If there is a pipe section with two vacuum pumps at each end of the pipe. Before the second pump, there is a fast closing valve that can close in 14 ms. In case of a sudden leak close to the first pump due to any reason, the fast closing valve needs to close quickly enough to protect components beyond the second pump. However, it is expected that the atmospheric pressure air advancing from the side of the first pump to the second pump would advance near the speed of sound. So the fast closing valve may not be fast enough to close before a pressure rise happens at the second pump area. Is there a way to rebuild the pipe connecting the first with the second pump so that it slows down advancing air at atmospheric pressure? without adding constrictions or adding indirect path lengths?

Much thanks for your help!!!