System for installing three-port fluid elements in conduit circuits

Claim 1

A seat member for a conduit coupling assembly, said seat member having a coaxial pair of end faces, said end faces forming sealing surfaces that mate with conduit ends, said end faces being spaced apart by a substantially cylindrical body, said body being substantially coaxial with said end faces, said seat member having: a. a first part and a second part, said parts being joined in a plane that is perpendicular to the axis of said end faces; b. said first part having three bores in expanding sequence, the first and smallest of said bores opening at the end face of said first part and the third and largest of said bores opening in said perpendicular plane, adjacent bores being connected by annular surfaces; c. said first part further having cylindrical grooves in the surface of said cylindrical body, the first of said grooves being between said end face of said first part and a second groove, said first groove communicating with the second bore in said first part through radial holes in said body, and said second groove being adapted to retain an elastic sealing ring, said ring being adapted in said coupling assembly to prevent flow from said first groove to pass along said body; d. said second part having a bore that opens at the end face of said second part and having a passage that communicates said bore with said perpendicular plane; e. a partition that fits in said largest bore of said first part, said partition being held therein by the joining of said parts, a through hole being in said partition, said hole providing the flow path across said partition; and, f. means mating with said second bore in said first part and with said partition, said means being adapted to provide a fluid circuit element that operates on the flow between said first groove and said bores opening at said end faces.