Systems, methods, and computer-readable media for enhancing the reliability of a pneumatically driven surgical tool by providing a redundant, backup pneumatic circuit for supplying the surgical tool with pneumatic pressure at a normal pressure.

Systems, methods, and computer-readable media for enhancing the reliability of a pneumatically driven surgical tool by providing a redundant, backup pneumatic circuit for supplying the surgical tool with pneumatic pressure at a normal pressure.

A valve assembly for receiving a fluid under pressure and comprising a plurality of valves in a single valve block. The assembly may include a plurality of check valves and including a counterbalance generating valve and a 3-way valve and including a method of use. The assembly may include an adjustable counterbalance valve, a pilot-operated check valve and a 3-way valve or combinations thereof.

A valve assembly includes a plenum having first, second, and third air source ports, a flapper valve assembly pivotally movable between a first position, where the first air source port is closed by the flapper valve assembly and the second and third air source ports are open and in fluid communication, and a second position, where the second air source port is closed by the flapper valve assembly and the first and third air source ports are open and in fluid communication and a method of controlling fluid flow via a valve assembly.