I just replaced an outdoor spigot with a ball valve. Now when I open the valve the water comes out with a huge pressure...do you know why ? When I had the spigot in place that one provided a much smoother water flow.
what could be the reason?
The ball valve offers a straight through path for the water. It's bore hole is highly likely to be smaller than the feed pipe behind it so the bore acts like a hose nozzle.
The older style faucets have a complex path flow for the water through the device which causes turbulence in the flow and also a pressure drop. This is what makes it look to you that the flow is somehow more gentle.
Quarter-turn ball-valves are designed to be entirely on or entirely off. The aperture at intermediate positions does not vary linearly with handle position.
There are two major types of ball-valve, standard and full-bore. A full-bore ball-valve is pretty much designed to give you either no-flow or full unrestricted flow.
Ball valves are not intended to give fine control over the rate of flow. They are excellent for isolation, service or shut-off valves.
Normal outdoor taps (spigots) are designed with a multi-turn handle designed to progressively regulate the flow in a way that varies more linearly with the rotation of the handle. The greater number of turns also provides finer control over flow. A quarter turn of such a tap may provide adequate flow for some uses but is probably a small fraction of full aperture.