The Unique double-seat mixproof design makes it easy to stream two different products or fluids of virtually any kind through the same valve at the same time, without any risk of cross-contamination.     This means one single Unique mixproof valve can often easily do the job of two or three conventional single-seat valves, saving on both space and installation costs as well as providing unmatched system flexibility. There are absolutely no leaks or spillage when these valves are in operation, making them ideal for use when hygiene requirements are particularly stringent. Unique mixproof valves are easy to install and only require the bare minimum of service and maintenance. Unique mixproof valves feature a modular design that makes them extremely versatile, so they can be configured to match individual processing requirements, under different operating conditions and in conjunction with different cleaning procedures. This modular thinking means customers only pay for the specific features and capabilities they need, with no unnecessary features and functions. There are also standard configurations in the Unique mixproof valve range. These currently include: • Unique Basic – for low-cost and CIP installations • Unique SeatClean – for standard installations • Unique HighClean – for high-hygiene installations • Unique UltraClean – for installations with exceptionally stringent hygiene requirements • Unique PMO – for compliance with the special drainage requirements included in the Pasteurized Milk Ordinance • Unique TO tank outlet valve – for placing at tank outlets, The unique SpiralClean system is also available as part of   this modular concept. Additional options are available as required – to ensure compliance with particular sets of hygiene requirements or to provide greater resistance to difficult operating environments, for example.