Double seat valves

Modular and versatile, Alfa Laval mixproof valves are double block-and-bleed valves that handle the simultaneous flow of two different products or fluids through the same valve at critical pipeline junctions without the risk of cross-contamination. These Alfa Laval mixproof valves provide exceptional operation, enhanced cleanability and high customizability to meet any hygienic process requirement. What you get is more uptime and the lowest total cost of ownership.

Safe, efficient, hygienic handling of two fluids through the same valve without the risk of cross-contamination

  • Maximum product safety, minimized risk of cross-contamination
  • Enhanced product yield due to cost-effective, spillage-free operation
  • Optimized plant efficiency and enhanced cleanability
  • More uptime due to spillage-free design with double lip seal, built-in leakage detection and leakage chamber
  • Fully configurable with a broad range of models and options to meet virtually any hygienic processing requirement

Rely on Alfa Laval mixproof valves for more uptime, greater flexibility, reliable operation, optimized maintenance, and easy cleanability. Select only for the features and functionality you require now; modularity lets you easily upgrade the valves to meet your changing needs. Plus enjoy an exceptional service life and reduced utility costs from each of mixproof valves. Hygienic, high purity, aseptic and specialized versions are available for use across the dairy, food, beverage, home-personal care, and biotech and pharmaceutical industries. To better manage your mixproof valves, pair them with Alfa Laval sensing an control units.




How does a mixproof valve work?

The Alfa Laval Unique mixproof valve is a normally closed (NC) valve controlled from a remote location by means of compressed air. The valve has two independent plugs and seals to separate the flow of liquids and prevent cross-contamination; the space between the seals forms a leakage chamber at atmospheric pressure during every working condition. In the rare event that leakage may occur, product flows into the leakage chamber and exits through the bottom outlet for easy detection. When the valve is open, the leakage chamber is closed. The product then flows from one line to the other.



Happy Customers

TINE SA, Norway

“We recommend Alfa Laval equipment, such as LKH pumps and Unique mixproof valves, because we know that they are reliable, hygienic and easy to maintain,”


Owe Barsten, Sales Manager, Components & Service, Skala AS.


Read the case story about TINE SA, Norway

Moloko Gorodets Dairy, Russia

"We can count on continuous operations, thanks to the superior quality, reliability and service and support of Alfa Laval equipment, automation technology and components."

Mr. Gennadiy Zolotuhin, Master mechanic, Moloko Gorodets Dairy’s.


Read the case story about Moloko, Russia

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Close at hand catalogue about valves

At your fingertips: Alfa Laval hygienic valves to ensure the most efficient flow of fluids through your process lines. Our ‘Close at hand’ catalogue details everything you need to determine the optimal flow solution for your processes. What you get is no risk of cross-contamination, increased safety, more uptime and cost savings, and greater productivity.


Services for hygienic valves

To ensure continuous uptime for your hygienic processes, extend the lifetime of your hygienic valves. With Alfa Laval as your service partner, you have access to our global service network and experts when you need it and local support when it counts. Rely on our broad range of services to optimize your processes – whenever, wherever.


Bring your sustainability strategy to life

Get more energy and water savings and reduce emissions from your hygienic processing lines. Our monthly newsletter, near, brings you stories about how Alfa Laval can support you in improving environmental performance across the dairy, food, beverage, home-personal care and pharmaceutical industries. What’s good for people and planet is good for your business too.