R-3712-3007 Johnson Controls Tee (Pack of 5)

Overview

The Johnson Controls R-3712-3007 is a 1/4 inch diode restrictor tee designed for inline installation in pneumatic HVAC control systems to regulate airflow direction. It allows air to flow through the bottom of the tee in one direction only and features a built-in 0.007-inch restrictor on one branch to permit a controlled leak or bleed, enabling it to function as a high signal selector, signal override device, or check valve.

Features

• Inline configuration designed for easy installation using 1/4 inch O.D. flexible pneumatic tubing.
• Integrated 0.007-inch restrictor located on one branch, clearly identified by a symbol stamped above it.
• Directional diode functionality that permits airflow through the bottom of the tee in a single direction only.
• Durable thermoplastic construction ensuring reliable performance in commercial and industrial environments.
• Versatile utility allowing the device to serve as a check valve, signal selector, or an override component.

Specifications

• Orifice / Restrictor Size: 0.007 inches (0.18 mm)
• Tubing Connections: 1/4 inch barb fittings
• Maximum Operating Pressure: 25 psig (175 kPa)
• Maximum Operating Temperature: 180°F (82°C)
• Output Flow Capacity: 45 SCIM (12.3 mL/s) at 20 psig

Applications

• Pneumatic control loops within commercial HVAC systems to safely manage air distribution and pressure signals.
• High signal selector systems utilizing multiple diodes to choose the peak pressure output among various control devices.
• Signal override applications that enable a primary signal (such as a 20 psig fan shutdown command) to override local thermostats and close normally open valves or actuators.
• Check valve setups when the restricted branch is capped to prevent backfeeding or unwanted reverse airflow.