Sanitary Self Priming Liquid Ring Pump

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The SP-LR Sanitary Self Priming Liquid Ring Pump has been produced specifically for hygienic and sanitary applications within the food, chemical and pharmaceutical industries for liquids which contain air or gases. The series is fully compliant with all relevant standards and has been designed with a heavy emphasis on compactness, robustness, cleanability & low maintenance costs. The open impeller, which is dry mounted, ensures optimal cleaning of the shaft and sealing chamber and the applied O-Ring minimises liquid contact whilst ensuring optimal cleaning of the contact faces of the seal.

All pumps within this range are suitable for being CIP cleaned. The range currently consists of 2 pump sizes, with 4 more in development. Capacities available are up to 60 m³/hr & 4 Bar max deliverable pressure with connection sizing ranging from 2” to 2½” in a variety of types. The pump is entirely machined from cast Stainless Steel AISI 316L with a surface roughness of <0.8 as standard (<0.5 on request) to provide increased corrosion resistance.

Upon request, the pumps can also be delivered in Supra SS 316L and Hastelloy C22. Various O-Ring and Mechanical Seal variants can also be applied to ensure that these pumps meet the requirements of almost any application.

As standard, the range is supplied in a close coupled configuration encased in a hygienic shroud with adjustable feet and the impeller is mounted by a balanced stainless steel stub shaft. Upon request they can also be provided in a bearing housing execution for high temperature applications or fitting with hydraulic motors.

Heating jackets & casing drains can also be fitted if required. Motors can be supplied in all efficiency, isolation, protection and voltage classes and they are also available in ATEX compliant executions and fitted with noise reduction measures.

Data & Limits

Max Capacity 60 m³/hr
Max Pressure 4 Bar
Max Viscosity 500 cPs
Max Temperature 140ºC
Max Suction Lift 6-8 m
Connections 2” – 2½”
Connection Types Couplings: DIN11851, DIN11864-1, SMS1145 Flanges: EN1092-1, DIN11864-2, ANSI Tri-Clamps: ISO2852, DIN32676, DIN11864-3 BSP & NPT threaded
Shaft Sealing Single, double quench/flush, Inner and outer, EHEDG. according to DIN24960
Sealing Materials carbonl/CrM, carbon/SiC, SiC/SiC, Tc/Tc
Elastomer Materials EPDM, Viton, NBR, Teflon, KALREZ, e.g. according to FDA
Wetted Parts AISI 316L (AISI 316L Mo+Ni or Hastelloy CX2MW N26022 upon request)
Surface Roughness <0.8 Micron (Std.), <0.5 upon request (Mechanical & Electro-Polished)
Drives Standard: IEC, IE2, B3/B5, IP55, isol cl. F, PTC Optional: IE3, ATEX, noise reduction

Capacity Range

Current pumps available are SP-LR 186 & SP-LR 232. Both can be equipped with single or dual channels in the cover and housing. A Dual channel configuration allows for increased flow and pressure.




Mechanical Seal

All mechanical seals are supplied to EHEDG & FDA-CFR 21 standards as well as being DIN 24960 (apart from build-In length) compliant. They are available in the following material combinations and variants:

  1. - Carbon / Silicon Carbide

  2. - Carbon / CrMo-Steel

  3. - Carbon / Ceramic

  4. - Hard Metal

  5. - Silicon Carbide / Silicon Carbide

  6. - Tungsten Carbide / Tungsten Carbide

  7. - Carbon / Metal

O-Rings are available in:

  1. - Viton

  2. - NBR

  3. - EPDM

  4. - PTFE


  1. - S1 = Internal Single Mechanical Seal – Unbalanced

  2. - S2 = External Single Mechanical Seal – Unbalanced

  3. - B1 = Internal Single Mechanical Seal – Balanced

  4. - Q1 = Double Mechanical Seal with Quench – Unbalanced

  5. - Q12 = Double Mechanical Seal with Quench – 1 Side Balanced, according to EHEDG Standards

Seal Quench is also available upon request. 

mechanical seal variants sp-lr

Balanced Stub Shaft Design

balanced stub shaft design for sp-lr

All SP-LR Sanitary Self-Priming Liquid Ring Pumps are fitted with a balanced stub shaft design with features a conical shaft end without key way and dry mount EHEDG / FDA compliant O-Rings. Grub screw attachment to the motor shaft enables easy assembly and disassembly during maintenance procedures.

Optional Heating Jacket

optional heating jacket for sp-lr

All models can be fitted with an optional heating jacket to maintain fluid temperature whilst being pump and is generally used when transferring for higher viscosity edible oils.

Design Variants

Depending on the area of the application the following, fully interchangeable, design variants are available on request:

sp-lr design variants


  1. CIP Return

  2. Unloading & Loading of tanks where suction lift is required

  3. Transfer of aerated fluids or with high vapour content

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