Abstract: A check valve is provided having a valve body and a sealing assembly within the valve body. The sealing assembly is biased, via a biasing force, in a seated position against a valve seat adjacent or surrounding an inlet port of the valve body. The sealing assembly includes an armature that has a proximal end and a distal end, and a sealing member that is pivotally attached to the distal end of the armature at a seal pivot joint. The proximal end of the armature is pivotally attached to the inner wall surface of the valve body at a wall pivot joint. Thus, the armature is a dual-hinged armature, providing at least two degrees of freedom, one translational and one rotational, for the sealing member to be properly seated against the valve seat. Effective sealing is thus achieved despite potentially imperfect alignment between the valve seat and the sealing assembly, and also despite a non-perfectly smooth valve seat.

Abstract: A video server apparatus is provided with a stream control section which determines a keyframe readout interval and a keyframe playback interval that satisfy a playback speed designated by a terminal apparatus. The video server apparatus transmits data of the thus-determined keyframe playback interval to the terminal apparatus. The video server apparatus reads out keyframes of a stored bit stream from at the thus-determined keyframe readout interval, and transmits a stream including the read-out keyframes to the terminal apparatus. The terminal apparatus decodes and displays the transmitted stream at the received keyframe playback interval. This system can correctly perform a playback at an arbitrary speed that is designated by the terminal apparatus.