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A restriction crossed by an adjustment arrow.
Also known as: Throttle valve symbol, Adjustable restrictor symbol, Speed control valve
In ISO 1219 fluid power diagrams an adjustable flow control is drawn as a restriction with the standard's diagonal adjustment arrow across it, setting the rate of an actuator's movement.
Denotes a restriction whose opening can be adjusted, setting the flow rate and so the actuator speed.
Contexts: Technical drawing
Carries the same diagonal adjustment arrow used on variable pumps and motors, which means adjustable wherever it appears.
Contexts: Technical drawing
A pinched flow line with a long diagonal arrow drawn across the restriction.