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Drafting, Conversion & MBD · Case study

DN250 Class 150 Bellow-Seal Globe Valve: 2D to 3D

A valve manufacturer had its DN250 Y-type bellow-seal globe valve defined only in 2D. We modelled the body, bonnet, plug and stem from the drawings — flanged ends with the correct drilling, cast body with machining allowances, bellow and packing areas — and delivered a mated assembly ready for drawings, catalogue views and CAM.

India SolidWorks
CAD model of a DN250 Y-type globe valve body with flanged ends
Client
Industrial valve manufacturer, Gujarat (name withheld under NDA)
Platform
SolidWorks
Client region
India
Valve
250 NB, Class 150, Y-type bellow-seal globe, flanged
Parts modelled
Body, bonnet, plug, stem
Flanges
16 × Ø17.5 on Ø415 PCD / 12 × Ø25.4 on Ø361.9 PCD per drawing

The challenge

Valve bodies are castings with a machined flow path, and the 2D drawings describe both the casting and the machining on one sheet. The model had to separate the two cleanly — as-cast geometry with allowances and the finished machined faces, flange drilling and seat — so that the maker could use it for pattern work, machining and catalogue illustrations.

Our approach

The body was modelled as a cast part with the Y-type flow path, then machined features added as separate features: the end flanges with their drilling patterns, the seat bore and the bonnet joint. Bonnet, plug and stem were modelled to their drawings with the bellow and packing areas as the drawing defined them, and the four parts mated into a valve assembly in the closed position.

Every dimension on the source drawings was ticked off against the model, and the few ambiguities — a wall thickness implied rather than dimensioned — were listed on a query sheet and confirmed with the maker before release.

Valve body model DN250 Class 150 Bellow-Seal Globe Valve: 2D to 3D — additional view

What was delivered

The maker received native SolidWorks parts and assembly, STEP files and a query sheet closed with their answers, and now produces catalogue sections and machining programmes from the model.

  • SolidWorks parts for body, bonnet, plug and stem
  • Mated valve assembly
  • STEP exports
  • Query sheet with resolved items

Standards and conventions applied

  • Flange dimensions as defined on the maker's drawings
  • ISO 2768 general tolerances
  • Casting and machining features separated in the model

Have a similar requirement? Send the drawings, a sketch or a description — an engineer will scope it and reply with an itemised quote within one business day. Request an engineering quote.

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