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Sounds like a bad/failed water pressure regulator.
No, it uses water pressure.
Yes, because the water you are recirculating is already past the pressure regulator.
presure regulator is on the incoming cold water line
That depends where the regulator is fitted.
Yes
A water pressure regulator can be found in many of the common department stores. Costco, Walmart and Target are all options to find this for purchase.
I'm not a plumber, but I would look for an adjustable inline water pressure regulator
On the discharge line with the relief of the pressure control back to suction
Normally screwing in the set screw increases pressure loosen less pressure
The only time you would need a Pressure Regulator Valve is when the pressure from your supply is too high. The Valve will lower the pressure to a usable pressure and keep it constant.
To correct the pressure in water pipes, you can adjust the pressure regulator valve. Locate the pressure regulator valve, which is typically found near the main water line or near the water meter. Using a wrench, turn the adjusting screw clockwise to increase the pressure or counterclockwise to decrease it. Be cautious not to exceed the maximum recommended pressure for your plumbing system.