Festo GR-QS-4 One-Way Flow Control Valve 4mm QS Push-In 110 L/min

Overview
The Festo GR-QS-4 (part number 193967) is a high-performance one-way flow control valve designed for precise pneumatic speed regulation. It reliably combines a sensitive, continuously adjustable throttling function with a robust non-return (check) mechanism for unidirectional flow control. This makes it particularly suited for applications requiring precise speed control of pneumatic actuators, such as the gentle lowering of loads or decelerating piston movements.

Engineered for inline installation, the valve features QS push-in connectors for 4 mm tubing, a knurled screw for easy adjustment, and a durable PA-reinforced housing with NBR seals. It offers a standard nominal flow rate of 110 liters per minute in the flow control direction and 165 liters per minute in the non-return direction, with a broad operating pressure range of 0.2 to 10 bar.

Key Features

• Precise Flow Control & Check Valve Function – Combines sensitive continuous throttling with a reliable non-return mechanism for unidirectional pneumatic speed control.

• QS Push-In Connector – Allows for quick and secure installation of 4mm plastic tubing without the need for special tools.

• Intuitive Knurled Screw Adjustment – Enables fine, tool-free adjustment of the flow rate for exact actuator speed regulation.

• Durable & Robust Construction – Features a glass-fiber reinforced PA (Polyamide) housing and NBR seals for resistance to industrial conditions, with a high-alloy steel adjusting screw and POM releasing ring.

• Wide Operating Range – Operates reliably in temperatures from -10°C to +60°C and pressures from 0.2 to 10 bar.

• Flexible Mounting Options – Supports in-line installation, optional front panel or through-hole mounting, and can be installed in any position.

• ATEX Certified – Compliant with ATEX standards for use in potentially explosive atmospheres (Zones 1, 2, 21, 22), and also RoHS compliant.

• Original Brand New, Within Warranty Period – Genuine Festo product, brand new in sealed packaging, covered by manufacturer's warranty.

• 100% Satisfaction Guarantee – Your purchase is protected by our satisfaction guarantee; return or exchange if not completely satisfied.

Technical Specifications

Applications
Ideal for precise speed control of pneumatic actuators (e.g., cylinder piston speed), gentle load lowering, and deceleration in a wide range of industrial applications including factory automation, packaging machinery, automotive manufacturing, metal fabrication, and general pneumatic control systems.

Package Includes

• 1 x Festo GR-QS-4 One-Way Flow Control Valve (193967)