A valve for a fuel tank is provided, comprising a housing configured with a float chamber and a disk chamber being in flow communication through an intermediate flow path. The disk chamber is configured with a fluid outlet port from the intermediate flow path and a valve outlet and a fluid inlet por
A valve for a fuel tank is provided, comprising a housing configured with a float chamber and a disk chamber being in flow communication through an intermediate flow path. The disk chamber is configured with a fluid outlet port from the intermediate flow path and a valve outlet and a fluid inlet port is sealable by a sealing member of a float member axially displaceable within the float chamber to selectively facilitate fluid flow to or from the float chamber via the valve. The fluid outlet port is sealable by a pressure holding member axially having an under pressure bleed valve displaceable between a sealed position wherein the under pressure bleed valve is sealed, and an open position wherein the under pressure bleed valve is open, providing passage of fluid therethrough.
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1. A valve for a fuel tank comprising a housing configured with a float chamber and a disk chamber being in flow communication through an intermediate flow path; said float chamber configured with: a valve inlet which is in fluid communication with the fuel tank; and a fluid inlet port into said int
1. A valve for a fuel tank comprising a housing configured with a float chamber and a disk chamber being in flow communication through an intermediate flow path; said float chamber configured with: a valve inlet which is in fluid communication with the fuel tank; and a fluid inlet port into said intermediate flow path; said disk chamber configured with a fluid outlet port from said intermediate flow path and a valve outlet; the fluid inlet port is sealable by a sealing member of a float member axially displaceable within the float chamber to selectively facilitate the fluid flow to or from the float chamber via the valve, and the fluid outlet port is sealable by a pressure holding member axially displaceable within the disk chamber to selectively facilitate fluid flow into or out of said fluid outlet port; said pressure holding member is configured with an under pressure bleed valve displaceable between a sealed position wherein the under pressure bleed valve is sealed, and an open position wherein the under pressure bleed valve is open, providing passage of fluid; wherein the under pressure bleed valve is in a form of an aperture formed in the pressure holding member and a movable member displaceable within the aperture responsive to pressure differential and fluid flow rate between the open position, corresponding to the open position of the under pressure bleed valve, in which said aperture is open to facilitate the fluid flow through said aperture, and the sealed position, corresponding to the sealed position of the under pressure bleed valve, in which the aperture is sealed; wherein said movable member comprises a head portion and a main portion, the head portion being configured for sealing the aperture in said sealed position; and wherein in a regular state of the valve, the under pressure bleed valve is biased by gravity to the open position, in which said head portion projects away from the pressure holding member while concurrently the main portion is at least partially accommodated in the aperture. 2. The valve according to claim 1, wherein said movable member is a separate member which is mechanically disconnected from said pressure holding member. 3. The valve according to claim 1, wherein said movable member is freely accommodated within said aperture. 4. The valve according to claim 1, wherein said movable member is an inverted restricting pin having a cross-sectional T-shape. 5. The valve according to claim 1, wherein said head portion has a diameter which is larger than a diameter of the aperture. 6. The valve according to claim 1, wherein in said sealed position of the under pressure bleed valve, said head portion bears against a bottom surface of the pressure holding member. 7. The valve according to claim 1, wherein said main portion is characterized by an elongated shape and having a diameter which is smaller than a diameter of said aperture so as to allow passage of the fluid. 8. The valve according to claim 1, wherein in said open position of the under pressure bleed valve, said head portion is displaced downwardly, towards the intermediate flow path, to facilitates restricted fluid flow through said aperture of the pressure holding member. 9. The valve according to claim 1, wherein said under pressure bleed valve is disposed within said pressure holding member. 10. The valve according to claim 1, wherein the pressure holding member is a disk member displaceable within the disk chamber between a disk member open position providing passage about sealing boundaries of the disk member and a closed position in which the disk member rests over the sealing boundaries of the fluid outlet port, so as to selectively facilitate the fluid flow out of the fluid outlet port into the disk chamber. 11. The valve according to claim 10, wherein the valve has an under pressure position in which said disk member is disposed at the closed position of the disk member, preventing passage of the fluid about the sealing boundaries, and in which the under pressure bleed valve disk member is in the open position in which the under pressure bleed valve facilitates the fluid flow from the disk chamber through the under pressure bleed valve into the float chamber. 12. The valve according to claim 10, wherein the valve has an outlet bleed position in which said disk member is disposed at the closed position, providing fluid bleed about the sealing boundaries and in which the under pressure bleed valve is in the open position in which the under pressure bleed valve facilitates the fluid flow from the float chamber into the disk chamber through the under pressure bleed valve. 13. The valve according to claim 10, wherein the valve has a transition open position in which said disk member is disposed at its the closed position, providing fluid bleed about the sealing boundaries, and in which the under pressure bleed valve is in the sealed position. 14. The valve according to claim 10, wherein the valve has a fully opened position in which said disk member is disposed at the open position, providing fluid bleed about the sealing boundaries, and in which the under pressure bleed valve is in the sealed position. 15. The valve according to claim 1, wherein the float member is axially displaceable within the housing along a longitudinal axis, the sealing member of the float member is configured as an elongated flexible closure membrane strip anchored at one end to an end of the float member adjacent the fluid inlet port and at a portion offset with respect to the fluid inlet port. 16. The valve according to claim 15, wherein the float member is connected to a spring which is configured to displace the float member away from the fluid inlet port and detach the strip from sealing engagement with the fluid inlet port. 17. The valve according to claim 16, wherein said valve has a roll over position in which said float member is displaced toward the fluid inlet port and seals the fluid inlet port. 18. The valve according to claim 17, wherein the valve has at least one of an under pressure position, an outlet bleed position, a transition open position, and a fully opened position, and wherein in the respective said under pressure position, said outlet bleed position, said transition open position, and said fully opened position, said valve is not in said roll-over position. 19. The valve according to claim 1, wherein under conditions of under pressure in said float chamber, said the movable member is maintained at said open position under force of gravity and owing to the pressure differential.
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