Hygienic Displacement Pumps

Several designs have become established among hygienic positive displacement pumps, differing in construction and in the applications they suit. The choice of the right variant depends primarily on viscosity, flow rate and the properties of the medium.

• Rotary Lobe Pumps: Two counter-rotating lobes convey the medium through the pump casing without contact. Suitable for viscous and solids-laden products that need to be handled at pressure while still being treated gently.
• Gear Pumps: Intermeshing gears produce a steady and precise volumetric flow. Suitable for applications with especially high requirements for metering accuracy and long service life.
• Progressive Cavity Pumps: An eccentrically rotating rotor runs inside a stator and delivers virtually pulsation-free flow. Suitable for sensitive, highly viscous media.
• Multi Screw Pumps: Intermeshing screw spindles provide reliable and even delivery, including at high flow rates. Suitable for strongly lubricating or highly viscous liquids in large volumes.
• Peristaltic Pumps: The medium travels solely inside a flexible hose that is compressed from the outside, with no contact with mechanical components. Suitable for shear-sensitive or sterile applications.
• Diaphragm Pumps: An oscillating diaphragm displaces the medium and completely separates the drive section from the product, so no rotating parts come into contact with the medium. Diaphragm pumps are particularly suitable for aggressive or ultra-pure media.
• Plunger Pumps: A plunger with a stationary seal produces a precise, oscillating pumping motion. Plunger pumps are therefore used above all for high-precision metering tasks involving very small volumes, for example in specialised pharmaceutical dosing applications.

Which design is best suited to which application ultimately depends on the specific process conditions. It is therefore always worth comparing the technical requirements with the characteristics of each pump technology before selecting one.

different Types of
Hygienic Displacement Pumps

Compared with other pump technologies, hygienic positive displacement pumps offer several advantages that make them particularly attractive for the food, beverage, cosmetics and pharmaceutical industries.

• Constant, volumetrically accurate delivery: Enables exact metering regardless of pressure fluctuations in the system and makes these pumps the first choice for filling and blending processes.
• Reliable handling of viscous media: Handles highly viscous and solids-laden products that push centrifugal pumps to their limits and does so without any loss of performance.
• Gentle product handling: The low mechanical load preserves the structure and quality of sensitive products during delivery.
• Reduced cleaning effort: CIP- and SIP-capable designs, together with hygienic connections such as Tri-Clamp fittings, allow quick and thorough cleaning without extensive disassembly.
• Certified compliance: Recognised standards such as EHEDG, 3-A Sanitary Standards and FDA conformity build confidence among operators and auditors alike.

Hygienic positive displacement pumps are used in all those industries where product purity, process reliability and gentle handling are equally critical.

• Food industry: For sauces, pastes, chocolate, dough and batters, as well as edible oils and fats, for example in the virtually maintenance-free handling of mayonnaise.
• Dairies: For yoghurt, condensed milk and other sensitive dairy products, where low shear stress protects consistency and quality.
• Beverage industry: For filling and precise metering, and in sparkling wine production, where pressure fluctuations and shear forces have to be avoided in order to prevent unwanted foaming.
• Cosmetics industry: For creams, emulsions and shampoos, with a particular focus on easy cleaning and fast product changeovers between formulations.
• Pharmaceutical production: For active ingredients and cell suspensions, for example in insulin production, where a dead-space-free design and residue-free cleaning in place are essential.

Beyond these core industries, hygienic positive displacement pumps are also found in other production environments where high demands on product protection and hygiene meet the need for precise, gentle handling.