High Performance Ventilation Butterfly Valves

The High Performance ventilation butterfly Valves is specially designed for industrial ventilation and dust removal systems operating under low pressure and large diameter conditions. The valve body and main pressure-bearing components are manufactured from stainless steel materials such as SS304, SS316, SS304L, and SS316L, ensuring stable performance in corrosive gas, dust-laden air, and high-temperature flue gas environments.

This series adopts a concentric (centerline) butterfly valve structure with flanged connections and ventilation-duty sealing design (W type). It focuses on meeting the requirements of large flow capacity, low resistance, and reliable opening and closing in ventilation pipelines.

The two models share the same valve structure and sealing concept, with the main difference being the actuator type:

D641W: Pneumatic ventilation butterfly valve, operated by an air actuator

D941W: Electric ventilation butterfly valve, operated by an electric actuator

The Stainless steel ventilation butterfly valve is widely used in metallurgy, power generation, chemical processing, building materials, mining, and environmental protection projects.

Structure and Working Principle

Concentric Structure Design

The High Performance ventilation butterfly Valves adopts a concentric structure where the disc center coincides with the stem center. During operation, the disc rotates around the stem axis:

Simple structure with fewer components

Smooth flow path and low airflow resistance

Low operating torque, suitable for large-diameter ventilation systems

This structure offers good stability and cost efficiency for low-pressure, high-flow ventilation applications.

Flanged Connection

The valve body features integral flanges on both ends, allowing direct bolting to standard ventilation pipeline flanges:

Accurate installation positioning

Uniform stress distribution

Easy maintenance and replacement

Common flange standards include GB/T 9113 and ANSI B16.5.

Key Features

Full Stainless Steel Construction

Main components such as the body, disc, and stem are made of stainless steel, providing:

Excellent corrosion and oxidation resistance

Suitability for sulfur- and chlorine-containing gases

Structural stability under high-temperature ventilation conditions

Ventilation-Duty Sealing Design (W Type)

The valve is equipped with a sealing structure specifically designed for ventilation services:

Optional metal-to-metal sealing or composite sealing (FKM + stainless steel)

Balanced sealing reliability and wear resistance

Leakage rate compliant with JB/T 8692 ventilation butterfly valve standards

Large Diameter, Low Resistance Design

With nominal diameters ranging from DN100 to DN2000, the valve maintains:

Low pressure loss across the valve

Stable opening and closing performance

Suitability for systems with large airflow and low operating pressure

Automation-Friendly Actuation

Both pneumatic and electric actuation options support easy integration into automated control systems, making the High Performance ventilation butterfly Valves suitable for centralized and remote control applications.

Actuator Comparison

Technical Parameters

Material Specification

Applications

High-temperature flue gas ventilation in metallurgy

Boiler ventilation and desulfurization systems in power plants

Dust collection and exhaust systems in chemical and building materials industries

Mine ventilation and environmental protection projects

Industrial plants and large building air handling systems

In these applications, the Stainless steel ventilation butterfly valve is mainly used for airflow shut-off, flow regulation, and system flow direction control.

Selection Guidelines

Select suitable stainless steel grade according to gas corrosiveness

Match pressure and temperature ratings with system design conditions

Pay attention to body strength for large-diameter applications

Choose pneumatic or electric actuation based on site control requirements

Operation and Maintenance

Clean dust from sealing surfaces regularly to prevent buildup

Apply gradual heating during high-temperature startup

Ensure stable air supply pressure for pneumatic valves

Inspect actuator lubrication and electrical connections periodically

Product Summary

The Stainless Steel D641W / D941W Ventilation Butterfly Valve features a concentric structure, stainless steel construction, and ventilation-duty sealing design. With flexible pneumatic or electric actuation options, this Stainless steel ventilation butterfly valve provides reliable performance for industrial ventilation systems requiring stable operation and automation compatibility.