US 12,031,639 B2 · Universal logic circuit for electro-hydraulic actuator

Abstract

Universal control circuitry for an electro-hydraulic valve actuator system includes logic gate circuitry to control one or more of a closing solenoid valve, an opening solenoid valve, an emergency shutdown solenoid valve, and a hydraulic fluid pump motor to route hydraulic fluid through a hydraulic circuit to actuate a valve via a hydraulic actuator according to received commands. The universal control circuitry is configured to control operation for multiple different configurations of a hydraulic valve actuator system including double-acting configurations, single-acting spring-to-open configurations, and single-acting spring-to-close configurations, each with or without an emergency shutdown arrangement (which may be configured to trip based on an external shutdown input alone or in combination with a local system power failure), a hydraulic accumulator, and maintained or momentary input commands.

Claims20

Dependent claims

Control circuitry for a system that comprises a hydraulic valve actuator, comprising:

one or more input channels that are each configured to receive an operational command;
one or more user-selectable inputs that are representative of a configuration of the hydraulic valve actuator, the one or more user-selectable inputs comprising one or more inputs to indicate whether the hydraulic valve actuator is configured as spring-to-open or spring-to-close;
a motor output that is configured to cause a motor that is coupled to a hydraulic fluid pump to run;
one or more valve outputs that are each configured to control an open or closed state of an associated valve, wherein each of the one or more valves is configured to control a flow of hydraulic fluid within the system;
and
a plurality of physical logic gates that are responsive to at least signals received at the one or more input channels and the one or more user-selectable inputs to determine a state of the motor output and the one or more valve outputs.

3 more elements

Dependencies are inferred from the claim text.

Universal logic circuit for electro-hydraulic actuator

Life of this patent

Universal logic circuit for electro-hydraulic actuator

Life of this patent

Abstract

Claims20