physics.fluid.valve_cv

Three distinct suites: educational examples on the calculator page, this legacy regression count (17/17 golden + boundary), and the CVP verification suite below. They are not the same number. Property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the CVP Manifest . SKIP (0/0) means that suite has no published vectors.

This calculator CURRENT · Public schema 1.0.0 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓

CVP verification suite

Protocol checks from the Evidence Manifest. Distinct from the legacy regression suite above. Verification revision 2026-09-25.o2-o3. Calculation version 1.0.0. CVP 1.0.0-proposed. 4/4 golden · 9/9 CVP boundary · 9/9 invalid · 1/1 property · 1/1 metamorphic · 8/8 O3 · 2/2 cross-interface · 5/5 CVP contract. digest e7be7b65192a. O2: valve Kv/Cv vs a separate-module identity (≤2 ULP). Not a venturi wrap, not an orifice, and not Q=Av. ≤2 ULP vs O3 applies only to the published tabulated venturi vectors. Not Q=Av, not Manning, and not Darcy.

• Golden (oracle-backed) 4 / 4
• CVP boundary 9 / 9
• Invalid input 9 / 9
• Property 1 / 1
• Metamorphic 1 / 1
• O3 high-precision 8 / 8
• Cross-interface 2 / 2
• CVP contract 5 / 5
• Interfaces PASS · UI (SSR) / REST / MCP
• Interface claim ui-ssr is query-result HTML, not a live browser session. Error-path engine·REST·MCP 1/1 (status, code, calculation_version). SSR compared on URL-canonical requested calculations; empty query is idle (not an error) and JSON-typed object/array inputs are REST/MCP-only.
• Verified scope Q_m³/h = Kv √(Δp_bar/SG), Kv = 0.865 Cv, plus pressure, Kv, and Cv solves, + O3 mpmath tabulated flow.
• Assurance Engineering
• Deferred Not a venturi wrap, not an orifice, and not Q=Av.

• release artifacts aligned PASS
• schema output required declared PASS
• schema valid input executes PASS
• engine success output validates schema PASS
• rest success payload validates schema PASS

Fingerprint sha256:d4789ab3e4028776421f6e45c57d69b7d91e268116dfb37f88d6b000b21bcec7

Input schema sha256:d38cd4dee167c35753ba3e0e80283228a6156ce20f1427cfb683c53a4380dcf4 · Output schema sha256:c10b35f24095413db98c2410feefd666b46121f52b69ec7e99fa3ae235b5a7f2 · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Tool

valve-flow-coefficient

Engine

valve-flow-coefficient

Engine build

2026-09-17

Evidence core

2026-09-17T05:39:40.082Z

Rendered

2026-11-10T05:18:41.933Z

Last reviewed

—

Assumptions

• Incompressible liquid; Q_m³/h = Kv √(Δp_bar/SG); default SG=1
• Kv = 0.865 Cv (IEC 60534-1); frozen, not a US-gpm engine
• Not gas, not choked, not IEC 60534-2-1 xT/Y
• Not a venturi, not an orifice, not Q=Av, not Darcy, not minor-loss K

Limitations

• Incompressible liquid valve: Q_m³/h = Kv √(Δp_bar/SG); Kv = 0.865 Cv (IEC 60534-1)
• SI Q in m³/s, Δp in Pa; default SG=1 (water); not gas, not choked
• Not a venturi, not an orifice, not Q=Av, not Darcy, not minor-loss K