Festo GR-QS-4 193967 One-Way Flow Control Valve 4mm Push‑In

Festo GR-QS-4 is a one‑way pneumatic flow control valve with a non‑return function. It provides precise flow regulation in compressed air systems for cylinder speed control and actuator timing. The 4mm quick‑push‑in connectors enable fast, tool‑free assembly. The knurled adjustment screw allows intuitive manual setting, while the built‑in check valve prevents reverse flow, ensuring stable operation in automation and packaging lines.

Applications:

• Pneumatic cylinder speed control (meter‑in or meter‑out)

• Flow regulation in factory automation and assembly systems

• Air flow control for packaging and material handling equipment

• Integration into Festo CPI, MPA, and CPX valve terminals

Core Specifications:

• Valve function: Flow control with non‑return

• Pneumatic connection: QS-4 (push‑in connector for 4mm O.D. tubing)

• Standard nominal flow rate (flow control direction): 110 l/min

• Standard nominal flow rate (non‑return direction): 165 l/min

• Adjusting element: Knurled screw (finger‑operated)

• Operating pressure: 0.2 bar to 10 bar

• Mounting type: Front panel mounting with through‑hole or via accessory

• Mounting position: Any

• Housing material: PA‑reinforced

• Seals material: NBR

• Product weight: 12 g

• Ambient / media temperature: -10 °C to 60 °C

Advanced Specifications:

• Symbol: 00991453

• Operating medium: Compressed air to ISO 8573‑1:2010 [7:4:4]

• Operation with oil lubrication: possible (continued lubrication required)

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

• Explosion protection: ATEX Zone 1, 2, 21, 22 (refer to certificate)

• Releasing ring material: POM

• Knurled head material: PA‑reinforced

• Adjusting screw material: High‑alloy steel

• RoHS compliant

System Integration:

• Compatible with Festo GR series manifold systems, CPI, MPA, VTSA valve terminals, and 4mm nylon, polyurethane, or PTFE tubing.

• Flow control can be used for supply air (meter‑in) or exhaust air (meter‑out) depending on installation orientation.

• Front panel mounting enabled via through‑hole with accessory; detailed instructions available in the product hardware manual.

Related Products:

• GR‑1/4 (2101) – G1/4 threaded port version

• GRLA‑1/4‑QS‑6‑RS‑D (534338) – Exhaust air flow control for 6mm tubing

• GR‑1/2 (3720) – High‑flow G1/2 threaded version