Festo GR-3/8-B 6308 One‑Way Flow Control Valve G3/8

Description:
Festo GR‑3/8‑B is a one‑way flow control valve with non‑return function. Compressed air is steplessly adjustable in one direction and can flow freely in the opposite direction. Standard nominal flow rate 1010 l/min in flow control direction / 1150 l/min in non‑return direction. Die‑cast zinc housing, roll‑ toothed knurled screw for adjustment, panel mounting possible. For cylinder speed control in automated production lines, material handling systems, packaging machinery and general industrial pneumatics.

Applications:

• Cylinder speed control in pneumatic systems

• Flow regulation in assembly and factory automation

• Material handling and conveyor systems

• Packaging machinery and OEM equipment

Core Specifications:

• Valve function: One‑way flow control with non‑return function

• Pneumatic connection: G3/8 (female thread on both sides)

• Standard nominal flow rate (flow control direction): 1010 l/min

• Standard nominal flow rate (non‑return direction): 1150 l/min

• Adjusting element: Roll‑toothed knurled screw

• Type of mounting: In‑line installation, optionally front panel mounting with through‑hole

• Housing material: Die‑cast zinc

• Seal material: NBR

• Adjusting screw material: Brass

• Operating pressure: 0.1 … 10 bar

• Ambient / media temperature: –20 … +75 °C

• Operating medium: Compressed air to ISO 8573‑1:2010 [7:4:4]; oil‑lubricated operation possible (continued lubrication required if applied)

• Product weight: approx. 225 g

Advanced Specifications:

• Nominal width: 7 mm

• Explosion protection: ATEX Zone 1, 2, 21, 22 (certificate‑relevant)

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

• Corrosion resistance class (CRC): 2 – moderate corrosion stress

• RoHS compliant

System Integration:

• Belongs to Festo GR series of one‑way flow control valves.

• Compatible with pneumatic systems with G3/8 threaded connections.

• Can be mounted in any position; panel mounting via through‑bore possible.

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

Related Products:

• GR‑1/4‑B (151174) – Same series, G1/4 thread

• GR‑1/2‑B (3720) – Same series, G1/2 thread, higher flow

• GR‑3/8‑B (6308) – Current model (order no. 6308)

• GRU‑3/8‑B (9518) – Exhaust air flow control valve