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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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Festo
9857
Air solenoid valve MFH-3-1/2
The Festo 9857 is a 3/2-way closed, monostable industrial component featuring a piloted, plate seat structural design with a soft sealing principle and negative overlap lap. It delivers a normal nominal flow rate of 3700 l/min through G1/2 pneumatic working ports, operating within a pressure range of 0.15 MPa to 0.8 MPa (1.5 bar to 8 bar) with electrical actuation via a separately ordered solenoid coil. This IP65-rated unit includes an adjustable exhaust air function, a detenting manual override, mechanical spring reset, and c UL us (OL) certification for any mounting position. Submit the exact part number, quantity, and application requirements to request a quote for this component.
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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
- 9857
- Data verification
- Manufacturer evidence reviewed
For a faster response, include quantity, condition, and delivery destination.
Exact part-number verificationTechnical properties are matched to 9857.
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
- 3/2-way, closed, monostable
- Actuation type
- Electrical
- Width
- 52 mm
- Normal nominal ow rate (normalized to DIN 1343)
- 3700 l/min
- Pneumatic working port
- G1/2
- Operating voltage
- Via solenoid coil, to be ordered separately
- Operating pressure
- 0.15 MPa...0.8 MPa | 1.5 bar...8 bar
- Structural design
- Plate seat
- Reset method
- Mechanical spring
- Certication
- c UL us - recognized (OL)
- Degree of protection
- IP65
- Nominal width
- 14 mm
- Width dimension
- 69 mm
- Exhaust air function
- Adjustable
- Sealing principle
- Soft
- Mounting position
- Any
- Manual override
- Detenting
- Type of control
- Piloted
- Flow direction
- Non-reversible
- Lap
- Negative overlap
- b-value
- 0.3
- Switching time off
- 90 ms
- On switching time
- 18 ms
- Max. positive test pulse with 0 signal
- 2200 µs
- Max. negative test pulse on 1 signal
- 3700 µs
- Coil characteristics
- See solenoid coil, to be ordered separately
- 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)
- Corrosion resistance class (CRC)
- 1 - Low corrosion stress
- LABS (PWIS) conformity
- VDMA24364-B1/B2-L
- Storage temperature
- -20 °C...60 °C
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 9857. Final compatibility remains subject to the machine manufacturer’s requirements and complete application data.