Patent ID: 7669830

Claim:
A valve comprising: a valve body including an inlet, an outlet, and a fluid flow passage therebetween; a poppet disposed in the valve body and movable between at least: a closed position, in which fluid is at least substantially restricted from flowing through the fluid flow passage; a partially open position, in which fluid is allowed to flow through the fluid flow passage at a first flow rate; and a full open position, in which fluid is allowed to flow through the fluid flow passage at a second flow rate that is greater than the first flow rate; a piston disposed in the valve body adjacent to the poppet, the piston moveable between a first position, in which the piston at least inhibits movement of the poppet from the closed position to the full open position, and a second position, in which the piston allows movement of the poppet from the closed position to the full open position; a poppet spring disposed adjacent to the poppet, the poppet spring configured to exert a poppet spring force against the poppet toward the closed position; and a piston spring disposed adjacent to the piston, the piston spring configured to exert a piston spring force against the piston toward the first position.