Improvements relating to operating control arrangements for fluidic devices.

摘要

A fluidic device operating arrangement which is especially for the remote control of a fluidic device in potentially explosive or electrically vulnerable environments comprises optical signal generating means and transducer means for converting the output derived from the optical signal generating means into a mechanical output either directly or through the intervention of further means to produce the requisite flow of operating fluid in the device for the operation thereof. The transducer means may comprise a gas-filled light transmissive vessel which contains a small volume of fibrous material which undergoes very rapid heating and produces consequential expansion of the vessel walls for generating a mechanical pressure pulse which can be transmitted to the operating fluid fed to one or more control ports of the associated fluidic device.