APV HT 680

APV HT 680 scraped surface heat exchangers are specified for thermal processes where fouling, viscosity, particles or changing product characteristics can reduce the effectiveness of conventional heat exchanger technology. Applications include dairy products, sauces, mayonnaise, soups, fruit preparations, confectionery products, cosmetics and other hygienic processes. Continuous scraper action removes product from the heat-transfer wall and promotes uniform thermal transfer. This makes the series suitable for processes requiring controlled heating or cooling while limiting surface accumulation.

The series can be configured horizontally as HT or vertically as VT according to plant layout and servicing requirements. HT construction uses a rigid stainless-steel frame and can be extended to as many as six cylinders, supporting modular production capacity. The VT arrangement requires less installation space and incorporates a manual pivot-point mechanism for repositioning the cylinder between operating and service positions. Three cylinder lengths—520, 540 and 580—provide heat-transfer areas of 0.2, 0.4 and 0.8 m² per cylinder respectively.

Standard product-wetted parts are constructed from AISI 316L stainless steel and are rated for product pressures up to 20 bar. Duplex SAF 2205 construction increases the available product pressure rating to 25 bar and provides an option for acidic or abrasive products. Product operating temperature is specified from -10°C to +150°C, while heating or cooling media can operate from -20°C to +170°C. Self-loading hinged PEEK scraper blades are standard with the 97 mm rotor, while floating PEEK/PTFE blades and alternative rotor diameters provide further process-specific configuration.

Equipment specification can therefore be matched to product rheology, particle size, pressure drop, heat-transfer requirement and available installation space. The 72 mm rotor provides greater annular clearance for larger particles and lower pressure drop, while the 112 mm option can enhance heat transfer and reduce product holding volume and heat exposure. Single seals can be upgraded to flushable double mechanical seals, and options such as a heatable rotor and clip-on insulation provide additional process flexibility. These configurable elements allow an existing installation or new system to be specified around both current production requirements and anticipated process changes.