Control valve assembly for pumps and injectors

F - Mech Eng,Light,Heat,Weapons – 02 – M

Patent

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Details

F02M 37/04 (2006.01) F02M 57/02 (2006.01) F02M 59/36 (2006.01) F02M 59/46 (2006.01)

Patent

CA 2366014

Pumps (6) and injectors (4) utilize a control valve (46) having a valve body (48) with a valve stem (88) having a step (94) adjacent to the seating surface (92). The step extends a limited distance away from the seating surface to provide limited pressure relief when the valve body is at an intermediate position that is between the opened and closed positions. Step cross-section and axial length may be configured based on desired hydraulic behavior. In a preferred embodiment, the control valve step is configured for injection rate shaping.

L'invention concerne des pompes (6) et des injecteurs (4) comportant une soupape de réglage (46) dont le corps est constitué d'une tige (48) de soupape présentant un décrochement (94) adjacent à la surface d'appui (92). Ce décrochement fait saillie sur une distance limitée à partir de la surface d'appui de manière à assurer une décompression limitée lorsque le corps de soupape se trouve en position intermédiaire, c'est à dire entre la position d'ouverture et la position de fermeture. La section transversale du décrochement et sa longueur axiale peuvent être choisies en fonction du comportement hydraulique souhaité. Dans une réalisation préférée, le décrochement de la soupape de réglage est conçu pour permettre une sélection de la vitesse d'injection.

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