A powered actuating assembly configured for mounting on a tubular valve body. The actuating assembly includes: (a) an actuator unit configured to impart torque to the valve stem; (b) an actuator mounting plate with a first surface supporting the actuator unit and a second surface configured to engage and resist movement relative to the valve body; and (c) securing links configured to extend around a valve body surface opposite the mounting plate and secure the mounting plate to the valve body.