Fire hydrant system valve selection needs to be combined with fluid control needs, sealing performance and fire code requirements, the following are recommended types and basis for different scenarios:
1. Core valve types and applicable scenes
Signal butterfly valve
Functional characteristics: rotate the butterfly plate by worm gear transmission device, support 0 ° to 90 ° opening and closing adjustment, with a microswitch real-time feedback valve switch status (fully open or fully closed) to the fire control centre.
Application Scenario: High-rise building fire protection system, pipeline network nodes that need to remotely monitor the status of the valve.
Advantages:
Small and lightweight, support any position installation, excellent sealing performance (gas test leakage is zero);
Worm gear self-locking design ensures that the valve stably maintains the set state after opening.
Butterfly valve
Functional characteristics: the valve body is made of cast iron or stainless steel, and the valve flap is equipped with rubber or metal seals, which is corrosion-resistant and has no leakage under the closed state.
Application Scenario: at the branch or the end of the fire fighting pipeline, used to quickly open and close the water flow.
Advantages:
Compact structure, open and close quickly (90 ° rotation can complete the operation);
Support the flow of fine adjustment, to adapt to the needs of complex fire-fighting scenarios.
Gate valve
Functional characteristics: through the vertical medium flow direction of the gate opening and closing to achieve cut-off, fluid resistance and opening and closing effort.
Application Scenario: Fire hydrant system and sprinkler system in the trunk pipeline.
Advantages:
No restriction on the direction of media flow, suitable for pipelines that may change the direction of flow;
open and close state of the open stem gate valve is intuitive, dark stem gate valve is suitable for hidden projects.
2. The selection basis and specification requirements
sealing performance: fire protection systems need to meet the requirements of zero leakage, signal butterfly valve and clamped butterfly valve rubber/metal sealing structure can protect the long-term reliability.
Convenience of operation: butterfly valve products (such as handle butterfly valve) operating torque is small, easy to open and close manually, and can be quickly responded to in case of emergency.
Pressure adaptability: the valve body material needs to match the pipeline pressure level, cast iron valve body is suitable for conventional pressure, stainless steel valve body is suitable for high pressure or corrosive media environment.
Normative constraints: Some fire fighting scenarios require butterfly valves to have self-locking function (such as anti-misoperation design) to ensure system safety.
3. Typical configuration example
High-rise building fire hydrant system
Main pipe: gate valve (open or concealed lever) for total flow control;
Branch pipeline: signal butterfly valve to achieve segment control and status feedback;
End hydrant interface: clamp butterfly valve to quickly cut off water flow. Butterfly valve for quick cut-off of water flow.
Underground fire fighting pipe network
Priority is given to corrosion-resistant stainless steel butterfly valves to avoid corrosion of the valve body caused by humid environment.