valved

1. 1
   adjective

   Having a valve or valves.

   The painter's dust mask is valved, so each breath out escapes easily.

   A valved bugle can reach notes that a plain bugle cannot.

   Oppositevalveless

   Note

   Formed from the noun valve plus -ed, on the pattern of winged or bearded, it says what a thing is fitted with rather than what someone did to it. That sets it apart from the past tense of the verb, which means controlled by a valve. It does not compare: a mask is valved or it is not.

2. 2
   verb

   Simple past and past participle of valve.

   The technician valved the flow of coolant into the test chamber.

   Steam from the boiler had been valved down to keep the pressure steady.

   Note

   The verb is regular and transitive, and what gets valved is the flow itself rather than the pipe: a technician valved the coolant into the chamber. After have or be it serves as the participle, often with a direction word, as in steam had been valved down to steady the pressure.

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