{
  "schema_version": "1.0",
  "rubrics": [
    {
      "id": "R1",
      "requirement": "The model shall include an INLET_HOUSING part with a Ø152.4 end flange carrying four Ø19.1 holes."
    },
    {
      "id": "R2",
      "requirement": "The INLET_HOUSING shall have a Ø50.8 through bore along the flow axis."
    },
    {
      "id": "R3",
      "requirement": "The INLET_HOUSING shall have a Ø127 mating flange with four Ø12.7 holes at the opposite end from the Ø152.4 flange."
    },
    {
      "id": "R4",
      "requirement": "The INLET_HOUSING shall have flanges 16.5 thick and a 102.9 dimension between its flange faces."
    },
    {
      "id": "R5",
      "requirement": "The INLET_HOUSING shall carry a 9.7 thick top mounting pad with a central Ø25.4 hole."
    },
    {
      "id": "R6",
      "requirement": "The BALL_VALVE_SUB part shall have a Ø52.8 spherical ball with a Ø38.1 through bore."
    },
    {
      "id": "R7",
      "requirement": "The BALL_VALVE_SUB ball shall be trimmed to parallel flats 34.92 apart."
    },
    {
      "id": "R8",
      "requirement": "The BALL_VALVE_SUB shall have a Ø25.4 stem 61.56 long ending in a 20.9 × 20.9 square tang 31 long."
    },
    {
      "id": "R9",
      "requirement": "The BALL_VALVE_SUB shall measure 115.7 from the ball centre to the top of the stem."
    },
    {
      "id": "R10",
      "requirement": "The CAP_SCREW part shall be 41.4 long overall with a Ø9.7 shank and a Ø17.3 collar 2.3 thick."
    },
    {
      "id": "R11",
      "requirement": "The CAP_SCREW shall have a Ø11.7 head with a hexagonal socket 6.06 across."
    },
    {
      "id": "R12",
      "requirement": "The CAP_SCREW shall have a 1 × 45° chamfer on the head and a 1.16 × 45° chamfer on the shank end."
    },
    {
      "id": "R13",
      "requirement": "The HEXAGONAL_BOLT part shall be 40.89 long overall with a Ø12.70 shank and a Ø24.64 flange."
    },
    {
      "id": "R14",
      "requirement": "The model shall be built in millimetre units."
    },
    {
      "id": "R15",
      "requirement": "The model shall be organised as a product named water_control_valve_assembly referencing separate parts INLET_HOUSING, OUTLET_HOUSING, BALL_VALVE_SUB, CAP_SCREW, THERMOSTAT_FLANGE, LOCK_LEVER, HANDLE and HEXAGONAL_BOLT."
    },
    {
      "id": "R16",
      "requirement": "The product shall contain 12 component instances: 4 CAP_SCREW, 2 HEXAGONAL_BOLT and one each of the other six parts."
    },
    {
      "id": "R17",
      "requirement": "The assembly shall position the inlet and outlet housings coaxially along the flow axis."
    },
    {
      "id": "R18",
      "requirement": "The assembly shall position the ball valve stem vertically, with the handle fitted on its square tang."
    }
  ]
}