  We provide a description of the space of continuous and translation invariant
Minkowski valuations $\Phi:\mathcal{K}^n\to\mathcal{K}^n$ for which there is an
upper and a lower bound for the volume of $\Phi(K)$ in terms of the volume of
the convex body $K$ itself. Although no invariance with respect to a group
acting on the space of convex bodies is imposed, we prove that only two types
of operators appear: a family of operators having only cylinders over
$(n-1)$-dimensional convex bodies as images, and a second family consisting
essentially of 1-homogeneous operators. Using this description, we give
improvements of some known characterization results for the difference body.
