Festo Magnet Valve Corr. Lely 9.1138.0821.4

Festo Magnet Valve for Cord Cylinder & Tube Clincher (Lely A3 & A4)

The Festo Magnet Valve (557649) is a high-precision pneumatic component used within the control manifold of the Lely Astronaut. This specific valve is responsible for regulating the air pressure to the cord cylinders (responsible for retracting the teat cups) and the tube clincher/sleeves (responsible for shutting off vacuum/milk flow).

Product Identification

Key Applications

• Cord Cylinder Control: Manages the smooth retraction of the teat cups back to the arm or storage rack after milking is complete.
• Tube Clincher / Sleeves: Operates the mechanical "pinch" or sleeve mechanism that instantly stops vacuum flow, preventing manure or air from being sucked into the milk line during detachment.
• Manifold Integration: Designed to fit into the modular Festo valve terminals found in the A3 and A4 robot cabinets.

Technical Features

• High-Speed Switching: Engineered for the rapid "fire" movements required during the detachment phase of the milking cycle.
• Environmental Resistance: Built to Festo's industrial standards to withstand the high humidity and temperature fluctuations of a dairy barn.
• Reliable Sealing: Internal spool design prevents internal air leakage, ensuring the cord cylinders maintain consistent tension.
• 24V DC Operation: Fully compatible with the Lely robot's standard control voltage.

Maintenance Insight

If you notice that teat cups are not retracting fully or if the vacuum is not cutting off cleanly (leading to "hissing" at the teat cup after detachment), this magnet valve is likely sticking or has worn internal seals.

• Tip: When replacing the 9.1138.0821.4 valve, inspect the small silencers on the exhaust ports. If they are clogged with dust or moisture, it can create back-pressure that prevents the valve from shifting correctly.