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Public-images-osm logo.svg actuator = hydraulic_cylinder
Hydroelectric ball valve hydraulic actuator.jpg
A hydraulic cylinder changes the state of a machine or device Edit or translate this description.
Group: Man made
Used on these elements
may be used on nodesmay be used on waysmay be used on areasshould not be used on relations
Useful combination
Status: approvedPage for proposal

A hydraulic cylinder is a linear mechanical actuator designed to deliver unidirectional force to a moving part of a system. It runs with a not compressible liquid fluid like oil instead of pneumatic cylinders (actuator=pneumatic_cylinder) which make use of compressed air.

This key was initially proposed to describe pipeline=valve but it is suitable for movable road bollards, automatic doors or any moving system also.