Schneider Electric (Barber Colman) VK-7221-203-4-8 Pneumatic Globe Valve 2-Way Normally Closed 1" Union 8-13 PSI

The Schneider Electric (Barber Colman) VK-7221-203-4-8 is a 2-way, normally closed pneumatic globe valve assembly designed for precise flow control of water and steam in commercial HVAC and hydronic systems. Featuring a 1-inch union end connection and an 8–13 PSI spring range, this valve fails to the closed position when supply air is removed, making it ideal for applications requiring a safe shutoff on loss of signal.

Part of the VB-7221 series, this assembly pairs a bronze globe valve body with a spring-return pneumatic actuator for reliable two-position or proportional control. The equal percentage flow characteristic provides stable, accurate modulation across a wide range of system pressures.

Key Features:

• Configuration: 2-Way, Normally Closed (NC) — spring returns to closed position on loss of air signal
• Connection Type: Union end connections for easy field installation and removal
• Valve Size: 1 inch
• Spring Range: 8–13 PSI pneumatic actuator
• Flow Coefficient (Cv): 14
• Flow Characteristic: Equal percentage for accurate proportional control
• Body Material: Cast bronze — rated 250 psig per ANSI Standards (B16.15-1985)
• Packing: Spring-loaded TFE (PTFE) packing for reliable, low-maintenance sealing
• Application: Chilled water, hot water, and steam systems
• Temperature Range: Water from 20°F to 281°F (-7°C to 138°C); steam to 281°F (138°C) maximum

The VK-7221-203-4-8 is a factory-assembled valve and actuator unit from Schneider Electric's Barber Colman product line, engineered for long service life in demanding commercial building automation and HVAC control applications.