The butterfly valve for fire water supply is a valve device designed for fire protection system. It controls the water flow interruption and adjusts the flow rate through the rotation of the butterfly plate, and has both safety and functionality. Its core characteristics and technical points are as follows:
1. Definition and structural characteristics
Conceptual definition
The butterfly valve for fire water supply belongs to a regulating valve. The opening and closing of the pipeline water flow and the flow control are realized by rotating the disc-shaped butterfly plate around the valve axis (0°-90°). In the fire protection system, it mainly undertakes the functions of segmented isolation of the pipeline network, water flow blocking and pressure regulation.
Core components
Valve body: mostly made of ductile iron, carbon steel or stainless steel, adapted to the pressure resistance and corrosion resistance requirements of fire water supply pipelines; Butterfly plate: disc-shaped metal or composite material structure, connected to the actuator through the valve shaft; Seal: elastic sealing ring (such as nitrile rubber) or metal multi-layer sealing structure to ensure zero leakage in the closed state; Transmission components: worm gear transmission device (signal butterfly valve) or manual/electric actuator to achieve precise control.
2. Functional features and technical requirements
Key functions
Quickly cut off water flow: Rotate 90° to fully open/close, with a response speed of seconds, meeting the needs of emergency fire conditions; Flow regulation: The butterfly plate angle is adjustable, supports linear pressure control, and adapts to the needs of segmented pressure reduction in the pipeline network; State feedback: The signal butterfly valve with a built-in micro switch can transmit the valve opening and closing status to the fire control center in real time.
Technical specifications
Sealing performance: The leakage when closed meets the GB/T 13927 standard (elastic seal zero leakage, metal seal ≤0.1% KV value); Pressure resistance: The nominal pressure range is PN10-PN40, matching the water outlet pressure of the fire pump (conventional system requirements ≥1.6MPa); Corrosion resistance: The stainless steel valve body must meet ISO 9227 NSS 500 hours of rust-free in the salt spray test.
3. Typical application scenarios
Main pipeline network isolation
Install at the outlet pipe of the fire pump and the node of the zoned water supply main pipe, and realize the segmented maintenance of the pipeline network through the linkage of the gate valve.
Automatic sprinkler system
The signal butterfly valve works with the water flow indicator and the alarm valve to ensure that the water source of the sprinkler system is stable and the status can be monitored.
Special environment adaptation
Underground fire pipeline network: stainless steel wafer butterfly valve is preferred to resist groundwater corrosion; High-rise building: worm gear self-locking butterfly valve is configured to prevent water hammer impact from causing valve malfunction.