| 摘要 |
<p>A wasp excluder and exhaust port protector for railway air brake systems. A housing adapted to be screw connected to the exhaust port of an air brake system has a cylindrical bore in the outlet end portion. A valve having a unitary body of rubber-like material is wholly contained within the bore to provide mechanical protection for it. The body has a ring portion slidably fitted within the bore and sealed against a seat within the housing. The valve body has a disc portion integral with the ring and formed with a plurality of internally concave, externally convex, radially extending hollow ribs. The ribs have radial slits extending along the middle portions of the ribs and meeting in the center of the disc portion to define a plurality of elastic sectors connected to the ring portion. By this construction the walls of the hollow ribs provide reinforcing ridges along the edges of the sectors to maintain them in uniform abutting, non-overlapping relation by the elasticity of the material when there is no pressure in the housing. A retaining ring in the bore holds the valve in place and engages the outer radial ends of the hollow ribs to prevent the latter from expanding under air pressure and enabling the slits to open uniformly.</p> |
