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Reduced pressure zone device connected to a fire hydrant. A reduced pressure zone device (RPZD, RPZ, or RPZ valve) is a type of backflow prevention device used to protect water supplies from contamination.
Fire hydrant in Charlottesville, Virginia, United States. A fire hydrant, fireplug, firecock (archaic), [1] hydrant riser or Johnny Pump [2] is a connection point by which firefighters can tap into a water supply. It is a component of active fire protection. Underground fire hydrants have been used in Europe and Asia since at least the 18th ...
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Water pressure may fail or be reduced when a water main bursts, pipes freeze, or there is unexpectedly high demand on the water system (for example, when several fire hydrants are opened). Reduced pressure in the pipe may allow contaminated water from the soil , from storage, or from other sources to be drawn up into the system.
It is commonly used on lawn irrigation, fire sprinkler [2] and combi-boiler systems. [3] If the hazard is higher, even a relatively low hazard such as using antifreeze in the fire sprinkler system, then a more reliable check valve such as a reduced pressure zone device may be mandated.
An American Linen & Uniform Supply trailer fell into a sinkhole that was created by a failed fire hydrant in downtown Las Cruces that caused flooding along Main Street Friday morning.
A recent introduction to the UK has been the Reduced Pressure Zone (RPZ) valve, a form of double check valve where the intervening zone is drained and normally kept empty. [1] If the downstream valve leaks and permits backflow, this will drain out through the vent rather than building up pressure against the upstream valve.
A former director at a Massachusetts migrant shelter is speaking out against what he says were incidents of widespread violence, child sexual assault and rape at shelters in the state, including ...
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