Abstract: A valve assembly is provided for controlling the recirculation of exhaust gases in an internal combustion engine. The assembly includes a fixed body portion having an exhaust inlet and an exhaust outlet port and a moveable transducer portion. A diaphragm is attached to the body and transducer portions to define a vacuum chamber and an atmospheric chamber in the body portion and a second atmospheric or air bleed chamber and an exhaust chamber in the transducer portion. Passages integrally formed in the diaphragm at its point of attachment to the transducer portion provide fluid communication between the two atmospheric chambers. Valve means are provided between the transducer atmospheric chamber and the vacuum chamber and between the exhaust inlet and outlet ports.

Abstract: An electrically operated valve having a mechanically actuated position for valving a fluid port between an open and closed position. A first tubular pole member contained within an electrical coil is movable between a first and second position with respect to a second, stationary, coaxially aligned tubular pole member. A reset spring urges the first pole member toward the first position. An armature, having a valve sealing surface at one end, is movable between first and second positions for alternately closing and opening a fluid port. The first pole member defines an air gap with respect to the second pole member which, during energization of the electrical coil, has associated therewith a magnetic flux with accompanying lines of magnetic force. One end of the armature is spaced closely adjacent to the air gap so that, upon energization of the coil, the magnetic force lifts the armature to the second position, overcoming a second biasing spring which normally maintains the armature in the first position.

Abstract: The invention relates to a four-port thermally responsive valve for valving two normally closed fluid ports and one pair of normally open fluid ports in response to predetermined temperatures. A single valve member is movably contained within a housing passageway and spring biased in a first position so that a sealing surface at each end of the valve member is respectively engageable with and spaced from corresponding seating surfaces in the passageway for achieving initially open or closed valved conditions between the individual ports in each pair. A centrally located seal ring mounted in the housing passageway and surrounding the valve member isolates one pair of fluid ports from a second pair of fluid ports when the valve member is moved to a second position thereby permitting three valving functions to be attained with one device.