What do YL, LS, and LV mean in instrument drawings?
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This post was last edited by qiushuiweihan on 2010-9-25 10:46. What do YL, LS, LV mean in instrument diagrams?
LS is a level switch, LV is a level control valve; I’ve never seen such a symbol as YL before. . I have seen “YL” on the model numbers of pressure gauges; I’m not sure if that’s the correct designation. Please point out any errors if there are any.
Reply 1# qiushuiweihan: Does YL indicate a fault status? I’ve seen RL used to indicate an operational status
YL generally indicates the operating status of a pump or other electrical equipment.
YL doesn’t know; LS refers to the level switch, while LV denotes the level control valve
HV manual control valve, OV potential control valve, KV switch valve, ZV automatically regulating switch valve, CV automatically controlled valve – let’s learn from each other*
The English abbreviation mentioned by the poster should be enclosed within a specific symbol; it is likely an indicator light indicating the operating status.
The operating status indication for YL pumps or other electrical equipment: in my opinion, it should be a pressure indicator. LS refers to the level interlock switch, while LV refers to the level control valve
YL is an indicator of operating status; “Y” represents the status, while “L” indicates the light. LS is a level switch, and LV is a level control valve. These can be found in the alphabetical code table for instrument function indicators
I agree with the opinion above: YL indicates the operating status; “Y” represents the status, while “L” refers to the indicator light. LS is the level switch, and LV is the level control valve. All of these should be explained in the diagram on the PID main page
YL generally refers to the operating status indicator; LS is the level switch, and LV is the level control valve