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The easiest way is to install two pressure gauges (If reducing pressure) either side of the reducing valve, you will then have indication of upstream pressure and down stream pressure, of which you can adjust to suit you process.
Install a pressure reducing valve
pressure relief valve relief the excess pressure which is developed in the syatem, while pressure reducing valve reduces the pressure and supply it to the system.
If you'd prefer lower pressure than 80, install a pressure reducing valve and set it down to desired pressure.
Pressure reducing valve reduces the pressure of fluid upto a predetermined pressure in this case downstream pressure will be obviously lower than upstream pressure but in case of pressure regulating valve it will regulate the pressure( either increase or decrease) depending on the requirement of system at that time.
Codes vary, check max. press. allowed in home, if press. higher than allowed by code coming into home, than install pressure red. valve.
With a pressure booster pump or a Pressure reducing valve
nothing, its just terminology why A pressure relief valve is a safety device to prevent over pressure in such things as compressor receivers. A pressure reducing valve drops the pressure to the requirements of the user or tool. Such as a demand valve on scuba gear.
If your pressure exceeds the setting of the PRV or is below the setting
no
no it can't , valves you can use are a prv pressure reducing valve or a globe or flow valve
pressure reducing valve is required.