Water pressure regulator - relative or fixed/absolute reduction?
I have a pair of Watts pressure regulators in my plumbing system, one for the hot and one for the cold water feed (didn't have a 1" PEX tool at the time and the tool would have costed more than a 2nd regulator).
Recently added in water pressure gauges for hot and cold post-regulator. In doing so, I find it interesting that the water pressure can go up and down in an at-least 5 psi range. Note: gauge on the hot water side is before the heater, where I have since installed an expansion tank (these things are apparently optional in B.C.).
So, wondering if the pressure regulators are (supposed to be) relative, i.e., reduces pressure by 20 p.s.i., or absolute/fixed, i.e., reduces pressure to 50 p.s.i. , or some other, say reduces pressures to 50 p.s.i. if supply is 80 p.s.i. but to 53 p.s.i. if it is goes to 85 p.s.i?
Recently added in water pressure gauges for hot and cold post-regulator. In doing so, I find it interesting that the water pressure can go up and down in an at-least 5 psi range. Note: gauge on the hot water side is before the heater, where I have since installed an expansion tank (these things are apparently optional in B.C.).
So, wondering if the pressure regulators are (supposed to be) relative, i.e., reduces pressure by 20 p.s.i., or absolute/fixed, i.e., reduces pressure to 50 p.s.i. , or some other, say reduces pressures to 50 p.s.i. if supply is 80 p.s.i. but to 53 p.s.i. if it is goes to 85 p.s.i?
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