Control valve

Claim 2

In a split braking system having a split master cylinder for supplying separate fluid pressures to said split braking system; a control valve comprising a housing adapted to receive the separate supplied fluid pressures, a divider member in said housing including a pressure fluid flow passage therethrough for one of the supplied fluid pressures, proportioning means movable in said divider member for controlling said flow passage, said proportioning means being movable in response to the one supplied fluid pressure toward a metering position in said flow passage to effect a metered applied fluid pressure through said flow passage in a predetermined ratio with the one supplied fluid pressure, and a bypass passage in said divider member having one end connected with said flow passage and subjected to the applied fluid pressure and the other end thereof subjected to the one supplied fluid pressure, indicator means subjected to the applied fluid pressure and the other of the supplied fluid pressure and movable in said divider member for controlling said bypass passage, said indicator means being movable in response to the applied fluid pressure in said bypass passage acting thereon from a normal centered position toward one of opposed translated positions in said housing to open said bypass passage and establish pressure fluid communication therethrough between the one supplied fluid pressure and the applied fluid in bypass relation with said proportioning member to obviate the metering actuation thereof in the event of the failure of the other supplied fluid pressure acting on said indicator means, and centering means movable in said housing for engagement with said housing and with said indicator means and subjected to the one supplied fluid pressure, said centering means being urged in response to the one supplied fluid pressure acting thereon toward engagement with said housing and said indicator means to oppose movement of said indicator means from its centered position toward the other of its translated positions in response to the other supplied fluid pressure acting thereon.

Claim 3

A control valve according to claim 1, comprising first and second opposed end portions on said indicator means movable in said bypass passage and said housing and subjected to the applied fluid pressure and the other supplied fluid pressure, respectively, said first end portion normally interrupting pressure fluid communication through said bypass passage between the one supplied fluid pressure and the applied fluid pressure when said indicator means is in its centered position, said indicator means being movable to its one translated position in response to the applied fluid pressure acting on said first end portion upon the failure of the other supplied fluid pressure acting on said second end portion, and said first end portion being movable to a bypassing position opening said bypass passage to establish the pressure fluid communication therethrough between the one supplied fluid pressure and the applied fluid pressure upon the movement of said indicator means to its one translated position.

Claim 4

A control valve according to claim 2, comprising seal means normally engaged between said first end portion and said bypass passage to close said bypass passage and interrupt pressure fluid communication therethrough between the one supplied fluid pressure and the applied fluid pressure, said seal means being disengaged from one of said first end portion and said bypass passage upon the movement of said first end portion to its bypassing position.

Claim 5

A control valve according to claim 3, wherein said seal means is carried on said first end portion and disengaged from said bypass passage upon the movement of said first end portion to its bypassing position.

Claim 6

A control valve according to claim 1, comprising seal means normally engaged between said indicator means and said bypass passage to close said bypass passage and interrupt pressure fluid communication therethrough between the one supplied fluid pressure and the applied fluid pressure, said seal means being disengaged from one of said indicator means and bypass passage upon the movement of said indicator means to its one translated position to open said bypass passage and establish the pressure fluid communication therethrough between the one supplied fluid pressure and the applied fluid pressure.

Claim 7

A control valve according to claim 5, wherein said seal means is carried on said indicator means and disengaged from said bypass passage upon the movement of said indicator means to its one translated position.

Claim 8

A control valve according to claim 1, comprising a pair of stepped bores in said divider member defining a portion of said flow passage, said proportioning means being movable in one of said stepped bores, a valve seat on said divider member between said stepped bores for engagement with said proportioning means, said proportioning means being initially movable to its isolating position into engagement with said valve seat to isolate the one supplied fluid pressure in said one stepped bore from the applied fluid pressure in the other of said stepped bores and being thereafter further movable to its metering position disengaged from said valve seat to effect the metered increase in the applied fluid pressure, and said one end of said bypass passage being connected with said other stepped bore.

Claim 9

A control valve comprising a housing, a divider member in said housing and defining with said housing a pressure fluid flow passage therethrough for one of separate fluid pressures supplied to said housing, a pair of stepped bores in said divider member defining a portion of said flow passage, an annular shoulder on said divider member between said stepped bores, valve seating means about said flow passage and normally engaged with said shoulder, a proportioning piston movable in one of said stepped bores and having valve means thereon extending into the other of said bores for engagement with said valve seating means to control the application of the one supplied fluid pressure from said one stepped bore to said other stepped bore, resilient means engaged with said proportioning piston and normally urging said valve means toward a position disengaged from said valve seating means, opposed first and second effective areas on said proportioning piston for respective subjection to the one supplied fluid pressure and the applied fluid pressure, said proportioning piston being initially movable against the force of said resilient means in response to the one supplied fluid pressure and applied fluid pressure of a predetermined value respectively acting on said first and second areas toward a position engaging said valve means with said seating means and isolating the one supplied fluid pressure in said one stepped bore from the applied fluid pressure in said other stepped bore, said proportioning piston also being thereafter further movable against the applied fluid pressure acting on said second area in response to increases in the one supplied fluid pressure acting on said first area and assisted by the force of said resilient means toward a metering position disengaging said valve means from said seating means to effect a metered increase in the applied fluid pressure in a predetermined ratio with the increased one supplied fluid pressure in excess of the predetermined value, a bypass passage in said divider member having one end connected with said other stepped bore and the end thereof subjected to the one supplied fluid pressure, indicator means movable between a centered position and opposed translated positions in said housing for indicating a failure of the one supplied fluiD pressure and the other of the supplied fluid pressures including a first end portion movable in said housing and having a third effective area thereon subjected to the other supplied fluid pressure, a second end portion on said indicator means and opposed to said first end portion, said second end portion being movable in said divider member for controlling pressure fluid communication through said bypass passage between the one supplied fluid pressure and applied fluid pressure, a fourth effective area on said second end portion opposed to said third area and subjected to the applied fluid pressure, said indicator means being movable from its centered position toward one of its translated positions in response to the applied fluid pressure acting on said fourth area in the event of the failure of the other supplied fluid pressure acting on said third area, and said second end portion being movable toward a bypassing position in said bypass passage establishing open pressure fluid communication therethrough between the one supplied fluid pressure and the applied fluid pressure in bypass relation with said proportioning piston to obviate the metering function thereof when said indicator means is moved to its one translated position, a centering piston movable in said housing for engagement with said housing and said indicator means, and a fifth area on said centering piston opposed to said third are and subjected to the one supplied fluid pressure, said centering piston being urged in response to the one supplied fluid pressure acting on said fifth area toward engagement with said housing and said indicator means to oppose movement of said indicator means from its centered position toward the other of its translated positions in response to the other supplied fluid pressure acting on said third area.

Claim 10

A control valve comprising a housing, a divider member in said housing and defining with said housing a pressure fluid flow passage therethrough for one of separate fluid pressures supplied to said housing, a pair of stepped bores in said divider member defining a portion of said flow passage, an annular shoulder on said divider member between said stepped bores, valve seating means about said flow passage and normally engaged with said shoulder, a proportioning piston movable in one of said stepped bores and having valve means thereon extending into the other of said bores for engagement with said valve seating means to control the application of the one supplied fluid pressure from said one stepped bore to said other stepped bore, resilient means engaged with said proportioning piston and normally urging said valve means toward a position disengaged from said valve seating means, opposed first and second effective areas on said proportioning piston for respective subjection to the one supplied fluid pressure and the applied fluid pressure, said proportioning piston being initially movable against the force of said resilient means in response to the one supplied fluid pressure and applied fluid pressure of a predetermined value respectively acting on said first and second areas toward a position engaging said valve means with said seating means and isolating the one supplied fluid pressure in said one stepped bore from the applied fluid pressure in said other stepped bore, said proportioning piston also being thereafter further movable against the applied fluid pressure acting on said second area in response to increases in the one supplied fluid pressure acting on said first area and assisted by the force of said resilient means toward a metering position disengaging said valve means from said seating means to effect a metered increase in the applied fluid pressure in a predetermined ratio with the increased one supplied fluid pressure in excess of the predetermined value, a bypass passage in said divider member having one end connected with said other stepped bore and the end thereof subjected to the one supplied fluid pressure, indicator means movable between a centered position and opposed translated positions in said housing for indicating a failure of the one supplied fluiD pressure and the other of the supplied fluid pressures including a first end portion movable in said housing and having a third effective area thereon subjected to the other supplied fluid pressure, a second end portion on said indicator means and opposed to said first end portion, said second end portion being movable in said divider member for controlling pressure fluid communication through said bypass passage between the one supplied fluid pressure and applied fluid pressure, a fourth effective area on said second end portion opposed to said third area and subjected to the applied fluid pressure, said indicator means being movable from its centered position toward one of its translated positions in response to the applied fluid pressure acting on said fourth area in the event of the failure of the other supplied fluid pressure acting on said third area, and said second end portion being movable toward a bypassing position in said bypass passage establishing open pressure fluid communication therethrough between the one supplied fluid pressure and the applied fluid pressure in bypass relation with said proportioning piston to obviate the metering function thereof when said indicator means is moved to its one translated position, a centering piston movable in said housing for engagement with said housing and said indicator means, and a fifth area on said centering piston opposed to said third are and subjected to the one supplied fluid pressure, said centering piston being urged in response to the one supplied fluid pressure acting on said fifth area toward engagement with said housing and said indicator means to oppose movement of said indicator means from its centered position toward the other of its translated positions in response to the other supplied fluid pressure acting on said third area.

Claim 11

In a split braking system having a split master cylinder for supplying separate fluid pressures to said split braking system; a control valve comprising a housing adapted to receive the separate supplied fluid pressures, a divider member in said housing and defining therewith inlet and outlet chambers, said inlet chamber being subjected to one of the supplied fluid pressures, proportioning means movable in said divider member between said inlet and outlet chambers for controlling the application of the one supplied fluid pressure from said inlet chamber to said outlet chamber, said proportioning means being initially movable in response to the one supplied fluid pressure in said inlet chamber and the applied fluid pressure in said outlet chamber of a predetermined value toward a position isolating the one supplied fluid pressure in said inlet chamber from the applied fluid pressure in said outlet chamber and being thereafter further movable in response to increases in the one supplied fluid pressure in said inlet chamber toward a metering position effecting a metered increase in the applied fluid pressure in said outlet chamber in a predetermined ratio with the increased one supplied fluid pressure in excess of the predetermined value, a bypass passage in said divider member having one end connected with said outlet chamber and subjected to the applied fluid pressure and the other end thereof connected with said inlet chamber and subjected to the one supplied fluid pressure, another inlet chamber in said housing subjected to the other of the supplied fluid pressures, indicator means including an end portion movable in said housing and subjected to the other supplied fluid pressure in said other inlet chamber, another end portion opposed to said first-named end portion movable in said divider member for controlling pressure fluid communication through said said bypass passage between the one supplied fluid pressure in said first named inlet chamber and the applied fluid pressure in said outlet chamber, said other end portion being subjected to the applied fluid pressure in said bypass passage, said indicator means being movable from a normal centered position toward one of opposeD translated positions in said housing in response to the applied fluid pressure acting on said other end portion in the event of the failure of the other supplied fluid pressure in said other inlet chamber acting on said one end portion, and said other end portion being movable toward a position opening said bypass passage and establishing pressure fluid communication therethrough between the one supplied fluid pressure in said first named inlet chamber and the applied fluid pressure in said outlet chamber in bypass relation with said proportioning means to obviate the metering actuation thereof when said indicator means is moved to its one translated position, and centering means movable in said housing for engagement with said housing and said indicator means and subjected to the one supplied fluid pressure in said first-named inlet chamber, said centering means being urged in response to the one supplied fluid pressure in said first named inlet chamber acting thereon toward engagement with said housing and with said indicator means to oppose movement of said indicator means from its centered position toward the other of its translated positions in response to the other supplied fluid pressure in said other inlet chamber acting on said one end portion.

Claim 12

In a split braking system having a split master cylinder for supplying separate fluid pressures to said split braking system; a control valve comprising a housing adapted to receive the separate supplied fluid pressures, a divider member in said housing and defining therewith inlet and outlet chambers, said inlet chamber being subjected to one of the supplied fluid pressures, proportioning means movable in said divider member between said inlet and outlet chambers for controlling the application of the one supplied fluid pressure from said inlet chamber to said outlet chamber, said proportioning means being initially movable in response to the one supplied fluid pressure in said inlet chamber and the applied fluid pressure in said outlet chamber of a predetermined value toward a position isolating the one supplied fluid pressure in said inlet chamber from the applied fluid pressure in said outlet chamber and being thereafter further movable in response to increases in the one supplied fluid pressure in said inlet chamber toward a metering position effecting a metered increase in the applied fluid pressure in said outlet chamber in a predetermined ratio with the increased one supplied fluid pressure in excess of the predetermined value, a bypass passage in said divider member having one end connected with said outlet chamber and subjected to the applied fluid pressure and the other end thereof connected with said inlet chamber and subjected to the one supplied fluid pressure, another inlet chamber in said housing subjected to the other of the supplied fluid pressures, indicator means including an end portion movable in said housing and subjected to the other supplied fluid pressure in said other inlet chamber, another end portion opposed to said first-named end portion movable in said divider member for controlling pressure fluid communication through said said bypass passage between the one supplied fluid pressure in said first named inlet chamber and the applied fluid pressure in said outlet chamber, said other end portion being subjected to the applied fluid pressure in said bypass passage, said indicator means being movable from a normal centered position toward one of opposeD translated positions in said housing in response to the applied fluid pressure acting on said other end portion in the event of the failure of the other supplied fluid pressure in said other inlet chamber acting on said one end portion, and said other end portion being movable toward a position opening said bypass passage and establishing pressure fluid communication therethrough between the one supplied fluid pressure in said first named inlet chamber and the applied fluid pressure in said outlet chamber in bypass relation with said proportioning means to obviate the metering actuation thereof when said indicator means is moved to its one translated position, and centering means movable in said housing for engagement with said housing and said indicator means and subjected to the one supplied fluid pressure in said first-named inlet chamber, said centering means being urged in response to the one supplied fluid pressure in said first named inlet chamber acting thereon toward engagement with said housing and with said indicator means to oppose movement of said indicator means from its centered position toward the other of its translated positions in response to the other supplied fluid pressure in said other inlet chamber acting on said one end portion.

Claim 13

A control valve comprising a housing having a pair of inlet ports and an outlet port, a divider member in said housing including passage means connected between one of said inlet ports and said outlet port, proportioning means movable in said passage means for controlling the application of fluid pressure therethrough from said one inlet port to said outlet port, said proportioning means being initially movable in response to fluid pressures at said one inlet port and said outlet port of a predetermined value toward a position in said passage means isolating the respective fluid pressures at said one inlet port and said outlet port and being thereafter further movable in response to increases in the fluid pressure at said one inlet port toward a metering position effecting a metered increase in the fluid pressure at said outlet port in a predetermined ratio with the increased fluid pressure at said one inlet port, and bypass passage means in said divider member having one end connected with said first named passage means and subjected to the fluid pressure at said outlet port and the other end thereof connected with said one inlet port, indicator means including an end portion movable in said housing and subjected to the fluid pressure at the other of said inlet ports, another end portion opposed to said first named end portion movable in said divider member for controlling pressure fluid communication through said bypass passage means between said one inlet port and said outlet port and subjected to the fluid pressure at said outlet port, said indicator means being movable from a normal centered position toward one of opposed translated positions in said housing in response to the fluid pressure at said outlet port acting on said other end portion in the event of the failure of the fluid pressure at said other inlet port acting on said one end portion, and said other end portion being movable toward a position in said bypass passage establishing open pressure fluid communication therethrough between the fluid pressures at said one inlet port and said outlet port in bypass relation with said proportioning means to obviate the metering actuation thereof when said indicator means is moved to its one translated position, and centering means movable in said housing for engagement with said housing and said indicator means and subjected to the fluid pressure at said one inlet port, said centering means being urged in response to the fluid pressure at said one inlet port acting thereon toward engagement with said housing and with said indicator means to oppose movement of said indicator means from its centered position toward the other of its translated positions in response to the fluid pressure at said other inlet port acting oN said one end portion.

Claim 14

A control valve comprising a housing having a pair of inlet ports and an outlet port, a divider member in said housing including passage means connected between one of said inlet ports and said outlet port, proportioning means movable in said passage means for controlling the application of fluid pressure therethrough from said one inlet port to said outlet port, said proportioning means being initially movable in response to fluid pressures at said one inlet port and said outlet port of a predetermined value toward a position in said passage means isolating the respective fluid pressures at said one inlet port and said outlet port and being thereafter further movable in response to increases in the fluid pressure at said one inlet port toward a metering position effecting a metered increase in the fluid pressure at said outlet port in a predetermined ratio with the increased fluid pressure at said one inlet port, and bypass passage means in said divider member having one end connected with said first named passage means and subjected to the fluid pressure at said outlet port and the other end thereof connected with said one inlet port, indicator means including an end portion movable in said housing and subjected to the fluid pressure at the other of said inlet ports, another end portion opposed to said first named end portion movable in said divider member for controlling pressure fluid communication through said bypass passage means between said one inlet port and said outlet port and subjected to the fluid pressure at said outlet port, said indicator means being movable from a normal centered position toward one of opposed translated positions in said housing in response to the fluid pressure at said outlet port acting on said other end portion in the event of the failure of the fluid pressure at said other inlet port acting on said one end portion, and said other end portion being movable toward a position in said bypass passage establishing open pressure fluid communication therethrough between the fluid pressures at said one inlet port and said outlet port in bypass relation with said proportioning means to obviate the metering actuation thereof when said indicator means is moved to its one translated position, and centering means movable in said housing for engagement with said housing and said indicator means and subjected to the fluid pressure at said one inlet port, said centering means being urged in response to the fluid pressure at said one inlet port acting thereon toward engagement with said housing and with said indicator means to oppose movement of said indicator means from its centered position toward the other of its translated positions in response to the fluid pressure at said other inlet port acting oN said one end portion.