What is ZSC and Zso?
What is ZSC and Zso?
ZSC. Position/unit switch closed. Limit switch indicating a valve is closed. ZSO. Position/unit switch open.
What does Z stand for in instrumentation?
Instrument Abbreviations Used in Instrumentation Diagrams (P&IDs) III
| First Letters | Initiating, Measured, Variable | Switches & Alarm Devices* |
|---|---|---|
| WD | Weight/ Force, Differential | WDSH |
| X | Unclassified | |
| Y | Event/State/ Presence | YSH |
| Z | Position/ Dimension | ZSH |
What is the symbol for a butterfly valve?
Butterfly valve symbol is the only symbol where a full triangle is not used. If you refer to the first symbol, it is similar to a globe valve but a triangle is not full. The alternative symbol is clearer in this case. For isometric symbols, you can see that there is no socket end butterfly valve.
What is a LV valve?
A level control valve or altitude control valve is a type of valve that automatically responds to changes in the height of a liquid in some storage system. A common example is the set of ballcocks in a flush toilet, where each stage of the flush cycle is actuated by the emptying or filling of the tank.
What is LSH P&ID?
LSH = level switch high.
What is the symbol for a check valve?
An arrow or the symbol for any type of check valve (a fluidic/pneumatic logic symbol) on the outside of the body indicates flow direction. In this image, flow is from top to bottom.
What is PFD drawing?
A process flow diagram (PFD) is a diagram commonly used in chemical and process engineering to indicate the general flow of plant processes and equipment. The PFD displays the relationship between major equipment of a plant facility and does not show minor details such as piping details and designations.
What is PY in P&ID?
P. PAD – Pressure Alarm Device. PY – Pressure Computer. PCV – Pressure Control Valve. PC – Pressure Controller.
What is difference between P&ID and PFD?
PFDs are used for visitor information and new employee training. A Process and Instrument Drawing (P&ID) includes more details than a PFD. It includes major and minor flows, control loops and instrumentation. P&ID is sometimes referred to as a Piping and Instrumentation Drawing.
