Festo GRLA-1/4-B 151166 One‑Way Flow Control Valve G1/4

Festo GRLA-1/4-B is a one‑way flow control valve used to regulate the piston speed of pneumatic cylinders during advance and return strokes. The flow control function works in one direction (exhaust air or supply air), while the non‑return function operates in the opposite direction. G1/4 female thread connections on both ports. Designed for factory automation, material handling, and packaging machinery.

Applications:

• Pneumatic cylinder speed regulation

• Factory automation and assembly lines

• Material handling and conveying systems

• Packaging machinery

Core Specifications:

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

• Standard nominal flow rate (flow control direction): 610 L/min at 6 → 0 bar

• Standard nominal flow rate (non‑return direction): 885 … 1615 L/min at 6 → 0 bar

• Pneumatic connection, port 1: Female thread G1/4

• Pneumatic connection, port 2: Male thread G1/4

• Adjusting element: Slotted head screw

• Adjustment factor: Knurled screw (for fine flow regulation)

• Operating pressure: 0.3 to 10 bar

• Media temperature: –10 °C to +60 °C

• Ambient temperature: –10 °C to +60 °C

• Material: Anodised wrought aluminium alloy, brass, die‑cast zinc, high‑alloy stainless steel, polyamide reinforced

• Mounting type: Screw‑in

Advanced Specifications:

• Nominal size: 6 mm

• Max. tightening torque: 11 Nm

• Product weight: approx. 59 g

• Operating medium: Compressed air (ISO 8573‑1:2010 [7:4:4]), lubricated operation possible

• Corrosion resistance class (CRC): 1

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

• Cleanroom class: Class 4 (ISO 14644‑1)

• Maritime classification: available upon certificate request

• Explosion protection: Zone 1 / 2 / 21 / 22 (ATEX)

• RoHS compliant

System Integration:

• Belongs to Festo GRLA series of one‑way flow control valves.

• Compatible with G1/4 threaded pneumatic components.

• Can be mounted in any position, with flow direction indicated on the valve body.

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

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

Related Products (upgrade path):

• Smaller port size → GRLA‑1/8‑B (151165, G1/8 ports)

• Current model → GRLA‑1/4‑B (151172)

• Larger port size → GRLA‑3/8‑B (G3/8 ports)

• Alternative adjusting knob → GRLA‑1/4‑RS‑B (151175, with knurled screw for finger adjustment)