Two stage pressure control valve

In a two stage pressure control valve of the type having a fluid inlet, a fluid outlet, a valve seat between said inlet and outlet, a poppet movable toward and away from said seat to vary the cross-sectional area of a passageway from said inlet to said outlet, the position of said poppet being dependent in part upon the difference in pressure between a fluid pressure at said inlet which exerts a force on said poppet in one axial direction and a control pressure produced by a fluid flow from said inlet in a chamber which varies in volume as said poppet moves axially, said control pressure exerting a force on said poppet in an axial direction opposite from said one axial direction, said control pressure being controlled by an electromagnetic coil which can be variably energized to move an armature so as to vary a variable restriction downstream from said control pressure so as to vary said control pressure, an improvement wherein said chamber is in communication with said variable restriction through at least one orifice upstream of said variable restriction and said orifice opens into an unrestricted passageway which is fed by an upstream orifice in communication with the inlet and depleted by a downstream orifice in communication with the variable restriction.

In a two stage pressure control valve of the type having a fluid inlet, a fluid outlet, a valve seat between said inlet and outlet, a poppet movable toward and away from said seat to vary the cross-sectional area of a passageway from said inlet to said outlet, the position of said poppet being dependent in part upon the difference in pressure between a fluid pressure at said inlet which exerts a force on said poppet in one axial direction and a control pressure produced by a fluid flow from said inlet in a chamber which varies in volume as said poppet moves axially, said control pressure exerting a force on said poppet in an axial direction opposite from said one axial direction, said control pressure being controlled by an electromagnetic coil which can be variably energized to move an armature so as to vary a variable restriction downstream from said control pressure so as to vary said control pressure, an improvement wherein said chamber is in communication with said variable restriction through at least one orifice upstream of said variable restriction and said chamber is closed except for one orifice.

In a two stage pressure control valve of the type having a fluid inlet, a fluid outlet, a valve seat between said inlet and outlet, a poppet movable toward and away from said seat to vary the cross-sectional area of a passageway from said inlet to said outlet, the position of said poppet being dependent in part upon the difference in pressure between a fluid pressure at said inlet which exerts a force on said poppet in one axial direction and a control pressure produced by a fluid flow from said inlet in a chamber which varies in volume as said poppet moves axially, said control pressure exerting a force on said poppet in an axial direction opposite from said one axial direction, said control pressure being controlled by an electromagnetic coil which can be variably energized to move an armature so as to vary a variable restriction downstream from said control pressure so as to vary said control pressure, an improvement wherein said chamber is in communication with said variable restriction through at least one orifice upstream of said variable restriction and fluid flowing from said inlet to said variable restriction is bypassed into said chamber by said orifice.

In a two stage pressure control valve of the type having a fluid inlet, a fluid outlet, a valve seat between said inlet and outlet, a poppet movable toward and away from said seat to vary the cross-sectional area of a passageway from said inlet to said outlet, the position of said poppet being dependent in part upon the difference in pressure between a fluid pressure at said inlet which exerts a force on said poppet in one axial direction and a control pressure produced by a fluid flow from said inlet in a chamber which varies in volume as said poppet moves axially, said control pressure exerting a force on said poppet in an axial direction opposite from said one axial direction, said control pressure being controlled by an electromagnetic coil which can be variably energized to move an armature so as to vary a variable restriction downstream from said control pressure so as to vary said control pressure, an improvement wherein said chamber is in communication with said variable restriction through at least one orifice upstream of said variable restriction and fluid from said inlet is admitted into said chamber through a first orifice and a second orifice downstream of said first orifice.

In a two stage pressure control valve of the type having a fluid inlet, a fluid outlet, a valve seat between said inlet and outlet, a poppet movable toward and away from said seat to vary the cross-sectional area of a passageway from said inlet to said outlet, the position of said poppet being dependent in part upon the difference in pressure between a fluid pressure at said inlet which exerts a force on said poppet in one axial direction and a control pressure produced by a fluid flow from said inlet in a chamber which varies in volume as said poppet moves axially, said control pressure exerting a force on said poppet in an axial direction opposite from said one axial direction, said control pressure being controlled by an electromagnetic coil which can be variably energized to move an armature so as to vary a variable restriction downstream from said control pressure so as to vary said control pressure, an improvement wherein said chamber is in communication with said variable restriction through at least one orifice upstream of said variable restriction and fluid is channeled from said inlet to said variable restriction through a tube which extends through said poppet, said chamber being defined adjacent to an outer surface of said tube.

In a two stage pressure control valve of the type having a fluid inlet, a fluid outlet, a valve seat between said inlet and outlet, a poppet movable toward and away from said seat to vary the cross-sectional area of a passageway from said inlet to said outlet, the position of said poppet being dependent in part upon the difference in pressure between a fluid pressure at said inlet which exerts an force on said poppet in one axial direction and a control pressure produced by a fluid flow from said inlet in a chamber which varies in volume as said poppet moves axially, said control pressure exerting a force on said poppet in an axial direction opposite from said one axial direction, said control pressure being controlled by an electromagnetic coil which can be variably energized to move an armature so as to vary a variable restriction downstream from said control pressure so as to vary said control pressure, an improvement wherein a tube extends through said poppet for communicating a flow of fluid from said inlet to said variable restriction and said chamber is positioned adjacent to an exterior surface of said tube.