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1. (WO2005060720) DISPOSITIF DE DECOMPRESSION A DEBIT AUGMENTE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIM OR CLAIMS

1. A pressure relief device for mounting on an electrical equipment housing over a vent opening for discharging pressurized fluid from the housing comprising:

a multiple stage valve having a valve body with a throat alignable with the vent
opening for discharging fluid from the housing;
a flange supporting the valve body for mounting the valve body on the housing
over the vent opening;
the flange having an annular working area between inner and outer diameters
circumscribing the intended location of fastening elements for attaching the flange to the housing;
a first-stage valve opening formed on the valve body for regulating the discharge of fluid from the throat of the valve body;
a second-stage valve opening formed on the valve body for regulating the discharge of fluid from the first-stage valve opening;
the second-stage valve opening having an effective diameter that is larger than an
effective diameter of the first-stage valve opening in a predetermined ratio; the second-stage valve opening being spaced along the throat of the valve body
from the flange;
the effective diameter the second-stage valve opening exceeding the inner diameter of the working area of the flange for enabling the effective diameter of the first-stage valve to be optimized for discharging fluid from the housing; and a spacing of the second-stage valve opening from the flange providing clearance
along the valve body to access the intended location of the fastening
elements for attaching the flange to the housing.

2. The device of claim 1 in which a pedestal is formed in the valve body adjacent to the flange and the pedestal has a height that extends the valve body along the throat.

3. The device of claim 2 in which a table is formed in the valve body on the pedestal and the table has an extended portion that overhangs the working area of the flange.

4. The device of claim 3 in which the table supports the second-stage valve opening on the extended portion of the table that overhangs the working area of the flange.

5. The device of claim 4 in which the height of the pedestal provides clearance between the overhanging portion of the table and the working area of the flange sufficient to avoid interfering with the receipt of the fastening elements for attaching the flange to the housing.

6. The device of claim 4 in which the table includes a collar that has an internal valve opening at an intersection of the throat and the collar as the first-stage valve opening and an external valve opening on a peripheral surface of the collar as the second-stage valve opening.

7. A pressure relief device for mounting on an electrical equipment housing over a vent opening for discharging pressurized fluid from the housing comprising:
a multiple stage valve having a valve body with a throat alignable with the vent
opening for discharging fluid from the housing;
a flange supporting the valve body for mounting the valve body on the housing
over the vent opening;
the flange having a working area adapted to receive fastening elements for
attaching the flange to the housing;
a pedestal formed in the valve body adjacent to the flange and having a height that extends the valve body along the throat;
a table formed in the valve body on the pedestal and having an extended portion
that overhangs the working area of the flange;
the table supporting the larger of two valve openings on the extended portion of the table that overhangs the working area of the flange so that the valve
openings can be sized independently of the working area of the flange for optimizing flow rates through the valve; and
the height of the pedestal providing clearance between the overhanging portion of the table and the working area of the flange sufficient to avoid interfering
with the receipt of the fastening elements for attaching the flange to the
housing.

8. The device of claim 7 in which the working area of the flange is an annular area between inner and outer diameters circumscribing the intended location of fastening elements for attaching the flange to the housing.

9. The device of claim 8 in which the larger of the two valve openings is spaced along the throat of the valve body from the flange and has an effective diameter that exceeds the inner diameter of the working area of the flange.

10. The device of claim 9 in which the spacing of the larger of the two valve openings from the flange exceeds the height of the pedestal to maintain clearance along the valve body to access the intended location of the fastening elements for attaching the flange to the housing.

11. The device of claim 10 in which the effective diameter of the larger of the two valve openings is larger that an effective diameter of the smaller of the two valve openings by a ratio of at least 2 to 1.

12. The device of claim 7 in which the table also supports the smaller of two valve openings.

13. The device of claim 12 in which the table includes a collar that supports first and second seals that circumscribe the two valve openings, the first seal circumscribing an internal valve opening through the collar formed at an intersection of the throat and the collar, and the second seal circumscribing an external valve opening on a peripheral surface of the collar. '

14. The device of claim 13 in which a both seals are engaged by a preloaded poppet.

15. The device of claim 9 in which the pedestal has an outer diameter that is smaller than the inner diameter of the working area of the flange.

16. The device of claim 7 in which the table includes posts for mounting a lid at a predetermined spacing from the table.

17. The device of claim 16 in which a compression spring is compressed between the lid and the table for biasing a poppet into a position for closing the two valve openings.

18. The device of claim 16 in which a peripheral shield is captured between the table and the lid.

19. The device of claim 18 in which the peripheral shield includes an opening for directing fluid discharges from the pressure relief device and is rotatable in the direction of its periphery with respect to the table and the lid.

20. A system for increasing flow rates through a pressure relief device attached to a conventional electrical equipment housing using standard size bolt circle surrounding vent openings in the housing comprising:
a multistage valve assembly having a mounting flange with bolt receiving features aligned with the standard bolt circle for mounting the PRD over the vent
opening of the conventional electrical equipment housing;
the bolt receiving features occupying a working area of the flange that receives the bolts together with any washers or other associated fastening elements for attaching the flange to the conventional electrical equipment housing;
a pedestal projecting from within the mounting flange adjacent to the working area of the mounting flange and having a throat aligned with the vent opening
for conveying discharge fluid through the valve assembly;
a table supported on the pedestal in communication with the throat having an
extended portion that overlies the working area of the flange;
first and second valve openings arranged in series for rapidly discharging fluid
through the throat of the mμltistage valve assembly in response to a
predetermined pressure in the conventional electrical equipment housing;
and
the table supporting at least the larger of the first and second valve openings on the extended portion that overlies the working area of the flange so that the
valve openings can be sized independently of the working area of the flange for optimizing flow rates through the pressure relief device.

21. The system of claim 20 in which the smaller of the first and second valve openings is sized substantially as large as the vent opening to avoid a further restriction on the flow through the pressure relief device.

22. The system of claim 21 in which the larger of the first and second valve openings is sized at least as large as the bolt circle without interfering with the receipt of the bolts and any associated fastening elements for attaching the flange to the housing.

23. The system of claim 20 in which the smaller of the first and second valve openings is an internal valve opening formed at an intersection of the table and the throat, and the larger of the first and second valve openings is an external valve opening formed around a lateral surface of the table.

24. The system of claim 23 in which posts located beyond the lateral surface of the table connect a lid to the table at a predetermined spacing.

25. The system of claim 24 in which a peripheral shield is captured between the table and the lid.

26. The system of claim 25 in which the peripheral shield includes an opening for directing fluid discharges from the' pressure relief device and is rotatable in the direction of its periphery with respect to the table and the lid.

27. The system of claim 25 in which a compression spring is compressed between the lid and the table for biasing a poppet into a position for closing the valve openings.