https://mhlimon.com/tags/pneumatic/Recent content in Pneumatic on MH Limonhttps://mhlimon.com/images/og-image.pnghttps://mhlimon.com/images/og-image.pngHugoenMon, 19 Oct 2026 15:43:25 +0600https://mhlimon.com/notes/field-notes/2026-10-08-instrument-air-dryer/Thu, 08 Oct 2026 00:00:00 +0000https://mhlimon.com/notes/field-notes/2026-10-08-instrument-air-dryer/<p>We investigated an instrument-air compressor and dryer system where the compressor, dryer regeneration, drain valves, and pressure control were not operating as expected.</p> <p>Initial symptoms included:</p> <ul> <li>Dryer not regenerating properly</li> <li>Water accumulating in the air system</li> <li>Drain valves not operating correctly</li> <li>Instrument-air leakage</li> <li>Compressor pressure cycling abnormally</li> </ul> <p>Initial hypotheses included:</p> <ul> <li>Faulty solenoid valves</li> <li>Actuator problem</li> <li>Instrument-air leakage</li> <li>Pressure switch problem</li> <li>Electrical cable fault</li> <li>Incorrect sequence timing</li> </ul> <p>During investigation, several individual faults were found.</p>https://mhlimon.com/notes/field-notes/2026-10-07-solenoid-valve/Wed, 07 Oct 2026 00:00:00 +0000https://mhlimon.com/notes/field-notes/2026-10-07-solenoid-valve/<p>During troubleshooting of a pneumatic dryer system, several solenoid valves were investigated because the expected valve operation was not occurring.</p> <p>The first electrical check was coil resistance.</p> <p>Most coils showed approximately 300 ohms, which initially indicated that the coils were electrically intact.</p> <p>However, resistance measurement alone could not confirm that the complete solenoid valve was functioning correctly.</p> <p>The valve inputs and outputs were then checked by applying the control voltage and observing the actual valve state.</p>