Machino Type Fire Hydrant With Fire Hose Coupling And Nozzle
Fire Hydrant
China Deyuan Marine Fitting Co., ltd are leading supplier of marine fire hydrant, fire hose, hose couplings, adaptor, spray/jet nozzle.
We have 90° Flanged Fire Hydrant, 180° Flanged Fire Hydrant, 45° Flanged Fire Hydrant, 90° Pin Fire Hydrant, Marine Flanged Fire Hydrants, 45° , 90° Pin Fire Hydrant, Machino Fire Hydrant etc. Pls contact us for more specific details.
A user should take care not to open or close a fire hydrant too quickly, as this can cause a water hammer, which can damage nearby pipes and equipment. The water inside a charged hose line causes it to be very heavy and high water pressure causes it to be stiff and unable to make a tight turn while pressurized. When a fire hydrant is unobstructed, this is not a problem, as there is enough room to adequately position the hose.
Most fire hydrant valves are not designed to throttle the water flow; they are designed to be operated full-on or full-off. The valving arrangement of most dry-barrel hydrants is for the drain valve to be open at anything other than full operation. Usage at partial-opening can consequently result in considerable flow directly into the soil surrounding the hydrant, which, over time, can cause severe scouring. Gate or butterfly valves can be installed directly onto the hydrant orifices to control individual outputs and allow for changing equipment connections without turning off the flow to other orifices. These valves can be up to 12 inches in diameter to accommodate the large central "steamer" orifices on many US hydrants. It is good practice to install valves on all orifices before using a hydrant as the protective caps are unreliable and can cause major injury if they fail.
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