Actuator adapter for bonnet nub stem design

An actuating apparatus for operating a valve assembly having a valve body, a valve member in the valve body, a valve stem attached to the valve member, and a profile on an end of the valve stem distal from the valve member, the apparatus comprising:

• an actuator body that selectively couples to the valve assembly;
• an actuator stem that has an end that extends into the actuator body;
• an adapter assembly in the actuator body having a threaded end that extends towards the actuator stem, and a profiled end distal from the threaded end that engages the profile on the valve stem and couples to the valve stem, so that selectively applying axial forces to the adapter assembly moves the valve stem and the valve member, wherein;
• the profile includes an annular groove and the profiled end of the adapter assembly moves radially inward to engage the profile;
• an actuator downstop having one end engaged with the actuator stem and an opposite end connected to the threaded end of the adapter assembly;
• an anti-rotation member on the threaded end of the adapter assembly accessible by a tool to prevent rotation of the adapter assembly when the actuator downstop is rotated;
• wherein the adapter assembly comprises an adapter shaft and a connector collar assembly that has a collar end surface facing away from the adapter shaft that lands on an end of the valve stem and provides an axial load transfer path between the adapter shaft and the valve assembly;
• a retainer that attaches the connector collar assembly to a connector housing located at the profiled end of the adapter assembly;
• and
• wherein the retainer comprises external threads on an outer diameter of the connector collar assembly that engage internal threads of an inner cavity of the connector housing.