Valve and gas control device

A valve comprising:

• a first plate having a plurality of first vent holes and a first principal surface;
• a side wall plate;
• a second plate having a second principal surface and a plurality of second vent holes, wherein the first plate and the second plate are disposed on opposite sides of the side wall plate with the first principal surface facing the second principal surface and wherein the first plate, the second plate and the side wall plate define a valve chamber;
• and
• a third plate disposed in the valve chamber and having a plurality of third vent holes, a third principal surface facing the first principal surface and a fourth principal surface facing the second principal surface, wherein in a direction perpendicular to the first principal surface the plurality of third vent holes at least partially overlaps the plurality of first vent holes and does not overlap the plurality of second vent holes,
• wherein the second plate and the third plate are positioned such that when viewed in the direction perpendicular to the first principal surface:
• each second vent hole is surrounded by at least three adjacent third vent holes,
• a first distance from a center of gravity of the second vent hole to an outer peripheral edge of the second vent hole is shortest in a first direction connecting the center of gravity of the second vent hole and a center of gravity of a nearest adjacent third vent hole, and
• in a predetermined direction other than the first direction, a second distance from the center of gravity of the second vent hole to the outer peripheral edge of an adjacent second vent hole is longer than the first distance.

A valve comprising:

• a first plate having a plurality of first vent holes and a first principal surface;
• a side wall plate;
• a second plate having a second principal surface and a plurality of second vent holes, wherein the first plate and the second plate are disposed on opposite sides of the side wall plate with the first principal surface facing the second principal surface and wherein the first plate, the second plate and the side wall plate define a valve chamber;
• and
• a third plate disposed in the valve chamber and having a plurality of third vent holes, a third principal surface facing the first principal surface and a fourth principal surface facing the second principal surface, wherein when viewed in a direction perpendicular to the first principal surface the plurality of third vent holes at least partially overlaps the plurality of first vent holes and does not overlap the plurality of second vent holes,
• wherein the second plate and the third plate are positioned such that when viewed in the direction perpendicular to the first principal surface:
• each second vent hole is surrounded by at least three adjacent third holes,
• a first distance from a center of gravity of a respective third vent hole to an outer peripheral edge of the third vent hole is shortest in a first direction connecting the center of gravity of the third vent hole and a center of gravity of a nearest adjacent second vent hole, and
• in a predetermined direction other than the first direction, a second distance from the center of gravity of a respective second vent hole to an outer peripheral edge of the adjacent second vent hole is longer than the first distance.