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A small circle on a stem, tripped by a passing part.
Also known as: Roller lever symbol, Cam roller actuator
In ISO 1219 fluid power diagrams a small circle on a stem drawn against a valve denotes a roller: the valve is tripped mechanically by a moving machine part running over it.
Denotes mechanical actuation by a roller tripped by a passing machine element.
Contexts: Technical drawing
Provides position feedback in a circuit without any electrical sensing, the valve itself detecting that a movement has completed.
Contexts: Technical drawing
A short stem attached to the valve block with a small circle at its free end, representing a roller wheel.