A valve stem coupling assembly for isolating a torque load from a thrust load comprising: a first stem; a second stem; a coupler comprising a first stem receiving channel, a second stem receiving channel aligned with the first stem receiving channel, a plurality of pin receiving channels oriented nonparallel the first and second stem receiving channels (320, 325) wherein the first stem is selectively coupled to the first stem receiving channel, the second stem is selectively coupled to the second stem receiving channel, a first securing pin selectively inserted in a first pin receiving channel of the plurality of pin receiving channels so as to secure the orientation of the first stem in the first stem receiving channel and a second securing pin selectively inserted in a second pin receiving channel of the plurality of pin receiving channels so as to secure the orientation of the second stem in the second stem receiving channel wherein the first and second stem (305, 310), first and second securing pin (335, 340) and coupler comprise the coupling assembly; wherein the coupler is configured to couple the first stem and the second stem so as to isolate a torque load and a thrust load; and characterised in that: a coupler end of the first stem comprises a forked receiving portion configured to receive the first securing pin at a variety of positions along in the forked receiving portion. a first stem; a second stem; a coupler comprising a first stem receiving channel, a second stem receiving channel aligned with the first stem receiving channel, a plurality of pin receiving channels oriented nonparallel the first and second stem receiving channels (320, 325) wherein the first stem is selectively coupled to the first stem receiving channel, the second stem is selectively coupled to the second stem receiving channel, a first securing pin selectively inserted in a first pin receiving channel of the plurality of pin receiving channels so as to secure the orientation of the first stem in the first stem receiving channel and a second securing pin selectively inserted in a second pin receiving channel of the plurality of pin receiving channels so as to secure the orientation of the second stem in the second stem receiving channel wherein the first and second stem (305, 310), first and second securing pin (335, 340) and coupler comprise the coupling assembly; a first stem receiving channel, a second stem receiving channel aligned with the first stem receiving channel, a plurality of pin receiving channels oriented nonparallel the first and second stem receiving channels (320, 325) wherein the first stem is selectively coupled to the first stem receiving channel, the second stem is selectively coupled to the second stem receiving channel, a first securing pin selectively inserted in a first pin receiving channel of the plurality of pin receiving channels so as to secure the orientation of the first stem in the first stem receiving channel and a second securing pin selectively inserted in a second pin receiving channel of the plurality of pin receiving channels so as to secure the orientation of the second stem in the second stem receiving channel wherein the first and second stem (305, 310), first and second securing pin (335, 340) and coupler comprise the coupling assembly; wherein the coupler is configured to couple the first stem and the second stem so as to isolate a torque load and a thrust load; and characterised in that: a coupler end of the first stem comprises a forked receiving portion configured to receive the first securing pin at a variety of positions along in the forked receiving portion.