Description
Overview
The Utica-Dunkirk 28391 is a complete 2-way normally open valve assembly engineered for reliable flow control in commercial and industrial HVAC hydronic systems. Combining a precision-machined bronze body valve with an integrated spring return pneumatic actuator, this assembly delivers dependable, fail-safe operation and long service life in demanding applications.
Key Features
- 2-way, normally open (N/O) configuration for fail-safe flow control
- 3/4″ NPT x union end connections for straightforward installation and serviceability
- 5.5 Cv flow coefficient for accurate and efficient flow regulation
- Equal percentage flow characteristic for precise modulating control across the full valve stroke
- Bronze body construction for excellent corrosion resistance and durability
- Brass trim components for long-lasting, reliable sealing performance
- Spring return pneumatic actuator with 5–10 PSI operating range ensures automatic fail-safe return to the normally open position on air loss
Valve Specifications
- Valve Type: 2-Way, Normally Open
- Connection Size: 3/4″
- Connection Type: NPT x Union
- Flow Coefficient (Cv): 5.5
- Flow Characteristic: Equal Percentage
- Body Material: Bronze
- Trim Material: Brass
Actuator Specifications
- Actuator Type: Spring Return Pneumatic
- Operating Pressure Range: 5–10 PSI
- Fail-Safe Action: Spring return to normally open position on loss of air signal
Applications
- Commercial and industrial hydronic heating and cooling systems
- Pneumatically controlled air handling units and fan coil units
- Building automation and energy management systems requiring modulating valve control
- Systems where fail-safe normally open operation is required on loss of control signal
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