A globe valve steers the flow up through a round seat, where a plug on a stem throttles it. Turn the handwheel to set exactly how much gets through.
A globe valve is a valve built around a round seat inside a rounded body. A plug on the end of a stem sits over that seat, and turning the handle moves the plug closer to or further from it. That lets the valve be set at any position, so it is used wherever flow needs to be regulated, not merely switched.
From the outside it is just a bulbous body with a handle on top and a pipe each side. The part that matters is hidden: the baffle that forces the flow to take a turn, and the plug-and-seat pair that sets how much fluid can pass.
Fluid arrives at the inlet, but the inner baffle stands in its path. It cannot go straight across, so it is redirected upward toward the seat in the middle of the body — which is why the flow inside a globe valve takes an S-shaped route.
The plug sits directly over the round seat. Lowered all the way down it seals the opening shut; lifted a little it lets a thin flow through; lifted clear it opens the way wide. Its position is what sets the flow.
The stem threads through the bonnet. Turning the handwheel turns the stem, and because the stem is threaded, that rotation is converted into straight up-and-down movement of the plug.
Once fluid has passed the seat it flows on to the outlet. Raise or lower the plug and the outlet flow rises or falls with it, so the valve can be set anywhere from fully shut to wide open.
It is a valve with a round body and an internal baffle that forces the flow up through a round seat. A plug on a stem sits over that seat, so turning the handle sets exactly how open the valve is.
Because of its rounded, bulb-like body. The internal baffle makes the fluid travel an S-shaped path up and over the seat, which is the shape the name refers to.
The trim is the set of internal fluid-touching parts — the seat, the plug and the stem tip. Their shape decides how the valve throttles and how tightly it seals.
Yes. Their plug-and-seat design lets them be set part-way open and adjust flow smoothly, which is why they are common wherever flow must be regulated rather than just switched.
They do. The flow has to turn sharply through the seat, so a globe valve drops more pressure than a straight-through valve of the same size — the trade-off for fine control.