ISOLATION VALVE WITH MOTOR DRIVEN SEALING MECHANISM

摘要

An isolation valve (10) has a housing (11) having a vent path (12) and a sealing member (14) that opens and closes the vent path (12). The scaling member (14) is driven by a motor (16) via a gear arrangement (18) that links the scaling member (14) with the motor (16). The motor (16) drives the gear arrangement (18) in a first direction to open the vent path (12) and a second direction to close the vent path (12). During operation, a motor current rises when the sealing member (14) reaches the first position and/or the second position. The controller (24) detects the motor current rise and changes operation of the motor (16) (e.g., stops the motor (16)) in response.