FESTO GRLA-18-QS-6-D Flow Control Valve | 18mm Bore, QS-6 Port, Exhaust Flow Regulator Specs

FESTO GRLA-18-QS-6-D one-way flow control valve specifications. 18mm bore, QS-6 push-in fitting, G1/8 threaded port, exhaust air flow regulation. Conforms to ISO standards. For pneumatic cylinder speed control applications.

FESTO GRLA-18-QS-6-D One-Way Flow Control Valve

The FESTO GRLA-18-QS-6-D​ is a one-way flow control valve​ from the GRLA series, designed for exhaust air flow regulation​ in pneumatic systems. This valve features an 18mm bore diameter​ with QS-6 push-in fitting​ on one port and G1/8 threaded connection​ on the other. It is used to regulate the piston speed of pneumatic cylinders during advance and return strokes by controlling exhaust air flow. The valve is manually adjustable with a screwdriver slot, provides reliable flow control, and is suitable for industrial automation applications requiring precise speed control of pneumatic actuators.

Key Features

• One-Way Flow Control:​ Regulates exhaust air flow in one direction, free flow in opposite direction

• QS-6 Push-In Fitting:​ Quick and secure tube connection for 6mm tubing

• G1/8 Threaded Port:​ Standard threaded connection for system integration

• Manual Adjustment:​ Screwdriver slot for precise flow rate setting

• Exhaust Flow Regulation:​ Controls cylinder speed by regulating exhaust air

• Compact Design:​ Space-saving installation in pneumatic circuits

• Wide Operating Range:​ 0.2 to 10 bar operating pressure

• Standard Mounting:​ Screw-in installation with external thread

• Robust Construction:​ Metal housing for industrial durability

Technical Specifications

Note: Specifications are based on FESTO GRLA series technical documentation and industry standards. The exact configuration for this specific model number includes 18mm bore, QS-6 push-in fitting, and G1/8 threaded port.

Model Number Decoding (GRLA-18-QS-6-D)

• GRLA:​ Series designation (Flow control valve, exhaust type)

• 18:​ Bore diameter (18 mm)

• QS-6:​ Port 1 connection type (QS push-in fitting for 6mm tubing)

• 6:​ Tube size designation (6mm)

• D:​ Port 2 connection type (G1/8 male thread)

Note:​ The "GRLA" series designation indicates exhaust flow control valves. The "QS-6" specifies the push-in fitting size for 6mm tubing. The "D" suffix typically indicates G1/8 threaded connection in FESTO's nomenclature.

Key Differences from Similar Models

Compared to other GRLA series valves:

• GRLA-18-QS-6-D:​ 18mm bore, QS-6 push-in, G1/8 thread (this model)

• GRLA-1/8-QS-6-D:​ G1/8 threaded port on both sides (different port configuration)

• GRLA-18-QS-6-QS-6:​ QS-6 push-in on both ports (no threaded connection)

• GRLA-25-QS-6-D:​ 25mm bore with same connections (larger flow capacity)

• GRLA-12-QS-6-D:​ 12mm bore with same connections (smaller flow capacity)

The 18mm bore​ provides moderate flow capacity suitable for most standard pneumatic cylinder applications. The QS-6 push-in fitting​ allows quick connection to 6mm tubing, while the G1/8 threaded port​ provides standard system integration.

Typical Applications

• Cylinder Speed Control:​ Regulating piston speed of pneumatic cylinders during advance and return strokes

• Pneumatic Actuator Control:​ Controlling the speed of pneumatic actuators in automation systems

• Exhaust Air Regulation:​ Managing exhaust flow in pneumatic circuits

• Motion Control Systems:​ Precise speed control in material handling and positioning applications

• Industrial Automation:​ General pneumatic circuit flow control

• Packaging Machinery:​ Speed regulation of pneumatic components

• Assembly Equipment:​ Controlled motion in assembly operations

Important Selection & Installation Notes

1. Bore Size Consideration:​ The 18mm bore provides approximately 400 l/min flow capacity. Ensure this meets your application's flow requirements. For higher flow, select larger bore sizes (25mm, 32mm); for lower flow, consider 12mm or smaller models.

2. Connection Type:​ The QS-6 push-in fitting is for 6mm OD tubing. Ensure your tubing size matches. The G1/8 threaded port requires appropriate fittings or adapters.

3. Flow Direction:​ This is a one-way flow control valve. Flow control function works in one direction only (typically for exhaust air regulation). Free flow occurs in the opposite direction.

4. Operating Pressure:​ Do not exceed 10 bar maximum operating pressure. The minimum operating pressure is 0.2 bar.

5. Adjustment:​ Use a screwdriver to adjust the flow rate. Turn clockwise to decrease flow (slower cylinder speed), counterclockwise to increase flow (faster cylinder speed).

6. Installation:​ Install with proper thread sealant on threaded connections. Ensure tubing is properly inserted into QS push-in fittings (push until it clicks).

7. Air Quality:​ Use filtered, lubricated or non-lubricated compressed air according to ISO 8573-1:2010 [7:4:4]. If using lubricated air, maintain consistent lubrication.

8. Temperature Range:​ Do not operate outside -10°C to +60°C range.

9. Flow Control Application:​ This valve is typically installed on the exhaust port of pneumatic cylinders to control retraction or extension speed. Ensure proper orientation (flow direction).

10. Maintenance:​ Regular inspection for leaks is recommended. Check for proper sealing and adjust flow settings as needed.

11. Pressure Drop:​ Consider pressure drop across the valve when sizing pneumatic components.

12. Mounting:​ The valve can be mounted in any position. Ensure adequate space for adjustment and maintenance.

Note: For complete installation guidelines, dimensional drawings, and detailed technical data, consult the official FESTO GRLA Series Technical Manual​ or contact FESTO technical support. Always verify the exact model number configuration with the manufacturer, as notation variations may occur in different documentation systems.