Rotary Mechanical Shaft Seals

Engineered Sealing Solutions - Robco of America, since 1923, has provided excellent alternatives to OEM products along with reliable Fluid Sealing Solutions to U.S. industries. Robco manufactures and repairs cartridge and assembly seals for Pumps, Mixers, Agitators and Bead Mills including Lightnin Mixers nationally and internationally. Robco's Mechanical Seals, Mechanical Packing and Gaskets perform optimally in the harshest of environments.
Mechanical Seals

At Robco of Amercia we provide pick-up and delivery services to customers located in Houston, Baytown, Deer Park, Galveston, Pasadena, the Port of Houston and surrounding areas. If OEM says part is obsolete then send it in to Robco for repair. Every repair we carry out includes a complete failure report with digital images. Call us right now for more information: 1-800-662-0585. Robco is available 24/7.

Robco has been the exclusive manufacturer of the Nutech line of cartridge mechanical seals for Dixie Packing and Seal Company in Nashville TN.

Reactor, Agitator, Mixer & Screw Pump Seals

Robco will service & overhaul all makes and models of Reactors, Mixers or Agitator seals including but not limited to: Lightnin, Netsch, Chemineer & Philiadelphia Robco will provide a detailed DCI {disassemble, clean, inspect} report with pictures before any repair work is authorized by our customer. We will make recommendations on materials of construction and bearings to significantly increase your unit run cycles. All new or repaired seals are pressured tested in house prior to shipment.
Reactor, Agitator, Mixer & Screw Pump Seals

Pump Seals

Robco will manufacture an assembly style or cartridge style mechanical seal to fit your pumping system be it centrifugal, positive displacement, progressive cavity, or a sanitary pump. Horizontal, vertical, end suction, split case or volute style. Robco will seal it. Quickly and efficiently.
Pump Seals


We can repair any make or style of Mechanical Seal. Robco's staff thoroughly inspect all repairable seals and will provide inspection reports with pictures when requested. Is it time to convert from packing to a Mechanical Seal? Save up to 30% amprage draw on your motor.
Mechanical Seal Repair

Custom Design

Robco custom builds extremely reliable Mechanical Seals that can dramatically increase the operating hours of your rotating equipment. Our top notch Application Engineering Group designs Mechanical Seals to your specific requirements. Our Seals are manufactured, assembled and tested in America.
Custom Mechanical Seal Solutions

Custom Engineering

Use Robco engineered critical components to increase your system MTBF {meantime between failures} for your pumps, mixers, dryers, compressors, centrifuges, agitators, beadmills, boiler feed water systems, sanitary systems, potable or treated water systems.
Custom Engineering Solutions

Robco services a wide range of industries with engineered sealing solutions. Click on industry below for more information.

Contact Robco of America to request more information or call direct: 1-800-662-0585 if you need emergency mechanical seal repair.

Emergency Repair

Emergency Repair Example

150 double Bead Mill Seal sent to Robco repair facility for failure analysis and repair. Seal unit failed due to rupture of the product side rubber wear plate which allowed the product beads to migrate into interior portions of the seal unit causing wear to the seal sleeve.

The unit required a new rubber coated stainless wear plate to be fabricated as well as a new seal sleeve. A full repair kit was installed which includes Tungsten Carbide seal faces and seats, new springs, Teflon sealing wedge and lip seals.

The unit was re-assembled and pressure tested to 80 psi. Seal unit is back in service.


3.00” Mixerpac double agitator seal to be repaired

Repaired and Tested

Agitator seal repaired & tested


Netzsch double mixer seal to be repaired

Repair and Tested

Netzsch double mixer seal repaired & tested


1.50” EV01 cartridge seals with thin glands for confined space on pump


3.75” double cartridge seals for Moyno pumps

High Pressure

Type 8B high pressure rotary seal


3.00” EV06 multi spring cartridge seal for 2000 psi pump