DIAGNOSTIC EQUIPMENT FOR VALVE ACTION AND DIAGNOSTIC METHODS FOR VALVE ACTION USED WITH THIS EQUIPMENT

Abstract

The invention refers to the device (10) for diagnosing the valve actuation of the valve actuation device (15), the valve actuation device (15) which causes the body casing (12) to be screwed tightly onto the body (11) to rotate as the motor (13) is operated by alternating current supplied to the motor, thereby causing the valve component (14) to move together with the body (11) along the axis of the body (11), and the valve actuation diagnostic device includes: a current detection device (26) which continuously or intermittently measures the current values ​​supplied to the motor (13);and arithmetic manipulation means (27) which derives the time interval of the motor start-up (13) until the valve component (14) and body (11) begin to move, based on the increase and decrease, with respect to the time axis, of the average of the absolute values ​​of the current values ​​measured by the current detection method (26) over a predetermined time length or the average of the values ​​corresponding to the absolute values.;