Introduction to Fire Protection Flange Butterfly Valves
Fire protection flange butterfly valves are crucial components in fire protection systems. They belong to the category of butterfly valves and are connected to pipelines through flanges. The following is a detailed introduction:
Structural Composition
A fire protection flange butterfly valve mainly consists of a valve body, a butterfly plate, a valve stem, a valve seat, a sealing structure, and a driving device (such as a manual worm gear, electric or pneumatic device). The valve seat is often made of synthetic rubber, or a composite valve seat composed of polytetrafluoroethylene and synthetic rubber. The butterfly plate is generally a circular metal plate, and some are fully coated with polytetrafluoroethylene to enhance corrosion resistance.
Working Principle
The valve operates by rotating the valve stem to drive the butterfly plate. When the butterfly plate rotates to 0°, the valve closes; when it rotates to 90°, the valve fully opens. The flow rate of the medium can also be adjusted by changing the angle of the butterfly plate. When closing, the outer circular sealing surface of the butterfly plate presses against the valve seat, causing the valve seat to elastically deform and form a sealing pressure, thus achieving sealing.
Classification
According to the driving method, they can be classified into manual, electric, and electromagnetic types. The manual type is controlled by a manual operating device, which is common and suitable for simple fire protection systems. The electric type is driven by an electric actuator, which is easy to operate and suitable for complex fire protection systems. The electromagnetic type relies on electric power to open and close the valve, and is suitable for fire protection systems with high power requirements.
Features
- Easy Installation and Maintenance: They are compact, lightweight, and easy to disassemble, assemble, and repair. They can be installed in any position.
- Simple Operation: With a simple and compact structure, they have a small operating torque. A 90 - degree rotation can quickly open or close the valve.
- Good Control Performance: Their flow characteristics tend to be linear, with good adjustment performance, enabling effective control of the water flow direction and rate.
- Reliable Sealing: The sealing parts can be replaced, achieving bidirectional sealing. Some products can still maintain zero - leakage after more than 50,000 times of opening and closing under pressure.
- Long Service Life: Designs such as the spherical shape of the outer circle of the butterfly plate improve the sealing performance and the service life of the valve.
Application Scenarios
Fire protection flange butterfly valves are widely used in various fire protection water supply and drainage pipelines, such as the fire protection systems of high - rise buildings and automatic sprinkler systems. In the event of a fire, they can quickly cut off or adjust the water flow, effectively preventing the spread of the fire. They also assist firefighters in evacuating people and materials. In daily use, they can be used in pipeline systems to display the opening and closing status of valves, facilitating monitoring and management.
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