What is a cut-off valve?
Thread Content
I often come across the term \"shut-off valve,\" and I used to think that a shut-off valve was simply a gate valve. But it seems that’s not the case. I would like to ask fellow sailors: what are the similarities and differences between shut-off valves, gate valves, and ball valves? Please be more detailed!
Globe valves, also known as gate valves or sluice valves, are the most widely used type of valve. It controls the opening and closing of the valve by raising or lowering the gate; the gate is perpendicular to the flow direction, and changing the relative position between the gate and the valve seat adjusts the size of the passage. The globe valve is the most widely used type of shut-off valve in chemical production. Unlike the shut-off valves mentioned earlier, it does not open or close by rotating its closing element; instead, it uses the upward and downward movement of the valve stem to move the connected circular valve disc (valve head), thereby changing the distance between the valve disc and the valve seat to control the opening and closing of the valve. Pneumatic shut-off valves consist of a multi-spring pneumatic diaphragm actuator or a floating piston actuator together with a control valve, and they receive signals from control instruments to regulate the flow of fluid in the process pipelines, either by shutting it off, allowing it to flow, or switching it between these states. It features a simple structure, high sensitivity, and reliable operation. It is widely used in automatic control systems. Isolation valves are generally used in situations with high pressure differences
In my opinion, valves that serve to shut off flow in pipelines are all called cut-off valves. Ball valves, gate valves, globe valves, butterfly valves... are all such valves
As mentioned on the 3rd floor, the term \"cut-off valve\" is used merely for the classification of valve functions. It serves to cut off. Any valve that can block a passage can be broadly referred to as a shut-off valve, depending on its role in the process. But generally, when we talk about cut-off valves, we are referring to emergency cut-off valves – those valves that can be operated quickly and shut off the flow path in an instant. It acts swiftly to cut off the path when it detects that the signal from the downstream medium exceeds the specified limit. This post was last edited by Wa Kuai Tou on 2009-3-13 16:53]
I’ve never heard of a shut-off valve; it seems that any valve that can be used to shut off flow can be considered a shut-off valve. There is no relevant definition
The shut-off valve should correspond to the control valve; for example, in oxygen valves, there is an oxygen shut-off valve and an oxygen control valve
The definition of a cut-off valve is a valve used to stop the flow of fluid. It generally refers to valves that can meet the relevant shut-off requirement levels. Of course, in the industry, this generally refers to soft-sealed and hard-sealed valves that can achieve zero leakage. Typical examples include gate valves, ball valves, butterfly valves, etc. They are widely used for fluid cutting.
The purpose of the cut-off valve in our company is to prevent LPG leaks: when loading or unloading LPG, if the driver starts the vehicle without permission and pulls apart the loading/unloading pipes, the cut-off valve will close instantly to prevent such leaks. It seems that cut-off valves are safety/redundancy devices, while globe valves are a general term for a type of valve.
The cut-off valve is a SLAM SHUT VALVE