A properly plumbed power beyond sleeve (as yours apparently is) blocks off the normal return to tank passages from the center (or pressure supply) passages. The return to tank port is still there, and still in use. When the valve is actually in use (like when operating the loader) the oil flowing out and back into the work ports is directed through those passages and back to tank so to speak. It's also in play when the loader relief valve opens providing that low pressure relief flow a free flowing path back to tank.
Often the sleeve is referred to as a closed center adapter because if you install a plug into the port instead of a fitting and a line leading to another valve, then the valve can actually be used on a closed center system. In that case no fluid ever exits that fitting. The tank return port is still used, but only for oil returning through the work ports.
If you read through this material it may help give you a sense of why you're better off with a functioning power beyond sleeve in your valve than you were without one.
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