Patent ID: 8397748

Claim:
A valve, comprising: a body; a cavity in the body; a check valve formed in the cavity, wherein the check valve comprises: a poppet having a first end and a second end, and a first seat and a second seat, wherein: the first seat is formed at the first end, the second seat is formed at the second end, a diameter of the second seat is greater than a diameter of the first seat, the second seat abuts a wall of the cavity around an entire circumference of the poppet when the poppet is in an open position to create a seal for preventing back-flowing fluid from reaching an area upstream from the second seat, and fluid exerting pressure at the first seat enters the valve through at least one same inlet as fluid exerting pressure on the second seat, and a relief valve formed adjacent the check valve, wherein the first seat rests on a portion of the relief valve when the check valve is in a closed position.