Description
Crane DA931 Variable Orifice Double Regulating Valve (VODRV) – Ductile Iron
Heavy-Duty Balancing Valve for Large HVAC and Industrial Hydronic Systems
The Crane Fluid Systems DA931 Variable Orifice Double Regulating Valve (VODRV) is a high-performance balancing valve designed for accurate flow regulation, flow measurement, and isolation in medium and large hydronic systems. Manufactured from ductile iron with ANSI Class 125 flanged connections, the DA931 is ideally suited for commercial buildings, district cooling, district heating, and industrial process water applications.
Its Y-pattern globe valve design incorporates two P84 pressure test points, allowing engineers to accurately measure differential pressure and calculate system flow during commissioning. The double regulating mechanism enables the valve to be closed for maintenance and then reopened to its original preset position, eliminating the need for system rebalancing.
Key Features
- Variable Orifice Double Regulating Valve (VODRV)
- Ductile Iron body construction
- Available sizes DN65 – DN300 (2½” – 12″)
- ANSI Class 125 flanged connections
- Pressure rating: Class 125
- Operating temperature: 10°C to 120°C
- Integral P84 pressure test points
- Double regulating handwheel with preset memory
- Flow measurement accuracy of ±10% at the fully open position
- Suitable for balancing large HVAC and industrial piping systems
- BIM, CAD and commissioning documentation available.
Key Benefits
Accurate System Balancing
The DA931 enables engineers to measure differential pressure across the valve, allowing accurate flow balancing throughout chilled water and heating systems.
Preset Position Memory
Once commissioned, the valve can be closed for maintenance and reopened to exactly the same balancing position, reducing downtime and eliminating the need for recommissioning.
Rugged Construction
The ductile iron body provides excellent mechanical strength for larger pipe sizes while offering long service life in demanding HVAC and industrial environments.
Simplified Maintenance
Integrated pressure test points make routine system verification quick and convenient without removing the valve from the pipeline.
Typical Applications
The DA931 is commonly installed in:
- Commercial office buildings
- Hospitals
- Hotels
- Airports
- Shopping centres
- District heating systems
- District cooling systems
- Industrial process cooling
- Central plant rooms
- Large chilled water distribution networks
- Data centres and utility buildings.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product | DA931 Variable Orifice Double Regulating Valve |
| Valve Type | Variable Orifice Double Regulating Valve (VODRV) |
| Material | Ductile Iron |
| Size Range | DN65 – DN300 |
| Pressure Rating | ANSI Class 125 |
| Temperature Range | 10°C to 120°C |
| Connection | ANSI Class 125 Flanged |
| Flow Measurement Accuracy | ±10% (fully open) |
| Pressure Test Points | P84 Test Points |
Why Choose the Crane DA931?
The Crane DA931 is engineered for medium and large diameter hydronic systems where precise balancing, reliable isolation, and repeatable commissioning are essential. Its combination of a rugged ductile iron body, Y-pattern globe design, and integrated flow measurement capability makes it an excellent choice for high-capacity HVAC installations.
Compared with conventional isolation valves, the DA931 combines flow regulation, flow measurement, and isolation in a single valve, reducing installation complexity while improving commissioning efficiency and long-term system performance.
