These valves are just like gate valves and use linear motion to throttle circulate. They are used to control the circulate in a pipeline they usually regulate by the place of a movable disk in relation to the stationary ring seat.
A strain regulator requires no more plumbing than a ball valve. A regulator will restrict the utmost pressure however not move till the set point is reached. The highest high quality valves could have the trunnions integral with the ball. The actual bearing floor of the trunnion may be a replaceable sleeve.
The bearings will be replaceable inserts in the bonnet and backside flange. Popular bearing materials are austenitic chrome steel which has been floor treated to eliminate its galling tendencies and PTFE. Various choices have been introduced to eliminate the high price of integral trunnions. Short stub shafts have been keyed and/or shrunk into blind holes in the ball.
The major advantage of a globe valve is, it does not leak as a lot as different valves. The relationship between resistance, strain, and move is complicated.
But in brief, a restriction like a half-open ball valve will solely cut back the downstream pressure and volume when the water is actually moving. It does nothing to change the 'static stress', which is the stress in the lines when no water is being used. So a half-open valve could help in some situations however it is not going to help with issues attributable to excessive static stress, like operating rest room valves and other leaks. To answer your question; A ball valve solely controls circulate not stress. A few seconds after water is flowing a ball valve will limit the pressure based on the circulate.