Control valve assembly for a compressor unloader

F - Mech Eng,Light,Heat,Weapons – 04 – B

Patent

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Details

F04B 23/02 (2006.01) F04B 41/02 (2006.01) F04B 49/03 (2006.01)

Patent

CA 2647511

A closing element is for a valve assembly of a compressor unloader, the compressor including a casing with a compression chamber, the unloader including a housing defining a chamber. The valve assembly has a base between the compression and unloader chambers, a passage connecting the two chambers, a seat about the passage, and a stem bore within the base having a control chamber. The closing element includes a main body movably disposed within the stem bore and having a sealing surface disposeable against the valve seating surface to obstruct the valve passage and a control end surface within the bore control chamber. A sealing member disposed about the main body prevents flow between the control chamber and the valve passage. The main body and/or the sealing member is configured such that the main body is radially moveable to align the body sealing surface with the valve seat.

L'invention concerne un élément de fermeture destiné à un ensemble soupape de dispositif de décompression de compresseur, le compresseur comprenant une enveloppe comportant une chambre de compression, le dispositif de décompression comprenant un corps définissant une chambre. L'ensemble soupape comporte une base se situant entre les chambres de compression et de décompression, un passage reliant les deux chambres, un siège autour du passage et un alésage de tige dans la base pourvu d'une chambre de commande. L'élément de fermeture comprend un corps principal placé de manière à pouvoir se déplacer dans l'alésage de tige et comportant une surface d'étanchéité pouvant être placée contre la surface du siège de soupape pour obstruer le passage de soupape, et une surface d'extrémité de commande se situant dans la chambre de commande de l'alésage. Un élément d'étanchéité placé autour du corps principal empêche tout écoulement entre la chambre de commande et le passage de soupape. Le corps principal et/ou l'élément d'étanchéité est/sont conçus de sorte que le corps principal peut être déplacé radialement afin d'aligner la surface d'étanchéité du corps sur le siège de soupape.

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