Siemens 373-03184 Normally Closed Valve Assembly with Actuator HVAC Control Valves & Actuators - 2-Way 3/4 SAX81.03U

The Siemens 373-03184 is a complete valve and actuator assembly designed for precise control of water flow in HVAC and building automation systems. This pre-assembled unit combines a 2-way normally closed bronze globe valve with a SAX81.03U electronic actuator, eliminating the need for field assembly and ensuring optimal compatibility.

Valve Specifications:

• 2-way normally closed (NC) configuration
• 3/4-inch female x female (FxF) threaded connections
• 6.3 Cv flow coefficient
• Equal percentage flow characteristic
• Bronze body with brass trim construction
• Designed for use with chilled or hot water systems

SAX81.03U Actuator Features:

• 24 Vac power supply requirement
• Floating 3-position control signal
• Non-spring return (fail-in-place) operation
• 180 lb (800N) nominal actuating force
• 30-second runtime for full stroke
• Direct-coupled installation with no special tools required
• Manual override with visual position indication
• UL listed for plenum installations
• IP54 degree of protection
• 5-9 VA power consumption

This valve assembly is part of the Siemens Flowrite 599 Series and is ideal for hydronic heating and cooling applications where precise flow control is required. The normally closed design ensures the valve closes when power is removed, providing fail-safe operation for many HVAC applications. The equal percentage flow characteristic provides excellent control at partial load conditions, making it well-suited for variable flow systems.