Home » Valves » Double Seat Valves » Unique Mixproof Large Particle

Unique Mixproof Large Particle

Unique Mixproof Large ParticleConcept

This Unique Mixproof LP-F valve is based on the well proven and exceptionally flexible design of the Unique Mixproof valves. The valves are designed for gentle handling of the product containing large particulates up to 45 mm or products with high viscosity.

Additional to the Unique Mixproof Large Particle valve (LP) the LP-F is equipped with a lower flush to enable 100% cleanability of the lip seal in the lower sealing element through seat-lift cleaning alone. This an improved performance compared to Spiral clean on the lower plug and reduces the need for additional utility installations for external CIP.

Working Principle

Unique Mixproof LP-F is remote-controlled by means of compressed air. The valve is a normally closed (NC) valve. It is as standard supplied seat lift, which enables handling of two different products at the same time, or safe handling of one product while seat-lift cleaning operations are being conducted in the other portion of the valve – all without any risk of cross-contamination.

The 6″ valve is as standard also equipped with balanced lower plug to protect against the effects of high pressure and water hammer. The 4″ valve is, in order to accommodate 45mm particles, not supplied with balanced lower plug. The 4″ is however as standard equipped with a boost actuator to accommodate a product pressure of up to 10 bar. When seat lift of the lower plug is performed the valve will simultaneously clean the lower plug seal as well as the lover sealing element lip seal.


How It Works


The unique mixproof valve concept is based on a series of base components, including valve body, valve plug, actuator and cleaning options and accessories that support a wide range of applications. Using these components, you can build a Unique mixproof valve to match your exact process requirements.

To facilitate maintenance, the Unique mixproof valve also features leakage detection holes that provide advance notification of wear or damage to static o-rings. Operators can visually inspect the valve at any time without having to disassemble it.

Operating principle

The Alfa Laval Unique mixproof valve is a normally closed (NC) valve that is controlled from a remote location by means of compressed air. To separate the two liquids, the valve has two independent plug seals. The space between the two seals forms an atmospheric leakage chamber. In the rare case of accidental product leakage, the product flows into the leakage chamber and is discharged through the leakage outlet.

When the valve is open, the leakage chamber is closed. The product can then flow from one line to the other without spillage. The valve can easily be cleaned and protected against the effects of water hammer according to the specific requirements of the process and the configuration of the valve. (There is no product spillage during valve operation).


SpiralClean system

To ensure the hygienic operating condition of its Unique mixproof valve range, Alfa Laval offers its SpiralClean system to clean the upper and lower balanced plugs and leakage chamber of the valves. Using less cleaning fluid, utilities and time, SpiralClean cleans more thoroughly and efficiently than conventional cleaning devices. All external CIP systems for Unique mixproof valves include the SpiralClean design as standard.

Another big benefit: SpiralClean enables the Unique mixproof valve to operate under aseptic-like conditions, creating a steam barrier to the atmosphere upon applying steam to the CIP pipes.


  • 3-A version available upon request
  • Product wetted seals HNBR, NBR or FPM
  • Male parts or clamp liners in accordance with required standard
  • Control and indication: ThinkTop or ThinkTop Basic
  • Side indication for detection of upper seat lift

Make an Online Enquiry

[contact-form-7 404 "Not Found"]