watts 530c-std 1/2

Does that sound like a correct assessment of the problem, and if so, is it best to replace the filter and cartridge in the current regulating valve, or replace the entire valve?

4 Relief Valve

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Are the "staff from the supplier" trying to sell you products? If not, why do you doubt their on-site assessment vs something someone from the other side of the Internet could tell you about the situation?

Watts LF530C

Based on your assessed level of difficulty of replacing the entire valve, replacing the filter and cartridge sounds like it would be the reasonable first step.

The staff reported that the pressure regulating valve going into the property likely is not functioning properly, but also reported that they know little about such valves.

Watts530C

If that doesn't help, you then move on to the more difficult (and likely more expensive) task of replacing the whole valve.

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Many water regulators are dirty or need a rebuild kit. Cleaning the regulator inlets and orifices may fix things. A rebuild kit may be needed. normally the diaphragm is the component that usually fails most kits come with a new spring and diaphragm. some as cheap as $15.00 for just the diaphragm. Kits that have the entire internal setup spring, diaphragm, valve, screen, o rings, screws. Can cost over 100$.

The water pressure inside a property is low. The property obtains water from a municipal water supplier. Staff from the supplier measured the incoming water pressure and reported it was within normal range (at the high end of the range, actually).