Pressure reducing valve

[dba7108]

I've bought an instant hot water tap for the kitchen. I'm unsure what my water pressure is but the company says if its under 4.7 then I don't need one.
Can you reduce pressure by installing an isolating valve and reducing the flow? Are the 2 the same?

[OutInTheShed]

No, a partially closed valve will give full pressure when there's no flow.

A lot of houses already have pressure regulating valves on the whole house supply, sometimes just excluding an outdoor tap.

[98elise]

OutInTheShed said:

No, a partially closed valve will give full pressure when there's no flow.

A lot of houses already have pressure regulating valves on the whole house supply, sometimes just excluding an outdoor tap.

This. You will only get temporarily reduced pressure while the water is flowing. As soon as the flow stops the pressure equalises because the valve is partly open

A PRV closes off at the desired pressure.