Proportional vs. Servo Valves: When You Need Closed-Loop Hydraulic Control
Proportional vs. servo valves on heavy hydraulic axes: spool feedback, hysteresis, bandwidth, hydraulic natural frequency, cleanliness, and PLC loop closure.
Closed-Loop Hydraulic Position and Force Control Integrated with a PLC
Closing hydraulic position and force loops with a PLC: where each loop runs, force feedback, position-to-force changeover, sizing, and EtherNet/IP data.
Fluid Cleanliness (ISO 4406) for Proportional and Servo Valves
How ISO 4406 cleanliness codes are built and read, what valve and filter suppliers publish for proportional and servo valves, and how to flush and monitor.
Reading Hydraulic and Pneumatic Schematics (ISO 1219 Symbols)
How to read hydraulic and pneumatic circuit diagrams: what ISO 1219 Parts 1-3 cover, valve and port labels, accumulators, sensors, and what to require.
Hydraulic Efficiency: Variable-Speed Pumps, Load Sensing, and Accumulators
Where hydraulic energy is lost and what variable-speed pumps, load-sensing compensators, regeneration, and accumulators recover, and how strong the evidence is.