Patent ID: 11953115
Assignee: BELIMO HOLDING AG
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  G | IPC F  G

Claim 13:
14. An HVAC actuator (1) for moving a valve member (21) of a control valve (2) to regulate a fluid flow through the control valve (2), the HVAC actuator (1) comprising a circuit (11) configured to:
monitor a rotation angle (ϕ) associated with a drive torque (Mdrive) applied by the HVAC actuator (1) for moving the valve member (21);
detect a blocking of the control valve (2), if the applied drive torque (Mdrive) effects a change of the rotation angle (Δϕ) which is smaller than a threshold angle (ϕth);
upon detection of the blocking, control the HVAC actuator (1) to repeatedly change the applied drive torque (Mdrive) between a first torque value (M1) and a second torque value (M2) smaller than the first torque value (M1); and to
control the HVAC actuator (1) to periodically modulate the first torque value (M1) between a third torque value (M3) and a fourth torque value (M4) smaller than the third torque value (M3).