Square Ventilation Butterfly Valve

A square ventilation butterfly valve is a specialized quarter-turn control valve with a square duct design,specifically developed to regulate,isolate,and throttle airflow in square or rectangular ventilation ducts.Unlike round butterfly valves,its square structure perfectly matches standard square ducts,ensuring tight connection,uniform airflow distribution,and space-saving installation,making it an essential component in commercial,industrial,and civil ventilation systems where square ducts are widely adopted.

Constructed for durability and practicality,the valve consists of core components:a square valve body,butterfly disc,central stem,seal,and operating mechanism(manual,electric,or pneumatic).The square valve body is typically fabricated from carbon steel,stainless steel,or galvanized steel,with a rigid structure to withstand duct pressure and prevent deformation.Its inner wall is smooth,minimizing airflow resistance and avoiding turbulence,which helps reduce fan energy consumption.

The butterfly disc,a square or rectangular flat plate(matching the valve body shape),is mounted on a central stem and rotates 90 degrees to control airflow.When fully open,the disc is parallel to the airflow,allowing maximum ventilation with low pressure drop;when fully closed,it is perpendicular to the airflow,achieving low-leakage shutoff.The seal system—available in soft(EPDM,rubber)for general ventilation or metal-to-metal for high-temperature scenarios—ensures tight closure and prevents air leakage,maintaining system efficiency.

Key features of this valve include perfect compatibility with square ducts,compact design,and easy installation.It covers a wide size range,from 200×200mm to 2000×2000mm,adapting to different duct specifications in commercial buildings and industrial workshops.It offers bidirectional flow capability,allowing installation in any orientation without airflow direction restrictions,and has a temperature resistance range of-20°C to 300°C(high-temperature models up to 600°C for flue gas applications).

Widely applied in shopping malls,office buildings,hospitals,factories,and warehouse ventilation systems,the square ventilation butterfly valve is ideal for HVAC zone control,fresh air regulation,dust extraction,and exhaust control.Its simple structure,low maintenance requirements,and cost-effectiveness make it a practical choice for scenarios where square ducts are used,providing reliable airflow control and seamless integration with existing duct systems.