A valve body member and various insert assemblies usable with the body member to form steam traps of different types are disclosed in this application. The body member includes an internally threaded,PLUG VALVES generally cylindrical recess extending inwardly from an outer surface and terminating in an end face, an inlet passage communicating with the recess thrugh a passageway terminating in the end face of the recess, and a discharge passage also communicating with the recess. An annular rib is formed on the end face of the recess around the passageway and includes a surface on which is seated a first sealing ring clamped in place by a first bearing surface of the particular insert assembly used to form the steam trap;Needle Valves an annular seat is formed on the outer surface of the body member around the cylindrical recess and this seat receives a second sealing ring which is clamped in place by a second bearing surface of the insert assembly. All of the insert assemblies further include a threaded portion that cooperates with the internally threaded portion of the recess to retain the insert assembly and the body member in assembled relationship.Hydraulic control valves Certain of the insert assemblies include a plurality of parts which are retained in assembled relationship by a retaining ring arrangement to facilitate assembly and disassembly of the insert assembly and the body member and all of the insert assemblies are arranged to retain the first sealing ring adjacent the first bearing surface to facilitate removal and insertion of the first sealing ring on the annular rib.

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