Festo GRLA-1/8-QS-8-D 193145 One-Way Flow Control Valve G1/8 to 8mm

Festo GRLA-1/8-QS-8-D is a one-way flow control valve with non-return function for precise piston speed regulation in pneumatic cylinders. Permits stepless flow adjustment in one direction (exhaust air) while allowing free flow in the opposite direction. Features a G1/8 male thread and a QS-8 push-in fitting for 8 mm OD tubing. Adjustable via a slotted head screw. Suitable for cylinder speed control in factory automation, packaging machinery, and assembly systems.

Applications:

• Pneumatic cylinder speed control (meter‑out, exhaust air)

• Flow regulation in assembly and factory automation lines

• Conveyor systems and material handling equipment

• Packaging machinery and industrial pneumatic systems

Core Specifications:

• Valve function: Exhaust air one-way flow control with non-return function

• Pneumatic connection, port 1: QS-8 (push‑in fitting for 8 mm OD tubing)

• Pneumatic connection, port 2: G1/8 male thread (BSPP)

• Adjusting element: Slotted head screw

• Standard nominal flow rate (flow control direction): 215 l/min (at 6 bar)

• Standard nominal flow rate (non‑return direction): 175 … 250 l/min (at 6 bar)

• Operating pressure range: 0.2 … 10 bar

• Ambient / media temperature: –10 °C … +60 °C

• Operating medium: Compressed air to ISO 8573‑1:2010 [7:4:4] (lubricated operation possible; continued lubrication required if applied)

• Housing material: Wrought aluminium alloy (anodised), die‑cast zinc, PBT

• Seal material: NBR

• Product weight: approx. 22 g

Advanced Specifications:

• Nominal torque: 3 Nm (± 10 %)

• Mounting position: any

• Threading type: G1/8 with external hexagon, spanner size 14 mm

• Overlap: positive

• Type of piloting: Directly actuated shut-off

• Tube insertion depth: 19 mm

• Corrosion resistance class (CRC): 2 – moderate corrosion stress

• Cleanroom suitability: Class 4 according to ISO 14644‑1

• LABS (PWIS) conformity: VDMA24364‑B1/B2‑L

• Explosion protection: Zone 1 (gas) / Zone 2 (gas) / Zone 21 (dust) / Zone 22 (dust) [ATEX]

• RoHS compliant

System Integration:

• The QS‑8 push‑in fitting accepts 8 mm OD tubing (e.g., PUN, PAN, PEN series).

• Use in the exhaust air path (meter‑out) for stable cylinder motion control.

• After tightening the G1/8 male thread, the valve can be swivelled 360° via the die‑cast zinc swivel connection.

• For detailed assembly instructions and pneumatic circuit diagrams, refer to the product hardware manual.

Standards & Compliance:
Refer to manufacturer official documentation for detailed certification and compliance information.

Related Products:

• GRLA-1/8-QS-8-RS-D (534337) – Same function, rotary knob adjustment

• GRLA-1/8-QS-6-D (193144) – Same function, 6 mm push‑in fitting (lower flow)

• GRLA-1/4-QS-8-D (193147) – Larger G1/4 thread, higher flow (475 l/min)