Alfa Laval Unique Mixproof CP-3 Valve

The Alfa Laval Unique Mixproof CP-3 is designed with user flexibility in mind. Configurable for applications in all sanitary industries, including compliance with Grade A Pasteurized Milk Ordinance (PMO) and 3-A Sanitary Standards for continuous dairy processing, the modular design offers a wide variety of options.

Working Principle

Alfa Laval Unique Mixproof CP-3 is remote-controlled by means of compressed air. The valve is a normally closed (NC) valve. The valve has two independent plug seals, forming a leakage chamber between them under atmospheric pressure during every working condition.

In case of rare accidental leaking of product, this will flow into the leakage chamber and be discharged harmlessly through the leakage outlet, without any threat of product mixing or cross contamination. When the valve is open, the leakage chamber is closed. The product can then flow from one line to the other. The valve can be cleaned and water hammer protected to any level according to the needs in the specific process. There is virtually no spillage of product when operating the valve.

Possible Configurations

The Alfa Laval Unique Mixproof CP-3 offers a wide range of options:

Lower Flush
The Alfa Laval lower flush option ensures clean-in-place (CIP) of the lower sealing element and the OD of the lower plug during seat push. This option efficiently cleans the lower seal in the housing without the need for external CIP connections, supporting continuous processing.

Balancing Flexibility
The Unique Mixproof CP-3 valve has a lower balanced plug to avoid product mix, even in the event of pressure spikes in the system. The upper plug can be configured with or without a balancer, depending on the required performance.

The Alfa Laval SpiralClean system makes it possible to clean the upper and lower plugs and leakage chamber by external CIP connections. The system cleans more efficiently, uses less cleaning fluid by ensuring that a directional flow of CIP fluid reaches all the surfaces in much less time than with conventional systems. Spiral Clean of the leakage chamber is not dependent on a special type of plug configuration, but can be added to any of the available plug configurations.

Size Flexibility
The valve body can be configured with mixed sizes. The body sections can be fully combined, including the full range of 1 1/2 inch through 6 inch sizes.

Seat Lift and Seat Push
Seat lift and seat push enable cleaning of the plug seals of either the upper or lower plug individually. The Unique Mixproof CP-3 range is available in a variety of configurations, including two separate actuator versions. An actuator with both upper seat lift and lower seat push or an actuator without any seat lift/push operations only one period.

Product Wetted Steel Parts316L
Other Steel Parts304
Product Wetted SealsEPDM (standard), HNBR, NBR, or FPM
Other SealsCIP seals: EPDM
Actuator seals: NBR
Guide strips: PTFE
Finish OptionsInternal bright (polished) Ra<32µ"
Internal/external bright (internal polished) Ra<32µ"

Note: The Ra values are only for the internal surface.

Technical Data
Product Pressure (max)145 psi (for higher pressure, please ask CSI)
Product Pressure (min)Full vacuum
Temperature Range23°F - +257°F (depending on seal material)
Air Pressure116 psi
Dimensional Data
1 1/2




2 1/2








Weight (lb)3235606084115

*For the A-measure, if there are different upper/lower body sizes, please refer to the Configurator in Alfa Laval Anytime or contact CSI.

**The dimension C can always be calculated by the formula C = ½ID-upper + ½ID-lower + 1.02 inches


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Unique-Mixproof-CP-3-Pressure-Drop-Capacity-Diagram 4
Unique-Mixproof-CP-3-Pressure-Drop-Capacity-Diagram 5
Unique-Mixproof-CP-3-Pressure-Drop-Capacity-Diagram 7
Unique-Mixproof-CP-3-Pressure-Drop-Capacity-Diagram 8

Note: For the diagrams the following applies: Medium is water (68°F). Measurement is in accordance with VDI 2173.


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