| 摘要 |
<p>FOUR-WAY VALVE A four-way valve for use in a railroad air brake system has a housing with an internal chamber and a plurality of ports in communication with the chamber. Two of the ports are adapted for connection to a railroad car brake pipe with an intermediate port being adapted for connection to the railroad car air brake system. A valve member is movable within the chamber between a plurality of positions, there being a position to close each port and a neutral position in which all ports are in communication with the chamber. The improvement is specifically directed to a seal member carried by the valve member and spring means which urge the seal member outwardly of the valve member and toward the described ports. Each port has seal means which include a floating seal ring within each port, with each floating seal ring being positioned for sealing contact with the valve member seal member.</p> |
