Problems with the installation of the safety valve outlet pipe

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I would like to ask the experts: in a setup like the one shown in the diagram below, the outlet pipe of the safety valve leads back to the inlet of the metering pump, with the pump’s inlet connected to the bottom of the feed tank. 1. If the shut-off valve in front of this pump is fully open under normal operation, does it become ineffective? Does the outlet of the safety valve then connect directly to the material tank? 2. If the installation height of the safety valve is not high (below the liquid level of the material), does that mean the outlet pipe will also be submerged by the material? Will this affect normal pressure release? 3. Or should the outlet pipe be connected directly to the gas phase interface of the material tank? In that case, the outlet pipe goes through a rising process – could this lead to the accumulation of liquid? 4. Is the valve next to the pump there to allow the pump to start under no-load conditions?