valveless
/ˈvælvləs/
adjective
- Having no valve or valves; lacking a device to control the flow of liquid, gas, or sound.
- The valveless design of the old engine made it simpler but less efficient.
- Some early brass instruments were valveless, so players could only produce a limited set of notes.
- A valveless pump relies on the movement of the fluid itself to prevent backflow.
Antonyms