Valved

Valved is an adjective meaning equipped with valves, or governed by valves. A valve is a device that permits, restricts, or directs the flow of fluids or gases by opening, closing, or narrowing a passage.

In engineering, valved systems use valves to regulate flow, pressure, and timing. Internal combustion engines rely on intake and exhaust valves controlled by a camshaft and valve train. Fluid systems such as water, pneumatic, and hydraulic circuits use various valves—ball, gate, check, relief—to start, stop, or modulate flow and pressure. Valved designs are often contrasted with valveless configurations.

In music, valved brass instruments use valve mechanisms to alter tubing length and thus pitch, enabling chromatic playing. Modern piston valves, developed in the 19th century and refined by Louis Auguste Périnet, are standard on trumpets, euphoniums, and many tubas.

In medicine, valved devices include prosthetic heart valves and transcatheter valve implants used to replace diseased cardiac valves and regulate blood flow. Valved stents are among the implants designed to restore proper valve function in patients with valve disease.

Overall, the term valved denotes systems or devices that include valves to control the passage of fluids, gases, or signals, across a range of applications from mechanical engineering to musical instruments and medical devices.