Waterschap Brabantse Delta · R&D lab · supplier portal
Submit your control-valve dataset
We evaluate control valves by recomputing performance at our own site conditions — so we need your coefficients, not only an example sheet. Fill in the form (paste columns straight from Excel; decimal commas are fine), watch your own curves appear, and submit when the checks are green. Background and definitions: the data-requirements page.
Prefer to send this as data instead? (API / batch)
Everything this form builds is one JSON object — shown live below, it follows along with
what you type in the form. Send it (or many of them) to POST https://wbd-rd.nl/api/valve-submissions with a Bearer token; ask your
contact at the R&D lab for one. The API runs exactly the same verification as this form.
curl -X POST https://wbd-rd.nl/api/valve-submissions \ -H "Authorization: Bearer <your token>" \ -H "Content-Type: application/json" \ --data-binary @your-valve.json
{
"schema": "valve-submission/v1",
"medium_class": "gas",
"supplier": {
"company": "",
"contact": "",
"date": "2026-08-27"
},
"valve": {
"model": "",
"type": "",
"dn_mm": null,
"face_to_face_mm": null
},
"coefficients": {
"stroke_pct": [],
"zeta": [],
"kv_m3h": [],
"tolerance_pct": null
},
"conventions": {
"zeta_reference_area": "nominal bore",
"sizing_formula": "",
"humidity_basis": "dry"
},
"worked_example": {
"medium": "air",
"flow_unit": "kg/h",
"p_upstream_bar_abs": null,
"T_C": null,
"dp_mbar": [
2,
4,
6,
8,
10,
12,
14,
16,
18,
20
],
"flows": {}
},
"tier2": {}
}1 Medium
ζ itself is medium-independent; this choice decides which conventions are mandatory.
2 Who and what
3 Coefficients per stroke
ζ (resistance coefficient) and Kv (m³/h) at ≥ 10 stroke points — the redundancy is deliberate: we cross-check ζ = 1.6·10⁹·D⁴/Kv². Click a cell and type, or click the table and paste 2–3 columns straight from Excel (stroke · ζ · Kv, or just ζ · Kv for 10…100 %).
| stroke / % | ζ [–] | Kv [m³/h] |
|---|---|---|
4 Conventions
One line each — leaving these unstated changes results by 1–7 %, more than the difference between competing valves.You chose kg/h, so no norm-volume basis is needed — two fewer questions.
5 Worked example (the checksum)
With your ζ and Kv we can compute any flow table ourselves — so this step is not information, it is proof: numbers you committed to, that our reconstruction must reproduce. A full table is the strongest proof if you have one; otherwise three spot-check points are enough (two Δp at one stroke prove the √Δp behaviour, one at another stroke proves the scale).
Process reference point
The site conditions your numbers refer to. These are physics, not reporting convention — mass flow through the valve depends on gas density, so they stay required with kg/h too.
Pressure-loss columns (mbar) — click and paste a row from Excel if you like:
Flows in kg/h — one row per stroke point of step 3, one column per Δp above. Click the table and paste the whole block from Excel in one go.
| stroke | 2 mbar | 4 mbar | 6 mbar | 8 mbar | 10 mbar | 12 mbar | 14 mbar | 16 mbar | 18 mbar | 20 mbar |
|---|---|---|---|---|---|---|---|---|---|---|
| 10 % | ||||||||||
| 20 % | ||||||||||
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| 90 % | ||||||||||
| 100 % |
6 Self-check and submit
These four checks run live while you type, and run again — with the same code — when we receive your dataset. Red items become a clarification round, so fixing them now saves a mail exchange.
- Company name — step 2
- DN (mm) — step 2
- The ζ and Kv table — step 3
- Tolerance on ζ/Kv — step 3
- Upstream pressure — step 5
- Temperature — step 5
- The sizing formula, named — step 4
- The flow table or the 3 spot-check points — step 5