- Single or single flush/quench (steam barrier for aseptic application) R00 type mechanical seals.
- Double R00 type mechanical seal for flush.
All sealing options are fully front loading and fully interchangeable without the need for additional housings or pump component changes.
Specialised seal setting of the mechanical seal is not required as the seal is dimensionally set on assembly. This feature further enhances fast and efficient on-site seal interchangeability.
Materials for Mechanical Seals
Carbon/Stainless Steel, Silicon Carbide/Silicon Carbide or variations of these materials to suit fluid being pumped and/or application requirements. The seal seat and face material combinations are all EHEDG compliant.
Pump Sizing
In order to correctly size a rotary lobe pump some essential information is required. Provision of this information listed below enables our Technical Support personnel to obtain the optimum pump selection.
Product/Fluid Data
- Fluidtobepumped
- Viscosity
- SG/Density
- Pumping temperature, minimum, normal and maximum
- Cleaning in Place temperature(s), minimum, normal and maximum
Performance Data
- Flow rate, minimum, normal and maximum
- Discharge head/pressure (closest to pump outlet)
- Suction condition
Standard Specification Options
- Screwed male inlet and outlet ports to DIN11851, SMS, ISS/IDF, RJT or Tri-clamp.
- Heating/Cooling Jacket for Rotorcase Cover.
- Electropolished product wetted components.
- Full material traceability on request to EN 10204.3.1.
- Electroless nickel plated gearbox.
- ATEX compliance.
- Complete pump unit comprising: Pump + Baseplate (mild or stainless steel) + coupling with guard + Geared electric motor suitable for (or supplied with) frequency speed control or manual variable speed drive (advise motor enclosure and electrical supply).
Working Principle
The positive displacement of the SX pump is provided by non-contacting, contra rotating four lobe rotors within a fully swept pump chamber.
All SX pumps are capable of bi-rotational flow without modification.
Bareshaft Pump Dimensions
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