A starter air valve comprising: a housing comprising an inlet at a first end, an outlet at a second end opposite the first end, and a center portion between the first end and the second end, the outlet being fluidly connected to the inlet through a fluid passage; a first piston located within the housing between the first end and the center portion, the first piston comprising: a first cupped portion configured to form a first chamber with the housing proximate the first end; and a second piston located within the housing between the second end and the center portion, the second piston being configured to form a second chamber with the first piston at the center portion and comprises: a third cupped portion configured to form a third chamber with the housing proximate the second end; and characterized by said first piston comprising a second cupped portion opposite the first cupped portion and said second piston comprising a fourth cupped portion opposite the third cupped portion, the fourth cupped portion being configured to form the second chamber with the second cupped portion; wherein the first piston is configured to regulate airflow through the fluid passage by adjusting at least one of a first pressure within the first chamber and a second pressure within the second chamber; wherein the second piston is configured to regulate airflow through the fluid passage by adjusting at least one of a third pressure within the third chamber and the second pressure within the second chamber. a housing comprising an inlet at a first end, an outlet at a second end opposite the first end, and a center portion between the first end and the second end, the outlet being fluidly connected to the inlet through a fluid passage; a first piston located within the housing between the first end and the center portion, the first piston comprising: a first cupped portion configured to form a first chamber with the housing proximate the first end; and a second piston located within the housing between the second end and the center portion, the second piston being configured to form a second chamber with the first piston at the center portion and comprises: a third cupped portion configured to form a third chamber with the housing proximate the second end; and characterized by said first piston comprising a second cupped portion opposite the first cupped portion and said second piston comprising a fourth cupped portion opposite the third cupped portion, the fourth cupped portion being configured to form the second chamber with the second cupped portion; wherein the first piston is configured to regulate airflow through the fluid passage by adjusting at least one of a first pressure within the first chamber and a second pressure within the second chamber; wherein the second piston is configured to regulate airflow through the fluid passage by adjusting at least one of a third pressure within the third chamber and the second pressure within the second chamber. a first cupped portion configured to form a first chamber with the housing proximate the first end; and a second piston located within the housing between the second end and the center portion, the second piston being configured to form a second chamber with the first piston at the center portion and comprises: a third cupped portion configured to form a third chamber with the housing proximate the second end; and characterized by said first piston comprising a second cupped portion opposite the first cupped portion and said second piston comprising a fourth cupped portion opposite the third cupped portion, the fourth cupped portion being configured to form the second chamber with the second cupped portion; wherein the first piston is configured to regulate airflow through the fluid passage by adjusting at least one of a first pressure within the first chamber and a second pressure within the second chamber; wherein the second piston is configured to regulate airflow through the fluid passage by adjusting at least one of a third pressure within the third chamber and the second pressure within the second chamber. a third cupped portion configured to form a third chamber with the housing proximate the second end; and characterized by said first piston comprising a second cupped portion opposite the first cupped portion and said second piston comprising a fourth cupped portion opposite the third cupped portion, the fourth cupped portion being configured to form the second chamber with the second cupped portion; wherein the first piston is configured to regulate airflow through the fluid passage by adjusting at least one of a first pressure within the first chamber and a second pressure within the second chamber; wherein the second piston is configured to regulate airflow through the fluid passage by adjusting at least one of a third pressure within the third chamber and the second pressure within the second chamber.