  We investigate the transport problem that a spinful matter wave is incident
on a strong localized spin-orbit-coupled Bose-Einstein condensate in optical
lattices, where the localization is admitted by atom interaction only existing
at one particular site, and the spin-orbit coupling arouse spatial rotation of
the spin texture. We find that tuning the spin orientation of the localized
Bose-Einstein condensate can lead to spin-nonreciprocal / spin-reciprocal
transport, meaning the transport properties are dependent on / independent of
the spin orientation of incident waves. In the former case, we obtain the
conditions to achieve transparency, beam-splitting, and blockade of the
incident wave with a given spin orientation, and furthermore the ones to
perfectly isolate incident waves of different spin orientation, while in the
latter, we obtain the condition to maximize the conversion of different spin
states. The result may be useful to develop a novel spinful matter wave valve
that integrates spin switcher, beam-splitter, isolator, and converter. The
method can also be applied to other real systems, e.g., realizing perfect
isolation of spin states in magnetism, which is otherwise rather difficult.
