US 4,228,820 AGranted

Seat guided poppet valve having flow and dampening control means

AssigneeThe Yorde Machine Products Company

InventorRichard M. Deminski

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Abstract

A seat guided poppet valve for fluid compressors and the like having improved flow directing characteristics provided by a poppet element having integral flutes surrounded by a shroud and variable dampening provided by adjustable seals or dashpots. The dashpot may reciprocate with the poppet element or be constrained within the guard. A seat seal is established by conventional abutment of the poppet element head surface with the seat outlet port seating surface, or by eliminating that portion of the poppet element head overhanging the seat outlet port so that the circumferential surface of the head makes a sliding seal with the inner surface of the seat bore. Additional sealing may be provided by a resilient ring entrained within a groove inscribed in the circumferential surface of the poppet element head, or by constructing the circumferential surface of a resilient material which deforms as the head enters the seat bore. Lift washers are provided to control the amount of valve lift.

Claims23

Dependent claims

A seated guided poppet valve comprising a seat, a guard mated with said seat and a poppet element movable longitudinally within said guard and seat, said seat having a bore extending therethrough with an inlet port and an outlet port, said inlet port adapted to communicate with a source or sink of fluid, said guard having a first bore therein coaxially communicating with said seat bore and a second bore coaxial with and of lesser diameter than said first bore, said first bore being connected to at least one fluid channel, said poppet element comprising a substantially mushroom-shaped body having a cylindrical stem terminating at one end in a cap-like head, said head having seat-enaging means for forming a substantially fluid-tight seal against said seat, said head terminating in a plurality of elongated vane-like flutes slidingly received within said seat bore and extending radially outward from the longitudinal axis of said poppet element, each of said flutes having a seat abutting surface along the longitudinal edge of the flute for guiding said poppet element solely within said seat bore, said poppet element being guided exclusively by said seat bore as said element reciprocates longitudinally, the junction of said flutes and said head forming concave surfaces extending in a smooth surface between said flutes and said seat engaging means for directing the flow of fluid thereacross to reduce turbulence, said stem being received for longitudinal reciprocating movement within said second guard bore and containing a coaxial bore, said valve further including a compression spring contained within said stem bore and cooperating with said second guard bore for urging said poppet head toward said seat, whereby said seat engaging surface of said poppet head abuts said seat when said valve is closed to prevent fluid flow through said valve and is spaced from said seat when said valve is open to permit fluid flow through said valve.

A seat guided poppet valve comprising a seat, a guard mated with said seat and a poppet element movable longitudinally within said guard and seat, said seat having a bore extending therethrough with an inlet port and an outlet port, said inlet port adapted to communicate with a source or sink of fluid, said guard having a first bore therein coaxially communicating with said seat bore and a second bore coaxial with and of lesser diameter than said first bore, said first bore being connected to at least one fluid channel, said poppet element comprising a substantially mushroom-shaped body having a cylindrical stem terminating at one end in a cap-like head, said head having seat-engaging means for forming a substantially fluid-tight seal against said seat, and including guide means connected to said seat engaging means slidingly engaging said seat bore so that said poppet element is guided exclusively by said seat bore, as said element reciprocates longitudinally, said stem being received for longitudinal reciprocating movement within said second guard bore and containing a coaxial bore, said valve including dampening control means comprising a thimble slidably received within said stem bore, resilient means associated with said thimble for urging said thimble away from said poppet element, said thimble further including means for preventing relative longitudinal movement between said thimble and said guard, whereby said seat engaging surface of said poppet head abuts said seat when said valve is closed to prevent fluid flow through said valve and is spaced from said seat when said valve is open to permit fluid flow through said valve.

Dependencies are inferred from the claim text.