Definition

Noun: A butterfly valve is a type of flow control device. It consists of a flat, circular disc (the "butterfly") mounted on a rod. When the valve is open, the disc is turned parallel to the flow, allowing fluid or gas to pass. When closed, the disc is rotated to block the passage. It acts as a throttle to regulate the rate of flow.

Usage

A butterfly valve is used to start, stop, or regulate the flow of air, gas, or liquid in a pipe or duct. It is commonly found in engines, industrial piping systems, and HVAC (heating, ventilation, and air conditioning) systems. * The mechanic adjusted the butterfly valve in the carburetor to improve the engine's idle speed. * For precise control of air intake, the system uses a motorized butterfly valve.

Advanced Usage

• Throttle Body: In automotive engineering, the assembly containing the primary butterfly valve that controls air intake into an engine is called a throttle body.
• Damper: In HVAC systems, a butterfly valve used to control airflow within a duct is often referred to as a damper or louver.

Variants and Related Words

• Butterfly (noun): In this technical context, it refers specifically to the rotating disc component inside the valve.
• Throttle valve (noun): A general term for a valve that regulates flow; a butterfly valve is one common type of throttle valve.
• Rotary valve (noun): A broader category of valves that operate by rotating a component; a butterfly valve is a type of rotary valve.

Synonyms

• Throttle (noun/verb): When referring to its function of regulating flow.
• Damper (noun): Specifically when used for airflow control in ducts.
• Regulating valve (noun): A descriptive synonym emphasizing its control function.

Related Phrases

• To actuate a butterfly valve: To operate or move the valve into an open or closed position.
• Butterfly valve seat: The sealing surface inside the valve body against which the disc closes to stop the flow.

Noun

1. a valve in a carburetor that consists of a disc that turns and acts as a throttle