Description
The Johnson Controls VG7251ES+3801B is a factory-matched valve and actuator assembly engineered for precise flow control in commercial HVAC hydronic systems. Combining a 2-way normally open union globe valve body with a spring-return pneumatic actuator, this assembly delivers reliable, fail-safe modulating control straight out of the box.
Valve Body Features
- Configuration: 2-Way, Normally Open (N.O.)
- Connection Size: 1/2″ union end connections for easy in-line installation and serviceability
- Body Style: Union Globe
- Flow Coefficient: 1.8 Cv
- Flow Characteristic: Equal Percentage — ideal for modulating control applications
- Body Material: Cast Bronze for corrosion resistance and long service life
- Trim Material: Brass for reliable seating and durability
Pneumatic Actuator Features
- Actuator Type: Spring Return Pneumatic
- Spring Range: 3–6 PSI — compatible with standard pneumatic control systems
- Action: Spring return provides fail-safe normally open position on loss of air signal
- Designed for use with pneumatic controllers and positioners in DDC and pneumatic building automation systems
Assembly Highlights
- Factory-matched valve and actuator for guaranteed compatibility and performance
- Union end connections allow the valve body to be removed without disturbing the piping
- Equal percentage flow characteristic provides stable control across a wide range of load conditions
- Cast bronze body and brass trim construction suited for hot water, chilled water, and glycol service
- Compact assembly footprint simplifies installation in mechanical rooms and air handling units
Typical Applications
- Fan coil unit hot water and chilled water coil control
- Air handling unit heating and cooling coil control
- Terminal unit flow regulation in pneumatic HVAC systems
- Commercial building automation and energy management systems
The VG7251ES+3801B is a trusted Johnson Controls solution for contractors and building automation professionals who require dependable pneumatic valve control with the convenience of a pre-assembled, ready-to-install package.
Reviews
There are no reviews yet.