Valve and meter

The words mean what they mean in English - Engineering has not changed their context.

Meter measures something.

Valve opens or closes to let something through or to stop something going through or to control flow or pressure or something.......................

"The words mean what they mean in English..." But in British English, "valve" can mean a radio / television tube; it controls the flow of electrons, true enough, but this is drastically different from American English usage! I cannot comment upon what meaning might occur in any other variant of the language.

"Meter" as a verb may also mean to control flow of some product. "A meter" (noun) is a measuring device, but if you see reference to, say, "metered [electrical] current", it is possible that the author means that the current is being measured, say, to assess cost to the consumer, OR could mean that the current is being limited (a "metered amount" is being permitted to pass a control point). In a chemical plant, one constituent may be put into the process stream based upon the amount of other materials going by; it would be perfectly ordinary usage to describe this as a metered amount, even if a valve (controllable constriction) is doing the metering! (well, at least in American English!)

Are there any valves (radios) in use now? (Except in museums)

You forgot mention one more meaning of meter (which is spelt as metre in british english!)

I cannot comment upon what meaning might occur in any other variant of the language.

It would be great to know more meanings of valve in all other languages you know.

I rest my case. The words mean what they mean in English. All you seem to be saying is that they may have more than one meaning, which is not uncommon in the English language. The point, very simply, is that "engineering" does not change the English meaning of the word.

Yet a number of uses of these terms occur ONLY in engineering /science/technology arenas. In effect, those definitions of the word are functionally restricted to those same territories because no one outside them ever uses the terms in the same manner, and they are thus undefined in ordinary English. Valve, as a verb, gets used in lighter-than-air flight, and in submarining: where else? Given sufficient context, a non-technical person might comprehend the use, but would never use the word in this fashion otherwise. Likewise, "to meter" is virtually unknown EXCEPT in technical context, and doesn't exist in ordinary speech.

It is easy to argue that technical English is a sub-set within English - but without a technical dictionary the OP isn't likely to find a useful distinction. Seems to me that that pretty well sums up the reason to post!

I tend to agree with your definitions of meter as measuring and valves controlling flow,pressure or opening/closing paths in a circuit.

There are however; metering valves so there is a certain amount of ambiguity. The words like any must be read in context to what is being said.