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.
Global industrial sourcing · Houston, Texas info@mropartsrfq.com
Reference imageConfirm configuration by manufacturer part number.
Festo
173921
On/off valve HEL-3/4-D-MIDI-NPT
Engineered by Festo with part number 173921, this direct-controlled pneumatic industrial component features a 55 mm width and a 2/2-way, closed, monostable piston gate valve structural design with a mechanical spring reset method and non-reversible flow direction. The unit operates within a pressure range of 0.3 MPa to 1.6 MPa (3 bar to 16 bar) utilizing compressed air per ISO 8573-1:2010 [7:4:4] or inert gases, delivering a normal nominal flow rate of 3800 l/min with an adjustable exhaust air function, soft sealing principle, and any mounting position. Featuring a C value of 20.5 l/sbar, a b-value of 0.48, and a moderate corrosion resistance class (CRC) of 2, it allows for oil lubrication operation which is required for further use. Submit the exact part number, quantity, and application requirements to receive a formal quotation.
Request pricing and availabilityCommercial response within one business day for your destination and required quantity.
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
- 173921
- Data verification
- Manufacturer evidence reviewed
For a faster response, include quantity, condition, and delivery destination.
Exact part-number verificationTechnical properties are matched to 173921.
Worldwide sourcingSupport for planned and urgent industrial requirements.
Manufacturer documentationA document is added when the reviewed source provides one.
Verified configuration
Technical Specifications
- Width dimension
- 55 mm
- Exhaust air function
- Adjustable
- Actuation type
- Pneumatic
- Sealing principle
- Soft
- Mounting position
- Any
- Manual override
- None
- Structural design
- Piston gate valve
- Reset method
- Mechanical spring
- Type of control
- directly
- Flow direction
- Non-reversible
- Valve function
- 2/2-way, closed, monostable
- Operating pressure
- 0.3 MPa...1.6 MPa | 3 bar...16 bar
- b-value
- 0.48
- C value
- 20.5 l/sbar
- Normal nominal ow rate (normalized to DIN 1343)
- 3800 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
- 270 g
- Type of mounting
- In-line installation | With accessories
- Pneumatic connection 1
- 3/4 NPT
- Pneumatic connection 2
- 3/4 NPT
- Note on materials
- RoHS compliant
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 173921. Final compatibility remains subject to the machine manufacturer’s requirements and complete application data.