Issues with emergency shut-off valves
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Has anyone used an emergency shut-off valve with two solenoid valves? DCS controls one, SIS controls one
It is recommended to reflect all the issues, without asking who has used them. Who has used it? It has several meanings: showing off, asking questions, inquiring about usage patterns,...;P
To reduce costs, this is used in practice.
This is useful, and it’s possible to do this as well, but priorities need to be considered
This is quite normal – two solenoids are connected in series; the issue lies in whether they are normally open or normally closed. Under normal conditions, the DCS takes control, but in an emergency shutdown scenario, it is the solenoids of the SIS that come into action
I’m sorry, I haven’t used it. I want to use it this way.
Modular servo valve assemblies – as long as the principle makes sense, it’s worth giving it a try.
This post was last edited by Wang Tianze on 2018-4-9 at 21:50. This type of configuration is quite common; take a look at the contents in Explanation 7 of GB50770
DCS controls the solenoid valves that are used in normal operations, while SIS controls the interlock solenoid valves. An SIS interlock is triggered in case of an emergency in the process or system. This prevents the leakage of flammable, toxic, harmful gases, liquids, and other substances, thereby ensuring personal safety.
I knew that two solenoids could be used in series, but I wasn’t clear about the control sequence; I learned about it this time