Lobe pumps

Lobe pumps

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LPX series pumps are hygienic rotary lobe pumps characterized by low shear forces and gentle pumping of both high and low viscosity products. The pumps in this series provide reliable performance with low noise, robust and gentle fluid transfer by using vast cavities that can accommodate large solids. These pumps are optimized for energy-efficient operation.

The design of the LPX series pumps features a special rotor-shaft mounting, ensuring accurate rotor positioning and a backlash-free connection. The unique gear housing design ensures no cross-contamination of the pumped product with gear oils. The pre-loaded tapered roller bearings do not require shims. As an option, they can be equipped with double mechanical seals for dry running. LPX series pumps provide good access to parts with easy maintenance and installation.

Tapflo Lobe pumps have a hygienic design confirmed by 3A certification and can be cleaned and sterilized on site (CIP/SIP).

LPX series pumps are hygienic rotary lobe pumps characterized by low shear forces and gentle pumping of both high and low viscosity products. The pumps in this series provide reliable performance with low noise, robust and gentle fluid transfer by using vast cavities that can accommodate large solids. These pumps are optimized for energy-efficient operation.

The design of the LPX series pumps features a special rotor-shaft mounting, ensuring accurate rotor positioning and a backlash-free connection. The unique gear housing design ensures no cross-contamination of the pumped product with gear oils. The pre-loaded tapered roller bearings do not require shims. As an option, they can be equipped with double mechanical seals for dry running. LPX series pumps provide good access to parts with easy maintenance and installation.

Tapflo Lobe pumps have a hygienic design confirmed by 3A certification and can be cleaned and sterilized on site (CIP/SIP).

Technical data
Capacity: Qmax. = 1371 l/min
Qmax. = 2,29 l/rev
Max. speed 1200 rpm
Max. operating pressure: PN10
Max. particle size: 3-15 mm
particle sizes depend on the pump model
Temperature: 100 °C
Rotor type: lobe, made of AISI 316L
Casing and cover material: 316L stainless steel
Mechanical seal material: SiC/SiC
Typical applications
Industry Example of application
Bakery products Cakes, flavors, frostings, fruit fillings, fats and oils, sweeteners, yeast starters.
Beverage production Beer, wort, yeast, soft drinks, fruit concentrates, fruit drinks.
Canned goods Baby food, soups, stews, tomato or fruit puree, vegetables, diced vegetables, baby paps, puddings, jams, jellies, salad dressings, mayonnaise.
Confectionery products Syrups, cream fillings, chocolate.
Cosmetics Face creams and lotions, hair styling gels and fluids, essential oils, dyes and alcohols.
Dairy Cream, milk, curd and whey, yogurts.
Meat production Meat emulsions, ground meats, pet foods, animal fats.
Pharmaceutical industry Pills masses, syrups, extracts, emulsions, suspensions.
Chemical and general industry Solvents, fuels, oils and greases, paints, resins and polymers, soaps, sediments.
Working principle

The working principle of a lobe pump is to displace a certain amount of liquid from the suction area, by rotating the working elements (lobes), to the discharge area. The lobes are mounted on shafts, which are seated on bearings in an external synchronizer. Shafts equipped with gears, located inside the synchronizer, transfer the drive from the drive shaft to the intermediate shaft. The lobes are synchronized in such a way that they do not contact each other during operation.

As the lobes rotate, they increase the volume of the space between the teeth, causing a pressure drop on the suction port side (fig. 1). This causes fluid to flow into the pump body. The pumped liquid is transported inside the casing (fig. 2 and fig. 3) to the discharge side of the pump (Fig. 4). When the volume of the space between the lobes decreases, it causes an increase in pressure on the discharge side, and consequently the liquid is pushed out of the pump body.

Lobe pumps. Working principle

Design

Lobe pumps. Design

1. Unique mounting system
  • accurate rotor positioning,
  • facilitated maintenance.
2. Rotor
  • rotor mounting tightly isolated from the medium,
  • lobes made of 316L stainless steel.
3. Optimised body design
  • flat cover for easy cleaning,
  • sight glass for quick oil level reading.
4. Mounting feet
  • vertical and horizontal mounting options.
5. Gears
  • helical gears ensure smooth power transmission.
6. Bearings
  • heavy-duty tapered roller bearings,
  • pre-loaded, no shimming required.
7. Simplified adjustment and synchronization
  • easy access to rotor clearance adjustment shims,
  • easy to set and maintain rotor synchronization.
Types of seals
Single mechanical seal

single mechanical seal

Mechanical seal faces provide long service life and high resistance to abrasive media. Available in FDA-approved SiC/SiC as standard.
Double concetric mechanical seal

double mechanical seal

Used with flushing fluid to cool, lubricate and flush out residue. Excellent for demanding applications. Available in FDA-approved SiC/SiC as standard.
Choice of elastomers for O-rings
  • Viton (FDA-certified),
  • optional: EPDM.
Accessories
accessories 3 accessories 4
Vertical execution for pump drainability and easier flow into the suction connection. AISI 304L stainless steel baseplates as standard for all pump sizes
accessories 5 accessories 2
Lubrication tank for media crystallizing in contact with air. Tank using thermosyphon effect for heavy-duty applications.
accessories 1 accessories 6
Mobile solutions individually tailored to the special needs of the client. Standard Tapflo trolleys with fast delivery times and IP66 inverters.
accessories 7 accessories 8
IP66 inverters available in stock with fast delivery times. Covers with heating jackets.
Spare parts kits

It is possible to order service kits tailored to the LPX series, allowing quick replacement of components requiring routine maintenance:

Pumped product sealing kit
(standard and silicon carbide)
spare kit 1
Double seal kit
spare kit 2
Rotor replacement kit
spare kit 3
O-ring kits
(FKM or EPDM)
spare kit 4
  • Technical data

  • Typical applications

  • Working principle

  • Design

  • Types of seals

  • Accessories

  • Spare parts kits

Capacity: Qmax. = 1371 l/min
Qmax. = 2,29 l/rev
Max. speed 1200 rpm
Max. operating pressure: PN10
Max. particle size: 3-15 mm
particle sizes depend on the pump model
Temperature: 100 °C
Rotor type: lobe, made of AISI 316L
Casing and cover material: 316L stainless steel
Mechanical seal material: SiC/SiC

Performance curves