Abstract: A seal configuration for both reciprocating pistons and for rotating valves of internal combustion engines. A first embodiment, applicable to reciprocating pistons, provides minimum crevice volume (MCV). The MCV seal assembly according to the present invention, which replaces, at least, a conventional top piston ring and its annular groove, includes an annular groove in the piston, a wavy spring at the bottom of the annular groove and an MCV seal received in the annular groove and biased outwardly by the wavy spring, wherein the MCV seal assembly is configured and oriented so as to minimize the crevice volume above the MCV seal, wherein the spring biasing ensures an excellent sealing of the MCV seal to the cylinder wall.

Abstract: A seal configuration for both reciprocating pistons and for rotating valves of internal combustion engines. A first embodiment, applicable to reciprocating pistons, provides minimum crevice volume (MCV). The MCV seal assembly according to the present invention, which replaces, at least, a conventional top piston ring and its annular groove, includes an annular groove in the piston, a wavy spring at the bottom of the annular groove and an MCV seal received in the annular groove and biased outwardly by the wavy spring, wherein the MCV seal assembly is configured and oriented so as to minimize the crevice volume above the MCV seal, wherein the spring biasing ensures an excellent sealing of the MCV seal to the cylinder wall.

Abstract: A valve system for fluid processing machines which provides fully dynamic control over aspiration events. In the case of an internal combustion engine application, the variable orbital aperture valve system includes a rotary valve in the form of an "orbiter" disc having primary intake and exhaust apertures provided therein for sealing with the head of the combustion chamber and periodically aligning with intake and exhaust ports therein to thereby periodically aspirate the combustion chamber. The orbiter is connected by a linkage to the crank shaft of the internal combustion engine, and turns at typically one-half the crank shaft speed. The variable orbital aperture valve system further includes at least one "floater" disc having a secondary aperture therein which, depending upon the selected placement of the secondary aperture with respect to the respective intake or exhaust port, the aforesaid alignment with the primary intake or exhaust aperture of the orbiter is thereby modified.