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
Enables continuous processing of different fluids with reliable separation
Suited for high-productivity environments with demanding hygienic standards
“All In” standard features improve ROI and simplify specification
One seal kit fits multiple valve sizes (e.g., 1.5″–3.0″), reducing inventory needs
Compatible with legacy dimensions for retrofit or complex piping layouts
Low Operating Costs
Reduced CIP losses lower utility costs
Minimal air consumption and low-pressure air requirements
Long housing ports simplify manifold design
Integrated shaft seal flush reduces external piping complexity
Robust & Reliable Design
Fully balanced valve to resist pressure spikes and hydraulic blocking
Operates with flexible flow direction and no valve slam
Slim, lightweight stainless-steel actuator requires no lifting tools
Completely enclosed actuator prevents fluid ingress
No compressed air required for valve removal or servicing
Hygienic Excellence
Designed to meet 3-A Sanitary Standard 85-02 for PMO compliance
Product-contact surfaces are fully cleanable without full valve actuation
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:
Product 1 = Dark Blue/Purple
Product 2 = Red
CIP = Light Blue Turquoise
Valve Closed
| Lower Seat Clean
|
Valve Open
| Upper Seat Clean
|
Typical Applications
Fluid milk
Raw milk
Skimmed milk
Milk concentrate
Cheese
Cream
Whey
Yogurt
Raw receiving
Supply and discharge on HTST pasteurization
Filler supply lines
Batching/blending distribution
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:
Integrated seat lift detection without external wiring
High reliability due to reinforced stainless steel air connections and watertight seals
Manual override solenoids and an adjustable air flow screw for fine-tuned actuation control
Clear and bright LED panel with five diodes for instant position feedback
Unified control top used across multiple SPX FLOW valve lines for a consistent look and feel
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:
Contact-free position sensors with three programmable feedback signals
Intuitive push-button teaching or Autotune function for fast setup
360° ultra-bright LED ring with customizable red, yellow, and green light assignments
Manual override solenoids with adjustable air throttling for optimized actuation
IP69K washdown capability (standard IP65/IP67) for high-sanitation environments
Built-in cycle counter and maintenance alert system
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 |