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Tee inserts, 2 in: volume fillers for the run and branch of a standard 2 in equal tee
How do I cut the dead volume of a standard tri-clamp tee in a Stirling engine? · Hardware · basis: ASME BPE 2 in bore Ø47.5, Type B lip 1.95 past each face, standard 2 in equal tee (7MP) run 177.8 and branch 88.9 centre to face; passages and spigot are design values
Long Earth Society build part. What fills the standard tee on my Ringbom and gamma. The engines
Exact dimensions. Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part. Mating features
- sizes
- 3 in table
Notes
- A standard 2 in equal tee has 177.8 mm of run and 88.9 mm of branch: about 400 mL of gas that would do no work in a Stirling engine. Two inserts fill it. The run insert is a Ø47.5 cylinder 173.9 mm long that sits between the two Type B gasket lips; the branch insert slides into the branch and its saddle end sits on the run insert.
- The gas goes up an Ø7 riser in the run insert to the branch axis, then out along the branch insert's Ø8 passage to the rolling diaphragm. The branch insert's Ø10 spigot sits in a counterbore at the end of the run insert's passage, so the passages line up and the run insert cannot turn.
- The displacer rod runs up the axis of the run insert in its own rod way: Ø9 for the Ringbom's Ø8 rod, Ø4 for the gamma's Ø3 rod. The Ringbom insert has a short Ø18 cavity at the bottom for the displacer cap's boss at the top of its travel.
- On top the run insert has a Ø45.3 spigot that passes through the upper gasket's lip and stops 0.5 mm under the gland cap's recess floor, so the top joint holds almost no gas; the cap's M5 port reaches the working gas through that gap and the rod way.
- The branch insert ends 0.5 mm short of the branch face, under the diaphragm's flange.
Sizes
| part | od_mm | length_mm | rod_way_mm |
|---|---|---|---|
| rd-tee-insert-2in-ringbom | 47.5 | 173.9 | 9.0 |
| rd-tee-insert-2in-gamma | 47.5 | 173.9 | 4 |
| rd-branch-insert-2in | 47.5 | saddle to 88.4 |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance; leave designed gaps and clamp fits as drawn.
| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| run insert OD | Ø47.5 | bore of the 2 in tee's run | slide | rd-tee-insert-* |
| run insert length | 173.9 between the Type B lips | lower lip (it stands on it) | designed | rd-tee-insert-* |
| top spigot | Ø45.3 | upper Type B gasket lip; 0.5 under the gland cap's recess floor | slide | rd-tee-insert-* |
| spigot counterbore | Ø10 × 4 | branch insert spigot | slide | rd-tee-insert-* |
| rod way | Ø9 (Ringbom) / Ø4 (gamma) | Ø8 / Ø3 rod (no contact) | designed | rd-tee-insert-* |
| branch insert OD | Ø47.5 | bore of the tee's branch | slide | rd-branch-insert-* |
| saddle | R23.75 about the run axis | run insert OD | slide | rd-branch-insert-* |
| spigot | Ø10 × 4 | run insert counterbore | slide | rd-branch-insert-* |
| end to the branch face plane | 0.5 | diaphragm flange (no contact) | designed | rd-branch-insert-* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| ISO (via iTeh sample) | ISO 2852 clamp liners: face profile and flange / groove diameters | standard excerpt; dimensions are facts | |
| ASME | BPE Bioprocessing Equipment (clamp fitting dimensions, tube OD and wall) | standard | ASME; dimensions are facts verify |
| Long Earth Society | Engine builds | web, video | LES site |
Free files
★ Free files 3 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| rd-tee-insert-2in-ringbom | run insert Ø47.5 × 173.90 (between the two Type B lips of a 2 in equal tee): Ø18 × 6.85 axis cavity, Ø7 riser at x 17 to the branch axis (86.95 up) and out along +X, Ø10 × 4 counterbore for the branch insert's spigot, Ø45.3 spigot on top through the upper gasket's lip to 0.5 under the gland cap's recess floor, Ø9 rod way on the axis | STEP · STL |
| rd-tee-insert-2in-gamma | run insert Ø47.5 × 173.90: as the Ringbom insert with no axis cavity and an Ø4 rod way | STEP · STL |
| rd-branch-insert-2in | branch insert Ø47.5: saddle on the run bore to 88.4 from the run axis (0.5 short of the branch face plane), Ø10 × 4 spigot into the run insert, Ø8 passage on its axis | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=tri-clamp-rd-tee-inserts
How it fits
In these build lists
Tri-clamp rolling-diaphragm Ringbom, 2 inThe simplest mechanism I could draw: one crank, one con-rod, and a free displace…Tri-clamp rolling-diaphragm gamma, 2 inThe Ringbom's cup, tee and power head with the displacer on the crank: a pushrod…You might also need
Questions
Why not a custom compact tee?
A standard tee is the cheapest fitting there is and takes a stock clamp and gasket on every end; the inserts take its volume away.
How are they held?
The run insert stands on the lower gasket lip and its top spigot passes the upper one; the branch insert is held between the run insert and the diaphragm's flange, 0.5 mm clear of it.