Rotary valve and quick exhaust valve for railway vehicle

A rotary valve in which outflow/inflow ports and a discharge port are formed in a valve body accommodating part having a spherical surface part or a tapered surface part formed on part of an inner periphery in a body, a valve body is rotatably inserted from an opening which is open from the valve body accommodating part, a spherically-shaped surface part or a tapered-shaped surface part is formed on an outer periphery of this valve body at a position opposing the spherical surface part or the tapered surface part, a plurality of through ports communicating the outflow/inflow ports or the discharge port and an attachment groove opposing the outflow/inflow ports in a direction crossing these through ports are further formed, a seal member for closing the outflow/inflow ports or the discharge port is attached to this attachment groove, any one of the outflow/inflow ports or the discharge port is hermetically sealed and closed by the seal member when the opening is covered with a lid member, the outflow/inflow ports and the discharge port or the outflow/inflow ports are provided so as to be able to communicate mutually via the through ports, also a retaining ring is interposed between a lower inner circumferential surface, which is the opening of the valve body accommodating part, and a lower outer circumferential surface of the valve body, and this retaining ring is attached between the valve body and the lid member.