The Belimo EV300SU-180-250+ARX24-EV is a 2-way 3" pressure independent characterized control valve (PI-CCV) with integrated thermal energy metering, rated 180 GPM nominal flow, driven by a non fail-safe ARX24-EV actuator. It combines a characterized control valve, an ultrasonic flow sensor, supply and return temperature sensors and a communicating actuator in one assembly, so a single device controls flow, measures delivered energy and reports coil performance over BACnet, Modbus or MP-Bus.
Specifications sourced from belimo_EV300SU-180-250_ARX24-EV_datasheet_en-us.pdf (Belimo exact assembly datasheet, rev 2024-08-28). Verified 2026-08-21.
Common Applications
- Plant headers and primary or secondary distribution mains
- District energy and plate heat exchanger interfaces, where returning low delta T carries a thermal inefficiency charge
- Large air handling unit coils - Belimo's own AHU case study runs a single 60-ton unit at 240, 144 and 96 GPM depending on control mode
- Branch and riser monitoring on large distributed systems, where energy per branch is logged and alarmed
- Chiller and heat pump performance monitoring - Belimo positions the valve here for transparency on flow and delta T, and specifically does not recommend correcting delta T at the plant, since that can starve individual units
- Applications requiring measured delivered energy, not just valve position
- Low Delta T monitoring and diagnosis at the plant, with remediation applied at the downstream heat exchangers
These are documented Belimo Energy Valve application families, not a manufacturer recommendation for this specific model. This valve is an EV3-generation product, on which design flow (V'max) is adjustable across 30-100% of its 180 GPM nominal flow, giving a selectable range of 54.0 to 180.0 GPM. Any application below is suitable only where the required design flow falls inside that range. Source: belimo_Modbus-Register_Energy-Valve_V3_en-gb.pdf, V'max register range; nominal flow from the exact-model datasheet.
Warranty
Belimo 5-Year Limited Warranty. Coverage is subject to Belimo's applicable Terms and Conditions of Sale and to any product-specific warranty requirements. See Section IX of the Belimo Energy Valve technical documentation for the full terms.
Key Features
Measures delivered energy
An ultrasonic flow sensor plus supply and return temperature sensors compute actual thermal energy through the coil, so the valve reports BTU delivered rather than inferred position.
Pressure independent control
The characterized control valve holds the commanded flow across the stated differential pressure range, so balancing valves and repeat commissioning are not required.
Manages Delta T
Belimo Delta T Manager logic limits flow when the coil is not producing useful temperature difference, addressing Low Delta T Syndrome and reducing pumping energy.
Native BACnet, Modbus and MP-Bus
Communication is integral to the actuator: BACnet/IP, BACnet MS/TP, Modbus TCP, Modbus RTU and MP-Bus are supported directly, with no separate protocol gateway.
Technical Specifications
| Valve Pattern | 2-way |
| Valve Size | 3" [80] |
| Nominal Flow (V′nom) | 180 GPM |
| Body Pressure Rating | ANSI Class 250, standard class B |
| Close-off Pressure ∆ps | 310 psi |
| Differential Pressure Range | 5...50 psi or 1...50 psi see flow reductions chart |
| Flow Characteristic | equal percentage or linear |
| Fluid | chilled or hot water, up to 60% glycol max (open loop/steam not allowed) |
| Fluid Temperature | 14...250°F [-10...120°C] |
| Pipe Connection | Flange / for use with ASME/ANSI class 250 |
| Flow Measurement Accuracy | ±2%* |
| Flow Repeatability | ±0.5% (Flow) |
| Flow Sensor Technology | Ultrasonic with glycol and temperature |
| Nominal Voltage | AC/DC 24 V |
| Voltage Range | AC 19.2...28.8 V / DC 21.6...28.8 V |
| Power Consumption (Running) | 7 W |
| Transformer Sizing | 11 VA |
| Communicative Control | BACnet/IP, BACnet MS/TP Modbus TCP, Modbus RTU MP-Bus Cloud |
| Control Signal Y | 2...10 V |
| Position Feedback U | 2...10 V |
| Running Time (Motor) | 90 s |
| Control Accuracy | ±5% |
| Min. Controllable Flow | 1% of V'nom |
| Manual Override | external push button |
| Servicing | maintenance-free |
| Degree of Protection NEMA/UL | NEMA 1 |
| Degree of Protection IEC/EN | IP54 |
| Ambient Temperature | -22...122°F [-30...50°C] |
| Ambient Humidity | Max. 95% RH, non-condensing |
| Storage Temperature | -40...176°F [-40...80°C] |
| Valve Body Material | Cast iron - GG 25 |
| Stem | stainless steel |
| Seat | PTFE |
| Characterized Disc | stainless steel |
| Ball | stainless steel |
| O-ring | Viton |
Documentation
Related Products
Frequently Asked Questions
What is the nominal flow rate of the Belimo EV300SU-180-250+ARX24-EV?
The EV300SU-180-250+ARX24-EV is rated 180 GPM nominal flow (V′nom) at a valve size of 3".
Does the Belimo EV300SU-180-250+ARX24-EV support BACnet natively?
Yes. BACnet/IP and BACnet MS/TP are integral to the actuator, alongside Modbus TCP, Modbus RTU and MP-Bus. No external protocol gateway is required.
What enclosure rating does the Belimo EV300SU-180-250+ARX24-EV carry?
NEMA 1. The IEC/EN rating is IP54.
Is the Belimo EV300SU-180-250+ARX24-EV fail-safe?
No. This model uses a non fail-safe actuator and holds its last position on loss of supply power. Specify a fail-safe actuator variant if the circuit must drive to a defined position.
Belimo 5-Year Limited Warranty. Coverage is subject to Belimo's applicable Terms and Conditions of Sale and to any product-specific warranty requirements. See Section IX of the Belimo Energy Valve technical documentation for the full terms.
- Type:
- Energy Valve (PI-CCV)
- Valve Pattern:
- 2-Way
- Valve Size:
- 3 Inch
- GPM:
- 180
- Actuator Type:
- Non Fail-Safe
- Actuator Model:
- ARX24-EV
- Voltage:
- 24VAC/DC
- Communication:
- BACnet/Modbus/MP-Bus
- NEMA 4/4X:
- No
- Connection Type:
- Flanged
