FESTO HE-3-14-QS-8 Shut-off Valve | 3/2 Bistable Manual Valve, 1/4 Thread, QS-8 Push-in Specs

FESTO HE-3-14-QS-8 3/2-way manual shut-off valve specifications. 1/4" male thread port, QS-8 push-in connector, bistable operation, 423.9 l/min flow rate. For pneumatic system isolation and control applications.

FESTO HE-3-14-QS-8 3/2-Way Manual Shut-off Valve

The FESTO HE-3-14-QS-8​ is a 3/2-way bistable manual shut-off valve​ from the HE series, featuring a 1/4" male thread port​ and a QS-8 push-in connector. This compact pneumatic valve is designed for manual on/off control and isolation of pneumatic circuits. With bistable operation (maintains position without continuous actuation), the valve provides reliable flow control for industrial automation applications, including machine isolation, maintenance operations, and manual override functions in pneumatic systems.

Key Features

• 3/2-Way Valve Function:​ Three ports, two positions (normally closed or normally open)

• Bistable Operation:​ Maintains position without continuous manual input

• Manual Actuation:​ Push-pull or lever operation (depending on variant)

• Mixed Port Configuration:​ 1/4" male thread port and QS-8 push-in connector

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

• High Flow Capacity:​ 423.9 l/min nominal flow rate

• Wide Operating Pressure:​ 0.2 to 10 bar operating range

• Multiple Mounting Options:​ Through-hole mounting or in-line installation

• Exhaust Function:​ Integrated exhaust port for pressure relief

• Robust Construction:​ Reinforced PBT housing for industrial durability

Technical Specifications

Note: Specifications are based on FESTO HE series technical documentation and industry standards. The exact configuration for this specific model number includes 1/4" thread port, QS-8 push-in connector, and 3/2 bistable function.

Model Number Decoding (HE-3-14-QS-8)

• HE:​ Series designation (Manual shut-off valve series)

• 3:​ Valve function (3/2-way)

• 14:​ Port 1 connection type (1/4" thread, typically R1/4 or G1/4)

• QS-8:​ Port 2 connection type (QS push-in fitting for 8mm tubing)

Note:​ The "3" indicates 3/2-way valve function (three ports, two positions). The "14" typically refers to 1/4" thread size. The "QS-8" specifies the push-in fitting size for 8mm tubing. This is a mixed-port configuration valve.

Key Differences from Similar Models

Compared to other HE series valves:

• HE-3-14-QS-8:​ 1/4" thread​ + QS-8 push-in​ (this model, mixed ports)

• HE-3-QS-8-QS-8:​ QS-8 push-in on both ports (no threaded connection)

• HE-3-1/4-1/4:​ 1/4" thread on both ports (no push-in)

• HE-3-1/8-QS-8:​ 1/8" thread + QS-8 (smaller thread size)

• HE-3-3/8-QS-8:​ 3/8" thread + QS-8 (larger thread size)

• HE-2-14-QS-8:​ 2/2-way valve with same connections (different valve function)

The 1/4" thread port​ provides standard threaded connection for system integration, while the QS-8 push-in connector​ allows quick connection to 8mm tubing. This mixed-port configuration offers flexibility in system design.

Typical Applications

• System Isolation:​ Manual shut-off for maintenance and service operations

• Manual Override:​ Emergency stop or manual control in automated systems

• Test Points:​ Manual control for testing and commissioning

• Machine Safety:​ Isolation of pneumatic circuits during maintenance

• Pneumatic Control:​ Manual on/off control of pneumatic actuators

• Maintenance Stations:​ Manual valves in maintenance panels

• Process Control:​ Manual intervention in automated processes

Important Selection & Installation Notes

1. Valve Function:​ This is a 3/2-way bistable​ valve. It has three ports (1, 2, 3) and two positions. Ensure this valve function meets your application requirements (normally closed or normally open operation).

2. Port Configuration:​ Port 1 is 1/4" male thread (typically R1/4 or G1/4), Port 2 is QS-8 push-in for 8mm OD tubing. Ensure your system connections match these specifications.

3. Flow Direction:​ The valve has a specific flow direction (indicated by arrow). Install with correct orientation.

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

5. 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.

6. Mounting:​ Can be mounted via through-holes or in-line. Ensure proper alignment and avoid excessive force during installation.

7. Manual Operation:​ The valve is manually actuated (push-pull or lever). Ensure adequate access for operation.

8. Exhaust Port:​ Port 3 is the exhaust port (not ducted). Ensure adequate ventilation for exhaust air.

9. Temperature Range:​ Do not operate outside 0°C to 60°C range.

10. Flow Capacity:​ The 423.9 l/min flow rate is suitable for most standard pneumatic applications. Verify your system flow requirements.

11. Thread Type:​ Confirm the exact thread type (R1/4, G1/4, or NPT1/4) for your system. Use appropriate thread sealant if required.

12. Maintenance:​ Regular inspection for leaks is recommended. Check for proper sealing and smooth operation.

Note: For complete installation guidelines, dimensional drawings, and detailed technical data, consult the official FESTO HE 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.