| 摘要 |
<p>An air relay valve including an enclosed housing separated into an air supply chamber and a control chamber by a flexible diaphragm Air pressure introduced into the control chamber flexes the diaphragm into the air supply chamber. This opens the air supply chamber to an air pressure source with ports directing the air pressure from the air supply chamber into air lines that activate, e.g., air brakes. The relay valve is further designed whereby the inlet from the air pressure source is kept open until the pressure on both sides of the diaphragm are equalized causing return of the diaphragm and automatic closing of the air pressure source. The present invention is characterized in providing a diaphragm wherein the two sides have equal surface areas exposed to the air pressure so that automatic shut off occurs at the point when the p.s.i. of the air in the air lines substantially equals the p.s.i. of the air in the control chamber with exhausting of the air pressure occurring through an exhaust port in direct communication with the air supply chamber. A further improvement is the inclusion of a dampening chamber to dampen vibration of the diaphragm assembly.</p> |
