Valve arrangements

Details Valve arrangements Valve arrangements

B - Operations, Transporting

60

T

B60T 15/36 (2006.01) B60T 11/32 (2006.01)

Patent

CA 2055256

ABSTRACT OF THE DISCLOSURE A valve arrangement comprises an inlet port (?), an outlet port (?), a valve member (?) normally adopting a valve arrangement open position in which fluid flow from the inlet port (?) to the outlet port (?) is permitted via a choke (?), and a fluid chamber (?). The inlet port (?) is connected via another choke (?) to supply fluid to the fluid chamber (?) to urge the valve member (?) to a valve arrangement closed position. The two chokes (? ?) determine that upon flow of fluid from the inlet port (?) to the outlet port (?) the fluid pressure in the fluid chamber (?) tends to rise more slowly than the fluid pressure at the outlet port (?) and so the valve member (?) is urged to remain in the valve arrangement open position by the effect of the fluid pressure at the outlet port (?). If this fluid pressure is insufficient, either because of an existing rupture downstream of the valve arrangement or because such a rupture occurs, the fluid pressure in the fluid chamber (?) asserts itself to move the valve member (?) to the valve arrangement closed position.

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