Vacuum Pumps are designed primarily to handle a gas, such as air. They normally operate with an open discharge to the atmosphere. Water is usually used as a liquid compressant on vacuum pumps and the amount of water varies depending on the degree of vacuum that is required. Since the vacuum pump discharges both air and water to the atmosphere, there are two problems involved: discarding the water, and silencing the air noise flowing from the discharge.

Intake Silencers are seldom required in vacuum pump operations unless removal of process liquid is required, prior to entry into the pump. A pump or "barometric leg" is required to remove the liquid from the intake separator, because of the vacuum conditions. All Intake Silencers are designed for full vacuum service.

Discharge Separator Silencers are normally used on wet vacuum systems to reduce the discharge noise and simultaneously separate the liquid, which can be recovered or piped to a drain.

Stoddard Silencers can furnish separator silencers in sizes required for all vacuum systems.