L-valine(in) + H(+)(out) = L-valine(out) + H(+)(in)
l-valine(in) + h(+)(out) = l-valine(out) + h(+)(in)
L-valine(in) + H(+)(out) = L-valine(out) + H(+)(in)
l-valine(in) + h(+)(out) = l-valine(out) + h(+)(in)