6509

Name: Festo 6509 One-way flow control valve GRA-1/4-B
Brand: Festo

One-way flow control valve GRA-1/4-B

The Festo part number 6509 is an industrial component featuring a one-way flow control function with G1/4 internal threads on both pneumatic connections and a knurled screw adjusting element. Housed in die-cast zinc with NBR seals, it supports a standard nominal flow rate of 420 l/min in the flow control direction and 780 l/min in the non-return direction across an operating pressure range of 0.01 MPa to 1 MPa (0.1 bar to 10 bar). This unit accommodates front panel mounting or through-hole mounting in any position, operates with compressed air according to ISO 8573-1:2010 [7:4:4] within a temperature range of -20 °C to 75 °C, and complies with ATEX Zone 1, 2, 21, and 22 explosion protection requirements. Submit the exact part number, quantity, and application requirements to request a quote.

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Manufacturer: Festo
Part number: 6509
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Technical Specifications

Valve function: One-way ow control function
Pneumatic connection 1: Internal thread G1/4
Pneumatic connection 2: Internal thread G1/4
Adjusting element: Knurled screw
Type of mounting: Alternatively: | Front panel mounting | With through-hole
Standard nominal ow rate in ow control direction: 420 l/min
Standard nominal ow rate in non-return direction: 780 l/min
Operating pressure: 0.01 MPa...1 MPa | 0.1 bar...10 bar | 1.45 psi...145 psi
Ambient temperature: -20 °C...75 °C
Housing material: Die-cast zinc
Explosion prevention and protection: Observe the information on the certicate | Zone 1 (ATEX) | Zone 2 (ATEX) | Zone 21 (ATEX) | Zone 22 (ATEX)
Mounting position: Any
Operating medium: Compressed air as per ISO 8573-1:2010 [7:4:4]
Information on operating and pilot media: Operation with oil lubrication possible (required for further use)
LABS (PWIS) conformity: VDMA24364-B1/B2-L
Storage temperature: -20 °C...75 °C
Temperature of medium: -20 °C...75 °C
Product weight: 180 g
Note on materials: RoHS compliant
Seals material: NBR

Engineering context

Identification and RFQ Guidance

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Use the manufacturer part number and model code—not appearance alone. Connection, size, material, voltage, pressure, seal, and control options can differ within the same product family.

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Provide quantity, delivery country and ZIP/postal code, required condition, target date, and photographs of the existing nameplate when available.

Technical verification

Our sourcing response is prepared against Festo 6509. Final compatibility remains subject to the machine manufacturer’s requirements and complete application data.