Fixed flow restrictor VFFG

Product Description
The Festo VFFG series fixed flow restrictors are precision pneumatic components designed to provide a constant, tamper-proof restriction in compressed air circuits. Unlike adjustable flow control valves, the VFFG features a fixed orifice that cannot be altered after installation, ensuring consistent actuator speed regardless of operator interference or vibration . These restrictors are used to decelerate pneumatic cylinders, limit flow rates, or create pressure drops in critical applications where repeatability is essential. Available with M5 threaded ports or push-in fittings for 4 mm, 5.8 mm, and 6 mm tubing, the VFFG series offers a wide range of nominal diameters from 0.55 mm to 1.55 mm to match precise speed requirements .

Key Features & Advantages

• Tamper-Proof Fixed Restriction: The calibrated, non-adjustable orifice ensures that once the actuator speed is set during commissioning, it cannot be inadvertently changed by operators, enhancing process reliability and safety . The restrictor is installed directly in the fitting or screwed into the cylinder port .

• Wide Operating Pressure Range: Operates reliably from -0.9 bar vacuum up to 10 bar positive pressure, making it suitable for both vacuum gripping applications and standard pneumatic systems .

• Broad Temperature Range: Functions in ambient temperatures from -5°C to 60°C, with storage temperatures from -10°C to 60°C, ensuring consistent performance across diverse industrial environments .

• Multiple Orifice Sizes for Precision Tuning: Available with nominal widths from 0.55 mm (VFFG-T-F4-5) up to 1.55 mm (VFFG-T-F4-15) . M5 threaded versions offer standard nominal flow rates up to 45.4 l/min, with b values and C values specified for precise engineering calculations .

• High Chemical Resistance: Constructed with RoHS-compliant materials; hollow bolts are made from durable PA (polyamide), ensuring long service life in industrial environments .

• Excellent Corrosion Protection: Rated up to Corrosion Resistance Class (CRC) 4 for variants with grooved mounting (VFFG-T-F4/F6 series), providing protection against particularly high corrosion stress for demanding environments .

• LABS (PWIS) Conformity: Complies with VDMA24364-B1/B2-L standards for paint-wetting impairment substances, making these restrictors suitable for paint shop environments and applications sensitive to paint defects .

• Compact and Lightweight: Weighing as little as 0.4 g to 1.2 g per piece, these restrictors add negligible mass to valve assemblies, ideal for lightweight automation components .

• Plug-and-Play Installation: Features tapped (threaded) or grooved mounting types. M5 versions screw directly into valve ports, while F4/F6 versions push into the fitting. The hollow bolt design ensures secure sealing .

• Mounting Type Options: Tapped mounting for M5 threaded versions (VFFG-T-M5-...) for direct installation into ports . Grooved mounting for F4/F6 push-in versions (VFFG-T-F4/6-...) for integration into push-in fittings .

• Enhanced Safety Certification: c UL us - Recognized (OL) certification for select variants, ensuring compliance with North American safety standards for industrial control equipment .

• Globally Approved: RoHS compliant, meeting stringent environmental regulations for restricted hazardous substances .

• Maintenance-Free Operation: Designed for non-lubricated operation, though lubrication is permissible if required for the overall system (lubricated operation then required for further use) .

Technical Specifications

Brand: Festo

Model Series: VFFG

Product Numbers:

• VFFG-T-F4-5 (8047346) – 0.55 mm, for 4 mm tubing

• VFFG-T-F4-6 (8047347) – 0.6 mm, for 4 mm tubing

• VFFG-T-F4-7 (8047348) – 0.7 mm, for 4 mm tubing

• VFFG-T-F4-8 (8047349) – 0.85 mm, for 4 mm tubing

• VFFG-T-F4-10 (8047350) – 1.05 mm, for 4 mm tubing

• VFFG-T-F4-12 (8047351) – 1.2 mm, for 4 mm tubing

• VFFG-T-F4-15 (8047352) – 1.55 mm, for 4 mm tubing

• VFFG-T-M5-5 (8025708) – 0.55 mm, M5 thread

• VFFG-T-M5-6 (8025710) – 0.6 mm, M5 thread

• VFFG-T-M5-7 (8025711) – 0.7 mm, M5 thread

• VFFG-T-M5-8 (8025712) – 0.85 mm, M5 thread

• VFFG-T-M5-10 (8025713) – 1.05 mm, M5 thread

• VFFG-T-M5-12 (8025714) – 1.2 mm, M5 thread

• VFFG-T-M5-15 (8025715) – 1.55 mm, M5 thread

• VFFG-T-F6-7 (8047353) – 0.7 mm, for 5.8 mm tubing

• VFFG-T-F6-8 – for 5.8 mm tubing

• VFFG-T-F6-10 – for 5.8 mm tubing

Product Type: Fixed Flow Restrictor / Throttle Valve

Valve Function: Throttle function / Flow control function

Nominal Width: 0.55 mm to 1.55 mm (variant dependent) 

Standard Nominal Flow Rate: Up to 45.4 l/min (M5 threaded variants) 

Operating Pressure: -0.9 bar to 10 bar (-0.09 MPa to 1 MPa, -13 psi to 145 psi) 

Operating Medium: Compressed air to ISO 8573-1:2010 [7:4:4] 

Media Note: Operation with oil lubrication possible (required for further use thereafter); non-lubricated operation is permissible 

Corrosion Resistance Class (CRC): 2 to 4 (variant dependent)

LABS (PWIS) Conformity: VDMA24364-B1/B2-L 

Ambient Temperature: -5°C to 60°C 

Storage Temperature: -10°C to 60°C 

Type of Mounting: Tapped (M5 threaded) or Grooved (push-in for tubing) 

Product Weight: 0.4 g to 9.6 g (variant dependent) 

Pack Size: 10 pieces per pack (standard) 

Note on Materials: RoHS-compliant 

Hollow Bolt Material: PA (Polyamide) 

Identification Code (Type Code)

• VFFG – Fixed flow restrictor

• T – Type code

• F4 – For tubing outer diameter 4 mm (push-in connection)

• F6 – For tubing outer diameter 5.8 mm (push-in connection)

• M5 – M5 threaded connection (screws into port)

• X – Nominal width (5, 6, 7, 8, 10, 12, 15 representing 0.55, 0.6, 0.7, 0.85, 1.05, 1.2, 1.55 mm respectively)

Ideal For

Pneumatic systems requiring fixed, non-adjustable flow restriction, cylinder speed control in tamper-proof applications, vacuum handling systems requiring controlled flow, paint shop environments requiring LABS conformity, outdoor and marine applications requiring high corrosion resistance (CRC 4 variants), space-constrained installations requiring ultra-compact components, and safety-critical applications where operator adjustment must be prevented.

Why Choose Festo VFFG Series Fixed Flow Restrictor

Choose the Festo VFFG series for its tamper-proof fixed orifice design that ensures consistent actuator speed and process reliability, eliminating the risk of unauthorised or accidental adjustment . Featuring a wide -0.9 to 10 bar operating pressure range for both vacuum and positive pressure applications, broad -5°C to 60°C temperature range, multiple nominal width options from 0.55 mm to 1.55 mm for precise flow tuning , M5 threaded (VFFG-T-M5) or push-in (VFFG-T-F4/F6) connection options, LABS conformity for paint shop applications (VDMA24364-B1/B2-L), high corrosion resistance up to CRC 4 for demanding environments, compact and lightweight design (0.4-9.6 g) , c UL us certification for select variants ensuring North American safety compliance, RoHS compliance for environmental standards, maintenance-free non-lubricated operation, and German engineering quality. This fixed flow restrictor series delivers reliable, precise, and tamper-proof flow control for demanding industrial automation applications.

Tags

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