A system includes an actuator housing having a plurality of adapter lugs extending radially inward toward an axis, each adapter lug of the plurality of adapter lugs secured to the housing via a respective connector. The system also includes a bonnet having a plurality of bonnet lugs extending radially outward away from the axis, each bonnet lug of the plurality of bonnet lugs being separated by a respective space, the space being sized to permit axial movement of an adapter lug of the plurality of adapter lugs toward a lower flange arranged axially lower than the plurality of bonnet lugs.

A system includes an actuator housing having a plurality of adapter lugs extending radially inward toward an axis, each adapter lug of the plurality of adapter lugs secured to the housing via a respective connector. The system also includes a bonnet having a plurality of bonnet lugs extending radially outward away from the axis, each bonnet lug of the plurality of bonnet lugs being separated by a respective space, the space being sized to permit axial movement of an adapter lug of the plurality of adapter lugs toward a lower flange arranged axially lower than the plurality of bonnet lugs.

A smart valve positioner is provided with a local user interface with but-tons and a display inside a positioner housing under a housing cover for locally operating the valve positioner. The valve positioner is further provided with a detector detecting whether the housing or the housing cover is open or closed. The operation mode of the local user interface is configured to be different depending on whether the housing or housing cover is open or closed. For example, a larger variety of operations may be available when the housing or housing cover is open.

A smart valve positioner is provided with a local user interface with but-tons and a display inside a positioner housing under a housing cover for locally operating the valve positioner. The valve positioner is further provided with a detector detecting whether the housing or the housing cover is open or closed. The operation mode of the local user interface is configured to be different depending on whether the housing or housing cover is open or closed. For example, a larger variety of operations may be available when the housing or housing cover is open.