Piston-controlled anti-siphon valve

{
  "publication_number": "US9441746B2",
  "country": "US",
  "kind": "B2",
  "title": "Piston-controlled anti-siphon valve",
  "abstract": "The present application relates to an anti-siphon valve for a tank including a body with an inlet, an outlet, and a passage for the fluid, the passage connecting the inlet to the outlet. The anti-siphon valve further includes a movable cut-off device interacting with a seat to close the passage. The cut-off device normally remains in the closed position and is designed to open the passage in the presence of a positive pressure difference between the inlet and the outlet. The anti-siphon valve further includes an auxiliary control mechanism for the cut-off device towards the passage opening, the control mechanism being designed to act on the cut-off device only to open the passage, so as to enable the cut-off device to move under the effect of pressure at the outlet independently of the mechanism.",
  "claims": [
    "1. An anti-siphon valve for a tank of fluid, comprising: a body having an inlet, an outlet, and a passage for the fluid, the passage connecting the inlet to the outlet; a moveable cut-off device mating with a seat to close the passage, the cut-off device being normally in a closed position and designed to open the passage in the presence of a pressure difference between the inlet and the outlet that is greater than a positive threshold value; and an auxiliary control mechanism physically engaging with the cut-off device, the auxiliary control mechanism being disposed toward the open position of the passage; wherein the auxiliary control mechanism of the cut-off device is configured to act on the cut-off device only in the opening direction of the passage, so as to enable the cut-off device to open under the effect of the pressure difference independently of the auxiliary control mechanism.",
    "2. The anti-siphon valve according to claim 1, wherein the auxiliary control mechanism is actuated by a fluid.",
    "3. The anti-siphon valve according to claim 1, wherein the fluid is a liquid.",
    "4. The anti-siphon valve according to claim 1, wherein the auxiliary control mechanism comprises: a control piston mechanically connected to the cut-off device by an end-stop system when the piston moves in the direction corresponding to the opening of the passage.",
    "5. The anti-siphon valve according to claim 4, wherein the end-stop system comprises: a rod sliding through the piston and having an end-stop with which the piston comes into contact as the piston moves in the direction corresponding to the opening of the passage, the rod being integral with the cut-off device.",
    "6. The anti-siphon valve according to claim 4, further comprising: a chamber; wherein the control piston forms a sliding fit with the chamber.",
    "7. The anti-siphon valve according to claim 1, wherein the passage includes an inner surface which matches the periphery of the cut-off device during movement between the closed and open positions, the periphery of the cut-off device sweeping across the outlet during movement between the closed and the open positions.",
    "8. The anti-siphon valve according to claim 1, wherein the anti-siphon valve comprises: a spring configured to maintain the cut-off device in the closed position, the spring being located between the cut-off device and the auxiliary control mechanism.",
    "9. The anti-siphon valve according to claim 8, wherein the spring is preloaded, so that the limit value of the pressure difference that enables the passage to open is greater than 0.05 bar.",
    "10. The anti-siphon valve according to claim 8, wherein the spring is preloaded, so that the limit value of the pressure difference that enables the passage to open is greater than 0.10 bar.",
    "11. The anti-siphon valve according to claim 8, wherein the spring is preloaded, so that the limit value of the pressure difference that enables the passage to open is greater than 0.50 bar.",
    "12. The anti-siphon valve according to claim 1, wherein the anti-siphon valve comprises: an annular groove open axially towards the auxiliary control mechanism, the auxiliary control mechanism being arranged to close the annular groove.",
    "13. A tank for fluid, comprising: at least one opening; and an anti-siphon valve for closing at least one of the openings; wherein the anti-siphon valve comprises: a body having an inlet, an outlet, and a passage for the fluid, the passage connecting the inlet to the outlet; a moveable cut-off device mating with a seat to close the passage, the cut-off device being normally in a closed position and designed to open the passage in the presence of a pressure difference between the inlet and the outlet that is greater than a positive threshold value; an auxiliary control mechanism operably associated with the cut-off device, the auxiliary control mechanism being disposed toward an open position of the passage; and an end-stop mechanism mechanically connected to the auxiliary control mechanism and to the cut-off device in such a way that the auxiliary control mechanism of the cut-off device is configured to act on the cut-off device, through the end-stop mechanism, only in the opening direction of the passage, so as to enable the cut-off device to open under the effect of the pressure difference independently of the auxiliary control mechanism.",
    "14. The tank according to claim 13, wherein the anti-siphon valve comprises: a chamber opening into the tank; and wherein the auxiliary control mechanism comprises a control piston that forms a sliding fit with the chamber.",
    "15. The tank according to claim 13, wherein the anti-siphon valve comprises: an actuator pipe communicating with the outside of the tank and the auxiliary control mechanism.",
    "16. The tank according to claim 13, further comprising: a heat exchanger configured to exchange heat between air and a liquid.",
    "17. The tank according to claim 13, further comprising: a casing; wherein the anti-siphon valve is located inside the casing and the body of the anti-siphon valve is in contact with the casing, or the anti-siphon valve is remote from the casing and the body of the anti-siphon valve is located outside the casing.",
    "18. A turbomachine, comprising: a tank; and an anti-siphon valve comprising: a body having an inlet, an outlet, and a passage for the fluid, the passage connecting the inlet to the outlet; a moveable cut-off device mating with a seat to close the passage, the cut-off device being normally in a closed position and designed to open the passage in the presence of a pressure difference between the inlet and the outlet that is greater than a positive threshold value; and an auxiliary control mechanism operably associated with the cut-off device, the auxiliary control mechanism being disposed toward the open position of the passage; wherein the auxiliary control mechanism of the cut-off device is configured to act on the cut-off device only in the opening direction of the passage, so as to enable the cut-off device to open under the effect of the pressure difference independently of the auxiliary control mechanism, wherein the auxiliary control mechanism comprises a control piston mechanically connected to the cut-off device by an end-stop system when the piston moves in the direction corresponding to the opening of the passage, and wherein the end-stop system comprises a rod sliding through the piston and having an end-stop with which the piston comes into contact as the piston moves in the direction corresponding to the opening of the passage.",
    "19. The turbomachine according to claim 18, wherein the anti-siphon valve comprises: an actuator pipe communicating with the outside of the tank and the auxiliary control mechanism.",
    "20. The turbomachine according to claim 18, wherein the anti-siphon valve comprises: a heat exchanger configured to exchange heat between air and a liquid."
  ],
  "cpc": [
    "F16K 15/18",
    "F01D 25/18",
    "F01M 1/16",
    "F01M 11/06",
    "F01M 2011/007",
    "F16N 19/006",
    "Y10T 137/3149"
  ],
  "assignees": [
    "TECHSPACE AERO SA"
  ],
  "filing_date": "2014-06-25",
  "publication_date": "2016-09-13",
  "grant_date": "2016-09-13",
  "priority_date": "2013-06-25",
  "application_number": "US-201414314497-A",
  "family_id": "48703181",
  "citations": [
    "DE10206268A1",
    "DE19838927A1",
    "DE3638958A1",
    "FR2654466A1",
    "US2013081720A1",
    "US2014331639A1",
    "US3723025A",
    "US3965922A",
    "US4389984A",
    "US4412789A",
    "US4717000A",
    "US4796652A",
    "US5018601A",
    "US5125429A",
    "US5590675A",
    "US6161515A"
  ]
}