If a pneumatic on/off valve is of type SIL3, does that mean the solenoid valve associated with it is also of type SIL3?
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If a pneumatic on/off valve is of type SIL3, does that mean the solenoid valve associated with it is also of type SIL3? To perform the SIL calculation for the entire circuit now, it is necessary to know the SIL level of each part within the circuit.
I’m hearing about this for the first time; I’m not sure. It seems to me that there’s no such thing as this
The valve is also a small system; from the actuator to the air supply pipe and then to the solenoid valve, all these components are part of the same system, so they must all be of SIL3 level.
I have encountered PLCs with SIL2 rating before, specifically the GE 9070 series; their card structure is designed for SIL2. I am also very interested in the question you raised.
It needs to be SIL3, because this is a loop and integrity is required.
During the SIL calculation, it is done on a per-loop basis; once the SIL level of a particular loop is determined, and if it is established that the pneumatic on/off valves in that loop must meet SIL3 requirements, then all components of those valves, including solenoid valves, must also satisfy the SIL3 standards.
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A complete circuit includes a logic unit + detection + control; as long as the overall combination meets the requirements for that level, it’s sufficient
If the valve is certified as a whole, then it is SIL3