What do the solenoid valve arrows, F and DE in the PID diagram mean?
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What do the solenoid valve arrows, F and DE in the PID diagram mean respectively? Thank you.
DE: de-energize power loss TSO: tight shut off emergency shut-off valve
F:FAILURE DE is the explanation given by the brother upstairs, the correct answer
The TSO translation is wrong, it means no leakage shut-off, not an emergency shut-off valve. This type of valve is generally used for emergency shutdown, but should not be translated as such.
The first type is solenoid valves connected in parallel, and the second type is solenoid valves connected in series. The usage is quite special. Domestic designs rarely use these, especially the second type, which also comes with an accident air tank, which can last for 20-30 minutes. When the first type of solenoid valve is connected in parallel, it is a reliable and non-safety type; when the second type of solenoid valve is connected in series, it is a safe and non-reliable type. F generally means fault, DE means the solenoid valve is de-energized, and TSO means it is a closed non-leakage valve, which means there are leakage level requirements for the valve when it is closed. Your design should be something from foreigners. It is rare to see such a high-end design in China.
What does that refer to specifically? Is it also a power outage?
I feel like you are a great god. What specific situations does F represent?
The second type is to control pressure regulation and venting, which is very important, so an accident instrument air tank is installed.