Related Words

Atrioventricular (AV) Valve: The valve between each auricle and ventricle of the heart.

Semilunar Valve: A valve between each ventricle of the heart and the artery connected to that ventricle.

Safety Valve: A receiver whose job it is to get open for a short pass in case all other receivers are covered.

Sidevalve Engine (SV): Valves positioned in an engine beside a cylinder instead of in the cylinder head. The design was common in early engine designs, but has since fallen from use. Also known as an L-Head or Fla . . . View Full Definition

Relief Valve: A device designed to open if it detects excess temperature or pressure.

Valves (Intake and Exhaust): Poppet valves within a four-stroke cylinder head that open and close to allow fuel/air into the combustion chamber, and open and close to vent the burned gas. Four-valve cylinder heads can m . . . View Full Definition

Zone Valve: A device, usually placed near the heater or cooler, which controls the flow of water or steam to parts of the building: it is controlled by a zone thermostat.

Valvetrain: An all-encompassing term used to describe the mechanisms and parts which control the operation of the valves in an internal combustion engine.

Reed Valves: Reed valves are commonly used in high-performance versions of the two-stroke engine, where they control the fuel-air mixture admitted to the crankcase. As the piston rises in the cylinder th . . . View Full Definition

Stop Valve: A device installed in a water supply line, usually near a fixture, that permits an individual to shut off the water supply to one fixture without interrupting service to the rest of the system.