--- title: Vacuum Pump Silencers url: "https://www.envanio.com/us-en/noise-control-and-air-filtration/products/product/vacuum-pump-silencers" date: 2026-09-24 modified: 2026-10-13 --- # Vacuum Pump Silencers ![](https://www.envanio.com/fileadmin/01_Images/02_Noise_Control_and_Filtration/01_Productrenderings/01_freigestellt/01_SVG/Envanio_Universal_Vacuum_Pump_Silencer_RVCS-UVCS.svg "Vacuum Pump Silencers") ![](https://www.envanio.com/fileadmin/01_Images/02_Noise_Control_and_Filtration/01_Productrenderings/01_freigestellt/01_SVG/Envanio_Universal_Vacuum_Pump_Silencer_RVRS-UVRS.svg "Vacuum Pump Silencers") Industrial Silencers ![](https://www.envanio.com/_assets/15aee9713160ee0bd4ef9d7c531927c0/Icons/logo-universal.svg) Vacuum Pump Silencers ===================== Remove liquids from gas-flow vacuum systems serving liquid-sealed rotary positive displacement blowers and liquid ring vacuum pumps with Envanio Universal’s vacuum pump liquid separator-silencers. Depending on the application, separator-silencers may be required for both the inlet (vacuum side) and the discharge (atmospheric side) of a vacuum system. An inlet separator removes most or all process liquid before it enters the vacuum pump, helping protect the equipment from corrosion and extending its service life. [ Request a Consultation ](https://www.envanio.com/us-en/contact-sales-envanio) ![](https://www.envanio.com/fileadmin/04_Icons/SVG/Envanio_ICONS_Effective_Noise_Attenuation.svg "High-Quality Performance")### High-Quality Performance Our high-performance separator-silencers combine proven separation efficiency with exceptional sound attenuation for even the most demanding applications. ![](https://www.envanio.com/fileadmin/04_Icons/SVG/Envanio_ICONS_Compatibility_and_Flexibility.svg "High Compatibility and Flexibility")### High Compatibility and Flexibility The silencers are available in four standardized product lines and allow different maximum liquid flows depending on various drain sizes. ![](https://www.envanio.com/fileadmin/04_Icons/SVG/Envanio_ICONS_Kompakt_und_Robust.svg "Durable Product Design")### Durable Product Design An inlet separator removes most or all process liquid before it enters the vacuum pump, helping protect the equipment from corrosion and extending its service life. [ Series Comparison ](#c605) [ Typical Applications ](#c241) [ Typical Industries ](#c242) [ FAQ ](#c243) [ More Products ](#c244) [ Request a Consultation ](https://www.envanio.com/us-en/contact-sales-envanio) A Comparison of Our Vacuum Pump Silencer Series ------------------------------------------------- The inlet separator-silencer must be sized to keep velocity below 5,500 ft/min at all operating phases, with a nozzle sized for the required flow rate. The discharge separator-silencer should be selected based on pressure drop. To help you select the right silencer type and size to meet your requirements, Envanio Universal offers an extensive line of vacuum pump silencer models. ![RWVS/UWVS](https://www.envanio.com/fileadmin/_processed_/6/7/csm_Envanio_Universal_Vacuum_Pump_Silencer_RWVS_e941f4b0a9.webp "RWVS/UWVS") ### RWVS/UWVS Inlet Liquid Separator-Silencers The RWVS and low-profile UWVS models provide corrosion protection for vacuum pumps by removing most of the process liquid before entering the vacuum pump. These separators are best suited for full vacuum conditions under critical applications which require inlet silencing. - Pressure Drop Coefficient of 4.0 C - Separation Efficiency of 99% - Liquid flow from 15 to 1,200 GPM depending on drain size [ Get a free consultation ](https://www.envanio.com/us-en/contact-sales-envanio)

RWSI/UWSI

Inlet Liquid Separator-Silencers

The RWSI and low profile UWSI models provide corrosion protection for vacuum pumps by removing most of the process liquid before entering the vacuum pump. These separators are best suited for full vacuum conditions under critical applications, which require inlet silencing. RWSI models have a unique profile and larger pipe sizes than the RWVS series.

Pressure Drop Coefficient of 3.0 C
Separation Efficiency of 90%
Liquid flow from 15 to 1,200 GPM depending on drain size

Get a free consultation

RVCS/UVCS

Discharge Liquid Separator-Silencers

The RVCS and low profile UVCS models provide high-performance liquid separation and noise attenuation. When an inlet separator is not installed, the discharge separator may need to be oversized. For pipe sizes 1" to 3", the models use a pipe thread connection for the vertical liquid outlet.

Pressure Drop Coefficient of 4.0 C
Separation Efficiency of 99%
Liquid flow from 10 to 1,000 GPM depending on drain size

Get a free consultation

RVRS/UVRS

Discharge Liquid Separator-Silencers

The RVCS and low profile UVCS models provide high-performance liquid separation and a better noise attenuation than the RVCS and UVCS models. For pipe sizes 1" to 3", the models use a pipe thread connection for the side liquid outlet.

Pressure Drop Coefficient of 4.5 C
Separation Efficiency of > 99%
Liquid flow from 10 to 1,000 GPM depending on drain size

Get a free consultation

Inlet (vacuum) of Liquid Sealed Vacuum Pumps
Discharge (atmospheric) of Liquid Sealed Vacuum Pumps

Envanio Universal designs and manufactures vacuum pump silencers for effective liquid separation and high-performance noise attenuation. Thanks to the different models, our vacuum pump silencers are suitable for a wide range of industries.

When a vacuum pump starts operating at normal atmospheric pressure, system pressure drop and power requirements are at their maximum. As the vacuum pump continues to evacuate the system, the inlet pressure decreases so the system pressure losses and power requirements decrease. The inlet volume flow in actual cubic feet per minute (ACFM) stays essentially constant throughout system operation, but because of decreasing inlet pressure, the discharge volume decreases until normal operating conditions are reached.

Envanio Universal designs and manufactures blower silencers in a wide range of standard sizes and configurations to meet diverse application needs. Engineered for global compatibility, they are available with most common pipe connection styles, including threaded, slip-fit, and flanged connections (ANSI, JIS, DIN, and more). Additional flexibility is provided through multiple mounting configurations, enabling seamless integration into virtually any blower package system design. ASME Code-compliant construction is also offered.

Separator-silencers meet their rated liquid separation efficiency at a nozzle velocity of 5,500 ft/min. At lower velocities their performance improves. At higher velocities their efficiency decreases. The nozzle velocity is the air velocity in the inlet or discharge nozzle and is equal to the actual volume flow rate (ACFM) divided by the nozzle area. Since the inlet volume flow rate is nearly constant during normal vacuum pump operation, the inlet separator-silencer should be sized so the velocity does not exceed 5,500 ft/min during all phases of operation. The discharge flow rate decreases from startup to normal operation, and in some applications, it may be acceptable to exceed a velocity of 5,500 ft/min during startup. If it is not acceptable to discharge liquid during startup, the velocity must be reduced.

If some liquid bypass is allowed during startup, the selection of the discharge separator-silencer should be based on pressure drop. Inlet and discharge separator-silencers require drain systems to remove the liquid. These systems (both inlet and discharge) must provide an adequate drain sealing system or liquid level to offset the vacuum on the inlet side and prevent blowout on the discharge side. See Tables 2 and 3 on the following page for liquid removal data.

To meet individual customer requirements and varying operating conditions, Envanio Universal offers a wide range of standard or custom-built industrial silencers.

All Products

Engine Exhaust Silencers

Attenuate noise generated by your diesel and natural gas applications with Envanio Universal’s comprehensive line of high-performance primary and secondary engine exhaust silencers.

View Product

Absorptive Silencers

Attenuate the mid- and high-frequency noise generated by your high-speed centrifugal blowers, fans and compressors with Envanio Universal’s comprehensive line of absorptive silencers.

View Product

Blower Silencers

Attenuate noise and pressure pulsations generated by your centrifugal, positive displacement, helicoil, and two- or tri-lobe blowers with Envanio Universal’s comprehensive line of blower silencers.

View Product

Vent Silencers

Attenuate noise generated by high-velocity air, steam, and gas venting applications as well as blowdowns to atmospheres under sonic or critical flow conditions at the valve with Envanio Universal’s vent and blowdown silencers.

View Product

ASME Code Silencers

Designed and manufactured to meet ASME standards for applications with vacuum exceeding 20 inches of mercury, our ASME code silencers handle operating pressures ranging from 15 to 3,000 PSIG and deal with hazardous or flammable gases.

View Product

Please contact us directly to schedule a personal consultation or submit your project details using our contact form to receive a complementary, no-obligation quote.

James Mitchell

Director Sales and Business Development

+1-608-630-6338 james.mitchell@envanio.com

Get in Touch

RWSI/UWSI

RVCS/UVCS

RVRS/UVRS

Typical Applications for Vacuum Pump Silencers

Typical Industries to Apply Vacuum Pump Silencers

FAQ

More Industrial Silencers

Engine Exhaust Silencers

Absorptive Silencers

Blower Silencers

Vent Silencers

ASME Code Silencers

Let's Talk

RWSI/UWSI

RVCS/UVCS

RVRS/UVRS

How do vacuum pumps operate?

How are vacuum pump capacities at operating conditions expressed?

When do separator-silencers hit their rated liquid separation efficiency?

How does the allowance of liquid bypass during startup affect the selection of the discharge separator-silencer?

Engine Exhaust Silencers

Absorptive Silencers

Blower Silencers

Vent Silencers

ASME Code Silencers