534665

Name: Festo 534665 One-way flow control valve GRLA-3/8-QB-5/16-U
Brand: Festo

One-way flow control valve GRLA-3/8-QB-5/16-U

The Festo 534665 is an industrial component featuring an exhaust air flow control non-return function with a QB-5/16 pneumatic connection 1 and a 3/8 NPT pneumatic connection 2. This manually actuated screw-in unit utilizes a slotted screw adjusting element, nickel-plated brass screwed plug material, and operates within an ambient and medium temperature range of 32 °F to 140 °F. It delivers a standard nominal flow rate of 126 cfm in the flow control direction and 97.2 cfm to 129 cfm in the non-return direction at an operating pressure spanning -13.8 psi to 116 psi. Submit the exact part number, quantity, and application requirements to request a quote for this item.

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: 534665
Data verification: Manufacturer evidence reviewed

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

Exact part-number verificationTechnical properties are matched to 534665.

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: QB-5/16
Pneumatic connection 2: 3/8 NPT
Actuation type: Manual
Adjusting element: Slotted screw
Type of mounting: Screw-in | With external thread
Standard nominal ow rate in ow control direction: 126 cfm
Standard nominal ow rate in non-return direction: 97.2 cfm...129 cfm
Ambient temperature: 32 °F...140 °F
Mounting position: Any
Operating pressure for entire temperature range: -13.8 psi...116 psi
Standard ow rate in ow control direction 6 -> 0 bar: 195 cfm
Standard ow rate in non-return direction at 6 -> 0 bar: 195 cfm...203 cfm
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 Zone III
Temperature of medium: 32 °F...140 °F
Max. tightening torque: 16.2 ft-lbf
Product weight: 2.46 oz
Material of screwed plug: Brass | Nickel-plated
Note on materials: RoHS compliant
Seals material: NBR
Hollow bolt material: Brass | Nickel-plated
Releasing ring material: POM

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 534665. Final compatibility remains subject to the machine manufacturer’s requirements and complete application data.