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Unique PMO Plus Mixproof Valve (US) for hygienic dairy processing with PMO-compliant double-seat design

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Unique PMO Plus Mixproof Valve (US) for hygienic dairy processing with PMO-compliant double-seat designUnique PMO Plus Mixproof Valves (US)

The Alfa Laval Unique PMO Plus® mixproof valve offers all the performance of a Unique Mixproof valve and, in addition, meets the requirements of 3-A/PMO standards. The mixproof valve design allows clean-in-place (CIP) fluid to flow to clean one chamber while product is running in the other chamber, without the risk of cross-contamination. Eliminating clean-in-place (CIP) downtime and allowing automated product transfer are just two of the advantages that mixproofs provide. Unique PMO Plus Mixproof Valves combine Alfa’s superior cleanability and reliability with the required features for meeting the PMO standard making it a powerful solution for dairy applications.

Related Industries:

Processed Foods, Dairy

PMO-compliant mixproof valves

With the most complete and consistent family of valves available, each PMO variant is based on the same trusted and proven standard PMO mixproof valve – backed by thousands installed globally. Alfa Laval Unique PMO (Pasteurized Milk Ordinance) mixproof valves meet the stringent requirements of the FDA’s Pasturized Milk Ordinance and are fully 3A compliant. All seat movements are detectable, using Alfa Laval ThinkTop® valve sensing and control devices. This makes Unique PMO mixproof valves an extremely secure solution to help manage and optimize the flow of your individual dairy processes.

Unique PMO mixproof valves are primarily installed in the US – globally standard Unique mixproof valves are the preferred choice.

Modular design – flexible valve installations

The Unique PMO mixproof range is constructed from a series of base components that provide flexible configurations to fit your application requirements. Because the same valve body is utilized in all standard mixproof valve configurations, upgrading is fast with no need to remove the valve body; simply exchange the plugs, actuators and other minor elements. The benefit is an ease of interchangeability exclusive to Alfa Laval where any installed standard PMO valve can be easily upgraded from PMO to PMO – F, to PMO Plus® to PMO Plus – CP.

Lower total cost of ownership

Cost-saving features include the top-loaded, easy-to-disassemble design, no adjustable components and fully protected, long-life radial seals.

Unique PMO valve range

Alfa Laval offers the most comprehensive range of PMO-compliant mixproof valves:

Standard Unique PMO Mixproof Valves:

  Unique PMO complies with the FDA`s Pasterized Milk Ordinance (PMO) and covers all mixproof dairy applications.
 

Unique PMO-F for cleaning or flushing product build-up during continuous operation
 

Unique PMO Plus® allows seat lift cleaning in one chamber while product is the the other.
 

Unique PMO Plus® CP for continuous product processing in any chamber while cleaning product in the other chamber

Unique PMO Mixproof Valves for Special Processing Applications:

  Unique PMO horizontal tank valve completely drainable in horizontal positions – for continuous processing right up to the tank port.
  Unique PMO vertical tank valve completely  drainable in vertical positions – for continuous processing right up to the tank port.
 

Unique PMO Cheese Curd for gentle, yet efficient, handling of large curd particles
 

Unique PMO Curd CP for continuous cheese curd processing with large particles in any chamber while cleaning product in the other chamber

Construction

The Alfa Laval Unique PMO mixproof valve consists of a valve body, two independent balanced valve plugs/seals, actuator with seat lift, position-detectable upper and lower valve seats and a yoke-mounted, external sensor.

Operating principle

The Alfa Laval Unique PMO 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 chamber.

When the valve is open, the 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.

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

Options

• Fittings in accordance with required standard.

THE PASTEURIZED MILK ORDINANCE (PMO)

Paragraph 15p(B) of the Pasteurized Milk Ordinance (PMO) outlines the requirements for the use of mixproof valves in applications involving milk products and cleaning solutions to ensure the hygienic and safe separation of dairy products flowing concurrently through the same valve.

The PMO requires that:

  • Both valve seats must be position detectable
  • The leakage chamber, found in all mixproof valves, must have the same cross-sectional area as the valve body port connections
  • The actuator must be fail-safe by spring-to-close

In 2007, the Food and Drug Administration (FDA) changed the PMO to allow clean-in-place (CIP) solution to clean one valve seat while product is flowing in the opposite housing. This change virtually eliminates CIP downtime, so processors can run continuous dairy operations and increase production.

In 2008 the FDA issued memorandum M-b-356, confirming that Alfa Laval’s Unique PMO Plus mixproof valve is Pasteurized Milk Ordinance paragraph 15p(B) compliant.

The following benefits make the Unique PMO Plus stand out from the competition:

  • Proven design: Same fundamental technology used in the industry for more than a decade
  • Retrofittable: Replacement of a few components enables conversion of installed Unique PMO valves to Unique PMO Plus
  • Only three elastomers in the isolation chamber: Minimizes risk of product contamination
  • Tested and FDA compliant to 145 psi: The highest operating pressure available for the widest range of process applications
  • Designed with a mix of radial and axial seals: A proven, leading design to protect product
  • Standard, single unit actuator: Simple operation with fewer moving parts
  • Same wetted and actuator service kits as the unique PMO valve: No need to learn or stock new parts
  • Maintenance friendly: No adjustments are required when reassembling the valve after service

CONCEPT

This Unique PMO Plus Mixproof valve is based on the well proven and exceptionally flexible design of the Unique PMO Mixproof valves from Alfa Laval. It meets the demands from the 3-A/PMO (Pasteurized Milk Ordinance paragraph 15p(B)) standards saying that all movements have to be detectable, as well as the vent tube has to have the same or greater area than the connection pipe. Furthermore, the Unique PMO Plus meets the FDA demands for seat lift compliance M-b 356. This allows CIP flow to clean one chamber while product is running in the other chamber, thus eliminating CIP downtime. Finally, the actuator is fail-safe by spring-to-close.

WORKING PRINCIPLE

Unique PMO Plus 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 which is at atmospheric pressure or less during every working condition. In the rare case of fluid passing a valve seat, the fluid will enter the leakage chamber and be discharged through the leakage outlet. When the valve is open, the leakage chamber is closed.

BUILD-UP

This PMO Plus edition of the Unique Mixproof valve is a high-end valve with regards to process security as well as from a sanitary point of view. The valve plugs are always balanced in both upper and lower valve body, securing no sensitivity to pressure spikes. The lower and upper seats are position-detectable by the ThinkTop® and a yoke-mounted, external sensor.

MATERIALS

Product Wetted Steel Parts 316L
Other Steel Parts 304
Product Wetted Seals NBR (std.), EPDM, HNBR, or FPM
Other Seals CIP seals: EPDM
Actuator seals: NBR
Finish 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, contact CSI)
Product Pressure (min) Full vacuum
Temperature Range 23°F – +257°F (Depending on seal material) (For higher temperature, contact CSI)
Air Pressure 116 psi

Instruction manual – Unique PMO Plus® CP Mixproof Horizontal Tank Valve – EN

US Instruction manual – Unique PMO Plus® + Unique PMO Plus® CP – EN

Instruction manual – Unique Mixproof Large Particle Valve + Large Particle Valve-F – ENUS

Instruction manual – Unique PMO Plus® CP Mixproof Vertical Tank Valve – ENUS

Need a hygienic valve that meets US PMO standards for dairy processing? Contact us now to explore how the Unique PMO Plus Mixproof Valve ensures safe, efficient, and compliant operations.