Can a control valve be used for shut-off purposes?
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Should a shut-off valve be added in front of it?
Generally, it’s not possible; its design is not intended for cutting off flow. Moreover, the leakage level of regular control valves is typically grade IV, while cut-off valves usually have a leakage level of at least grade V.
I think it’s possible. However, this \"self-control valve\" is usually a on/off valve rather than a control valve
It mainly depends on the application and the requirements for the control valve; it’s possible to achieve it if the requirements aren’t high!
If your control valve is of the on/off type, it can be used for cutting off flow; if it’s a regulating type, it’s better to install a cut-off valve in front of it! Beijing Alken Valve Co., Ltd., Zhang Zilong, 13554412277
Adding a three-way solenoid valve will do. Connected in series to the instrument air supply, controlled by an electrical signal for power on/off.
In normal design, programmable valves are not allowed to be used as shut-off valves, as the sealing requirements for shut-off purposes differ between programmable valves and manual valves. Furthermore, the switching of programmable valves relies on pneumatic components, and whether a reliable cut-off can be achieved depends on the accuracy of the control components. Manual valves rely on human intervention to ensure that the cut-off is properly made.
Check the sealing rating of your control valve, as well as its opening and closing time. A sealing performance of level 5 is sufficient; a straight-stroke control valve can be used as a shut-off valve, which results in a shorter opening and closing time, but at a higher cost.
Control valves can also be used for shutting off, but the valve stem and seat need to be ground to meet the requirements for sealing performance; moreover, control valves generally can only provide one-way sealing. In the past, many oil refining plants in China used a combination of control valves and solenoid valves to achieve regulation and interlocking functions.:lol
Control valves fall into a very wide range; they are generally divided into two main categories: 1. On/off valves 2. Control valves. The on/off valves among control valves are also known as shut-off valves. Depending on their structure, shut-off valves can be further classified into butterfly valves, ball valves, diaphragm valves, gate valves, and so on. The specific type of shut-off valve to use should be chosen based on the actual operating conditions at your site! :) :) If you have any questions regarding control valves in the future, feel free to contact me! QQ: 928976489 (Italian LAPAR)