Siemens Building Technology 373-03133 Normally Closed Valve Assembly with Actuator HVAC Control Valves & Actuators - 2-Way SAX81.03U

The Siemens 373-03133 is a 2-way normally closed (N/C) control valve assembly designed for commercial HVAC and building automation systems. This Flowrite 599 Series valve features a robust bronze body with stainless steel trim for superior corrosion resistance and long-term durability in demanding applications.

Key Specifications:

• Valve size: 1-1/2 inch (40mm) female NPT threaded connections
• Flow coefficient: 25 Cv (22 Kvs)
• Equal percentage flow characteristic for precise control
• Stainless steel trim with standard packing
• ANSI Class 250 pressure rating
• 2-way normally closed operation

SAX81.03U Electronic Actuator Features:

• 24 VAC power supply requirement
• Non-spring return (NSR) floating control
• 3-position control with 30-second timing
• 180 in-lb torque output
• 8 VA power consumption
• Direct-coupled mounting to valve

This complete valve and actuator assembly provides reliable control of water and glycol solutions up to 50% concentration in heating, cooling, and hydronic systems. The stainless steel construction ensures excellent resistance to corrosion and scaling, making it ideal for applications with challenging water quality or where long service life is critical.