What do the markings on valves in P&ID diagrams mean?
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This post was last edited by dbsn2008 on 2022-12-15 at 15:57. Experts, what do these two diagrams represent, and what are the differences between them?
The second diagram shows a on-off valve, where ZSO represents on and ZSC represents off. So what does ZT mean? What does the diamond shape I mean? Is the first HV a manually adjustable valve? Why are there HZS A and HZS B?
This post was last edited by Shi Xiaodong on 2022-12-15 at 19:01. There are legends provided for reference; each design institute may use different abbreviations, but I can identify the common ones. A circle indicates \"displayed on-site\", a circle inside a box means \"displayed on DCS\", and FC in the middle of a valve denotes fault closure, indicating that it is a gas-actuated valve. An I in the middle of a diamond usually indicates a local logic input ； ZSO: status switch (on); ZSC: status switch (off)
I can’t understand PID; I’ll first check the diagrams on the homepage and the standard specifications, so that I can learn in a more systematic way.