Safety valve device for multiple circuit fluid pressure operable brake system

A safety valve device for a multiple fluid pressure operable brake system, said safety valve device comprising:

• a. a casing having an inlet port connected to a source of fluid under pressure and a plurality of outlet ports connected to a plurality of fluid pressure circuits each requiring a predetermined degree of operating fluid pressure, respectively, said circuits being communicable with said inlet port via supply passageways;
• b. respective cut-out valves interposed in said supply passageways between said fluid pressure circuits and said inlet port and being operable to respective open positions responsively to fluid pressure in the supply passageways at degrees corresponding to those required by the pressure circuits, respectively, for opening communication through the supply passageways between said pressure circuits and said inlet port;
• c. bypassing passageways means interposed in said supply passageways for providing restricted flow of fluid pressure from said inlet to said fluid pressure circuits in bypassing relation to the cut-out valves, respectively;
• and
• d. a plurality of check valves interposed, respectively, between said several fluid pressure circuits for providing flow of fluid pressure thereto in one direction from said supply passageways and for inhibiting flow of fluid pressure in an opposite direction from certain selected ones of said circuits to the remaining circuits in the event of failure of fluid pressure in said certain selected ones of said circuits.