There are different types of Fire Hydrant Valve like Double Headed Hydrant Valve, Screw Type Hydrant Valve and Single Headed Hydrant Valves.
In Fire Hydrant System main keypart is Fire Hydrant Valves.
Hose Reel are installed in Hose Box and that Hose Reel is directly connected to Fire Hydrants.
When something happen and someone open Fire Hydrant Valve, water comes out with fully force.
Sometimes in big industrial setup, permanent Fire Stand Post also used to fight against fire.
There are main two types of metal in which Fire Hydrant Valves available is bronze and brase.