Flowserve has enhanced the design of its size 2½ and larger Double Disc gate valves to isolate the actuator torque loads from the valve internals (disc pack) to improve its reliable operation and sealing capabilities.The redesign utilizes a slotted stem to transfer the actuation torques to the anti-rotation collar and valve yoke, thus eliminating the torsional loads on the valve disc pack and valve seating surfaces.The valve internals have also been redesigned to change the stem-to-upper wedge connection from threaded and pinned to a T-Head design. Disc retainers are now assembled to the upper wedge using fasteners. There is no wedge pin involved with this assembly.