Main Features

Manufacturer: Festo AG
Model/MPN: 530043 (HGL‑3/8‑QS‑8)
Valve Type: Piloted (unlockable) check valve — normally prevents flow from port 2→1 unless pilot pressure applied
Connections:
- Port 1 (inlet): 8 mm push-in tube (QS‑8)
- Port 2 (outlet): G⅜ threaded male
- Pilot port 21: G¼ threaded male
Operating Pressure: 0.5–10 bar; pilot pressure 1–10 bar
Flow Rate: ~830 L/min at Δp = 1 bar; up to 1,200 L/min at Δp = 6–0 bar
Materials & Seals: Die-cast zinc/aluminum body; NBR seals; POM release ring; RoHS compliant
Temperature Range: –10 °C to +60 °C
Mounting: Screw-in via male G⅜ thread; torque approx. 12.5 Nm
Design Features:
- Compact (55 g) and corrosion-resistant, Class 2
- Supports optional lubricated air, IP20, suitable for pneumatic braking or locking in actuators
Typical Applications: Position retention in pneumatic systems, pressure-holding in cylinders, safety circuits, and actuator end-of-travel lock

Festo – 530043 (HGL‑3/8‑QS‑8) – Piloted Check Valve, QS‑8 × G⅜