Siemens Building Technology 285-05921 3-Inch 2-Way Normally Open Pneumatic Globe Valve Assembly Stainless Steel Trim

The Siemens Building Technology 285-05921 is a 3-inch, 2-way pneumatic globe valve assembly designed for precise flow control in commercial HVAC systems. This complete valve and actuator assembly pairs a stainless steel-trimmed globe valve (valve number 599-05921) with a pneumatic actuator for reliable, spring-return operation in chilled water, hot water, and steam applications.

Key Features:

• Pipe Size: 3 inches
• Valve Type: 2-Way Globe Valve
• Fail-Safe Position: Normally Open (N.O.) with spring return
• Trim Material: Stainless Steel (SS) for corrosion resistance and durability
• Cv Rating: 100 — suitable for high-flow HVAC applications
• Close-Off Pressure: 63 PSI
• Control Signal: Pneumatic (12-inch stroke actuator)
• Actuator Components: 599-01010 + 599-00423
• Connection Type: Flanged
• NEMA Rating: NEMA 1
• Power Supply: Pneumatic

The spring-return, normally open design ensures the valve defaults to the open position upon loss of pneumatic signal, providing a critical fail-safe for heating and cooling systems. The stainless steel trim construction offers enhanced resistance to corrosion and wear, making this assembly well-suited for demanding commercial building environments. The flanged connection simplifies installation and maintenance in larger piping systems.