540661

Name: Festo 540661 One-way flow control valve GRLSA-1/8-QS-6
Brand: Festo

One-way flow control valve GRLSA-1/8-QS-6

The Festo part number 540661 is an industrial component featuring an exhaust air flow control non-return function with manual actuation via an internal hex adjusting element. It is equipped with a QS-6 pneumatic connection 1 and a G1/8 pneumatic connection 2 for screw-in mounting in any position, operating within an ambient and medium temperature range of -10 °C to 60 °C and an operating pressure range of 0.2 bar to 10 bar. This component processes compressed air as per ISO 8573-1:2010 [7:4:4], supports oil lubrication operation, and achieves a standard nominal flow rate of 0 l/min to 250 l/min in the flow control direction and 180 l/min to 310 l/min in the non-return direction. Please submit the exact part number, quantity, and application requirements to receive a quote.

Request pricing and availabilityCommercial response within one business day for your destination and required quantity.

Request a Quote

Why no listed price?

Industrial and obsolete parts are priced per enquiry: the final price depends on available stock, condition, quantity, and your delivery destination, so a fixed list price would be misleading. Request a quote and we confirm current pricing, lead time, and sourcing options — including hard-to-find and discontinued Festo references — within one business day.

Manufacturer: Festo
Part number: 540661
Data verification: Manufacturer evidence reviewed

For a faster response, include quantity, condition, and delivery destination.

Exact part-number verificationTechnical properties are matched to 540661.

Worldwide sourcingSupport for planned and urgent industrial requirements.

Manufacturer documentationA document is added when the reviewed source provides one.

Verified configuration

Technical Specifications

Valve function: Exhaust air ow control non-return function
Pneumatic connection 1: QS-6
Pneumatic connection 2: G1/8
Actuation type: Manual
Adjusting element: Internal hex
Type of mounting: Screw-in
Standard nominal ow rate in ow control direction: 0 l/min...250 l/min
Standard nominal ow rate in non-return direction: 180 l/min...310 l/min
Ambient temperature: -10 °C...60 °C
Mounting position: Any
Operating pressure for entire temperature range: 0.2 bar...10 bar
Standard ow rate in ow control direction 6 -> 0 bar: 0 l/min...410 l/min
Standard ow rate in non-return direction at 6 -> 0 bar: 430 l/min...540 l/min
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-B2-L
Cleanroom suitability, measured according to ISO 14644-14: Class 4 according to ISO 14644-1
Storage temperature: -10 °C...40 °C
Temperature of medium: -10 °C...60 °C
Nominal tightening torque: 3.5 Nm
Tolerance for nominal tightening torque: ±20%
Product weight: 19.5 g
Seals material: NBR
Hollow bolt material: Wrought aluminum alloy | Anodized
Releasing ring material: POM
Material of adjusting screw: PA-reinforced
Swivel joint material: Die-cast zinc

Engineering context

Identification and RFQ Guidance

Confirm the exact configuration

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.

What to include in your RFQ

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 540661. Final compatibility remains subject to the machine manufacturer’s requirements and complete application data.