Description
The Johnson Controls V-3766-1003 is a 1/2″ flare-connection pneumatically actuated valve engineered for reliable flow control in commercial HVAC hydronic systems. Configured as a Pressure-Dependent Two-Way Cooling (PDTC) valve in a Normally Open (NO) fail-safe position, it is ideally suited for both hot and cold water applications where dependable pneumatic modulation is required.
Key Specifications
- Connection Type: 1/2″ Flare
- Valve Action: PDTC – Normally Open (NO)
- Spring Range: 3–6 PSI
- Flow Coefficient (Cv): 3.2
- Service: 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
Product Highlights
- Normally Open fail-safe design ensures flow is maintained on loss of pneumatic signal — ideal for heating applications where freeze protection is critical
- 3–6 PSI spring range provides precise modulating control across a wide range of pneumatic control systems
- 3.2 Cv flow rating delivers accurate flow capacity for 1/2″ hydronic circuits
- 1/8″ NPT barbed actuator port accommodates both 5/32″ and 1/4″ OD polytubing for flexible pneumatic line connections
- Compact 5/16″ valve stroke and 1/4″ stem diameter for reliable, repeatable actuation
- Compatible with hot and cold water service for year-round HVAC system use
Application
The V-3766-1003 is designed for use in pneumatically controlled hydronic heating and cooling systems, including fan coil units, air handling units, and terminal unit applications. Its Normally Open configuration makes it well-suited for heating coil service where flow must be maintained during a pneumatic signal failure. The 1/2″ flare connection ensures a leak-free, easy-to-install interface with copper tubing commonly found in commercial HVAC installations.
Compatible Actuators
This valve is designed to accept a pneumatic actuator via its 1/8″ NPT barbed fitting port. Polytubing with an OD of 5/32″ or 1/4″ connects directly to the actuator port for clean, reliable pneumatic signal delivery.
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