V-3766-1003 Johnson Controls Valve

Overview

The Johnson Controls V-3766-1003 is a 1/2-inch pneumatically actuated flare valve designed to accurately regulate the flow of hot and cold water in small HVAC terminal units, such as fan coils, perimeter radiation, and reheat coils. Configured as a Pressure-Dependent Two-Way Cooling (PDTC) valve, it operates in a Normally Open (NO) fail-safe position, ensuring that full flow is maintained for freeze protection if the pneumatic signal is lost. Constructed with a durable brass or bronze body, this valve uses a push-down-to-close action and incorporates a modulating plug that provides an equal percentage relationship between valve travel and flow at a constant pressure drop.

Features

• Normally Open (NO) design maintains flow on loss of pneumatic signal, which is critical for heating safety.
• Modulating plug delivers an equal percentage flow characteristic for precise system regulation.
• Utilizes standard Johnson Controls non-adjustable ring pack packing for long life and proven reliability.
• Molded composition disc is bonded to the valve plug assembly to ensure tight shutoff and can be removed for servicing.
• Compatible with factory-installed V-3000-1 exposed pneumatic actuators or field-mounted enclosed actuators and electric actuators.

Specifications

• Valve Size: 1/2 inch
• Connection Type: Flare
• Configuration: Two-Way, Pressure-Dependent Two-Way Cooling (PDTC)
• Action: Normally Open (NO), Push-Down-to-Close
• Flow Coefficient (Cv): 3.2
• Spring Range: 3 to 6 PSI
• Rangeability: 23:1
• Maximum Allowable Pressure/Temperature: 400 psig up to 150°F, decreasing to 345 psig at 281°F
• Maximum Recommended Differential Pressure: 35 psi
• Valve Stem Diameter: 1/4 inch
• Valve Stroke: 5/16 inch
• Actuator Port Connection: 1/8 inch NPT barbed fitting for 5/32 inch or 1/4 inch OD polytubing

Applications

The V-3766-1003 is engineered for commercial HVAC hydronic systems to control the distribution of hot and cold water. It is ideally suited for terminal equipment including fan coil units, perimeter radiation, air handling units, and reheat coils. Its Normally Open operation makes it particularly effective for heating coil services where preventing frozen pipes during a control system signal loss is necessary.