Method and system of a valve

A valve assembly comprising:

• a valve body that comprises
• a first counter bore with a first diameter and a first central axis;
• a second counter bore disposed within the first counter bore, the second counter bore having a second central axis parallel to and offset from the first central axis, and the second diameter smaller than the first diameter;
• an inlet port fluidly coupled to the first counter bore;
• and
• an outlet port fluidly coupled to the second counter bore;
• a valve housing comprising
• a circular stem member that defines a third central axis;
• a piston receptacle member that defines a piston bore, the piston bore defines a fourth central axis perpendicular to the third central axis;
• a flow passage defined in the circular stem member, the flow passage fluidly coupled to the piston bore;
• the circular stem member disposed within the second counter bore;
• the piston receptacle member disposed within the first counter bore;
• and
• the second and third central axis coaxial;
• a piston that defines a proximal end and a distal end, the piston disposed in the piston bore of the valve housing;
• the valve assembly defines closed orientation by a first rotational orientation of the valve housing relative to the valve body, and the valve assembly defines an open orientation by a second rotational orientation of the valve housing distinct from the first rotational orientation.