Valve refers to a valve whose closure (disc) moves along the center line of the seat. According to the movement of the disc, the change of the seat opening is proportional to the disc travel. Because the stem opening or closing stroke of this kind of valve is relatively short, and has a very reliable cut-off function, and because the change of the seat opening is proportional to the disc travel, it is very suitable for flow regulation. Therefore, this type of valve is very flexible for cutting or regulating and throttling.
During the opening and closing process, the friction between the disc and the sealing surface of the valve body is smaller than that of the gate valve, so it is wearable.
(2) The opening height is generally only 1/4 of the seat passage, so it is much smaller than the gate valve.
There is usually only one sealing surface on the valve body and disc, so the manufacturing process is better and easy to maintain.
(4) Because its filler is generally a mixture of asbestos and graphite, it has a higher temperature resistance. Generally steam valves are cut-off valves.
The minimum flow resistance of globe valve is also higher than that of most other types of valves because the flow direction of medium through the valve has changed.
(2) Because of the long travel, the opening speed is slower than the ball valve.