Abstract: A fluid control system includes a valve, an actuator, a primary valve timing system, and a secondary valve timing system. The valve is operable in an open position and a closed position. The actuator is operable to move the valve from the closed position to the open position. The primary valve timing system is in communication with the actuator and is operable to move the valve from the open position to the closed position after a first period of time. The secondary valve timing system is in communication with the actuator and is operable to move the valve from the open position to the closed position after a second period of time.

Abstract: A pneumatic controller for connecting to a vacuum source and providing a vacuum output signal. The pneumatic controller includes a valve body defining a number of different chambers. At least two of the chambers that are separated by diaphragm and one of these chambers is maintained at vacuum pressure. In response to a pressure differential between the two chambers, the diaphragm deforms causing a valve to move from a first position, where an output port is coupled to atmospheric pressure, to a second position, where the output port is coupled to vacuum pressure. The valve is inhibited for moving between the first and second positions unless a sufficient vacuum pressure is present. Movement of the valve from the second position to the first position is also delayed until the two chambers are substantially equalized.

Abstract: A pneumatic controller for connecting to a vacuum source and providing a vacuum output signal. The pneumatic controller includes a valve body defining a number of different chambers. At least two of the chambers that are separated by diaphragm and one of these chambers is maintained at vacuum pressure. In response to a pressure differential between the two chambers, the diaphragm deforms causing a valve to move from a first position, where an output port is coupled to atmospheric pressure, to a second position, where the output port is coupled to vacuum pressure. The valve is inhibited for moving between the first and second positions unless a sufficient vacuum pressure is present. Movement of the valve from the second position to the first position is also delayed until the two chambers are substantially equalized.

Abstract: A fluid control system includes a valve, an actuator, a primary valve timing system, and a secondary valve timing system. The valve is operable in an open position and a closed position. The actuator is operable to move the valve from the closed position to the open position. The primary valve timing system is in communication with the actuator and is operable to move the valve from the open position to the closed position after a first period of time. The secondary valve timing system is in communication with the actuator and is operable to move the valve from the open position to the closed position after a second period of time.