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Conventional post-mix valves rely on mechanical components to regulate flow rates. They work, but they don’t learn, they don’t adapt, and they generate noise and drift over time. Dolphin Fluidics designs a new class of soda machine valve built on Shape Memory Alloy (SMA) technology: a proportional, electronically controlled actuator that delivers closed-loop precision without the mechanical limitations of traditional post-mix dispensing valves.
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Digisense valve
The Digisense valve adds integrated flowmeters and temperature probes to each of its two independent liquid channels, enabling fully autonomous closed-loop ratio control with no external instrumentation required. For soda fountain and post-mix applications where brix accuracy and temperature-controlled mixing are critical, the Digisense reduces external component count and enables real-time dispensing diagnostics.
- Two independent liquid channels | Operating pressure: 0–8 bar
- Integrated flowmeter per channel for closed-loop flow regulation
- Integrated temperature probes for temperature-controlled mixing
- Full-seal gasket — high hygiene design
- Communication: RS-485 | Operating voltage: 7.5–24 VDC or 24 VAC
Smart HP Liquid valve
The Smart HP Liquid valve provides single-channel proportional control optimized for liquids, including high-viscosity syrups and concentrates. Its compact form factor and low power consumption make it suitable for integration in space-constrained soda machine architectures where precise dosing of a single liquid stream is required.
- Single-channel proportional liquid control
- Operating pressure: 0–20 bar
- Compact design | OEM-optimized
- Communication: Analog, PWM, RS-485, I2C
- Operating voltage: 5–24 VDC
Smart AnT MS valve
The Smart AnT MS valve is a family of proportional valves with total separation for liquids and gases, available in normally closed 2/2-way and 3/2-way configurations. In post-mix soda dispensing, it handles CO2 or compressed-air circuits as well as liquid streams, with complete separation between the fluid path and the actuation electronics, ensuring hygiene standards required in food and beverage applications. Valves can be installed individually, in serial cascade, or on a manifold, supporting compact multi-flavor architectures.
- Total separation | Liquids, air, gas, and steam
- Operating pressure: –0.3 to 2, 6, or 12 bar (depending on configuration)
- Orifice diameter: 1–2.2 mm | Kv: 0.03–0.08
- Body: PPS, PPSU | Seal: EPDM or Silicone | Fluid temperature: up to 95 °C
- NSF, FDA and MOCA compliant
- Communication: Analog, PWM, I2C | Operating voltage: 5–24 VDC | Power: < 1 W
Technical specifications at a glance
| Model | Channels | Media | Pressure Range | Control Mode | Protocols |
|---|---|---|---|---|---|
| Digisense Valve | 2 | Liquid - Liquid | 0–8 bar | Proportional closed-loop | RS-485 |
| Smart HP Liquid Valve | 1 | Liquid | 0–20 bar | Proportional closed-loop | Analog, PWM, RS-485, I2C |
| Smart AnT Valve | 2 | Air/gas, Liquid | –0.3 to 2,6 bar | Proportional closed-loop | Analog, PWM, I2C |
Why upgrade your soda machine valve to SMA technology
Traditional mechanical post-mix dispensing valves have defined the beverage industry for decades. They are cost-effective at the unit level and simple to service. But they impose constraints that increasingly conflict with the precision, hygiene, and data requirements of modern soda fountain systems, from QSR chains to premium vending platforms.
Proportional control replaces fixed orifices
A standard post-mix valve regulates flow through fixed mechanical orifices calibrated for a specific pressure range. Variations in inlet pressure, temperature, or syrup viscosity introduce brix drift, meaning the drink coming out of the last valve on a 10-flavor manifold may taste different from the first. Dolphin Fluidics’ smart proportional valves adjust their opening position continuously in response to a control signal, maintaining the commanded syrup-to-water ratio regardless of upstream pressure variation.
Closed-loop control eliminates drift over time
Mechanical components wear. O-rings degrade. Spring tension changes. In conventional post-mix soda dispenser valves, this translates into flavor drift that accumulates between service intervals. Each Dolphin Fluidics valve integrates a 32-bit microprocessor running a closed-loop control algorithm on board: the valve measures its output against the setpoint and corrects in real time, with no recalibration requirement over its service life.
Up to 20x lower power consumption
Compared to conventional proportional solenoid valves, Dolphin Fluidics valves consume up to 20 times less energy. In high-channel-count soda dispensing systems, where multiple valves operate simultaneously, this translates into a significant reduction in thermal load and power draw, enabling more compact machine designs without active cooling.
Silent operation: no electromagnetic noise
SMA actuators contain no electromagnetic coil. There is no acoustic click on actuation, no vibration transmission to the dispenser body, and no electromagnetic interference with adjacent electronics. For premium soda machine applications where user experience and ambient noise are design constraints, silent valve operation is a functional requirement.
Full medium separation: NSF/FDA-compliant materials
All Dolphin Fluidics soda fountain valve designs feature a full-seal gasket that completely separates the fluid path from the actuation electronics. Materials are NSF and FDA compliant, meeting the hygiene requirements for direct food and beverage contact. There is no risk of fluid contamination of the control electronics across the valve’s operating life.
OEM customization from early design
Every dimension of a Dolphin Fluidics post-mix valve (port geometry, pressure range, flow characteristics, communication protocol, firmware, and materials) can be adapted to the requirements of a specific OEM soda dispenser platform. Dolphin Fluidics engages as a development partner from concept through volume production.
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Applications
Dolphin Fluidics smart post-mix and soda dispenser valves are designed for integration into OEM beverage equipment across a range of commercial formats:
| Application | Use case | Recommended models |
|---|---|---|
| QSR & Fast Food Fountain Systems | Multi-flavor post-mix dispensing, brix ratio accuracy, high-cycle durability | Digisense Valve |
| Vending Machines | Compact soda machine valve design, low power budget, autonomous closed-loop control | Smart AnT Valve |
| Premium Bar & Hospitality Equipment | Silent operation, precise carbonation control, brand-differentiated dispense experience | Smart HP Liquid Valve |
| Countertop Soft Drink Dispensers | Space-constrained integration, multi-channel mixing, hygienic design | Digisense Valve |
| Industrial Beverage Filling Lines | High-pressure liquid dosing, flow rate repeatability, production-line integration | Smart HP Liquid Valve |
Why choose Dolphin Fluidics as your soda dispenser valve manufacturer
Dolphin Fluidics is a specialist in smart fluid control technology, developing proportional valves for OEM applications in food and beverage, health tech, industrial automation, and agriculture. Our engineering team combines decades of expertise in fluidics and smart actuators with an OEM-first development philosophy.
For post-mix soda dispensing applications, this means: a valve that is designed to your system architecture, not adapted from a catalog. Custom port sizes, custom pressure ranges, custom brix control algorithms, custom communication interfaces — all supported within our standard OEM configuration process.
Our food and beverage valve range is validated for direct food and beverage contact, with NSF and FDA compliant materials across all product lines. Integration support is available from first concept through volume production ramp.
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Frequently asked questions
1. What is a post-mix valve, and how does it work?
A post-mix valve controls the simultaneous dispensing of syrup concentrate and still or carbonated water, mixing them at a precise ratio at the point of dispense. The valve regulates two fluid streams, typically syrup and water or CO2, so that the final beverage achieves the correct brix level (syrup concentration) and carbonation. In traditional soda dispenser valves, this mixing ratio is set mechanically through fixed orifices. In Dolphin Fluidics smart valves, it is managed electronically through closed-loop proportional control, enabling real-time correction and consistent output regardless of pressure or temperature variation.
2. What is the difference between a post-mix and a pre-mix soda system?
In a post-mix system, syrup and water are stored separately and mixed at the dispense point through the soda machine valve. In a pre-mix system, the beverage is fully blended before reaching the dispenser. Post-mix systems are more space-efficient for high-variety installations (multiple flavors from a compact unit). Most commercial soda fountains and QSR dispensing systems are post-mix.
3. Which Dolphin Fluidics valve is best suited for a post-mix soda dispenser?
For applications requiring integrated flow and temperature measurement for autonomous ratio control, the Digisense valve adds embedded sensors on both channels. For CO₂ or air circuit management, the Smart AnT valve provides separeted channels control. The best configuration depends on your system architecture, contact our engineering team to identify the optimal solution.
4. Are Dolphin Fluidics soda machine valves NSF/FDA compliant?
Yes. All Dolphin Fluidics valves for beverage applications are manufactured with NSF and FDA compliant materials, ensuring they meet the hygiene requirements for direct food and beverage contact. The full-seal gasket design maintains complete separation between the fluid path and the electronics, preventing contamination across the valve’s operating life.
5. Can Dolphin Fluidics valves be customized for a specific soda dispenser platform?
Yes. All dimensions, pressure ranges, flow characteristics, port geometries, firmware, and communication interfaces can be adapted to the requirements of a specific OEM dispensing system. Dolphin Fluidics engages as a development partner from early design through volume production, supporting both engineering teams and procurement functions throughout the project lifecycle.
6. What communication interfaces are available for integration into soda fountain control systems?
Depending on the model, Dolphin Fluidics post-mix valves support analog (0–10 V / 4–20 mA), PWM, RS-485, and I2C interfaces. Communication protocols can be customized as part of the OEM configuration process to match the control architecture of the host dispensing system.
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