Patent ID: 9581266
Date: 2017-02-28
CPC Classifications: F16K

Claim:
1. A method of operating a valve by means of a valve actuator, characterized in that the method includes the steps of: providing an axial displacement of an actuator spindle by rotating a spindle nut on the actuator spindle by means of at least one driving motor, the spindle nut engaging with an external threaded portion arranged on the actuator spindle and is axially fixed relative to the actuator spindle, thereby compressing an actuator spring via the actuator spindle and a spring plate; keeping the spindle nut connected to a transmission means by providing a coupling with holding current; keeping an actuator spring tightened by providing a brake with holding current; closing the valve automatically by spring return on loss of holding current to the coupling or brake; releasing the valve actuator from the valve by disconnecting the actuator spindle from a valve spindle and disconnecting an actuator housing from a valve housing; and connecting the valve actuator to the valve by locking the actuator housing to the valve housing and connecting the actuator spindle to the valve spindle.