Nov.08.2024
Globe valves, gate valves, butterfly valves, check valves, ball valves, etc. are all indispensable control components in various pipeline systems. Each type of valve is different in appearance, structure and even function.
When the stop valve is opened and closed, it has a rising valve stem. When the handwheel is turned, the handwheel will rotate and lift with the valve stem; while the gate valve turns the handwheel to make the valve stem move up and down. The position of the handwheel itself constant.
The gate valve only has two states: fully open or fully closed. The opening and closing stroke of the gate plate is large and the opening and closing time is long. The movement stroke of the valve plate of the stop valve is much smaller, and the valve plate of the stop valve can stop at a certain position during movement. One is used for flow regulation, while the gate valve can only be used for cutting off and has no other functions.
The stop valve can be used for both cutting off and flow adjustment. The fluid resistance of the stop valve is relatively large, and it is more laborious to open and close. However, because the distance between the valve plate and the sealing surface is short, the opening and closing stroke is short.
The gate valve can only be fully opened and fully closed. When it is fully open, the medium flow resistance in the valve body channel is almost 0, so the opening and closing of the gate valve will be very labor-saving, but the distance between the gate plate and the sealing surface is long, and the opening and closing time is long.
The gate valve has the same flow effect in both directions. There is no requirement for the inlet and outlet directions during installation, and the medium can flow in both directions.
The stop valve needs to be installed strictly in accordance with the direction marked by the arrow on the valve body. There is also a clear regulation on the inlet and outlet directions of the stop valve. my country's valve "three modernizations" stipulates that the flow direction of the stop valve must be top-down.
The structure of the gate valve will be more complex than that of the globe valve. From the appearance point of view, under the same diameter, the gate valve is taller than the globe valve, and the globe valve is longer than the gate valve. In addition, gate valves are divided into open stems and concealed stems, while stop valves do not.
