| 摘要 |
A flow system comprises a system flow path extending from a system inlet (106) to a system outlet (108). A pressure module (110) is provided within the system flow path to establish a differential pressure between upstream and downstream sides thereof during flow from the system inlet (106) to the system outlet (108) The system also comprises a valve (116) provided within the system flow path, and a valve actuator (118) in pressure communication with the system flow path on upstream and downstream sides of the pressure module (110). The valve actuator (118) is driven by a differential pressure established by the pressure module (110) to move between a first position in which the valve (116) is closed, and a second position in which the valve (116) is opened (Fig.). |
