Patent ID: 6102362
Filing Date: 2000-08-15
Classification: F15B,Y10T

Abstract:
A gas motor actuator for opening or closing a valve in a pipe, the valve in the pipe having a limit at or between a fully-closed and a fully-opened position, comprising:a gas-driven motor having an output that can be operatively coupled to the valve in the pipe, the motor having an open port and a close port for receiving power gas for rotating the motor to open or close the valve in the pipe, respectively;a shuttle valve for delivering the power gas to the motor and for receiving and discharging the power gas from the motor;a control-limit valve assembly, the control-limit valve assembly having a control valve portion, a limit valve portion and a passageway capable of delivering power gas to the shuttle valve; anda valve disposed in the passageway,the control valve portion being adapted to receive a signal and to open the valve in the passageway upon receipt of the signal,the limit valve portion being adapted to close the valve in the passageway as the valve in the pipe approaches its limit.