Seal member for fluid transfer system

A rotary valve for selectively porting a fluid through one or more outlets, the rotary valve comprising:

• an upstream member having one or more outlet openings defined therethrough, and a downstream member having one or more outlet passageways defined therethrough, the downstream and upstream members separated by an intermediate space;
• and
• a seal member movably positioned in each outlet opening in the upstream member, each seal member comprising an elongate stem portion having provided at an upstream end thereof a resiliently deformable, radially-extending flange and at a downstream end thereof a sealing face, and a fluid passageway defined through the stem portion between the flange and the sealing face, the fluid passageway selectively communicating a fluid from the upstream member to the downstream member, and wherein the flange is deformable under fluid pressure in the upstream member to increase the area of contact between the flange and a first surface of the upstream member and to simultaneously move the stem portion within the outlet opening in the upstream member so as to bring the sealing face into sealing contact with an opposing surface of the downstream member across the intermediate space;
• and
• one or both of the upstream and downstream members being movable relative to each other to selectively align the fluid passageway of at least one of the one or more seal members with at least one of the one or more outlet passageways of the downstream member.