The seismically qualified actuator design is based on the standard Fisher 1052 size 60 actuator. The 1052PSV size 60 actuator incorporates the tilting diaphragm rod, turnbuckle adjusting feature, upper diaphragm casing assembly, and SS129 dual springs mounted within a fabricated box construction. The actuator box is designed for standard 3610J positioner mounting. Adjustable valve open position is  provided by limiting lever rotation with adjustable travel limit bolts in the bottom of the fabricated actuator box.