Description
Crane D931 Fixed Orifice Double Regulating Valve (FODRV) – Bronze
Precision Balancing Valve for HVAC Hydronic Systems
The Crane Fluid Systems D931 Fixed Orifice Double Regulating Valve (FODRV) is a premium balancing valve engineered for accurate flow regulation, measurement, and isolation in closed-loop heating and chilled water systems. Featuring an integral fixed orifice, the D931 delivers ±5% flow measurement accuracy across all valve settings, making commissioning faster, more reliable, and more cost-effective than conventional balancing valves.
Manufactured from high-quality bronze, the D931 combines excellent corrosion resistance with long service life. Its robust Y-pattern body and Microset handwheel provide precise adjustment while maintaining stable hydraulic performance in commercial and industrial HVAC installations.
Key Features
- Fixed Orifice Double Regulating Valve (FODRV)
- Sizes available from DN15 to DN50 (½” to 2″)
- Pressure rating: PN25
- Temperature range: −10°C to +120°C
- High-quality bronze body construction
- Integral square-edged fixed orifice for accurate flow measurement
- Flow measurement accuracy of ±5%
- Built-in P84 pressure test points
- Microset handwheel with numerical position indicator
- WRAS Approved
- BIM and CAD files available for engineering projects.
Key Benefits
Accurate Hydraulic Balancing
The integral fixed orifice enables precise differential pressure measurement, allowing engineers to commission HVAC systems quickly while ensuring every circuit receives the correct design flow.
Three Functions in One Valve
The D931 combines:
- Flow regulation
- Flow measurement
- Isolation
into one compact valve, reducing the number of fittings required and simplifying installation.
Lower Installation Costs
Because the valve incorporates the measuring orifice within the body, fewer joints and accessories are required compared with traditional balancing solutions. This reduces installation time and minimizes potential leakage points.
Long Service Life
The bronze construction provides excellent resistance to corrosion and wear, ensuring reliable operation throughout the life of the HVAC system.
Typical Applications
The Crane D931 is ideal for:
- Commercial office buildings
- Hospitals
- Hotels
- Data centres
- Universities
- District heating systems
- Chilled water networks
- Industrial HVAC systems
- Fan Coil Unit (FCU) circuits
- Air Handling Unit (AHU) circuits.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product | D931 Fixed Orifice Double Regulating Valve |
| Material | Bronze |
| Valve Type | Fixed Orifice Double Regulating Valve (FODRV) |
| Size Range | DN15 – DN50 |
| Pressure Rating | PN25 |
| Temperature Range | -10°C to +120°C |
| Flow Accuracy | ±5% |
| Test Points | P84 Pressure Test Points |
| Connection | Threaded (Parallel & Taper depending on size) |
| Approval | WRAS |
Why Choose the Crane D931?
The D931 is designed to improve commissioning efficiency while delivering highly accurate and repeatable flow measurements. Compared with conventional variable-orifice balancing valves, its fixed-orifice design provides better accuracy, easier setup, and fewer installation components.
For consulting engineers, contractors, and facility managers seeking dependable hydronic balancing solutions, the Crane D931 offers an excellent combination of precision, durability, and ease of maintenance.
