Dear Otávio Manhães de Queiroz,

You may want to look over the following info:

Managing Water Loss with Pressure Reducing Valves

https://www.waterworld.com/wastewater/treatment/article/16194068/managing-water-loss-with-pressure-reducing-valves

Can a PRV stop water flow?

Unfortunately, over time, a regulator valve may develop blockages that restrict flow beyond the intended amount. Such blockages often stem from high mineral content in your municipal water supply. These mineral deposits accumulate inside of the valve body, leading to lower-than-intended home water pressure.

Does a PRV prevent backflow?

Backflow preventors prevent water from cross-contaminating the supply (typically city water) and are required for cross-connection in many cities for non-potable water use. These are used to prevent water from backwashing into water supply lines.

How do you use a pressure reducing valve?

Many valves have a nut, screw, or knob attached to them that allow you to do the actual adjusting. Turning the screw or knob clockwise typically increases the water pressure while turning it counter-clockwise lowers the pressure.

Which way do you turn a PRV to reduce pressure?

As you tighten the screw, the water pressure will become greater and as you loosen it, the water pressure will lessen, so turn the screw clockwise to increase the pressure, or turn it counterclockwise to decrease the pressure.

When should I install PRV?

A pressure reducing valve can be installed on the water main just before any faucets or devices. This will ensure that all fixtures get water at a reduced rate. Ideally, water pressure will be no higher than 60 PSI.

Dear Otávio Manhães de Queiroz,

Find some auxiliary info below:

Does PRV work as check valve?

First, no, they don't function as a check valve. They limit inflow by dynamically changing the valve opening so that when less pressure is on the out side, the valve opens up fully, and too much pressure on the out side causes the valve to shut.

Is a check valve A relief valve?

Low Pressure Relief Valves Inline spring-loaded check valves can be used in low pressure relief applications. Utilizing either elastomeric, thermoplastic or metal to metal seals, these valves can be custom-built with spring materials ranging from stainless steels to Titanium, Inconel, or many others.

Can you flow backwards through a regulator?

So if the regulator is like the one you see in the second picture, and if the inlet pressure is lower than the discharge pressure, the fluid can open push the valve open and flow backwards through the regulator.

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Pressure Relief Valve Installation and Operation Guide

Valve Sales, Service and Distribution Industry News

https://alliedvalveinc.com/the-valve-expert/pressure-relief-valves-guidelines-for-installation-and-operation/

PRVs: How To Save With a Home Water Pressure Regulator

https://www.attainablehome.com/how-to-save-with-a-home-prv/

Correct Sizing of a Pressure Reducing Valve

https://allvalve.com.au/plumbing/news/newsPRVsize.htm