Norgren T74E-4AA-P1N Lockout Air Valve 1/2 Inch Npt

Product Description

The NORGREN T74E-4AA-P1N is a 3-port, 2-position lockout air valve designed for pneumatic safety and isolation applications. It uses a slide actuator to provide a positive shutoff of compressed air supply, allowing technicians to safely lock out energy sources during equipment service and maintenance. The valve flows at a Cv rating of 8.1 and handles a maximum working pressure of 250 psi, making it suitable for demanding industrial pneumatic circuits. Both the inlet and outlet are 1/2 inch NPT threaded connections. Weighing 1.14 pounds, this valve is a compact and robust choice for machine safety compliance tasks performed by maintenance mechanics and pneumatic system technicians.

This valve is used in industrial and manufacturing environments where pneumatic lockout/tagout procedures are required under OSHA energy control regulations. Typical installations include air-powered machinery, automated assembly equipment, and process lines where a technician must isolate downstream air pressure before servicing actuators, cylinders, or pneumatic controls. The 3-port configuration and slide actuator allow the operator to both shut off supply and exhaust downstream pressure in a single action, confirming a zero-energy state before maintenance begins.

Key Features

• Slide actuator provides positive lockout action for pneumatic energy isolation
• 3-port, 2-position design shuts off supply and exhausts downstream pressure simultaneously
• Cv rating of 8.1 supports high-flow pneumatic circuits up to 243 CFM
• 250 psi maximum working pressure for heavy-duty industrial service
• 1/2 inch NPT threaded inlet and outlet for standard pipe fitting connections
• Operating temperature range from -30 degrees F to 150 degrees F (-34 degrees C to 65 degrees C)

Compatibility

Designed as an OEM-style replacement or direct installation component for industrial pneumatic systems requiring 1/2 inch NPT lockout valves with slide actuator operation.

Installation Notes

Installation should be performed by a qualified maintenance mechanic or pneumatic systems technician. Depressurize the upstream air supply and bleed all downstream pressure before removing or installing the valve. Apply thread sealant appropriate for compressed air service to all NPT connections and verify no leaks before returning the system to operation. Lockout/tagout procedures should comply with applicable OSHA 29 CFR 1910.147 energy control requirements.