To minimize the pressure after plumbing repairs, (while the water is off) open up all your faucets for hot and cold water on each floor so that the water pressure is reduced departure? (After the water is re-kindle. I think I've found an answer. There is no reason to reduce the pressure "after" service. If the repair is successful pressure immediately include the repair. Guess even if you are wondering about reducing the pressure, "while" the repair is being done. Shut off the main water cut-off valve where the water enters your home. Then open a faucet anywhere low to relieve pressure in the lines. When water stops coming out are ready to perform a repair. Shut the spigot and jump to that needs to be repaired. If you're going to have to cut in line to replace a section or joint that will have the water goes off for a bit. Provided that all valves are closed to both sides beyond the area to repair the remaining water is held in place by a vacuum is formed behind the water pipes. If any valve the vacuum was broken and the water will flow from the repair area opens. Repair video and reopen the main valve. This will restore water pressure to the system. However, you have all the air trapped in the lines to have them opened. Simply move to a high point in the water system and open a faucet. Spit and spit water for a time as the air moves out of the lines. Then flows freely air out and you're done. Know this was a long answer, but wanted to make sure you understand why water will not come out if the proper steps are followed. Good luck and hope this helps.
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