Siemens Building Technology 281-05992 4-Inch Normally Closed Flanged Control Valve with Pneumatic Actuator

The Siemens Building Technology 281-05992 is a complete 2-way normally closed control valve assembly designed for commercial HVAC applications. This Flowrite Series assembly combines a 4-inch flanged bronze valve body with a 12-inch pneumatic actuator for reliable flow control in heating and cooling systems.

Key Features:

• 4-inch ANSI Class 125 flanged connection for easy installation
• Normally closed (N.C.) configuration - valve closes on air failure for safety
• 160 Cv flow coefficient for high-capacity applications
• Equal percentage flow characteristic for precise control
• Bronze trim construction rated for 125 PSI operation
• 12-inch pneumatic actuator with 1-1/2 inch stroke length
• 5 PSI span for standard pneumatic control systems
• Operating temperature range: -4°F to 386°F (-20°C to 197°C)
• Enclosed actuator housing protects internal components

This valve assembly is ideal for controlling hot or chilled water flow in commercial buildings, hydronic heating systems, and process cooling applications. The normally closed action ensures the valve returns to the closed position during power or air supply failure, providing fail-safe protection. Part number 281-05992 consists of valve body 599-05992 paired with actuator 599-01000.