Norgren C/840 Needle Air Flow Control Valve 3/4 in Npt

Product Description

The NORGREN C/840 is a needle-type air flow control valve designed for precise regulation of airflow in pneumatic systems. Built with a brass body and NPT threaded connections, this valve controls in-flow direction, allowing technicians to meter air entering a circuit rather than exhausting it. The 3/4-inch tube outside diameter and matching NPT inlet size make it suitable for mid-range pneumatic line installations. It weighs approximately 0.17 pounds, keeping it lightweight for panel or inline mounting. Licensed HVAC technicians, pneumatic system technicians, and industrial maintenance professionals are the typical installers for this type of component.

This valve is used in pneumatic control circuits where precise in-flow throttling is required. Common applications include compressed air systems, pneumatic actuator supply lines, and industrial automation equipment where airflow rate must be adjusted and held consistently. The in-flow configuration means the needle restricts air as it enters the downstream component, providing stable flow control without relying on exhaust-side metering. This makes it a practical choice for single-acting actuator supply lines and similar circuits in both light industrial and commercial mechanical systems.

Key Features

• Needle valve design provides fine, repeatable airflow adjustment
• Brass body construction offers corrosion resistance in typical compressed air environments
• In-flow control direction meters supply air entering downstream components
• 3/4-inch NPT connection matches common mid-range pneumatic line fittings
• Compact and lightweight at 0.17 pounds for easy inline or panel integration

Compatibility

Designed as an OEM-style replacement or direct-fit component for pneumatic systems utilizing 3/4-inch NPT threaded connections and requiring in-flow needle valve control.

Installation Notes

Installation should be performed by a qualified pneumatic or mechanical technician. Depressurize the entire pneumatic circuit before removing or installing this valve. Apply thread sealant appropriate for compressed air service to the NPT threads before assembly, and hand-tighten before using a wrench to avoid over-torquing the brass body. Verify flow direction markings during installation to ensure the valve is oriented for in-flow control as designed.