Siemens Building Technology 257-02013B 3/4" Normally Closed Control Valve 3-8 PSI 6.3 Cv

The Siemens Building Technology 257-02013B is a 3/4-inch normally closed (N/C) spring return control valve designed for HVAC heating and cooling applications. This valve operates on a 3-8 PSI control signal and features a 6.3 Cv (flow coefficient) rating for precise fluid control.

Key Specifications:

• Connection size: 3/4-inch female threaded connections
• Valve position: Normally closed (N/C) - closes on loss of air pressure
• Actuator type: Spring return pneumatic actuator
• Operating pressure range: 3-8 PSI
• Flow coefficient (Cv): 6.3
• End connections: Female x Union (FXUM) configuration

This control valve is ideal for commercial building automation systems where fail-safe normally closed operation is required. The spring return actuator ensures the valve automatically returns to the closed position during power failure or loss of air signal, providing reliable safety shutoff for heating or cooling water systems.