Double seat valves
Double seat valves
Modular and versatile, Alfa Laval mixproof valves are double block-and-bleed valves that handle the simultaneous flow of two different products or fluids through the same valve at critical pipeline junctions without the risk of cross-contamination. These Alfa Laval mixproof valves provide exceptional operation, enhanced cleanability and high customizability to meet any hygienic process requirement. What you get is more uptime and the lowest total cost of ownership.
Key Benefits
- Safe, efficient, hygienic handling of two fluids through the same valve without the risk of cross-contamination
- Maximum product safety, minimized risk of cross-contamination
- Enhanced product yield due to cost-effective, spillage-free operation
- Optimized plant efficiency and enhanced cleanability
- More uptime due to spillage-free design with double lip seal, built-in leakage detection and leakage chamber
- Fully configurable with a broad range of models and options to meet virtually any hygienic processing requirement
Rely on Alfa Laval mixproof valves for more uptime, greater flexibility, reliable operation, optimized maintenance, and easy cleanability. Select only for the features and functionality you require now; modularity lets you easily upgrade the valves to meet your changing needs. Plus enjoy an exceptional service life and reduced utility costs from each of mixproof valves. Hygienic, high purity, aseptic and specialized versions are available for use across the dairy, food, beverage, home-personal care, and biotech and pharmaceutical industries. To better manage your mixproof valves, pair them with Alfa Laval sensing and control units.
How does a mixproof valve work?
The Alfa Laval Unique mixproof valve is a normally closed (NC) valve controlled from a remote location by means of compressed air. The valve has two independent plugs and seals to separate the flow of liquids and prevent cross-contamination; the space between the seals forms a leakage chamber at atmospheric pressure during every working condition. In the rare event that leakage may occur, product flows into the leakage chamber and exits through the bottom outlet for easy detection. When the valve is open, the leakage chamber is closed. The product then flows from one line to the other.
Aseptic Mixproof
Boost uptime, product safety, productivity and shelf life with the Alfa Laval Aseptic Mixproof Valve. It enables the simultaneous flow of two different products or fluids through the same valve without risk of cross-contamination. With its highly flushable design and no domes in the product and steam areas, this modular, easy-to-configure double seat mixproof valve makes cleaning and sterilization faster and more efficient than other aseptic mixproof valves. It also complies with the strict requirements of 3-A Sanitary Standards.
Aseptic Mixproof Valve Benefits
- Maximizes product safety due to the sterile, modular design of the valve body and hermetic seal
- Reduces total cost of ownership compared to other aseptic designs
- Configures easily to meet virtually any requirement
- Increases cleaning capabilities with highly flushable design
- Minimizes product loss
Outstanding flexibility and modularity
The Alfa Laval Aseptic Mixproof Valve shares the same versatile platform as the proven aseptic version of the Alfa Laval Unique Single Seat Valve (SSV). Configure the aseptic double-proof valve to meet virtually any requirement. Choose a standard valve body and a tangential valve body or use two standard valve body types. Mount the valves in either a horizontal or a vertical position and tailor it to your exact requirements by selecting the right actuator, seat lift, steam valve and options for steam temperature monitoring.
Exceptional hermetic seal
Safeguard process efficiency and product safety while reducing costs with the Alfa Laval Aseptic Mixproof Valve. Its hybrid diaphragm with PTFE face and reinforced EPDM backing ensures the same proven hermetic seal as the Alfa Laval Unique SSV Aseptic Valve. This drastically reduces the total cost of ownership for sterile processing compared to steel bellows-type aseptic valves.
Ease of maintenance and parts replacement
Maintenance is easy with the Alfa Laval Aseptic Mixproof Valve. Simply follow the same routines and use the same replacement parts as the Alfa Laval Unique SSV Aseptic Valve. This streamlines your spare parts inventory and saves costs.
Model sizes: ISO 51 mm (2”), 63.5 mm (2.5”) and 76.1 mm (3”).
Low total cost of ownership
Realize savings of up to 45% with the Alfa Laval Aseptic Mixproof Valve versus aseptic valves from other manufacturers. Longer service life, minimized product loss, greater product safety and more uptime make significant cost reductions possible. In addition, effective CIP and SIP procedures reduce cleaning cycle times and the consumption of cleaning fluids, water and utilities.
Product Video
How it works
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 comprises a valve body, valve plug/diaphragm, actuator and cleaning options. The diaphragm consists of a PTFE face and reinforced EPDM backing to create a hermetic seal for sterile processing. Built-in leakage detection enables easy inspection without disassembly and immediate action if needed.
Operating principle
This pneumatically operated aseptic double-seat valve is controlled remotely via compressed air. It has few and simple moving parts, making it a reliable, low-maintenance choice. An integrated valve plug/diaphragm secures aseptic operation.
To separate the two fluids, the valve has two independent plugs and seals. The space between them forms a sterile barrier in the leakage chamber. In the rare event of leakage, the product flows into this chamber and is discharged through a steam valve.
When actuated, the two product valves open, and the steam valves close to prevent spillage. The sterile barrier shifts to the plug backsides in the steam valves. After main activation, the leakage chamber can be flushed with condensate, then sterilized with steam to maintain the barrier.
Options
- Control and indication: ThinkTop, ThinkTop D30, ThinkTop Basic or IndiTop
- Product wetted seals in EPDM or HNBR
- Maintainable actuator
- Seat lift
- Tangential or standard valve housing
- Temperature sensor or transmitter
- Hygienic or aseptic steam valves
- Changeover or shutoff steam inlet valve
Unique Mixproof
Alfa Laval Unique Mixproof valves enable the simultaneous flow of two products or fluids through the same valve without the risk of cross-contamination thanks to their double seat valve design. Their exceptional spillage-free operation is compliant with most hygienic standards and supports safe, efficient, and hygienic flow management.
Safe and efficient flow management
- Long-lasting, spillage-free operation and minimal risk of product contamination thanks to state-of-the-art double-seat design.
- Safe and hygienic operation with added protection of double lip seals.
- Easy and fast maintenance due to top-loaded design.
- Ease of operation – no adjustable components, maintenance-friendly actuator, and built-in leakage detection on all seals.
- Cost-effective – a single Unique Mixproof valve can often replace two or more other types of valves.
The modular concept enables you to tailor the valves to your exact requirements and pay only for features you need. Combine them with Alfa Laval ThinkTop V70 sensing and control units for full functionality.
How does the Unique Mixproof valve work?
Based on the well-proven and versatile principle of Unique Mixproof valves, this valve design enables safe handling of two different products simultaneously or safe cleaning of one line while product flows in the other. The double tangential design ensures full drainability, especially when mounted at the bottom of a flat-bottomed tank. The horizontal tank version shares most components (actuator, yoke, seals) with the standard valve, ensuring easy serviceability and low total cost of ownership.
When open, the leakage chamber closes to allow product flow; when closed, the leakage chamber opens, preventing cross-contamination. The design features built-in leakage detection and double seals for optimal safety.
Exceptional spillage-free operation
A state-of-the-art double-seat design provides long-lasting, spillage-free operation, minimizing the risk of product contamination. Double lip seals offer additional safety and hygienic protection.
Easy to maintain and clean
Unique Mixproof valves feature a top-loaded design for fast, easy maintenance. There are no adjustable components, a maintenance-friendly actuator, and built-in leakage detection on all seals. Optional SpiralClean ensures thorough cleaning of the leakage chamber and spindles. These valves meet most hygienic standards and can be upgraded as needed.
Valve clusters – customized flow solutions
We specialize in pre-built valve clusters customized to meet specific, individual requirements. Our expertise ensures efficient flow management with as few components as possible, effectively addressing thermal cycling, cleanability, drainability, and flow control. Alfa Laval valve clusters come pre-assembled and pre-tested, fully wired, and with pneumatic tubing and control panels pre-connected. This minimizes installation time and avoids lost revenue from downtime.
For more information, refer to the Documentation and Selection Guide. For cost-effective alternatives to the Unique Mixproof range, Alfa Laval also offers standard SMP mixproof valves. Combine with Alfa Laval ThinkTop and ThinkTop Basic for full process control.
Unique Mixproof 3-Body
Alfa Laval Unique Mixproof 3-Body valves enable the simultaneous flow of two different products or fluids through the same valve without risk of cross-contamination. The valve is also equipped with a changeover function, making it ideal for hygienic applications that require high flexibility and safety.
Cost-effective, safe and spillage-free operation
- Operates spillage-free, minimizing product loss and contamination risk.
- Simplified maintenance with top-loaded design and no adjustable components.
- High level of hygiene and outstanding safety level.
- Based on a proven platform ensuring maximum uptime and low total cost of ownership.
The Unique Mixproof 3-Body valve's modular, three-valve-body design provides reliable fluid handling and safety, offering significant savings and efficiency gains.
Cost-effective mixproof valve
Achieve exceptional results and save money by replacing two or more traditional valves with one Unique Mixproof 3-Body valve. Two independent plugs and a fully balanced design enable two different fluids to pass through without cross-contamination, even during pressure shocks.
Exceptional spillage-free operation
The advanced double-seat design ensures long-lasting, spillage-free performance. Double lip seals provide additional protection to secure safe and hygienic operation.
Easy to clean and maintain
Maintenance and cleaning are quick and easy due to the top-loaded design, no adjustable components, a maintenance-friendly actuator, and built-in leakage detection on all seals. The valve is always equipped with seat lift and seat push functions to meet stringent hygienic standards.
Easy to configure and upgrade
Customize the Alfa Laval Unique Mixproof 3-Body valve to suit your specific needs. Its modular design supports future process adaptations while ensuring efficient, hygienic, and continuous production.
You get the full benefit of using Unique Mixproof valves by combining them with Alfa Laval ThinkTop and ThinkTop Basic valve sensing and control units.
How it works
Construction
The Unique Mixproof 3-Body valve is based on modular base components: valve body, valve plug, actuator, and cleaning accessories. Leakage detection holes allow early identification of wear or damage to static o-rings, enabling visual inspection without disassembly.
Operating principle
The valve has a normally closed (NC) mixproof seat and a normally open (NO) single seat, controlled remotely via compressed air. Two independent plug seals form an atmospheric leakage chamber that prevents cross-contamination. During operation, this chamber alternates between open and closed states to control product flow safely and prevent spillage.
The valve can be easily cleaned and protected against water hammer effects, maintaining high safety even during rapid flow changes.
Unique Mixproof CIP
Efficiently manage Cleaning-in-Place (CIP) media at critical system distribution points with the Alfa Laval Unique Mixproof CIP. Purpose-built for CIP media routing, this lightweight, double-block-and-bleed valve ensures CIP line safety. It directs pressurized cleaning fluids toward the area that requires cleaning without the risk of cross-contamination. This versatile CIP valve adapts to process requirements while meeting hygiene standards.
Purpose-built double seat valve for CIP media
- Ensures safe, reliable, and cost-efficient routing of CIP media.
- Eliminates the risk of cross-contamination and ensures product safety.
- Enhances the reliability and flexibility of your CIP and process setup.
- Minimizes unplanned downtime and maintenance time and costs.
- Improves sustainability by reducing water and CIP media consumption.
- Lowers total cost of ownership with a proven, efficient design.
Efficiently fill, empty, and clean your processing and CIP lines without contamination risk using the Alfa Laval Unique Mixproof CIP valve. Its modular design allows easy adaptation to various applications, capacities, and changing needs.
Maintenance is straightforward, with longer service intervals and reduced water and CIP media usage. Available in various sizes, the valve ensures complete control and can be mounted upside down if required.
How it works
Unique Mixproof CP-3
The Alfa Laval Unique Mixproof CP-3 Valve is a versatile, highly efficient and lightweight valve for the safe and efficient management of fluids at intersection points in valve-matrix and piped systems. Based on the well-proven and exceptionally versatile principle of the Unique Mixproof valves from Alfa Laval, it enables the simultaneous flow of two different products or fluids through the same valve without any risk of cross-contamination.
Key benefits of the Unique Mixproof CP-3 Valve
- Highly efficient lightweight design with reduced venting.
- Gentle product handling and enhanced product safety.
- Cost-effective, spillage-free operation.
- Optimized plant efficiency and enhanced cleanability.
- Reliable leakage detection and easy leakage chamber cleaning.
- Fully configurable to meet your exact process needs.
The valve is compliant with most hygienic standards, including 3-A Sanitary Standards, the Pasteurized Milk Ordinance, and FDA seat lift requirements. Its modular design and wide range of options allow customization for any application while minimizing downtime and CIP media consumption. The CP-3 Valve is ideal for continuous hygienic flow management, making it a preferred choice across the dairy, food, beverage, and other industries.
Cost-effective mixproof valve
Alfa Laval Unique Mixproof CP-3 features two independent plugs designed to be PMO compliant and meet strict 3A Sanitary Standard 85-03 requirements, ensuring the leakage chamber remains at atmospheric pressure or less during all working conditions. As a result, a single Unique Mixproof CP-3 valve can often replace two or more conventional valves.
Exceptional spillage-free operation
The advanced double-seat design ensures long-lasting, spillage-free operation, minimizing the risk of product contamination. Double lip seals add extra protection for safe and hygienic operation.
Easy maintenance and cleaning
These valves are designed for quick, easy maintenance with a top-loaded design, no adjustable components, a maintenance-friendly actuator, and built-in leakage detection on all seals. The CP-3 valve meets stringent hygienic standards and can include the optional SpiralClean system for enhanced cleaning.
Combine Unique Mixproof valves with Alfa Laval ThinkTop or ThinkTop Basic valve sensing and control units to get the most benefit.
Valve clusters - customized flow solutions
We specialize in providing pre-built valve clusters customized to meet specific requirements. Our expertise ensures efficient flow management using as few components as possible, addressing thermal cycling, cleanability, drainability, and flow control. Pre-assembled and pre-tested clusters can be fully wired and fitted with all pneumatic tubing, junction boxes, and control panels, reducing installation time and avoiding lost revenue from on-site troubleshooting and downtime.
How it works
The Unique Mixproof CP-3 valve is based on a modular system with components including valve body, plug, actuator, and cleaning accessories that support various applications. Leakage detection holes provide advance warning of wear or damage to static o-rings, allowing visual inspection without disassembly.
As a normally closed (NC) valve controlled remotely by compressed air, it uses two independent plug seals with an atmospheric leakage chamber in between. In the rare event of leakage, product drains safely through the leakage outlet.
When open, the leakage chamber is closed, allowing product flow from one line to another without spillage. When closed, the leakage chamber is open, ensuring product does not spill during valve actuation. The valve is easily cleaned and protected against water hammer according to your process configuration, ensuring no product spillage during operation.
Unique Mixproof Horizontal Tank
The Alfa Laval Unique Mixproof Horizontal Tank Valve is a versatile, highly flexible double block-and-bleed valve designed for safe, efficient management of fluids at horizontal tank connections and matrix piping systems. Based on the proven Alfa Laval Unique Mixproof Valve platform, the HT Mixproof Valve allows simultaneous handling of two different products or fluids without any risk of cross-contamination.
Key features
Designed for horizontal mounting on the tank side or as a space-saving alternative at the bottom of a cone-formed tank, its self-cleaning design ensures complete cleanability even in shadow areas. The valve also enables simultaneous filling and emptying of tanks, supporting continuous and safe process flow across dairy, food, beverage, and many other industries.
State-of-the-art horizontal mixproof valve design
This valve shares proven components with other Unique Mixproof valves, such as the actuator, yoke, and seals — providing easy serviceability and lower total ownership costs. Supplied with seat lift as standard, it enables safe handling of different products and seat-lift cleaning simultaneously. The double tangential body design ensures full drainability, especially when mounted at the tank bottom.
Exceptional spillage-free operation
The double-seat design ensures long-lasting, spillage-free operation and minimizes contamination risk. Double lip seals add extra protection for safe, hygienic processing.
Easy valve maintenance and cleaning
Top-loaded design simplifies maintenance. No adjustable components, a maintenance-friendly actuator, and built-in leakage detection on all seals. Optional SpiralClean system is available for advanced cleaning.
Combine with Alfa Laval ThinkTop or ThinkTop Basic valve sensing and control units for complete system control.
Valve clusters — customized flow solutions
We provide pre-built valve clusters tailored to your process needs, minimizing components and addressing thermal cycling, cleanability, drainability, and flow control challenges. Delivered pre-assembled and fully wired, clusters reduce installation time and avoid costly downtime from on-site troubleshooting.
Product benefits
- Cost effective
- Safe and hygienic operation
- Easy to maintain and clean
Options
- 3-A version available upon request
- Product wetted seals: HNBR, NBR, or FPM
- Male parts or clamp liners as per required standard
- Control and indication: ThinkTop or ThinkTop Basic
- Side indication for detection of upper seat lift
How it works
The Unique Mixproof Horizontal Tank Valve features a self-cleaning design using two specialized CIP nozzles. The first nozzle projects cleaning solution through the tank connection, thoroughly cleaning seat contact surfaces and shadow areas. The second is a rotating CIP nozzle for optimal cleaning of the full-bore leakage chamber.
The single valve body design allows direct tank welding or Tri-clamp connection. Models with 4” and 6” openings feature a 45 mm opening to handle very large particles or highly viscous fluids effectively.
Unique Mixproof Large Particle
For applications with very large particles or highly viscous fluids, the Alfa Laval Unique Mixproof Large Particle valve offers the same advantages as standard Unique Mixproof valves, but is specially designed with large openings up to 45 mm in diameter.
Cost-effective mixproof valve
Alfa Laval Unique Mixproof valves feature two independent plugs, allowing a single valve to replace two or more other valve types. This results in significant cost savings and simplified installations.
Exceptional spillage-free operation
The state-of-the-art double-seat design ensures long-lasting, spillage-free operation while minimizing the risk of product contamination. Double lip seals provide extra protection to ensure safe and hygienic processing.
Easy valve maintenance and cleaning
Unique Mixproof valves feature a top-loaded design, making maintenance quick and easy. They include no adjustable components, a maintenance-friendly actuator, and built-in leakage detection on all seals. They meet most hygienic standards and can be equipped with the optional SpiralClean cleaning system.
Combine them with Alfa Laval ThinkTop and ThinkTop Basic valve sensing and control units to maximize system reliability and control.
Valve clusters — customized flow solutions
We specialize in delivering pre-built valve clusters customized to your process requirements. Our expertise ensures efficient flow management using as few components as possible while effectively addressing thermal cycling, cleanability, drainability, and flow control. Valve clusters are pre-assembled, pre-tested, and fully wired with pneumatic tubing and control panels, helping you avoid costly on-site troubleshooting and downtime.
For more information, please refer to the Documentation and Selection Guide below. For a cost-effective alternative, Alfa Laval also offers standard SMP mixproof valves.
Product benefits
- Cost effective
- Safe and hygienic operation
- Easy to maintain and clean
Options
- Optional SpiralClean cleaning system
- Compatible with Alfa Laval ThinkTop and ThinkTop Basic control units
How it works
The Unique Mixproof Large Particle valve is based on the same versatile principle as other Unique Mixproof valves, sharing many components such as the actuator, yoke, and seals — which simplifies service and reduces total cost of ownership.
It is supplied as standard with seat lift, enabling handling of two different products at the same time or safe handling of one product while seat-lift cleaning operations take place. The double tangential design ensures full drainability, especially when mounted at the bottom of a flat-bottomed tank.
Unique Mixproof Process
Safeguard process fluids at valve matrices and pipelines using the cost-effective Alfa Laval Unique Mixproof Process valve. This economical version of our premium double seat mixproof valves with seat lift eliminates the risk of cross-contamination. High cleanability, the ability to withstand pressure peaks, and fit-for-purpose components make this valve a great addition to dairy, food, and beverage applications. It is available in various sizes to meet your hygienic processing requirements.
Cost-effective double seat valve for hygienic applications
Get the product safety you need by eliminating the risk of cross-contamination and product loss while ensuring efficient cleaning. The valve enhances the reliability and flexibility of your process setup with proven valve technology tailored to your specific production needs. Minimize unplanned downtime, lower maintenance efforts, and reduce environmental impact thanks to minimized water and CIP media consumption and no spillage.
The Alfa Laval Unique Mixproof Process is a fit-for-purpose double seat valve with a seat lift function. Based on the proven Unique Mixproof and Unique Single seat valves, it is certified to FDA, 3-A, and other recognized standards. The valve protects your products, even at high pressures. Its modular design makes it easy to adapt to various applications and changing capacity requirements.
Service is simplified thanks to a maintenance-free actuator and proven seal technology with defined compression that extends maintenance intervals. Enhance sustainability by combining it with an Alfa Laval ThinkTop valve control unit, saving up to 90% in water, cleaning media, and wastewater costs.
Product benefits
- Cost-effective and reliable
- Eliminates risk of cross-contamination
- Minimizes environmental impact
- Easy to maintain and service
- Certified to FDA, 3-A standards
Options
- Compatible with Alfa Laval ThinkTop control units
- Available in various sizes to match requirements
How it works
The Alfa Laval Unique Mixproof Process valve is a normally closed (NC) valve controlled remotely by compressed air. The valve has two independent plugs and seals to separate the liquids; the space between the seals forms a leakage chamber at atmospheric pressure under all operating conditions. Leakage rarely occurs, but if it does, the product flows into the leakage chamber and is discharged through the outlet at the bottom of the chamber for easy detection.
When the valve is open, the leakage chamber is closed. The product then flows from one line to the other. The well-known radial design ensures virtually no product spillage during valve operation.
Unique Mixproof Tank Outlet
Trust the Unique Mixproof Tank Outlet to handle the simultaneous flow of product or fluid through the same valve without the risk of cross-contamination in the tank. Mounting the hygienic double seat valve vertically under the tank or horizontally directly on the tank wall at inlets and outlets ensures cost-effective, spillage-free operation. Full valve drainability guarantees easy maintenance and state-of-the-art cleanability while securing flexibility, productivity, and product quality.
Cost-effective, spillage-free tank outlet valve
Fill or empty your hygienic processing tanks safely and efficiently with the Alfa Laval Unique Mixproof Tank Outlet double seat valves. Two independent plugs and seals with double lip seals guarantee safe, hygienic, long-lasting, spillage-free operation, minimizing the risk of contamination. The valve adapts easily to various process requirements and delivers maximum yield and process efficiency.
Maintenance is quick and easy. Simply access all necessary parts from one side of the valve. With no adjustable components, a maintenance-friendly actuator, and built-in leakage detection on all seals, uptime is maximized and operating costs are minimized. Use the Unique Mixproof Tank Outlet valve with Alfa Laval ThinkTop sensing and control units for optimal control of tank filling and emptying.
Product benefits
- Cost-effective and spillage-free
- Enhanced product safety
- Maximum yield and optimized efficiency
- Easy maintenance and cleanability
- Flexible installation options
Options
- Vertical or horizontal mounting
- Integration with Alfa Laval ThinkTop control units
- Configurable to meet hygienic or high purity needs
How it works
The Alfa Laval Unique Mixproof Tank Outlet is a double seat valve controlled remotely by compressed air. It is a normally closed (NC) valve with two independent plug seals, forming a leakage chamber at atmospheric pressure during all operating conditions. In the rare case of leakage, the fluid flows into the leakage chamber and is safely discharged through the outlet.
When the valve is open, the leakage chamber is closed, allowing product to flow from the tank to the pipeline without spillage. The valve can be cleaned to any hygienic or high purity level needed for the process. Its design ensures virtually no product loss during operation.
Unique Mixproof UltraPure
The Alfa Laval Unique Mixproof UltraPure valve is designed specifically to meet the stringent requirements of the pharmaceutical and biotech industries. It enables the simultaneous flow of two different fluids through the same valve without any risk of cross-contamination. Its modular design ensures maximum uptime for continuous, high-purity processes while delivering outstanding safety and flexibility.
The high-purity, double seat valve for continuous processes
This high-purity valve solution offers a non-spilling design, is easy to clean and maintain, and provides full component traceability. The modular configuration makes it easy to upgrade or customize, helping optimize plant efficiency without compromising product safety.
Product benefits
- Non-spilling solution
- Easy to clean and maintain
- Modular design for flexible configuration
- Easy to upgrade and integrate
- Full component traceability
Options
- 3-A version available upon request
- Product wetted seals: HNBR, NBR, EPDM or FPM
- Male parts or clamp liners per required standards
- Control and indication: ThinkTop or ThinkTop Basic
- Side indication for upper seat lift detection
The Alfa Laval Unique Mixproof UltraPure provides the highest level of safety and operational flexibility for your most demanding high-purity applications, ensuring optimized plant performance and product integrity.