Valve including seal assembly retainer

A valve and method of assembling a valve, the valve being dead-end capable. The valve includes a valve body, a valve member, a seal and a retainer to prevent axial movement of the seal relative to the valve body. In one construction, the valve body defines a first groove extending about a portion of the circumference and an opening communicating with the first groove. The seal has an outer surface engageable with the valve body and defining a second groove. When the seal is positioned in the bore, the second groove is substantially co-extensive with at least a portion of the first groove to define a groove pocket. To prevent axial movement of the seal relative to the valve body, the retainer has a portion positionable in the first groove and an other portion positionable in the second groove. The retainer enters the groove pocket through the opening. Preferably, the valve further comprises a closing member for closing the opening to prevent the retainer from being removed from the groove pocket. In another construction, the valve body defines a groove on an upstream portion, and the seal includes a projection engageable in the groove to restrain axial movement of the seal relative to the valve body.