Johnson Controls V-3800-651 Union Angle Valve 3/4" Normally Open 3-6 PSI 3.7Cv

The Johnson Controls V-3800-651 is a 3/4" union angle valve, commonly used in HVAC and plumbing systems. It's a normally-open (N/O) valve, meaning it allows water or steam to flow freely by default. When pressure drops below a specific range, typically between 3 and 6 PSI in this model, the valve automatically closes to shut off flow. This makes it useful in applications where automatic shut-off is necessary when pressure falls below a certain level, like protecting equipment or preventing system overflows. The union angle design simplifies installation and maintenance by offering easy connection to pipes coming from different directions.