{
  "schema": "piping-selected-valve-envelope-comparison/v1",
  "object_id": "c03-operating-envelopes",
  "scope": "Selected component motion and intervention geometry, not generic valve dimensions or force acceptance.",
  "constructions": [
    {
      "type": "Rising-stem gate with axially retained rotating yoke-sleeve operator",
      "open_geometry": "Stem projection; actual wheel position/diameter",
      "task": "Clear full travel and allow operation"
    },
    {
      "type": "Globe/angle with handwheel attached to stem",
      "open_geometry": "Translated wheel height plus swept diameter",
      "task": "Allow translation and rotation at operating position"
    },
    {
      "type": "Geared/powered operator",
      "open_geometry": "Actual gear/actuator shape and removal envelope",
      "task": "Do not infer envelope from equal face-to-face dimension"
    },
    {
      "type": "Check with removable cover",
      "intervention_geometry": "Cover opening and disc/closure withdrawal/handling",
      "task": "No operating stem does not remove maintenance space"
    }
  ],
  "exclusions": [
    "Actual manufacturer dimensions",
    "Operating torque/force or actuation time",
    "Full maintenance/isolation procedure",
    "Unqualified backseat/live-repacking permission"
  ],
  "project_acceptance": false
}