Square Ventilation Butterfly Valve

Square Ventilation Butterfly Valve is a specially designed quarter-turn rotary valve with square duct body,widely applied to low-pressure air flow regulation,open/close control of square and rectangular ventilation pipelines.It is mainly used for clean air,dust gas,flue gas and waste gas ventilation systems,featuring simple structure,convenient manual operation and stable airflow adjustment performance.

Product Structure

Square Valve Body

Adopts integral square shell structure,mainly made of Q235 carbon steel,stainless steel 304/316.The overall welding structure is firm,perfectly matching square air ducts on site.

Butterfly Disc

Square-shaped disc connected with valve stem,rotating within 90 degrees.Smooth surface design reduces air flow resistance effectively.

Valve Stem

High-strength solid transmission shaft,with anti-wear and corrosion-resistant performance,ensuring long-time stable rotation.

Sealing Parts

Equipped with soft sealing(silicone,EPDM)and hard metal sealing options.Soft seal achieves good airtight effect,while metal seal adapts to high-temperature working conditions.

Manual Actuation Device

Includes manual handle,worm gear and handwheel.Small-size valves adopt direct handle operation;large-size square valves are equipped with worm gear structure for labor-saving adjustment.

Working Principle

Driven by manual operating mechanism,the valve stem drives the square disc to rotate inside the valve body.

When the disc is parallel to the airflow direction(0°),the valve is fully open with maximum air passage.

When the disc is vertical to the airflow(90°),the valve is fully closed to cut off gas circulation.

Adjusting the rotation angle of the disc freely realizes accurate adjustment of airflow volume.

Main Features

Special square body shape,perfectly suitable for square and rectangular ventilation ducts.

Light overall weight,compact structure and easy on-site installation.

90°quick opening and closing,simple and reliable manual operation.

Low airflow resistance,small pressure loss during medium circulation.

Wide applicable temperature range,supports normal temperature and high-temperature working conditions.

Excellent dust resistance,suitable for dusty industrial exhaust pipelines.

Less vulnerable parts,simple daily maintenance and long service life.

Customizable size,can be produced according to customer’s duct dimension requirements.

Technical Parameters

Body Size:Custom square specifications

Working Pressure:PN0.1~PN0.6 MPa low pressure

Working Temperature:-20℃~425℃

Body Material:Carbon steel Q235,304 stainless steel,316 stainless steel

Seal Material:Silicone,EPDM,metal hard seal

Operation Mode:Manual handle,worm gear,handwheel

Connection Mode:Flange connection,welding connection,duct direct connection

Applicable Medium:Air,dust gas,flue gas,industrial waste gas

Applications

Industrial environmental protection dust removal systems

Boiler flue gas exhaust and ventilation pipelines

Metallurgical,cement and building material industrial exhaust systems

HVAC ventilation engineering and workshop air exchange systems

Waste gas treatment and purification duct systems

Various square pipeline ventilation and flow control occasions

Product Advantages

Perfect matching for square air ducts,no additional transition joints needed.

Cost-effective structure with low manufacturing and maintenance cost.

Stable operation without jamming under dusty working environment.

Flexible angle adjustment,satisfying diversified air volume control demands.

Firm welded structure,strong wind pressure resistance and durable use.