#
SOLENOID VALVE CONSTRUCTION/OPERATION [JA5AX-EL]

id051705693200

## Duty Type

### Normal high

  • De-energized (OFF) or duty 0%
  - Because the output port (solenoid pressure) and supply port (pilot pressure) connect in the solenoid, the solenoid pressure supplied to the output port.
  • Energized (ON) or duty 100%
  - Because the output port (solenoid pressure) and the drain port connect, solenoid pressure is drained.

.

1 | De-energized (OFF)
2 | Energized (ON)
3 | Output port (solenoid pressure)
4 | Supply port (pilot pressure)
5 | Drain port

### Normal low

  • De-energized (OFF) or duty 0%
  - Because the output port (solenoid pressure) and the drain port connect in the solenoid, the solenoid pressure is drained.
  • Energized (ON) or duty 100%
  - Because the output port (solenoid pressure) and the supply port (pilot pressure) connect in the solenoid, the solenoid pressure supplied to the output port.

.

1 | De-energized (OFF)
2 | Energized (ON)
3 | Output port (solenoid pressure)
4 | Drain port
5 | Supply port (pilot pressure)

## ON/OFF Type (Two-way)

### Normal low

  • De-energized (OFF)
  - The TCM does not apply an electric current to the solenoid valves. The rod moves upward by hydraulic pressure and the drain port opens.
  • Energized (ON)
  - The TCM applies an electric current to the solenoid valves. This excites the coil and forces the rod to move downward to retain hydraulic pressure.

.

1 | OFF
2 | ON
3 | Drain port