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US 3,941,148 AGranted
Control valve drive
AssigneeSun Oil Company of Pennsylvania
InventorJulius Lerner
Life of this patent
Estimating the term…
Abstract
A system for controlling a pneumatic rising stem valve by a stepping motor is disclosed. A pressure regulator is connected to the stepping motor so that the air pressure applied to the valve can be varied according to the signals applied to the stepping motor.
Claims3
An apparatus for automatically controlling a pneumatic valve located in a conduit having fluid flowing inside, and comprising:
- a. pneumatic valving means connected to the conduit;
- b. a source of compressed air for actuating the pneumatic valving means;
- c. means for measuring the flow rate of fluid in the conduit and for producing a feedback signal indicating the flow rate;
- d. means for producing a command signal indicating the flow rate desired in the conduit;
- e. means for receiving the command and feedback signals and for producing a control signal to control the valving means;
- and
- f. means, in communication with the source of compressed air and the valving means, for varying the air pressure supplied to the valving means in response to the control signal produced by the control system.
4 more elements
Dependencies are inferred from the claim text.