Abstract: A valve assembly (10) comprising a valve member (14) having surfaces (70, 72, 74, 76, 78) radially sized and axially situated to provide an axial sealing force to insure leakfree operation. When the valve member (14) is in a supply position, the sum of fluid forces imposed on the radial surfaces is positive towards supply position, and, when the valve member (14) is a nonsupply position, the sum of fluid forces imposed on the radial surfaces is positive towards the nonsupply position. The valve assembly (10) is compatible with a piezo-type actuator (18) that provides lift-shift forces early in its stroke. Once movement of the valve member (14) has been initiated by the actuator (18), the fluid forces can be relied upon to complete the shift and seal the valve member (14) against the corresponding seat (40/42).

Abstract: A valve assembly (10) comprising a valve member (14) having surfaces (70, 72, 74, 76, 78) radially sized and axially situated to provide an axial sealing force to insure leakfree operation. When the valve member (14) is in a supply position, the sum of fluid forces imposed on the radial surfaces is positive towards supply position, and, when the valve member (14) is a nonsupply position, the sum of fluid forces imposed on the radial surfaces is positive towards the nonsupply position. The valve assembly (10) is compatible with a piezo-type actuator (18) that provides lift-shift forces early in its stroke. Once movement of the valve member (14) has been initiated by the actuator (18), the fluid forces can be relied upon to complete the shift and seal the valve member (14) against the corresponding seat (40/42).

Abstract: A combination of an apparatus or an extrusion for lengthwise movement of the elongate metal extrusion. The extrusion having therein a lengthwise cavity which has a central portion and two pockets disposed on opposite sides of and opening into the central portion. The apparatus has a tool disposed in the cavity and supported for eccentric rotation about an axis extending perpendicular to the direction of movement of the extrusion, the tool having abrading points which are spaced angularly about its centerline and which engage and physically roughen a surface in one of the pockets. The degree of eccentricity is adjustable. In a variation, the apparatus effects movement of a first member having two pegs which engage angled slots in a second member supporting a tool in the extrusion cavity, the tool being moved rectilinearly into and out of engagement with the extrusion surface in a manner physically roughening the surface.