what is the difference between a check valve and a backflow preventor?
Back flow prevents can also be tested and certified. Back flow prevents are commonly used to prevent ground water from siphoning back in to your tap water system in the event of a loss in water pressure in your house.
In other words if your sprinkler heads were submersed in water outside above where your water enters the house and you experience a sudden pressure drop in your house water pressure the ground water can gravitate in to your system. Then you drink it.
BUT a back flow preventer is just a really expensive set of check valves invented by plumbers and lobbyist then required by code in a lot of areas to get you to spend money and recertify the thing every year for a fee.
a check valve is just a component of a back-flow preventer. A back-flow preventer is a device usually containing 2 check valves and possibly a relief valve venting to outside the system.
About a buck and a half.
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