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In certain cases, yes.
A diode is a valve for current.
A relay is a switch that is actuated by current.
If you have a flow of current going from A to B and you only want it to go from A to B you can use a diode in series between A and B.
You can also use a switch in series between A and B that is controlled by a relay that is in parallel with the switch. Add a large resistor in series with the relay so that it does not permit too much current to back flow through it.
Configure the relay to open the switch when the current is trying to go from B to A and to close when the current is trying to go from A to B.
This is not a leak free valve. Current will be going back through the relay while it is holding the switch open. As mentioned put a large resistor in series with it to reduce this. You cannot have this resistance too large though or the relay will not have enough current to maintain the switch.
Another caveate is that this will not be a fast acting valve. There will be some time during current direction changes when the switch will be spending time openning and closing. It is a mechanical switch after all.
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