three ways fire hydrant
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- Place of Origin: Fujian, China (Mainland)
- Brand Name: duntop
- Model Number:SSF/SS/SA/SN/SNW/SNZ/SNZW/SNSS/SNSSW/PS
- Material: Ductile Cast iron
- Norminal Working Pressure: 1.6Mpa
- Hydrant Type: Outdoor type, Indoor type
- Norminal Diameter: 100mm
- Open Height: More than 50mm
- Hydrant Installation: Underground, Landing
- Water Outlet Diameter: 65mm
- Keyword: fire hydrant types, fire hydrant with high quality
- Certificate: ISO9001:2008
- Working pressure: 300Bar
Fire hydrants in the cooler states have an added level of complexity because the temperature often goes below freezing in the winter. Since water expands when it freezes and turns to ice, the hydrant could crack if there is water in the hydrant when it freezes and expands. Also, if there was a fire during the freezing weather, the hydrants wouldn't work, because there would be a huge chuck of ice clogging the hydrant.
To avoid the problem of freezing water, many hydrants are 'dry barrel hydrants', which means that no water stays in the upper section of the hydrant when the hydrant valve is turned off. The valve that controls the water flow is below ground and there is a long rod that connects the stem nut to the valve. Next to the valve, there is a drain hole to let water drain out of the barrel of the hydrant after firefighters turn the valve off. The pipe that holds the water is buried deep enough so that it never freezes.
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Source: http://www.duntopgroup.com/three-ways-fire-hydrant.html