Symbol for quick release valve
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What is the symbol for the quick release valve on the air line?
The question is too general. Quick-opening and closing valves can all be represented as XV-111; if the centrifugal compressor has a built-in vent, it is denoted by BOV.
Is the vent on the pipeline also a BOV? Are there graphic symbols?
BOV is merely an indicator for the exhaust valve at the outlet of the centrifugal compressor; it can be considered as a dedicated device； It depends on the vent valve installed on the pipeline; if it is a valve that can be opened and closed quickly, use XV. By the graphic symbol you mentioned, do you mean how it is represented on the drawings? You can look that up – there are industry standards for this.