What is the name of the valve that is normally open, power closed, and located between the two safety shut off valves?

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The vent valve is placed between two safety shut-off valves to provide a controlled vent path for any gas in the segment when the line is being isolated. Being normally open and power closed means it stays open during normal operation to vent the line, and it closes when power is applied so you can achieve a tight isolation between the two shut-offs. This arrangement prevents trapped gas and allows safe depressurization during maintenance or after shutting off the upstream and downstream valves. A bleed valve is typically used for small purge flows and isn’t the standard device between two safety shut-offs, while a relief valve protects against overpressure and isn’t configured as a normally open, power-close vent between shut-offs. The isolation valve itself isn’t the vent; it’s the device that actually stops the flow.