Rotary-actuated exhaust gas recirculation valve having a seating force attenuator

A poppet valve assembly comprising:

• a) a valve body defining a chamber having an outlet defined by a port surrounded by a valve seat, said body further defining a first bore in a wall of said chamber;
• b) a poppet valve having a stem and a head, said stem being slidably disposed in said first bore and said head being selectively matable with said seat to define a valve for regulating flow of material across said seat;
• and
• c) a shock-absorber disposed between said stem and said head to attenuate closing force of said valve, wherein said shock-absorber is mounted in surrounding relationship on said stem.

A poppet valve assembly comprising:

• a) a valve body defining a chamber having an outlet defined by a port surrounded by a valve seat, said body further defining a first bore in a wall of said chamber;
• b) a poppet valve having a stem and a head, said stem being slidably disposed in said first bore and said head being selectively matable with said seat to define a valve for regulating flow of material across said seat;
• and
• c) a shock-absorber disposed between said stem and said head to attenuate closing force of said valve, wherein said shock-absorber is a wave washer mounted in surrounding relationship on said valve stem on a side of said valve head adjacent said first bore.

A poppet valve assembly comprising:

• a) a valve body defining a chamber having an outlet defined by a port surrounded by a valve seat, said body further defining a first bore in a wall of said chamber;
• b) a poppet valve having a stem and a head, said stem being slidably disposed in said first bore and said head being selectively matable with said seat to define a valve for regulating flow of material across said seat;
• c) an axial second bore through said valve bead for sliding passage of said valve stem;
• d) a shock-absorber disposed between said stem and said head to attenuate closing force of said valve, wherein said shock absorber is a wave washer mounted in surrounding relationship on said valve stem on a side of said valve head opposite said first bore;
• and
• e) a retainer for retaining said wave washer on said valve stem.

An exhaust gas recirculation valve assembly for metering exhaust gas from an exhaust system into an intake system of an internal combustion engine, comprising:

• a) a valve body defining a first chamber in communication with one of said exhaust system and said intake system and a second chamber in communication with the other of said exhaust system and said intake system, wherein said first and second chambers are joined by a common port surrounded by a valve seat, said body further defining a first bore in a wall of one of said first and second chambers;
• b) a poppet valve having a stem and a head, said stem being slidably disposed in said first bore and said head being selectively matable with said seat to define a valve for regulating flow of material between said first and second chambers across said seat;
• and
• c) a shock-absorber disposed between said stem and said head to attenuate closing force of said valve, wherein said shock-absorber is mounted in surrounding relationship on said stem.