Festo H-1/2-B 11691 Non‑Return Valve G1/2 5500 L/min

Festo H‑1/2‑B (11691) is a non‑return (check) valve designed to allow compressed air to flow freely in one direction while blocking flow in the opposite direction. It features G1/2 threaded connections on both ports, a screw‑in mounting design, and an anodised wrought aluminium alloy body with NBR seals for industrial durability. Rated for standard nominal flow rates of up to 5500 l/min (from 6 to 5 bar) and an operating pressure range of 0.4 … 12 bar, it is suitable for applications requiring reliable, single‑direction air flow control, such as cylinder holding circuits, pilot supply lines, and safety interlocks, in central compressed air systems and general automation equipment.

Applications:

• Cylinder holding circuits preventing drift after solenoid valve switch‑off

• Pilot supply lines requiring reverse flow prevention

• Safety interlocks for dependable pressure maintenance

• Central compressed air systems and general industrial automation

Technical Specifications:

• Part number: 11691

• Valve function: Non‑return function (check valve)

• Pneumatic connection, port 1: G1/2 female

• Pneumatic connection, port 2: G1/2 female

• Operating pressure range: 0.4 … 12 bar (0.04 … 1.2 MPa)

• Standard nominal flow rate (1→2, 6 → 5 bar): 5500 l/min

• Ambient / media temperature: –10 °C … +60 °C

• Housing material: Anodised wrought aluminium alloy

• Seal material: NBR

• Mounting type: Screw‑in (threaded)

• Mounting position: Any

• Logistics dimensions (L × W × H): approx. 65 × 34 × 34 mm

• Product weight: approx. 58 g

• Corrosion resistance class (CRC): 2 – moderate

• RoHS compliant

System Integration:

• This valve belongs to Festo H series of stop valves with non‑return function.

• Compatible with G1/2 threaded pneumatic systems and components.

• Suitable for in‑line installation; can be mounted in any orientation.

• For detailed installation instructions, refer to the product catalogue or contact Festo support.

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

Related Products:

• H-1/4-B (11689) – G1/4 thread, lower flow rate

• H-3/8-B (11690) – G3/8 thread, medium flow rate

• H-3/4-B (11692) – G3/4 thread, higher flow rate

• HA-M5-QS-4 (153444) – M5 thread, push‑in connector version