Pilot operated pneumatic valve

Details Pilot operated pneumatic valve Pilot operated pneumatic valve

F - Mech Eng,Light,Heat,Weapons

15

B

F15B 13/043 (2006.01) F16K 31/42 (2006.01)

Patent

CA 2469563

A pilot operated valve assembly (10) including a valve body (12) having a pressurized air supply inlet port (28) in communication with a source of pressurized air and at least one cylinder passage (30, 32). A main valve bore (34) extends axially within the valve body (12) and a main valve member (44) is movable between predetermined positions within the main valve bore (34) to selectively direct pressurized air from the inlet port (28) through at least one cylinder passage (30, 32). A pilot valve bore (122) is formed within the main valve member (44) and extends coaxially relative to the main valve bore (34). A pair of short pilot cylinder ports (136, 138) spaced apart from one another extend between the main valve bore (34) and the pilot valve bore (122). A pilot valve member (140) is movable between predetermined positions within the pilot valve bore (122) to selectively direct air from the pilot valve bore (122) through alternating ones of the pilot cylinder ports (136, 138) to act upon the main valve member (44) thereby moving the main valve member (44) between predetermined positions.

L'invention concerne un ensemble soupape commandée par pilote (10), qui comprend un corps de soupape (12) muni d'un orifice d'admission d'air sous pression (28) communiquant avec une source d'air sous pression et au moins un passage cylindrique (30, 32). Un alésage de soupape principal (34) s'étend axialement à l'intérieur du corps de soupape (12) et un élément de soupape principal (44) peut être déplacé entre des positions préétablies à l'intérieur de l'alésage de soupape principal (34) pour acheminer sélectivement l'air sous pression depuis l'orifice d'admission d'air sous pression (28) à travers au moins un passage cylindrique (30, 32). Un alésage de soupape pilote (122) est ménagé dans l'élément de soupape principal (44) et s'étend coaxialement à l'alésage de soupape principal (34). Deux orifices de cylindre pilote courts (136, 138) espacés l'un de l'autre s'étendent entre l'alésage de soupape principal (34) et l'alésage de soupape pilote (122). Un élément de soupape pilote (140) peut être déplacé entre des positions préétablies à l'intérieur de l'alésage de soupape pilote (122) pour acheminer sélectivement l'air depuis l'alésage de soupape pilote (122) à travers les orifices de cylindre pilote courts (136, 138), alternativement, afin d'agir sur l'élément de soupape principal (44) pour le déplacer entre des positions préétablies.

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