Unique Basic Mixproof Valve

The Alfa Laval Basic mixproof valve is a lower cost solution that still provides the safety, separation, and leakage detection needed in a mixproof valve design. It is a normally closed (NC) valve that is controlled from a remote location by means of compressed air. Two independent plug seals separate the two liquids, and the space between the two seals forms an atmospheric chamber. When the valve is open the chamber is closed, allowing the product to flow from one line to the other without spillage.

All Unique mixproof valves are compatible with Alfa Laval ThinkTop valve sensing and control devices, which fulfill regulatory requirements for detection of seat lift and feedback signal.


The exceptional concept of this mixproof valve is characterized by unmatched flexibility, while maintaining simplicity. The reliable, modular design meets individual needs for all mixproof operations with two different products flowing through one valve.

The unique quality of this mixproof valve is the system of combining specific features and functions from a great variety of options offered. It is exceptional in the world of mixproof valves, yet requires minimal service and maintenance.


Unique is remote-controlled by means of compressed air. The valve is a 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 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.

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.


Unique Basic has the basic components for low cost and clean-in-place (CIP) solutions, providing significant safety and leakage detection:

  • Actuator without seat lift
  • Unbalanced plugs
  • No SpiralClean of leakage chamber or plugs

Typical applications could be water inlet for water push of product or CIP supply and return lines. Not suitable in application with risk of pressure shocks or sticky products. Unique Basic mixproof valve is for low-cost solutions.


The Unique concept offers the Alfa Laval SpiralClean system to clean the upper and lower balanced plugs and leakage chamber, helping to meet the high hygienic standards of the sanitary flow industry. The system cleans more efficiently, using less cleaning fluid by ensuring that a directional flow of CIP fluid reaches all the surfaces in less time than with conventional systems. All external CIP systems for Unique include the SpiralClean design as standard. The SpiralClean system allows the Unique mixproof valve to run under aseptic-like conditions. If you apply steam to the CIP pipes, this will form a steam barrier to the atmosphere.

Product Wetted Steel Parts316L
Other Steel Parts304
Product Wetted SealsEPDM, HNBR, NBR, or FPM
Other SealsCIP seals: EPDM
Actuator seals: NBR
Finish OptionsInternal/external matte (blasted) Ra<64µ"
Internal 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)140 psi (For a higher pressure, please ask CSI.)
Product Pressure (min)Full vacuum
Temperature Range23°F - +257°F, depending on seal material (For a higher temperature, please ask CSI.)
Air Pressure116 psi

Dimensional Data










*A Basic Clean20.88222.65527.54127.54135.027
*A Seat Clean20.88222.65526.39826.39831.165
*A High Clean/UltraClean24.07325.84629.94429.94436.327
E Basic/Seat Clean3.9404.7675.8715.5956.974
E High Clean/Ultra Clean5.6746.5017.8807.6049.771
øD Basic4.7284.7287.3287.3287.328
øD Seat Clean, High Clean, and Ultra Clean4.7284.7286.1866.1867.328
L Basic9.0629.06211.07111.07114.933
L Seat Clean, High Clean, and Ultra Clean9.0629.0629.9299.92911.071
Weight (lb) Basic30.
Weight (lb) SeatClean30.
Weight (lb) High-/UltraClean32.

Notes: *For the A-measure, if different upper/lower body sizes, contact Central States Industrial.

**The measure C can always be calculated by the formula C = ½ ID upper + ½ ID lower + 26 mm.


The concept of Unique centers around the customer’s needs and provides modern tailor-made solutions, which are secured for the future. Only Alfa Laval offers the possibility of not choosing unnecessary features and functions, thus avoiding problems caused by a non-adapted product. The Unique mixproof valve is designed with user flexibility in mind. The customer can choose additional options as required individually; for example higher hygiene demands or higher resistance against physically tough conditions.


Unique UltraClean meets the highest demands for hygienic processing. It has:

  • Actuator with seat lift integrated
  • Balanced lower and upper plug
  • SpiralClean of leakage chamber, upper, and lower plug

During the cleaning process, the plugs are lifted independently to ensure cleaning of plugs and seats together with their corresponding pipe. At the same time or separately the leakage chamber and balanced plugs are cleaned with our SpiralClean system. The Unique UltraClean also protects against high pressure and water hammer effect. It has few product wetted seals and allows no product spillage during operation. The Unique UltraClean mixproof valve is the choice for solutions requiring the highest level of hygiene. The UltraClean is suitable for applications with sticky products, products with high content of solids or applications where "close to aseptic conditions" is wanted.


Unique HighClean is sure to meet your processing needs when dealing with sticky products or if no recontamination can be accepted at all, as the valve can be provided with SpiralClean both around spindles and in leakage chamber. The valve is characterized by:

  • Actuator without seat lift integrated
  • Balanced lower and upper plug
  • SpiralClean of leakage chamber, as well as of upper and lower plug

With balanced plugs, the configuration of this valve protects against high pressure and water hammer effect.


Unique SeatClean meets the typical demands of a process valve in the food and drink industry. It is also suitable for products with solids. Cleaning of the plugs and seats are performed by means of seatlift during normal cleaning procedure. This valve also includes a balanced lower plug that eliminates the risk of mixing products by pressure shock or when the pressure in the pipe is high. Its features are:

  • Actuator with seat lift integrated
  • Balanced lower plug, unbalanced upper plug
  • No SpiralClean of leakage chamber or plugs

Unique SeatClean is the choice for standard solutions.


Unique-Basic-Pressure-Drop-Capacity-Diagram PSI



Note: Medium is water (68°F). Measurement will be in accordance with VDI 2173.

Create a MyCSI Dashboard to save resources for quick reference, track orders, and talk with experts.