Description
Crane DM941 Fixed Orifice Double Regulating Valve (FODRV) – Ductile Iron
High-Accuracy Fixed Orifice Balancing Valve for Commercial HVAC Systems
The Crane Fluid Systems DM941 Fixed Orifice Double Regulating Valve (FODRV) is a high-performance balancing valve designed for accurate flow measurement, regulation, and isolation in large hydronic heating and chilled water systems. Featuring an integral fixed orifice, the DM941 delivers superior flow measurement accuracy compared with variable orifice balancing valves, making system commissioning faster, easier, and more reliable. It is manufactured from durable ductile iron and available in DN65 to DN300 with PN16 flanged connections.
Key Features
- Fixed Orifice Double Regulating Valve (FODRV)
- Heavy-duty ductile iron body
- Available in DN65–DN300
- PN16 pressure rating
- Flanged connections to BS EN 1092-2
- Operating temperature: 10°C to 120°C
- Integral fixed orifice for highly accurate differential pressure measurement
- Double regulating function allows isolation while retaining preset balancing position
- Flow measurement accuracy of ±5% at all valve positions in accordance with BS 7350:1990
- Suitable for hydraulic balancing and commissioning applications
Benefits
Superior Flow Measurement Accuracy
Unlike variable orifice balancing valves, the DM941 incorporates a fixed integral orifice, providing highly repeatable and consistent differential pressure readings. This significantly improves balancing accuracy and simplifies system commissioning.
Preset Double Regulating Function
The valve can be completely closed for maintenance and reopened to its original preset position without requiring system rebalancing. This reduces maintenance time and minimizes system downtime.
Reliable Performance for Large Hydronic Networks
The robust ductile iron construction offers long service life in demanding HVAC applications while maintaining stable hydraulic performance under varying operating conditions.
Typical Applications
The Crane DM941 is ideal for:
- Commercial HVAC systems
- District heating and cooling
- Chilled water distribution
- Large office buildings
- Hospitals
- Data centers
- Universities
- Industrial process cooling
- Injection circuits requiring highly accurate hydraulic balancing
Technical Specifications
| Specification | Value |
|---|---|
| Model | DM941 |
| Valve Type | Fixed Orifice Double Regulating Valve (FODRV) |
| Body Material | Ductile Iron |
| Size Range | DN65–DN300 |
| Pressure Rating | PN16 |
| Temperature Range | 10°C to 120°C |
| End Connection | Flanged (BS EN 1092-2) |
| Flow Measurement Accuracy | ±5% at all valve positions |
| Flow Measurement Method | Integral Fixed Orifice |
| Standard | BS 7350:1990 |
| Typical Service | Heating & Chilled Water Systems |
Why Choose the Crane DM941?
The Crane DM941 combines accurate hydraulic balancing, flow measurement, and isolation in a single valve. Its integral fixed orifice provides greater measurement accuracy than variable orifice designs, resulting in faster commissioning, lower installation costs, and improved long-term energy efficiency. For engineers and facility managers seeking dependable balancing performance in medium and large HVAC systems, the DM941 is an excellent solution.
