The bladder type water muffler is a new type of liquid pipe muffler, by which the pulsating pressure and the acoustic noise of the fluid can be well absorbed. The theory here is the changed pressure generated by the built-in airbag when it meets the pulsating liquid. Howev-er, the performance of the muffler depends enormously on the relationship between the infla-tion pressure of the airbag within the muffler and the pressure of the piping system. In this paper we aim to design a test bench with continuously variable pressure of the piping system to approve their relevance to the performance of the muffler. In the experiment, the optimal state of the muffler is found by adjusting the inflation pressure of the muffler airbag and the pressure of the system pipeline. Meanwhile, the relevance of the inflating pressure in the bladder and working pressure of the pipe system to the performance of the muffler is further verified, which provides a useful guide for the application of the muffler on ships and submarines.
