An automatic, sensitive, pneumatic pressure controller has been developed for regulating the flow of hydrogen to a bench-scale, high-pressure, hydrogenation unit. It utilizes a 20-turn helical Bourdon tube which is connected to the flapper of a nozzle-flapper combination. When the nozzle is closed, air pressure in the controller acts through a system of bellows and cylinders on a rack which drives a gear connected to the regulating valve. The controller prevents slow drifts of pressure and has operated satisfactorily at 9000 psig pressure.

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