A sand slurry valve that includes a mandrel within a housing and a seal assembly connected to the mandrel. A portion of the housing includes a seal bore. The mandrel is movable within the housing such that the seal assembly may be positioned within the seal bore. The mandrel includes a flow passage adapted to provide rotational fluid flow through the housing prior to the seal assembly being moved into the seal bore. The seal assembly may include a seal, a first backup ring, and a second backup ring with the second backup ring positioned between the seal and the first backup ring. The rotational flow through the housing may help to protect the seal from being damaged by particles carried within the flow. The first backup ring may have a harder durometer measurement than the second backup ring, which may have a harder durometer measurement than the sealing element.