Control valve and system

Claim 2

A control valve comprising a housing, a pair of modulating means movable in said housing in parallel flow relation for performing modulating operations on fluid pressure supplied thereto and interrupting said parallel flow relation under preselected conditions, respectively, each of said modulating means being generally operable to interrupt said parallel flow relation upon the modulating operation of the other thereof to effect applications through said housing of reduced fluid pressures in different predetermined ratios with the supplied fluid pressure, respectively, and one of said modulating means including means responsive to the supplied and applied fluid pressure of a common predetermined value to thereafter effect the blending of the supplied and applied fluid pressures.

Claim 3

A control valve comprising a housing, a pair oF flow passages in said housing and connected in parallel flow relation, a pair of modulating means movable in said flow passages for performing modulating operations on fluid pressure supplied thereto and interrupting flow thereof through said flow passages upon preselected conditions, respectively, each of said modulating means being generally operable to interrupt flow of the supplied fluid pressure through said flow passages upon the modulating operation of the other of said modulating means to effect applications through said flow passages of reduced fluid pressures in different predetermined ratios with the supplied fluid pressure, respectively, and one of said modulating means including means responsive to the supplied and applied fluid pressures of a predetermined value to open one of said flow passages and effect an unmodulated flow therethrough of the supplied fluid pressure.

Claim 4

A control valve comprising a housing, a pair oF flow passages in said housing and connected in parallel flow relation, a pair of modulating means movable in said flow passages for performing modulating operations on fluid pressure supplied thereto and interrupting flow thereof through said flow passages upon preselected conditions, respectively, each of said modulating means being generally operable to interrupt flow of the supplied fluid pressure through said flow passages upon the modulating operation of the other of said modulating means to effect applications through said flow passages of reduced fluid pressures in different predetermined ratios with the supplied fluid pressure, respectively, and one of said modulating means including means responsive to the supplied and applied fluid pressures of a predetermined value to open one of said flow passages and effect an unmodulated flow therethrough of the supplied fluid pressure.

Claim 5

A control valve comprising a housing, proportioning means and metering means movable in said housing in parallel flow relation for performing proportioning and metering operations on fluid pressure supplied thereto and for interrupting said parallel flow relation under preselected conditions, respectively, said proportioning means being operable generally in response to the supplied fluid pressure between first and second predetermined values to effect the application through said housing of a reduced fluid pressure in a predetermined ratio with the supplied fluid pressure when said metering means is interrupting said parallel flow relation, and said metering means being thereafter generally operable in response to the supplied fluid pressure in excess of the second predetermined value and the applied fluid pressure acting thereon to effect a metering application through said housing of the supplied fluid pressure to increase the applied fluid pressure in another predetermined ratio with the supplied fluid pressure predeterminately greater than the first named predetermined ratio when said proportioning means is interrupting said parallel flow relation, and said metering means including means responsive to the supplied and applied fluid pressures of a third predetermined value predeterminately greater than the second predetermined value to thereafter effect an unmetered flow through said housing of the supplied fluid pressure.

Claim 6

A control valve comprising a housing, proportioning means and metering means movable in said housing in parallel flow relation for performing proportioning and metering operations on fluid pressure supplied thereto and for interrupting said parallel flow relation under preselected conditions, respectively, said proportioning means being operable generally in response to the supplied fluid pressure between first and second predetermined values to effect the application through said housing of a reduced fluid pressure in a predetermined ratio with the supplied fluid pressure when said metering means is interrupting said parallel flow relation, and said metering means being thereafter generally operable in response to the supplied fluid pressure in excess of the second predetermined value and the applied fluid pressure acting thereon to effect a metering application through said housing of the supplied fluid pressure to increase the applied fluid pressure in another predetermined ratio with the supplied fluid pressure predeterminately greater than the first named predetermined ratio when said proportioning means is interrupting said parallel flow relation, and said metering means including means responsive to the supplied and applied fluid pressures of a third predetermined value predeterminately greater than the second predetermined value to thereafter effect an unmetered flow through said housing of the supplied fluid pressure.

Claim 7

A control valve according to claim 3, comprising a pair of flow passages in said housing and connected in parallel flow relation, said proportioning and metering means being movable in said flow passages and controlling the applications therethrough of the supplied fluid pressure, respectively.

Claim 8

A control valve according to claim 4, wherein said included means opens one of said flow passages to effect the unmetered flow therethrough of the supplied fluid pressure when the supplied and applied fluid pressures attain the third predetermined value.

Claim 9

A control valve according to claim 4, wherein said proportioning means includes resiliently urged means movable in one of said flow passages, said resiliently urged means being movable against its own force in response to the supplied fluid pressure of the first predetermined value acting thereon toward a flow interrupting position in said one passage means and being further movable assisted by its own force in response to increases in the supplied fluid pressure in excess of the first predetermined value toward another position effecting the increase in the applied fluid pressure in the first named predetermined ratio, and said resiliently urged means retaining its flow interrupting position in said one flow passage when the supplied fluid pressure exceeds the second predetermined value to effect the metering operation of said metering means in the other of said flow passages.

Claim 10

A control valve according to claim 6, wherein said resiliently urged means includes piston means movable in said one passage means, and resilient means engaged with said piston means, said piston means being movable against saiD resilient means in response to the supplied fluid pressure of the first predetermined value acting on said piston means toward its flow interrupting position closing said one passage means and being thereafter further movable assisted by said resilient means in response to the increased supplied fluid pressure in excess of said first predetermined value and less than said second predetermined value toward its other position effecting the increase in the applied fluid pressure in the first named ratio, and said piston means maintaining its flow interrupting position in said one flow passage when the supplied fluid pressure exceeds the second predetermined value effecting the metering operation of said metering means in said other flow passage.

Claim 11

A control valve according to claim 4, comprising seating means in said housing about said one flow passage, and valve means on said piston means for engagement with said seating means, said valve means being engaged with said seating means to close said one passage means when said piston means is in its flow interrupting position and said valve means being disengaged from said seating means upon the movement of said piston means toward its other position.

Claim 12

A control valve according to claim 4, wherein said metering means also includes resiliently urged means movable on one of said flow passages, and said included means defines a pair of additive effective areas on said resiliently urged means for respective subjection to the supplied and applied fluid pressures in said flow passages, said resiliently urged means being movable against its own force from its flow interrupting position in said one flow passage in response to the supplied fluid pressure in excess of the second predetermined value and the applied fluid pressure respectively acting on said areas toward a metering position effecting the metered increase in the applied fluid pressure in the other predetermined ratio with the supplied fluid pressure, and said resiliently urged means also being movable against its own force toward an open position in said one flow passage effecting the unmetered flow therethrough of the supplied fluid pressure when the supplied and applied fluid pressures respectively acting on said areas attain the third predetermined value.

Claim 13

A control valve according to claim 9, wherein said resiliently urged means include piston means movable in said one flow passage, resilient means engaged with said piston means, one of said areas being on said piston means and subjected to the supplied fluid pressure, diaphragm means in said housing subjected to the applied fluid pressure for connection with said piston means and defining the other of said areas, said piston means being movable from its flow interrupting position against said resilient means in response to the supplied fluid pressure in excess of the second predetermined value acting on said one area and the applied fluid pressure acting on said other area toward its metering position, and said piston means also being movable toward its open position against said resilient means when the supplied and applied fluid pressures respectively acting on said one and other areas attains the third predetermined value.

Claim 14

A control valve according to claim 10, comprising a valve seat in said housing about said one flow passage, and valve means on said piston means for engagement with said valve seat, said valve means being engaged with said valve seat to close said one flow passage when said piston means is in its flow interrupting position and said valve means being disengaged from said valve seat upon the movement of said piston means toward its metering and open positions.

Claim 15

A control valve according to claim 3, comprising passage means in said metering means for the passage therethrough of the supplied fluid pressure less than the first predetermined value, a valve seat on said metering means about said passage means, valve means on said metering means for engagement with said valve seat, saiD included means including diaphragm means subjected to the applied fluid pressure and connected with said valve means, said diaphragm means being responsive to applied fluid pressure of the first predetermined value to move said valve means toward engagement with said valve seat and close said passage means when said metering means is in its flow interrupting position.

Claim 16

A control valve comprising a housing having inlet and outlet ports therein, a pair of passage means in said housing connected in parallel flow relation between said inlet and outlet ports, a proportioning valve and a metering valve respectively movable in said passage means for controlling pressure fluid communication between said inlet and outlet ports, said proportioning valve being movable in response to fluid pressure at said inlet port in excess of a first predetermined value and less than a second predetermined value from a position interrupting pressure fluid communication through one of said passage means toward a position effecting metered pressure fluid communication therethrough to establish a reduced fluid pressure at said outlet port in a predetermined ratio with that at said inlet port when said metering valve is in a position interrupting pressure fluid communication through the other of said passage means, said metering valve being thereafter movable from its pressure fluid communication interrupting position in said other passage means in response to fluid pressure at said inlet port in excess of the second predetermined value and reduced fluid pressure at said outlet port acting thereon toward a position effecting metered pressure fluid communication through said other flow passage to increase the reduced fluid pressure at said outlet port in another predetermined ratio with that at said inlet port predeterminately greater than said first named predetermined ratio when said proportioning valve is in its pressure fluid communication interrupting position, and said metering valve including means responsive to the fluid pressures at said inlet and outlet ports of a third predetermined value to move said metering means toward an open position in said other passage means effecting unmetered pressure fluid communication therethrough between said inlet and outlet ports.

Claim 17

A control valve comprising a housing having inlet and outlet ports therein, a pair of passage means in said housing connected in parallel flow relation between said inlet and outlet ports, a proportioning valve and a metering valve respectively movable in said passage means for controlling pressure fluid communication between said inlet and outlet ports, said proportioning valve being movable in response to fluid pressure at said inlet port in excess of a first predetermined value and less than a second predetermined value from a position interrupting pressure fluid communication through one of said passage means toward a position effecting metered pressure fluid communication therethrough to establish a reduced fluid pressure at said outlet port in a predetermined ratio with that at said inlet port when said metering valve is in a position interrupting pressure fluid communication through the other of said passage means, said metering valve being thereafter movable from its pressure fluid communication interrupting position in said other passage means in response to fluid pressure at said inlet port in excess of the second predetermined value and reduced fluid pressure at said outlet port acting thereon toward a position effecting metered pressure fluid communication through said other flow passage to increase the reduced fluid pressure at said outlet port in another predetermined ratio with that at said inlet port predeterminately greater than said first named predetermined ratio when said proportioning valve is in its pressure fluid communication interrupting position, and said metering valve including means responsive to the fluid pressures at said inlet and outlet ports of a third predetermined value to move said metering means toward an open position in said other passage means effecting unmetered pressure fluid communication therethrough between said inlet and outlet ports.

Claim 18

A control valve comprising a housing having inlet and outlet ports therein, first and second passage means in said housing and respectively connected in parallel flow relation between said inlet and outlet ports, first and second valve seats in said housing about said first and second passage means, first and second piston means movable in said first and second passage means for controlling pressure fluid communication therethrough between said inlet and outlet ports, respectively, first and second valve means on said first and second piston means for engagement with said first and second valve seats, first and second spring means engaged with said first and second piston means, said second spring means urging said second piston means toward a position engaging said second valve means with said second valve seat for interrupting pressure fluid communication through said second passage means between said inlet and outlet ports, said first piston means being initially movable against said first spring means in response to fluid pressure at said inlet and outlet ports of a first predetermined value to engage said first valve means with said first valve seat interrupting pressure fluid communication between said inlet and outlet ports through said first passage means and said first piston means also being thereafter further movable assisted by said first spring means in response to fluid pressure at said inlet port in excess of the first predetermined value and less than a second predetermined value to disengage said first valve means from said first valve seat effecting metered pressure fluid communication through said first passage means between said inlet and outlet ports and establishing a metered fluid pressure at saiD outlet port in a first predetermined ratio with that at said inlet port when said second piston means is in its pressure fluid communication interrupting position, a pair of effecting areas on said second piston means respectively subjected to the fluid pressures at said inlet and outlet ports, said second piston means being movable from its pressure fluid communication interrupting position against said second spring means in response to the fluid pressure at said inlet port in excess of the second predetermined value acting on one of said areas and the reduced metered fluid pressure at said outlet port acting on the other of said areas to disengage said second valve means from said second valve seat effecting metered pressure fluid communication between said inlet and outlet ports through said second passage means and establishing an increased metered fluid pressure at said outlet port in a second predetermined ratio with that at said inlet port wherein said second predetermined ratio is predeterminately greater than said first predetermined ratio when said first piston means is in its pressure fluid communication interrupting position, and said second piston means also being further movable against said second spring means to disengage said second valve means from said second valve seat and establish open pressure fluid communication through said second passage means between said inlet and outlet ports when the fluid pressure at said inlet port and the metered fluid pressure at said outlet port acting on said one and other areas attain a third predetermined value predeterminately greater than said second predetermined value, respectively.

Claim 19

A control valve comprising a housing having inlet and outlet ports therein, first and second passage means in said housing and respectively connected in parallel flow relation between said inlet and outlet ports, first and second valve seats in said housing about said first and second passage means, first and second piston means movable in said first and second passage means for controlling pressure fluid communication therethrough between said inlet and outlet ports, respectively, first and second valve means on said first and second piston means for engagement with said first and second valve seats, first and second spring means engaged with said first and second piston means, said second spring means urging said second piston means toward a position engaging said second valve means with said second valve seat for interrupting pressure fluid communication through said second passage means between said inlet and outlet ports, said first piston means being initially movable against said first spring means in response to fluid pressure at said inlet and outlet ports of a first predetermined value to engage said first valve means with said first valve seat interrupting pressure fluid communication between said inlet and outlet ports through said first passage means and said first piston means also being thereafter further movable assisted by said first spring means in response to fluid pressure at said inlet port in excess of the first predetermined value and less than a second predetermined value to disengage said first valve means from said first valve seat effecting metered pressure fluid communication through said first passage means between said inlet and outlet ports and establishing a metered fluid pressure at saiD outlet port in a first predetermined ratio with that at said inlet port when said second piston means is in its pressure fluid communication interrupting position, a pair of effecting areas on said second piston means respectively subjected to the fluid pressures at said inlet and outlet ports, said second piston means being movable from its pressure fluid communication interrupting position against said second spring means in response to the fluid pressure at said inlet port in excess of the second predetermined value acting on one of said areas and the reduced metered fluid pressure at said outlet port acting on the other of said areas to disengage said second valve means from said second valve seat effecting metered pressure fluid communication between said inlet and outlet ports through said second passage means and establishing an increased metered fluid pressure at said outlet port in a second predetermined ratio with that at said inlet port wherein said second predetermined ratio is predeterminately greater than said first predetermined ratio when said first piston means is in its pressure fluid communication interrupting position, and said second piston means also being further movable against said second spring means to disengage said second valve means from said second valve seat and establish open pressure fluid communication through said second passage means between said inlet and outlet ports when the fluid pressure at said inlet port and the metered fluid pressure at said outlet port acting on said one and other areas attain a third predetermined value predeterminately greater than said second predetermined value, respectively.

Claim 20

A fluid pressure system comprising a friction device, a fluid pressure source for energizing said friction device, a pair of modulating means in parallel flow relation in said system for performing modulating operations on fluid pressure supplied from said source to said friction device under preselected conditions, each of said modulating means being generally operable to interrupt the parallel flow relation when the other thereof is performing its modulating operation, respectively.

Claim 21

A fluid pressure system comprising a friction device, a fluid pressure source for energizing said friction device, a pair of modulating means in parallel flow relation in said system for performing modulating operations on fluid pressure supplied from said source to said friction device under preselected conditions, each of said modulating means being generally operable to interrupt the parallel flow relation when the other thereof is performing its modulating operation, respectively.

Claim 22

A fluid pressure system comprising at least one friction device, a fluid pressure source for supplying fluid pressure to said friction device to effect energization thereof, a pair of modulating means connected between said source and friction device in parallel flow relation for performing modulating operations on fluid pressure supplied from said source to said friction device under preselected conditions, each of said modulating means being generally operable to interrupt the parallel flow relation upon the modulating operation of the other thereof to effect the application to said friction device of the supplied fluid pressure in different predetermined ratios, respectively, and one of said modulating means including means responsive to the supplied fluid pressure in excess of a predetermined value to obviate the modulating operation of said one modulating means.

Claim 23

A fluid pressure system comprising at least one friction device, a fluid pressure source for supplying fluid pressure to said friction device to effect energization thereof, a pair of modulating means connected between said source and friction device in parallel flow relation for performing modulating operations on fluid pressure supplied from said source to said friction device under preselected conditions, each of said modulating means being generally operable to interrupt the parallel flow relation upon the modulating operation of the other thereof to effect the application to said friction device of the supplied fluid pressure in different predetermined ratios, respectively, and one of said modulating means including means responsive to the supplied fluid pressure in excess of a predetermined value to obviate the modulating operation of said one modulating means.

Claim 24

A fluid pressure system comprising at least one fluid pressure responsive brake device, means including a fluid pressure source for supplying fluid pressure to said brake device to effect energization thereof, proportioning means and metering means connected in parallel flow relation with each other between said source and brake device for performing proportioning and metering operations on the supplied fluid pressure and for interrupting said parallel flow relation under preselected conditions, respectively, said proportioning means being operable generally in response to the supplied fluid pressure between first and second predetermined values to effect the application to said brake device of a reduced fluid pressure in a predetermined ratio with the supplied fluid pressure when said metering means is interrupting said parallel flow relation, said metering means being thereafter generally operable in response to the supplied fluid pressure in excess of the second predetermined value and the applied fluid pressure acting thereon to effect a metered increase in the applied fluid pressure in another predetermined ratio with the supplied fluid pressure predeterminately greater than the first named predetermined ratio when said proportioning means is interrupting said parallel flow relation, and said metering means including means responsive to the supplied and applied fluid pressures of a third predetermined value predeterminately greater than the second predetermined value for obviating the metering operation of said metering means and effecting an unmetered flow of the supplied fluid pressure to said brake device.

Claim 25

A fluid pressure system comprising at least one fluid pressure responsive brake device, means including a fluid pressure source for supplying fluid pressure to said brake device to effect energization thereof, proportioning means and metering means connected in parallel flow relation with each other between said source and brake device for performing proportioning and metering operations on the supplied fluid pressure and for interrupting said parallel flow relation under preselected conditions, respectively, said proportioning means being operable generally in response to the supplied fluid pressure between first and second predetermined values to effect the application to said brake device of a reduced fluid pressure in a predetermined ratio with the supplied fluid pressure when said metering means is interrupting said parallel flow relation, said metering means being thereafter generally operable in response to the supplied fluid pressure in excess of the second predetermined value and the applied fluid pressure acting thereon to effect a metered increase in the applied fluid pressure in another predetermined ratio with the supplied fluid pressure predeterminately greater than the first named predetermined ratio when said proportioning means is interrupting said parallel flow relation, and said metering means including means responsive to the supplied and applied fluid pressures of a third predetermined value predeterminately greater than the second predetermined value for obviating the metering operation of said metering means and effecting an unmetered flow of the supplied fluid pressure to said brake device.