A Check valve acts as a one-way valve, allowing water to move in one direction only and prevents back siphoning of non-potable water into the water lines.
This 20 PSI pre-set regulator is made to go on a 1/2" sprinkler riser. Has built in check valve, so will not create run off. Valve opens at 25 PSI on start up and shuts off at 10 PSI on shut down.
No change in threads as it screws on the 1/2" male threads and ends in 1/2" male threads.
This comes in play if you have a very large single zone and you need to keep the pressure high within all the PVC piping but bring it down before you get to your drip components connecting to the 1/2" riser.
1" Brass Check Valve, Lead Free
The one-way 1" FPT Brass type check valve Aqualine (CVI-100-LF) is a one way valve used to stop back-flow and siphoning in the installation of any type of irrigation system. The check valve allows the water to move in one direction and prevents back-flow when pressure in the irrigation system drops.