Stackable valve system

A plurality of stackable valves where each valve is characterized by:

• an operating chamber ring (108) having a flat ring shaped body with a plurality of tabs (230) where the plurality of tabs (230) are spaced around the outer perimeter of the flat ring shaped body and extend downward from a bottom side of the flat ring shaped body;
• a control chamber ring (106) stacked on top of the operating chamber ring (108) where the control chamber ring (106) has a flat ring shaped top with a first cylindrical section (344) extending downward from an outer diameter of the flat ring shaped top and a second cylindrical section (346) extending downward from an inner diameter of the flat ring shaped top and where a bottom of the first cylindrical section (344) rest on a top side of the operating chamber ring (108) and where a plurality of slots (450) are formed in the bottom of the first cylindrical section (344);
• a valve piston (110) captured between the operating chamber ring (108) and the control chamber ring (106) where the valve piston (110) has a generally flat disk shaped top with a third cylindrical section extending downwards at an inner diameter of the generally flat disk shaped top and where a bottom surface (466) of the third cylindrical section forms a sealing surface (466), the valve piston (110) configured to move between an open position and a closed position by moving along the cylindrical axis of the third cylindrical section.