APV / SPX Hygienic Valves
D4PMO Series – Double Seat Mixproof Valves APV SPX
D4PMO Series – Double Seat Mixproof Valves APV SPX
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Product Type:
Mixproof Valves
Description
The D4PMO Series is a next-generation mixproof valve solution designed to ensure safe separation of dissimilar fluids—particularly in Grade A dairy applications. Engineered to deliver maximum plant uptime, flexible production scheduling, and efficient cleanability, it is ideal for fluid milk, cheese, cream, whey, and yogurt processing.
Key Features & Benefits
High Performance & Flexibility
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Enables continuous processing of different fluids with reliable separation
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Suited for high-productivity environments with demanding hygienic standards
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“All In” standard features improve ROI and simplify specification
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One seal kit fits multiple valve sizes (e.g., 1.5″–3.0″), reducing inventory needs
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Compatible with legacy dimensions for retrofit or complex piping layouts
Low Operating Costs
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Reduced CIP losses lower utility costs
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Minimal air consumption and low-pressure air requirements
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Long housing ports simplify manifold design
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Integrated shaft seal flush reduces external piping complexity
Robust & Reliable Design
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Fully balanced valve to resist pressure spikes and hydraulic blocking
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Operates with flexible flow direction and no valve slam
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Slim, lightweight stainless-steel actuator requires no lifting tools
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Completely enclosed actuator prevents fluid ingress
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No compressed air required for valve removal or servicing
Hygienic Excellence
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Designed to meet 3-A Sanitary Standard 85-02 for PMO compliance
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Product-contact surfaces are fully cleanable without full valve actuation
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Integrated flow paths clean the upper balancer during seat lift — no external adapters needed
Theory of Operation
Double seat mixproof valves are designed to enable the safe and simultaneous flow of two different fluids—typically product and CIP—while preventing any risk of cross-contamination. In the fail-safe closed position, the D4PMO valve’s two seats isolate the upper and lower pipelines.
A vented atmospheric cavity between the seats provides dual protection: it acts as a drain in case of seal failure and removes CIP fluid during cleaning cycles. During seat lift movement, integrated flow paths allow CIP to clean exposed product-contact surfaces, including the upper balancer—no external adapters or piping are required. This ensures reliable hygienic separation and efficient CIP performance.
Flow Legend:
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Product 1 = Dark Blue/Purple
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Product 2 = Red
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CIP = Light Blue Turquoise
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Valve Closed
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Lower Seat Clean
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Valve Open
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Upper Seat Clean
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Typical Applications
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Fluid milk
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Raw milk
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Skimmed milk
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Milk concentrate
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Cheese
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Cream
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Whey
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Yogurt
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Raw receiving
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Supply and discharge on HTST pasteurization
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Filler supply lines
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Batching/blending distribution
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CIP supply and return distribution
Product Specifications
Main Dimensions (inches)
| Size (in) | A | A1 | B | øDa | øDi | F | H | L | L1 |
|---|---|---|---|---|---|---|---|---|---|
| 1.5 | 25.6 | 28.1 | 4.7 | 1.5 | 1.4 | 4.9 | 2.5 | 32.7 | 35.2 |
| 2.0 | 25.8 | 28.3 | 4.9 | 2.0 | 1.9 | 4.9 | 3.0 | 33.6 | 36.1 |
| 2.5 | 25.9 | 28.4 | 5.2 | 2.5 | 2.4 | 4.9 | 3.4 | 34.5 | 37.0 |
| 3.0 | 26.2 | 28.7 | 5.4 | 3.0 | 2.4 | 4.9 | 3.9 | 35.4 | 37.9 |
| 4.0 | 30.8 | 33.3 | 6.1 | 4.0 | 3.8 | 5.6 | 4.9 | 41.4 | 43.9 |
Minimum Installation Clearance
| Size (in) | P (above valve) | Q (below valve) |
|---|---|---|
| 1.5 | 34.3 | 7.8 |
| 2.0 | 34.6 | 8.5 |
| 2.5 | 35.0 | 9.2 |
| 3.0 | 35.4 | 9.9 |
| 4.0 | 39.0 | 11.9 |
- Note: Add to F dimension approximately:
– 0.5″ for valve sizes 1.5″–3.0″
– 0.62″ for valve size 4.0″ (clamp port connections)
Housing Combinations
Shut-off Valves
Control Units
The D4PMO valve series is compatible with two advanced control units — CU4plus and 8681 — designed to provide precise monitoring, ease of maintenance, and optimal performance in hygienic processing environments.
CU4plus Series
The CU4plus control unit integrates all essential monitoring and control functions into one compact unit without the need for external sensors. It offers:
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Integrated seat lift detection without external wiring
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High reliability due to reinforced stainless steel air connections and watertight seals
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Manual override solenoids and an adjustable air flow screw for fine-tuned actuation control
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Clear and bright LED panel with five diodes for instant position feedback
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Unified control top used across multiple SPX FLOW valve lines for a consistent look and feel
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Washdown protection rated NEMA6/IP67/IP69K*
Technical Specifications:
| Feature | Options / Values |
|---|---|
| Connector Options | S/O Cord Grip for hard wiring (standard) M12 4-pin connector (optional) |
| Position Indication | Automatic teaching of all valve positions Detects open, closed, upper/lower seat lifts |
| Interface Options | AS-i Field Bus Card |
| Solenoid Valves | Up to 3 solenoids (for seat lift control) |
8681 Control Unit
The 8681 control unit is developed by Bürkert Fluid Controls and delivers advanced feedback and automation capabilities. It features:
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Contact-free position sensors with three programmable feedback signals
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Intuitive push-button teaching or Autotune function for fast setup
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360° ultra-bright LED ring with customizable red, yellow, and green light assignments
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Manual override solenoids with adjustable air throttling for optimized actuation
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IP69K washdown capability (standard IP65/IP67) for high-sanitation environments
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Built-in cycle counter and maintenance alert system
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Durable stainless-steel adapter and chemically resistant polycarbonate head
Technical Specifications:
| Feature | Options / Values |
|---|---|
| Connector Options | Quick Disconnect Pin Connector |
| Position Indication | 3 programmable position sensors within the control top |
| Interface Options | AS-i Field Bus Card DeviceNet™ Field Bus Card |
| Solenoid Valves | 24V DC Manual override and air throttle adjustment Up to 3 solenoids integrated |