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 comprising: a third cupped portion configured to form a third chamber with the housing proximate the second end; 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 a 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 a fourth pressure within a fourth chamber, and characterized by said first piston comprising a second cupped portion opposite the first cupped portion, the second cupped portion being configured to form the second chamber with the housing proximate the center portion and said second piston comprising a fourth cupped portion opposite the third cupped portion, the fourth cupped portion being configured to form the fourth chamber with the housing proximate the center portion. 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 comprising: a third cupped portion configured to form a third chamber with the housing proximate the second end; 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 comprising: a third cupped portion configured to form a third chamber with the housing proximate the second end; 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 a 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 a fourth pressure within a fourth chamber, and characterized by said first piston comprising a second cupped portion opposite the first cupped portion, the second cupped portion being configured to form the second chamber with the housing proximate the center portion and said second piston comprising a fourth cupped portion opposite the third cupped portion, the fourth cupped portion being configured to form the fourth chamber with the housing proximate the center portion.