Aseptic Mixproof | Alfa Laval

Construction

The Alfa Laval Aseptic Mixproof Valve is a double-seat valve based on the same modular architecture as the well-proven aseptic version of the Alfa Laval Unique Single Seat Valve (SSV). It is comprised of a valve body, valve plug/diaphragm, actuator and cleaning options and accessories that support a broad range of process requirements. This diaphragm is composed of a PTFE face and reinforced EPDM backing, which create a hermetic seal to ensure sterile processing conditions. Built-in leakage detection enables operators to inspect the valve easily without having to disassemble it and to act immediately if action is required.

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Operating principle

This pneumatically operated aseptic double-seat valve is controlled from a remote location by means of compressed air. Aseptic and modular, it has few and simple moveable parts, which makes it a very reliable valve with low maintenance costs. An integrated valve plug/diaphragm secures aseptic operation.

To separate the two fluids, the valve has two independent plugs and seals. The space between the two plugs forms a sterile barrier in the leakage chamber to ensure aseptic processing and prevent mixing of products. In the rare case of accidental product leakage 

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from one seal, the product flows into the leakage chamber and is discharged through one of the steam valves, which also acts as a leakage outlet.

When main actuation takes place, the two product valves opens; the two steam valves must close to prevent product spillage. The sterile barrier is then moved from the leakage chamber to the backside of the plugs in the two steam valves.

To clean the leakage chamber after main activation, you can utilize condensate to flush and when it is clean you add the steam to sterilize and generate the sterile barrier.

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