AD-SL231D-508E-DA3 Pneumatic Double Solenoid Valve | Ross Style Safety Valve | AD-04104FK-D2

LIC Hydraulic proudly presents the AD Series Pneumatic Double Solenoid Valves, the industry standard for fail-safe control in heavy-duty pneumatic systems. Specifically designed for clutch and brake control on mechanical presses, models like the AD-SL231D-508E-DA3 feature a dual-redundant valve architecture. This “Double Valve” design ensures that if one element malfunctions, the valve will still safely exhaust the downstream pressure, preventing accidental machine strokes. Our AD series provides 100% original interchangeability and undergoes 1,000,000+ cycle reliability testing to guarantee the highest safety integrity for your facility.

Technical Specifications

• Key Models: AD-SL231D-508E-DA3, AD-04104FK-D2, 304D, 508D, 712D

• Port Sizes: Available from 1/4″ up to 1-1/4″ NPT/G

• Operating Media: Filtered, lubricated or non-lubricated compressed air

• Pressure Range: 0.2 MPa to 1.0 MPa (2.0 to 10 bar)

• Voltage Options: 24VDC, 110VAC, 220VAC

• Response Time: ≤ 20ms for both actuation and exhaust

• Safety Monitoring: Integrated electronic or mechanical sensing (DA3 Code)

• Design Standard: Meets high-level industrial safety categories (Cat 3/4)

Key Technical Advantages

• Cross-Mirror Redundancy: The valve utilizes a cross-flow path design where both internal elements must actuate simultaneously. Any asynchronous movement causes the valve to lock out and exhaust pressure, ensuring maximum operator safety.

• High-Speed Response: Engineered for millisecond precision, ensuring that clutch engagement and brake release happen instantly, which is critical for high-speed press operations.

• Dynamic Monitoring (DA3): The integrated sensing system provides real-time feedback to the PLC regarding the position of each valve element, allowing for continuous safety monitoring.

• Wear-Resistant Construction: Features specialized seals and precision-ground internals to withstand millions of cycles without degradation, even in non-lubricated air environments.

Application Areas

• Metal Stamping: Clutch and brake control for mechanical power presses and forging machines.

• Safety Systems: Emergency shut-off circuits for pneumatic shears and heavy industrial actuators.

• Packaging & Assembly: High-speed, high-reliability switching in automated production lines.

Expert Maintenance Tips

• Air Filtration (Critical): Always use a 5-micron filter. Contaminants or excessive water in the air lines can cause the valve elements to move out of sync, triggering a safety lockout.

• Silencer Maintenance: Use high-flow silencers only. A clogged silencer creates backpressure, which can dangerously delay the exhaust time and increase braking distance.

• Regular Synchronization Check: Inspect the valve’s timing every quarter. If the control system detects a discrepancy in switching times, it is time for a professional overhaul or seal kit replacement.