Actuator Device Having An Open/Close Valve

An actuator device comprising:

• an open/close valve;
• an actuating element acting on the open/close valve;
• a pneumatic actuating drive configured to adjust the open/close valve using the actuating element acting on the open/close valve;
• a position sensor configured to record an actual position of the actuating element;
• an electropneumatic position controller supplied with compressed air from a feed air inlet, the electropneumatic position controller generating an actuating pressure at an actuating pressure outlet as a function of the actual position and a setpoint position;
• an activated solenoid valve configured to supply the actuating pressure to the actuating drive, the activated solenoid valve being supplied with a supply voltage to be activated, and the activated solenoid valve being deactivatable in an emergency by switching off the supply voltage to vent the actuating drive;
• at least one of a position limit value sensor, operable by the actuating element, and a pressure limit value sensor, configured to records the actuating pressure at the solenoid valve;
• and
• a controllable valve arrangement between the feed air inlet of the electropneumatic position controller and the activated solenoid valve;
• wherein the controllable valve arrangement is actuated by the at least one of the position limit value sensor and the pressure limit value sensor to connect the solenoid valve directly to the feed air when the position limit value sensor detects one of a pre-specified movement position of the actuating element has been reached and the pressure limit value sensor detects that a pre-specified minimum pressure has been undershot.

An actuator device comprising:

• an open/close valve;
• an actuating element acting on the open/close valve;
• a pneumatic actuating drive configured to adjust the open/close valve using the actuating element acting on the open/close valve;
• a position sensor configured to record an actual position of the actuating element;
• an electropneumatic position controller supplied with compressed air from a feed air inlet, the electropneumatic position controller generating an actuating pressure at an actuating pressure outlet as a function of the actual position and a setpoint position, the electropneumatic position controller being directly connected to the pneumatic actuating drive without an intermediate connection of a solenoid valve, connected at a power supply end to a supply voltage of a power supply and being configured to vent the actuating drive if the power supply fails;
• at least one of a position limit value sensor operable by the actuating element and a pressure limit value sensor configured to records the actuating pressure at the solenoid valve;
• a valve arrangement between a feed air inlet of the electropneumatic position controller and the actuating drive, the valve arrangement being electrically activateable, the valve arrangement connecting the actuating drive to an actuating pressure outlet in a passive state and connecting the actuating drive directly to the feed air in an active state, and being actuated by the at least one of the position limit value sensor and the pressure limit value sensor;
• wherein the position and pressure limit value sensors each comprise a limit value switch which connect the valve arrangement to the supply voltage and which closes when one of the actuating element reaches a pre-specified movement position and the recorded actuating pressure falls below a pre-specified minimum pressure.