Overview
The Festo GRL-1/4NPT flow control valve is a proven one-way pneumatic valve that combines a throttle check valve with a piloted non-return function. Built for precision and durability, this valve enables accurate flow-rate adjustment in compressed-air systems operating between 0.3 and 10 bar. The compact, lightweight design incorporating plastic and metal construction makes it ideal for both inline and manifold mounting in industrial automation, packaging, and process control applications.
Key Features
- One-way flow control – Throttles flow in one direction; non-return function prevents backflow
- Adjustable flow rate – Slotted-head screw adjustment allows precise speed regulation
- Lightweight construction – Polymer and metal combination reduces installation footprint
- NPT threaded connection – G 1/4″ NPT female ports for standard industrial piping
- Wide pressure range – Rated 0.3–10 bar for flexible system integration
- Low maintenance – Stainless steel internal components resist corrosion and wear
Technical Specifications
- Valve Type: One-way flow control (throttle check)
- Connection: G 1/4″ NPT (female threaded)
- Pressure Range: 0.3–10 bar
- Max Flow Rate: Variable (function of adjustment screw setting)
- Operating Temperature: –10°C to +60°C
- Seals: NBR (Nitrile Butadiene Rubber)
- Adjusting Mechanism: Slotted-head screw with locking collar
- Body Material: Aluminum alloy with zinc-plated brass ports
- Swivel Connection: Die-cast zinc for flexible installation
- Medium: Compressed air per ISO 8573-1:2010 [7;4;4]
Typical Applications
- Pneumatic cylinders – Speed control in extend/retract operations
- Automated machinery – Flow regulation in robotic arms and actuators
- Packaging equipment – Precise air control for valve sequences
- Process control systems – Throttling in manifold networks
- Maintenance repairs – Direct replacement for worn flow-control valves
Compatibility & Replacements
Compatible With
- Festo pneumatic cylinders and actuators
- Standard pneumatic control manifolds with 1/4″ NPT ports
- Compressed-air supply systems (ISO 8573-1 compliant)
- Allen-Bradley, Siemens, and other PLC-controlled pneumatic networks
- Standard ISO and metric modular valve stations
Replaces / Drop-In Replacement For
- Earlier Festo GRL-1/4 generation valves
- Worn or damaged throttle-check valve assemblies (1/4″ NPT)
- Similar profile one-way flow control valves from other manufacturers (verify port size and pressure rating before substitution)
Works With
- Pneumatic solenoid valves in directional control sequences
- Air logic circuits and pilot-operated valve systems
- Pneumatic speed controllers and actuator regulators
- ISO 4401 (NG10/NG16) manifold platforms
- Compressed-air supply filters and pressure regulators
