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.
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Festo
173666
Pressure regulator LR-3/4-D-7-MIDI-NPT
The Festo part number 173666 is a Midi size industrial component from the D series featuring a constant output pressure controller function with a regulation range of 0.5 bar to 7 bar and a maximum operating pressure of 16 bar. This unit delivers a normal nominal flow rate of 4500 l/min through 3/4 NPT pneumatic connections on both ports and operates within a temperature range of -10 °C to 60 °C for both the ambient environment and the medium. It supports flexible installation via front panel mounting, in-line installation, or a retaining bracket while offering moderate corrosion resistance and compatibility with compressed air or inert gases. Submit the exact part number, quantity, and application requirements to receive a formal quotation.
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Request a QuoteWhy 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
- 173666
- Data verification
- Manufacturer evidence reviewed
For a faster response, include quantity, condition, and delivery destination.
Exact part-number verificationTechnical properties are matched to 173666.
Worldwide sourcingSupport for planned and urgent industrial requirements.
Manufacturer documentationA document is added when the reviewed source provides one.
Verified configuration
Technical Specifications
- Size
- Midi
- Series
- D
- Mounting position
- Any
- Controller function
- Constant output pressure
- Operating pressure
- 1.6 MPa | 16 bar
- Pressure regulation range
- 0.5 bar...7 bar
- Max. pressure hysteresis
- 0.02 MPa | 0.2 bar | 2.9 psi
- Normal nominal ow rate (normalized to DIN 1343)
- 4500 l/min
- Operating medium
- Compressed air as per ISO 8573-1:2010 [7:4:4] | Inert gases
- Information on operating and pilot media
- Operation with oil lubrication possible (required for further use)
- Corrosion resistance class (CRC)
- 2 - Moderate corrosion stress
- LABS (PWIS) conformity
- VDMA24364-B1/B2-L
- Air quality class at the output
- Compressed air as per ISO 8573-1:2010 [7:4:4] | Inert gases
- Temperature of medium
- -10 °C...60 °C
- Ambient temperature
- -10 °C...60 °C
- Product weight
- 720 g
- Type of mounting
- Alternatively: | Front panel mounting | In-line installation | With retaining bracket
- Pneumatic connection 1
- 3/4 NPT
- Pneumatic connection 2
- 3/4 NPT
- Note on materials
- RoHS compliant
- Seals material
- NBR
- Housing material
- Die-cast zinc
Engineering context
Identification and RFQ Guidance
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 173666. Final compatibility remains subject to the machine manufacturer’s requirements and complete application data.