qualifier number + unit a measured amount

valve opening pressure

The differential pressure at which an integral valve opens — WIX publishes a Bypass Valve Opening Pressure of 0.551 bar for the 51521. A qualifier of `integral_valve` and not a flat property beside it: a filter may carry two valves, and a loose pressure could not say which one it belongs to.

Valve opening pressure is a measured figure, given in bar.

It is a qualifier of integral valve — it has meaning only inside a integral valve statement, one per statement, never on its own. It belongs with integral valve to measurement — its measurable, physical facts.

It is answered inside every integral valve statement, not as a standalone question on a kind.

answered with: №number + unit — a number paired with a unit drawn from an exhaustive unit vocabulary.
value domain: Pressure units — the vocabulary its answers are drawn from.
qualifier of: integral valve — one per statement — it has meaning only inside that host's statement.

Answered inside every integral valve statement — not a standalone slot on any kind.