Spool valve for fluid control

F - Mech Eng,Light,Heat,Weapons – 16 – K

Patent

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Details

F16K 3/24 (2006.01) F04B 1/12 (2006.01) F04B 1/14 (2006.01)

Patent

CA 2340354

A spool valve is provided with a stem portion that defines a fluid passageway formed by a pair of sidewalls with, preferably, interior surfaces that are shaped hydrodynamically and exterior surfaces that include a pressure-balancing channel. This stem passageway, which is designed to facilitate the flow of high--speed/high-pressure fluids controlled by the valve, is maintained in a predetermined orientation relative to the ports of the valve cylinders by a mechanism preferably including (a) a cam-following roller supported in a tang fixed to each spool and (b) a two-element cam that captures the roller within two of the parallel sides of a cam-track groove formed in the respective interior surfaces of each cam element.

Cette invention concerne un élément à tiroir (60f) qui définit un passage pour liquide (56f) formé soit (a) par un seul support central qui présente une surface non cylindrique incurvée de forme hydromécanique, soit (b) uniquement une paire de parois avec, de préférence, des parois intérieures également de forme hydrodynamique. Ces passages à tiroir, qui sont conçus pour faciliter l'écoulement de liquides à grande vitesse/sous pression élevée, sont maintenus selon une orientation déterminée par rapport aux orifices des cylindres de soupape au moyen d'un mécanisme comprenant de préférence (a) un poussoir de came à galet (66a) portant sur un ergot (62à) fixé à chacun des tiroirs et (b) une came à deux éléments qui retient le galet entre deux des flancs parallèles d'une gorge de déplacement de came réalisée dans les surfaces intérieures respectives de chaque élément de came.

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