Normally High - Linear Solenoids

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Fig 1: Normally Low - Linear Solenoid

Courtesy of GENERAL MOTORS COMPANY

A normally high linear solenoid actuator is an electro-mechanical device that converts electrical power into a mechanic pushing or pulling force or motion.
When energized, the solenoid armature applies force to the face of a pressure regulating spool valve.
The solenoid actuator applies maximum force with minimum current applied to the solenoid coil.
The solenoid actuator applies minimum force with maximum current applied to the solenoid coil.
Transmission control solenoid valves 1 and 6 are normally high.