Description
Crane DM931 Variable Orifice Double Regulating Valve (DRV) – Ductile Iron
Precision Flow Balancing Valve for Large HVAC Hydronic Systems
The Crane Fluid Systems DM931 Variable Orifice Double Regulating Valve (DRV) is a premium balancing valve specifically designed for commercial and industrial hydronic heating and chilled water systems. Manufactured from high-strength ductile iron, the DM931 combines flow regulation, flow measurement, and isolation in a single valve, making commissioning faster and improving long-term system efficiency. It is available in DN65 to DN300 with a PN16 pressure rating for medium and large pipework installations.
Key Features
- Variable Orifice Double Regulating Valve (DRV)
- Ductile iron Y-pattern globe valve construction
- Available in sizes DN65 to DN300
- PN16 pressure rating
- Flanged end connections
- Operating temperature: 10°C to 120°C
- Two integrated P84 pressure test points for accurate differential pressure measurement
- Provides isolation, balancing, and flow regulation within a single valve
- Handwheel with preset locking function allows reopening to the original balancing position after maintenance
- Designed in accordance with BS 7350 flow measurement methodology
Benefits
Accurate Hydronic Balancing
The DM931 enables precise balancing of heating and cooling water circuits by measuring differential pressure across the valve and adjusting the flow to the required design value. Accurate balancing minimizes energy consumption and ensures every terminal unit receives the correct flow rate.
Isolation Without Losing Valve Settings
Unlike conventional balancing valves, the DM931 incorporates a Double Regulating mechanism. After the system is commissioned, the valve can be completely closed for servicing and later reopened directly to its preset balancing position without requiring recommissioning.
Robust Construction
Its ductile iron body provides excellent mechanical strength and long service life, making the valve suitable for demanding HVAC applications including district cooling, commercial buildings, hospitals, airports, and industrial facilities.
Typical Applications
The Crane DM931 is commonly installed in:
- Commercial office buildings
- District heating and cooling systems
- Chilled water networks
- HVAC plant rooms
- Data centers
- Hospitals
- Universities
- Industrial cooling systems
- Injection circuits requiring double regulating valves
Technical Specifications
| Specification | Value |
|---|---|
| Model | DM931 |
| Valve Type | Variable Orifice Double Regulating Valve (DRV) |
| Body Material | Ductile Iron |
| Size Range | DN65 – DN300 |
| Pressure Rating | PN16 |
| Temperature Range | 10°C to 120°C |
| End Connection | Flanged |
| Flow Measurement | Differential Pressure Test Points (P84) |
| Flow Measurement Accuracy | ±10% at full open position |
| Typical Service | Heating & Chilled Water Systems |
Why Choose the Crane DM931?
The Crane DM931 is engineered for reliable hydraulic balancing in medium and large HVAC systems. By combining flow measurement, balancing, and isolation in one robust valve, it reduces installation complexity, shortens commissioning time, and helps maintain optimum energy efficiency throughout the life of the building. Its durable ductile iron construction and repeatable preset function make it a preferred solution for consultants, contractors, and facility managers seeking dependable system performance.
