Loading patent…
AssigneeVoith Patent GmbH
InventorHubert Schaber
Estimating the term…
An actuating drive for a control valve contains a working cylinder which has a piston and a piston rod and forms an actuator for the control valve. The piston bounds a first pressure space and a second pressure space to displace the piston counter to the force of a spring by applying pressure to the first pressure space via a working medium. A working medium circuit is connected to the working cylinder at first and second pressure connections to introduce and evacuate the working medium into/from the first and second pressure spaces. The working medium circuit has a working medium pump connected to convey the working fluid, at a pressure side, to the first pressure connection, and at a suction side, to the second pressure connection. The first pressure space is permanently connected, so as to convey working fluid, to the second pressure space via a bypass line.
An actuating drive for a regulation valve, comprising:
A method for operating an actuating drive for a regulation valve, the actuating drive containing a working cylinder, a spring and a piston having a piston rod disposed in the working cylinder, the piston rod forming an actuator for the regulation valve, the piston delimiting a first pressure chamber with a first pressure port and a second pressure chamber with a second pressure port, for displacing the piston with the piston rod counter to a force of the spring assigned to the working cylinder by pressurization of the first pressure chamber by introduction of a pressurized working medium via the first pressure port, the actuating drive further having an external working medium circuit to which the working cylinder is connected by means of the first and second pressure ports for introducing the pressurized working medium into, or discharging the pressurized working medium from, the first and second pressure chambers, the external working medium circuit having a tank line, a pressure line, a motor and a working medium pump driven by means of the motor, the working medium pump having a suction side and a pressure side and is, by means of the pressure side, connected in a working-medium-conducting fashion via the pressure line to the first pressure port and is, by means of the suction side, connected via the tank line to the second pressure port, the first pressure chamber being permanently connected in permanent fluid communication with the second pressure chamber via said short-circuit line, which comprises the step of:
Dependencies are inferred from the claim text.