Description
The Johnson Controls V-3766-1001 is a 1/2″ flare-connection zone valve engineered for reliable flow control in hot and cold water hydronic systems. Designed as a Pressure-Dependent Two-way Control (PDTC) valve in a Normally Open (NO) configuration, it closes upon actuator signal and returns to the open position when de-energized — making it ideal for fail-safe heating and cooling applications.
Key Specifications
- Connection Type: 1/2″ Flare
- Valve Configuration: PDTC – Normally Open (NO)
- Spring Range: 3–6 PSI
- Flow Coefficient: 1.0 Cv
- Media: Hot and Cold Water
- Valve Stem Diameter: 1/4″
- Valve Stroke: 5/16″
- Actuator Port: 1/8″ NPT Barbed Fitting compatible with 5/32″ or 1/4″ OD polytubing
Design & Performance Features
- Normally Open fail-safe design ensures flow is maintained if actuator signal is lost
- 3–6 PSI spring range provides precise pneumatic actuation control
- 1.0 Cv flow rating supports accurate hydronic balancing in zone applications
- 1/2″ flare connections simplify installation and ensure leak-free sealing
- 1/8″ NPT barbed actuator port accommodates both 5/32″ and 1/4″ OD polytubing for flexible pneumatic hookup
- Compact 5/16″ valve stroke and 1/4″ stem diameter suit space-constrained installations
- Compatible with hot and cold water service for year-round HVAC system use
Typical Applications
- Pneumatically controlled hydronic zone valves in commercial HVAC systems
- Fan coil unit water flow control
- Variable air volume (VAV) and two-pipe changeover systems
- Building automation systems requiring pneumatic valve actuation
Why Choose the Johnson Controls V-3766-1001?
Johnson Controls is a globally recognized leader in building controls and HVAC solutions. The V-3766-1001 delivers dependable pneumatic valve performance with a straightforward installation profile, making it a trusted choice for commercial HVAC contractors and building automation professionals. Its Normally Open design and precise spring range ensure consistent, safe operation across a wide range of hydronic system configurations.







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