Circular ventilation butterfly valve

A circular ventilation butterfly valve is a quarter-turn rotary control valve designed specifically for regulating or isolating gas flow in industrial ventilation,dust removal,and flue gas systems.It features a circular disc(butterfly plate)rotating 90°around a central stem inside a round body,enabling precise airflow adjustment or shut-off with minimal pressure drop.

Structure&Working Principle

Core Components

Valve Body:Circular flanged housing,typically carbon steel or stainless steel,for duct mounting。

Butterfly Disc:Round plate that rotates to control flow;optimized for low flow resistance。

Valve Stem:Connects the disc to the actuator,transmitting torque for rotation。

Sealing System:Wear-resistant seals(asbestos rope,flexible graphite)for low leakage。

Working Principle

The disc rotates 90°via the stem:fully parallel to the pipe for maximum flow,perpendicular for tight shut-off,and at intermediate angles for precise flow regulation.

Key Features

Compact&Lightweight:Simple structure,easy installation and maintenance。

Low Torque Operation:Requires minimal force for opening/closing,suitable for large sizes。

Wide Size Range:DN100–DN6000,adaptable to various duct diameters。

Temperature Resistance:Suitable for media≤300°C,ideal for hot flue gas and dust-laden air。

Multiple Actuation:Manual(lever/gear),electric,or pneumatic options for flexible control。

Low Leakage:Standard leakage≤3%,low-leakage type≤1%。

Applications

Widely used in industries such as power generation,metallurgy,cement,chemical,and HVAC for:

Ventilation and dust removal systems。

Flue gas and air flow regulation in ducts。

Fan inlet/outlet control and system isolation。