The scenario
A 24 VDC safety relay circuit holds in a hydraulic press directional valve only while the E-stop chain is closed and reset is pressed; it drops out on any E-stop or loss of control power.
What is in this drawing
Read the decisions behind it.
01
Use an NC emergency stop in series with the start PB and safety relay coil
02
Add a seal-in NO contact across the reset PB so the valve remains energized after release
03
Use a separate NO safety relay contact in series with the solenoid valve load
Reuse this pattern for any single-solenoid hydraulic directional valve controlled by a safety relay with monitored E-stop and manual reset.
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