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In engineering, a fail-safe is a design feature or practice that in the event of a specific type of failure, inherently responds in a way that will cause no or minimal harm to other equipment, the environment or to people. Unlike inherent safety to a particular hazard, a system being "fail-safe" does not mean that failure is impossible or improbable, but rather that the system's design prevents or mitigates unsafe consequences of the system's failure. That is, if and when a "fail-safe" system fails, it remains at least as safe as it was before the failure. Since many types of failure are possible, failure mode and effects analysis is used to examine failure situations and recommend safety design and procedures.
Actuator assembly with a fail safe mechanism
The invention relates to an actuator assembly (200, 300, 600, 700) for connection to an apparatus (101) comprising a body and a central passageway (202, 302, 602, 702) extending along a longitudinal axis of the body, wherein the actuator assembly comprises: - a sliding stem (207, 307, 607, 707), - an obstructing member (201, 301, 601, 701), fixedly attached to the sliding stem (207, 307, 607), - a first compartment (403, 403', 603, 703, 703'), a second compartment (404, 404', 604, 704, 704') and a third compartment (513, 513', 611, 711) having varying volumes depending on the position of the sliding stem (207, 307, 607, 707), wherein the volume of the first compartment (403, 403', 603, 703, 703') increases and the volume of the second compartment (404, 404', 604, 704, 704') decreases when the sliding stem (207, 307, 607, 707) slides in one direction, and the volume of the first compartment (403, 403', 603, 703, 703') decreases and the volume of the second compartment (404, 404', 604, 704, 704') increases when the sliding stem (207, 307, 607, 707) slides in another opposite direction.
Owner:TOTALENERGIES ONETECH