Siemens 259-02055 2-Way Normally Open Valve Actuator Assembly 1/2 Inch 2.5 Cv

The Siemens 259-02055 is a Powermite 599 MT Series 2-way normally open valve actuator assembly designed for terminal unit applications in HVAC systems. This complete assembly features a 1/2-inch valve with female NPT x female NPT connection and 2.5 Cv flow capacity, equipped with stainless steel trim for corrosion resistance.

Key Features:

• 2-way normally open configuration with stainless steel trim
• Non-spring return electronic actuator with floating control signal
• 24 VAC operating voltage
• Female NPT x female NPT end connections
• 2.5 Cv flow coefficient
• Operating pressure range: 3 to 8 psi (21 to 55 kPa)
• ANSI 250 body rating with 65 psi rated close-off
• Medium temperature range: 35 to 226°F
• 125-second run time with 67 in-lb torque
• Fail-in-place operation for power loss situations

This assembly combines the 599-02055 valve with the SSC81U electronic actuator, providing reliable control for hydronic heating and cooling applications. The normally open design ensures flow continues during power failure, making it ideal for safety-critical terminal unit control applications.