Control and pressure regulating valves cause a high pressure drop across their components. This high pressure drop often creates excessive noise that is too high for nearby workers, or results in disturbance of local residences. Shiraz Mechanic’s diffuser silencer can offer an effective way of reducing the noise by distributing pressure drop, therefore substantially reduces noise. We design and choose the correct hole sizing and spacing which will cause the optimum noise reduction and pressure drop for various valves and piping systems. It is also important to match the diffuser flow capacities to the individual system requirements.