Description
Siemens Building Technology 599-04321-2.5 Pressure Independent Control Valve
The Siemens Building Technology 599-04321-2.5 is a 1/2″ Pressure Independent Control Valve (PICV) rated at 2.5 GPM in a Normally Open (NO) configuration. Designed for commercial and light industrial hydronic HVAC systems, this valve integrates flow limiting and control functions into a single compact body — eliminating the need for separate balancing valves and simplifying hydronic system design.
What Is a PICV?
A Pressure Independent Control Valve (PICV) combines three functions in one: a differential pressure regulator, a flow-limiting device, and a modulating control valve. Regardless of system pressure fluctuations, the PICV maintains a consistent, pre-set maximum flow rate, ensuring accurate zone control and eliminating the need for manual balancing across the system.
Key Features
- 1/2″ pipe connection size for compact terminal unit and coil applications
- Pre-set maximum flow rate of 2.5 GPM for reliable hydronic balancing
- Normally Open (NO) valve configuration — opens on loss of power for fail-safe operation
- Pressure independent design maintains consistent flow regardless of system pressure variations
- Combines differential pressure regulation, flow limiting, and modulating control in a single valve body
- Eliminates the need for separate manual balancing valves
- Designed for use with compatible Siemens actuators
- Suitable for chilled water and hot water hydronic HVAC applications
- Compact form factor ideal for fan coil units, air handling units, and terminal equipment
Application
The 599-04321-2.5 is well-suited for commercial HVAC hydronic systems where precise flow control and system balance are critical. It is commonly used in fan coil unit installations, variable flow hydronic systems, and building automation environments where Siemens controls infrastructure is already in place. The normally open configuration ensures continued flow in the event of actuator power loss, making it appropriate for heating-critical applications.
Specifications
- Brand: Siemens Building Technology
- Model / SKU: 599-04321-2.5
- Valve Type: Pressure Independent Control Valve (PICV)
- Connection Size: 1/2″
- Maximum Flow Rate: 2.5 GPM
- Fail Position: Normally Open (NO)
- Application: Chilled water / hot water hydronic HVAC systems
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