Sanitary Divert Valves & Tube Fittings for High-Viscosity Food Processing: Ketchup, Chocolate Syrup & Salad Dressing Applications(Part 1)

Fluid Transfer Challenges in High‑Viscosity Food Processing
Ketchup, chocolate syrup, and salad dressing represent three typical categories of high‑viscosity food processing. Ketchup typically has a viscosity in the range of several thousand to tens of thousands of centipoise and contains fruit pulp fibres and spice particles; chocolate syrup is a high‑viscosity fluid at room temperature, with viscosity increasing sharply or even solidifying as temperature drops; salad dressing is an oil‑in‑water emulsion system that can break if over‑sheared. These three products impose distinctly different yet equally demanding requirements on divert valves and tube fittings in piping systems.

The core challenges in fluid transfer of high‑viscosity foods include:

Flow resistance and pressure drop are the most direct engineering challenges in high‑viscosity material transfer. The pressure drop generated by high‑viscosity fluids flowing through pipes is far greater than that of low‑viscosity fluids, requiring valves with the lowest possible flow resistance design. Full‑bore ball valves with no flow obstruction become the ideal choice for viscous liquids or liquids containing solid particles. The fully open valve cavity design creates no fluid resistance, making it suitable for handling viscous or particulate‑containing fluids.

Clogging and residue issues are common problems in high‑viscosity material handling. When processing viscous materials or those containing solid particles such as jam, honey, ketchup, or fruit‑pulp beverages, equipment needs low flow resistance, anti‑clogging, easy‑to‑clean characteristics, and minimal shear damage to the material to preserve product texture. In the control of yogurt, jam, or fermentation liquids, the high viscosity and solids content of the medium are the main challenges, requiring valves to have a “dead‑spot‑free” flow channel design to prevent media retention and spoilage within the valve cavity.

Temperature sensitivity and insulation requirements are particularly evident in products such as chocolate syrup. Temperature drops cause viscosity to increase or even solidify, and insulated valves ensure smooth flow in the pipeline, preventing clogging.

Hygiene and cleaning requirements are non‑negotiable in all food applications. Sanitary valves are manufactured from stainless steel 304SS or 316, with electro‑polished smooth surfaces combined with food‑grade sealing materials (such as EPDM), effectively preventing media retention and contamination risks. The valve cavity features a full‑bore design ensuring no flow resistance, making it suitable for handling particulate‑containing or high‑viscosity media.

Divert valves play a critical role in high‑viscosity food processing – they can switch material flow between different processing units (such as mixing tanks, homogenisers, filling heads, and CIP cleaning circuits), enabling continuous production and in‑line cleaning. Sanitary divert valves manufactured by brands such as Dixon, constructed from 316L stainless steel, are suitable for hygienic flow diversion applications in food, dairy, beverage, and pharmaceutical industries.