FLOW CONTROL VALVE

摘要

A flow control valve has a linear electric actuator for controlling flow through the valve. The linear electric actuator comprises an electric motor (1) and a shaft (2) configured for linear movement under the control of the motor (1) to open and close the valve. A safety device interposed between the shaft (2) and a valve member (9) is biased to move the valve member (9) to close the valve if the linear electric actuator is disabled when the valve is open such as by an interruption of the power supply to the linear electric actuator.