Reservoir purge valve

A valve for purging contaminants from an air reservoir on a vehicle, comprising:

• a housing comprising an inlet, an exhaust, and a control port, wherein the inlet is configured for connection to an air reservoir, wherein the control port is configured for connection to a vehicle emergency brake system comprising at least one emergency brake, wherein the housing further comprises a bracket configured for mounting the housing to a surface, and wherein central axes of the inlet, the exhaust, and the control port are spaced from the bracket in a direction that is perpendicular to the central axes of the inlet, the exhaust, and the control port;
• and
• a diaphragm positioned within the housing, wherein at least a portion of the diaphragm is moveable between an open position, in which the inlet and exhaust are in fluid communication, and a closed position, in which the diaphragm blocks fluid from flowing between the inlet and the exhaust, wherein the control port is configured so that control port fluid from the vehicle emergency brake system entering the control port exerts a control port force on the diaphragm, wherein the inlet is configured so that inlet fluid entering the inlet exerts an inlet force on the diaphragm, wherein a biasing force is exerted on the diaphragm, and wherein the diaphragm is configured to move from the closed position to the open position when the inlet force is greater than the sum of the biasing force and the control port force.