integral valve
Which valves are built into the filter itself — an anti-drainback flap, a bypass relief, both, or neither. Stated MANY times rather than as one combined word, because the trade publishes them as independent fields: WIX lists an anti-drainback valve and a bypass valve as two separate specifications on the 51521, and a filter that carries both is what the East African trade (and Habib's own sheet, on the Coaster/Land Cruiser 1HZ line) calls a double-valve filter. Enumerating the combinations instead would be a new value-set of an existing shape, and would double again the moment a third valve appeared. Each statement carries its own `valve_opening_pressure`. Askable only of a filter in a pressurised oil circuit: intake air and cabin air have no pressure to relieve and no standing column of oil to hold back.
Integral valve is answered with one word chosen from the integral valve types list — the same word shared across every product that uses it.
It belongs to measurement — its measurable, physical facts.
the bundle what travels with each integral valve
A integral valve is not a lone value — each statement is a self-correlating bundle, carrying its own:
asked by the kinds that answer it
1 kind answers it, each for any number of values. The same question can be reused by unrelated kinds — one meaning, many homes.
asked by kinds that answer it
The same question can be reused by unrelated kinds — one meaning, many homes.
| kind | how many |
|---|---|
| oil filter | many |