Product Description
The Festo VOFD is a directly controlled pilot valve engineered for particularly demanding operating conditions in process automation, specifically for the chemical and petrochemical industries . Featuring a redundant version certified for safety-related systems up to SIL3 (IEC 61508), this valve is suitable for outdoor use under harsh, dusty ambient conditions and is especially suited for quarter-turn actuators thanks to its NAMUR flange pattern .
Key Features & Advantages:
Safety Integration up to SIL3: Redundant version with TÜV approval for safety-related systems up to SIL3 according to IEC 61508 . Suitable for emergency shutdown (ESD) applications and safety-critical control loops, with variants featuring safe venting function .
NAMUR Flange Pattern: Standardized NAMUR flange pattern (VDI/VDE 3845) allows direct mounting to quarter-turn actuators, eliminating additional brackets and tubing .
Ematal-Coated Aluminium Housing: The valve housing features an Ematal coating, converting the aluminium surface into a very hard aluminium oxide layer with titanium oxide intercalations, providing extreme wear and abrasion resistance and optimum protection against atmospheric and chemical influences .
ATEX Explosion Protection: Available in variants compliant with EU Explosion Protection Directive (ATEX), including Zone 1, Zone 2, Zone 21, and Zone 22 certifications for hazardous area installations .
One Valve, Two Connection Options: Features both NAMUR port pattern for direct actuator installation and G and NPT threaded connections, reducing inventory requirements .
Flexible Manual Override: Manual override can be ordered optionally, and can be retrofitted or removed after installation—no additional valve version required .
Spring Chamber Breather Function: The integrated spring chamber breather function protects single-acting quarter-turn actuators (spring return cylinders/actuators) against contaminated ambient air and weather influences such as rain .
Technical Specifications:
| Specification | VOFD-L12T Series | VOFD-L50T Series |
|---|---|---|
| Brand | Festo | Festo |
| Series | VOFD | VOFD |
| Valve Function | 3/2-way, normally closed, monostable | 3/2-way, normally closed, monostable |
| Actuation Type | Directly controlled pilot valve / Poppet valve | Electric |
| Standard Nominal Flow Rate | 52 L/min | 493 L/min |
| Operating Pressure Range | 0 – 8 bar (0 – 116 psi) | 0 – 10 bar (0 – 145 psi) |
| Maximum Operating Pressure | 8 bar | 10 bar |
| Port Size | G1/4" | G1/4" |
| Thread Type | G (BSPP) | G |
| Number of Ports | 3 | 3 |
| Number of Positions | 2 | 2 |
| Valve Width | 50 mm | 51 mm |
| Design | Poppet valve | - |
| Reset Method | Mechanical spring | - |
| Seal Material | Nitrile rubber (NBR) | Nitrile rubber (NBR) |
| Body Material | Ematal-coated aluminium | Ematal-coated aluminium |
| Minimum Operating Temperature | -25°C | -25°C |
| Maximum Operating Temperature | 60°C | 60°C |
| Protection Class | IP65 (typical) | IP65 (typical) |
| NAMUR Mounting Pattern | VDI/VDE 3845 (available) | VDI/VDE 3845 (available) |
| ATEX Certification | Zone 1, 2, 21, 22 | - |
| Safety Certification | TÜV SIL3 (IEC 61508) | TÜV SIL3 (IEC 61508) |
| Corrosion Resistance | Ematal coating – High | Ematal coating – High |
| Manual Override | Optional/Retrofittable | - |
Comparison: VOFD vs. VOFC:
| Feature | VOFD | VOFC |
|---|---|---|
| Control Type | Directly controlled pilot valve | Indirectly controlled pilot valve |
| Typical Flow Rate (3/2 NC) | 52 – 493 L/min | 601 – 3,462 L/min |
| Operating Pressure Range | 0 – 8 / 0 – 10 bar | 3 – 8 bar |
| Minimum Operating Pressure | 0 bar (no minimum) | 3 bar (requires minimum pilot pressure) |
| Typical Application | Pilot control of butterfly valves and actuators | Actuation of larger process valves |
| Width | 50 – 51 mm | 51 mm |
| Both SIL3 & ATEX | Yes | Yes |
Ideal For:
Process automation in chemical and petrochemical industries, oil and gas facilities, pharmaceutical manufacturing, hazardous area installations (ATEX Zone 1/2/21/22), emergency shutdown (ESD) applications , quarter-turn butterfly valve and actuator control, outdoor installations exposed to dust, rain, and harsh ambient conditions , spring return (single-acting) actuator applications requiring spring chamber breather protection , and safety-related control systems up to SIL3.
Why Choose FESTO VOFD?
Choose the Festo VOFD for its TÜV-certified SIL3 safety design, directly controlled operation requiring no minimum pilot pressure (operates from 0 bar), Ematal-coated aluminium housing for extreme corrosion resistance, ATEX Zone 1/2/21/22 certification, and integrated spring chamber breather function—delivering process-safe, reliable pilot control for demanding Malaysian chemical, petrochemical, and hazardous location applications.
Tags:
#Festo #VOFD #SolenoidValve #NAMURValve #SIL3 #ATEX #ProcessAutomation #PilotValve #HazardousLocation #QuarterTurnActuator #MalaysiaSupplier
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