A hydraulic system for an aircraft includes a brake operation device, a pressure supply, a reservoir, a shut-off valve, and a wheel brake. The shut-off valve is in fluid communication with and is disposed between the pressure supply and the brake valve. The shut-off valve can include a poppet, a fir
A hydraulic system for an aircraft includes a brake operation device, a pressure supply, a reservoir, a shut-off valve, and a wheel brake. The shut-off valve is in fluid communication with and is disposed between the pressure supply and the brake valve. The shut-off valve can include a poppet, a first valve seat and a second valve seat. Movement of the poppet is controlled by operation of the brake operation device. The poppet is movable between a first position where the poppet acts against the first valve seat and a second position where the poppet acts against the second valve seat. In the first position, fluid flow is blocked between the pressure supply and the brake valve through the shut-off valve. In the second position, fluid flow is allowed between the pressure supply and the brake valve through the shut-off valve. The wheel brake is in fluid communication with and downstream from the shut-off valve.
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1. A hydraulic system for an aircraft comprising: a brake operation device;a pressure supply;a reservoir;a brake valve;a shut-off valve in fluid communication with and disposed between the pressure supply and the brake valve, the shut-off valve including a spool, a poppet on the spool, a first pisto
1. A hydraulic system for an aircraft comprising: a brake operation device;a pressure supply;a reservoir;a brake valve;a shut-off valve in fluid communication with and disposed between the pressure supply and the brake valve, the shut-off valve including a spool, a poppet on the spool, a first piston connected with the spool for movement therewith, a first valve seat, a first spring biasing the first piston and the poppet in a first direction toward the first valve seat, a second piston receiving the first piston, a second spring biasing the second piston in the first direction and a second valve seat each positioned in the shut-off valve, wherein movement of the poppet is controlled by operation of the brake operation device, wherein the poppet is movable between a first position where the poppet acts against the first valve seat and a second position where the poppet acts against the second valve seat, in the first position fluid flow is blocked between the pressure supply and the brake valve through the shut-off valve, in the second position fluid flow is allowed between the pressure supply and the brake valve through the shut-off valve; anda wheel brake in fluid communication with and downstream from the shut-off valve, wherein the wheel brake operates at a maximum fluid pressure and the wheel brake is at x % of the maximum pressure when the poppet is in the second position, where x %<100%;wherein the brake operation device includes a master cylinder and a pedal, wherein the master cylinder is in fluid communication with the shut-off valve;wherein with the poppet in the second position fluid is prevented from flowing between the pressure supply and the master cylinder. 2. The system of claim 1, wherein a speed of movement between the first position and the second position is proportionate to an operation speed of the brake operation device. 3. The system of claim 1, wherein the brake valve includes at least one of a brake metering valve and an anti-skid valve. 4. The system of claim 1, wherein the wheel brake is at least about 70% of the maximum pressure when the poppet is in the second position. 5. A hydraulic system for an aircraft comprising: a brake operation device;a pressure supply;a reservoir;a brake valve;a shut-off valve in fluid communication with and disposed between the pressure supply and the brake valve, the shut-off valve including a spool, a poppet on the spool, a first piston connected with the spool for movement therewith, a first valve seat, a first spring biasing the first piston and the poppet in a first direction toward the first valve seat, a second piston receiving the first piston, a second spring biasing the second piston in the first direction, and a second valve seat each positioned in the shut-off valve, wherein movement of the poppet is controlled by operation of the brake operation device, wherein the poppet is movable between a first position where the poppet acts against the first valve seat and a second position where the poppet acts against the second valve seat, in the first position fluid flow is blocked between the pressure supply and the brake valve through the shut-off valve, in the second position fluid flow is allowed between the pressure supply and the brake valve through the shut-off valve; anda wheel brake in fluid communication with and downstream from the shut-off valve, wherein the wheel brake operates at a maximum fluid pressure and the wheel brake is at x % of the maximum pressure when the poppet is in the second position, where x %<100%;wherein additional displacement of the brake operation device with the poppet in the second position results in brake pressures greater than x % up to 100% of the maximum brake pressure in the wheel brake,wherein x % is a function of a distance between the poppet and the second valve seat when the poppet is in the first position. 6. The system of claim 5, wherein x % is also a function of a biasing force of the first spring. 7. The system of claim 5, wherein the brake operation device includes a master cylinder and a pedal, wherein the master cylinder is in fluid communication with the shut-off valve, wherein the second piston which displaces in the shut-off valve when the poppet is in the second position to accommodate fluid from the master cylinder during additional displacement of the pedal after the poppet is in the second position. 8. A shut-off valve comprising: a housing including a bore, a master cylinder port, a pressure supply port, a system pressure port, and a return port, wherein each port connects with the bore and the bore includes a valve seat section and a piston receiving section, wherein the valve seat section is connected with the system pressure port, wherein the piston receiving section is connected with the return port;a first valve seat disposed in the valve seat section of the bore between the pressure supply port and the system pressure port;a second valve seat disposed in the valve seat section of the bore between the system pressure port and the master cylinder port;a spool disposed in the bore;a poppet on the spool, wherein the poppet moves with the spool and is disposed in the valve seat section for movement between the first valve seat and the second valve seat, wherein the poppet is movable between a first position where the poppet acts against the first valve seat and a second position where the poppet acts against the second valve seat, with the poppet in the second position fluid flow is blocked between the pressure supply and the master cylinder;a first piston disposed in the piston receiving section of the bore and connected with the spool for movement with the spool;a first spring disposed in the piston receiving section of the bore and biasing the first piston and the poppet in a first direction towards the first valve seat, wherein when pressure at the master cylinder port overcomes a biasing force of the first spring and pressure at the return port the first piston and the poppet travel in a second direction; anda second piston and a second spring each disposed in the piston receiving section of the bore and, the second piston including a second piston passage that receives the first piston, the second spring biasing the second piston in the first direction, the second piston travels with the first piston and the spool toward the second direction when the pressure at the master cylinder port is larger than a total force of the first spring, the second spring and pressure at the return port. 9. The shut-off valve of claim 8, further comprising a seal between the second valve seat and the master cylinder port, wherein the seal cooperates with the spool and the housing to block fluid flow through the bore from the pressure supply port and the system pressure port toward the master cylinder port. 10. The shut-off valve of claim 8, wherein the first piston includes a first extension and a second extension extending in opposite directions from a base, wherein an inner diameter of the first extension is larger than an outer diameter of the spool and a space between the inner diameter of the first extension and the outer diameter of the spool is connected with the master cylinder port. 11. The shut-off valve of claim 8, further comprising an inner piston seal disposed between the first piston and the second piston and an outer piston seal disposed between the second piston and the housing.
Gale, Allen R.; Arnold, Jeffrey K.; Blunt, Allan W.; McWilliams, Leo H., Anti-lock braking system module for aircraft equipped with master cylinder brake systems.
Pease ; Jr. George E. (Renton WA) Romero Ervin G. (Seattle WA) Glasenapp Rudi K. H. (Bellevue WA), Automatic aircraft braking system including wheelspeed responsive control apparatus.
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