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D4 Series Double Seat Mix Proof Valve

  • D4 Series Double Seat Mix Proof Valve and Manifold Images


  • D4 Series Double Seat Mix Proof Valve Cutaways


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  • D4 Series Double Seat Mix Proof Valve and Manifold Images
  • D4 Series Double Seat Mix Proof Valve Cutaways
  • D4 Valve Animation Video Icon
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Product Types:

mix proof valves, double seat valves

Offers reliable separation of fluids and an ultra-hygienic option for enhanced cleanability.
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Where to Buy

The next generation of mix proof valve technology is the result of continued development from both APV™ and Waukesha Cherry-Burrell™ process technologies. Used for the reliable separation of dissimilar fluids, the D4 Series helps fulfill today’s customer demands for production flexibility, increased productivity, rapid return on investment (ROI), and improved product quality across the Food & Beverage, Dairy, Personal Care and Brewing process industries.

High value, Low life cycle costs:
  • Tiered model range helps to increase ROI and align with customer budgets
  • “All In” standard features provide exceptional value
  • Reduced inventory costs with same seal kit used on multiple size ranges such as one kit for 1.5" - 3.0" sizes
  • Reduced CIP losses improve cost savings
  • Low air consumption and air supply requirements
  • Long housing ports ease manifold building
  • Integrated shaft seal flush reduces need for external piping
  • Replacement insert available to easily upgrade existing installations

Reliable performance:
  • Fully balanced design helps to prevent hydraulic blocking, withstand pressure spikes, and enables flexible flow direction without slamming
  • Light overall weight helps support handling without lifting tools
  • Slim stainless actuator is fully enclosed to prevent fluid ingress
  • Range of control units and bus communication for automated operation
  • No compressed air needed for removal and servicing

  • Designed to the latest hygienic standards
  • Standard cavity spray cleaning
  • Extensive cleaning of product contact seals

3A Certification Logo


Valve TypeFeatureBenefit
D41Radial seal design for reduced losses of product fluids during switching
  • Product cost savings
  • Cleaner operating environment
DA42Integrated upper and lower shaft seal and balancer flushing
  • Extensive cleaning of product contact surfaces
  • Extensive cleaning of product contact surfaces
DA43Metal orifices control CIP flow during seat liftReduces chemical and water loss consumption
D4 and DA44Open yoke design
  • Reduces heat transfer from product zone into actuator
  • Provides visual leak detection of damaged shaft seals
  • Safety guard provided to reduce pinch points
 5Bolted flange connection for housing/insert
  • Heavy duty, secure connection
  • Reliable and controlled assembly and disassembly of valve insert
 6Long ports to ease manifold buildingHelps to reduce spool pieces and welds to ease manifold building
 7Balanced upper and lower shafts (as standard)
  • No hydraulic blocking
  • Resistant against pressure spikes
  • Flexibility in either flow direction through the valve (top-to-bottom or bottom-to-top) without water hammering
 8Large separation cavity drain portLess product risk and guards against pressure build up which could cause cross-contamination.
 9Flush cavity spray fixed connection (as standard)
  • Enhanced cleaning
  • Removes residual media in separation cavity when full CIP is not readily available
  • Hard-piped flush can be used without need to be removed during valve maintenance

Double seat mix proof valves are used to efficiently process two different fluids (typically product and CIP) through the valve simultaneously. The mix proof design has two seats which isolate the upper and lower pipe lines when the valve is in the fail-safe closed position. The atmospheric vent cavity in between the seats creates a path for any leakage should the seals fail as well as a drain for CIP solution during seat cleaning. An external CIP spray flush is included to provide enhanced cleaning of the leakage and vent cavity while the valve is closed or open during production.

Valve Closed

Optional Lower Seat Clean

Valve Open

Optional Upper Seat Clean



Dimensions inchAA1BøDiøDaFHLL1X*Y*

*Minimum installation and valve insert removal dimensions

NOTE: Add the following approximate dimension to “F” for each clamp port connection 0.5" for valve sizes 1.5" - 3.0", 0.62" for valve size 4".



Dimensions inchAA1BøDiøDaFHLL1X*Y*

*Minimum installation and valve insert removal dimensions

NOTE: Add the following approximate dimension to “F” for each clamp port connection 0.5" for valve sizes 1.5" - 3.0", 0.62" for valve size 4".



Dimensions inchAA1BøDiøDaFHLL1X*Y*

*Minimum installation and valve insert removal dimensions

NOTE: Add the following approximate dimension to “F” for each clamp port connection 0.5" for valve sizes 1.5" - 3.0", 0.62" for valve size 4".

Housing Combinations

Shut-off Valves


Control Units

APV_D4_control_unit_optionsCU4 Series

Features and Benefits

  • Automated control and position monitoring for reliable processing
  • Reduces compressed air and electrical connections
  • Helps reduce external solenoid valve cabinets
  • Accelerates valve response time
  • Reliability and long service life - robust clamp connection, reinforced stainless steel air coupling threads to avoid air leakages, and water tight seals
  • Ease of operation - contains manual override solenoids and adjustment screw to throttle air flow to actuator to ensure optimal opening and closing
  • Clarity - clear and bright indication of valve position - 5 diodes in LED panel and convenient location
  • Standardization - same control top used on various SPX FLOW valve lines, offers common look and controls interface
  • NEMA 6 (IP67) washdown rating


  • S/O Cord Grip for hard wire (std)
  • M12 4-pin connector (optional)


  • 2 internal feedback sensors for valve open/valve closed position detection


  • 24V DC Direct Connect
  • AS-i Field Bus Card


  • 24V DC
  • Select 1 (non seat lift) or 3 Solenoids (seat lift)

D4 Series Hygienic Double Seat Mix Proof Valve Animation


Press Release

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