What We Do

We manufacture our own complete line of Cartridge, Assembly style Mechanical Seals for Industrial Pumps, Compressors, Mixers, Agitators, Reactors and Beadmill units.

We can repair / replace all makes & models of Mechanical Seals used on Pumps / Compressors / Mixers / Agitators / Reactors & Beadmill units. Custom Design / Manufacture Mechanical Seals for any application to increase run cycles. Provide Fluid Sealing Solutions for all industries.

We also provide Custom Engineered parts made from Tungsten Carbide, Silicon Carbide, Ceramic – for use in Shaft Steady Bushings / Wear Plates and many other industrial applications.

A tire sealant manufacturing company in Texas sent this Lightnin mixer unit in for overhaul. The GEARBOX was leaking oil into the mixing tank contaminating the batch production. Upon inspection we found the BEARINGS had failed causing the LIP SEALS to fail. All new bearings & lip seals installed, o’rings replaced and the rotary shaft was polished on the lip seal surfaces.

An adhesive manufacturer in Houston, Texas sent this Viking K8124A magnetic pump in for overhaul. It had seized up. All bearings, lip seals and o’rings were replaced. Pump was re-assembled and pressure tested to 60 PSIG.

A chemical plant in New Mexico sent this 120mm Nippon Pillar seal into our Texas repair facility for overhaul. Seal had Tungsten Carbide vs Tungsten Carbide on inboard end and Carbon Graphite vs Tungsten Carbide on outer end.

The outer stationary Carbon Graphite seal face was chipped out and cracked. The (3) Tungsten faces required clean up & relap flat within 2 Helium light bands. We machined a new Carbon Graphite seal face in house.

All the metal parts required clean up & polish on o’ring sealing surfaces. One of the wavesprings was damaged and required replacing. Robco of America had a new wavespring manufactured to our specifications to supply adequate seal face pressure. Seal was re-assembled & passed our 60 PSIG pressure test. Seal is back in operation.

A chemical batch processing plant in Oklahoma sent this 110mm Burgmann double mixer seal in to our Texas repair facility for inspection & overhaul.

Upon inspection we found the two rotary Carbon Graphite seal faces were worn and the two stationary Silicon Carbide seats were chipped & cracked.

A pump repair company in Illinois sent these two 3.00″ Cartridge seals in to our repair facility for emergency overhaul. They had Carbon stationary seal faces running against rotary Silicon Carbide seats.

They had wave springs behind the stationary Carbon seal faces and Viton o’rings. The Carbon seal faces were severely worn and required replacement. We machined new Carbon seal faces in house. The Silicon Carbide seats were re-ground & lapped flat within 2 helium light bands. New wavesprings, Viton o’rings, setscrews, setsclips and drive pins installed.

All metal parts were re-machined and polished on o’ring sealing surfaces. These seals were re-assembled and pressure tested to 60 psig for 10 min. with no loss of pressure. Repair job was turned around in two working days due to customer losing production.

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A company in Italy contacted Robco of America in regards to designing & manufacturing some Silicon Carbide wearplates for an industrial centrifuge application. Customer wanted a Hastalloy outer band press fitted onto the wear plates.

We were able to turn the job around in 2 weeks due to customer deadline.

A chemical plant in Louisiana sent a 2.00″ Chemineer (model HTN) double mixer seal in for failure analysis and repair. Upon inspection we found the product side stationary Silicon Carbide seat had cracked and chipped out causing the barrier fluid to leak into the mixing tank. Silicon Carbide seats are prone to chipping out and cracking in the area where they engage an anti rotation pin.

We made the recommendation to change out for a Tungsten Carbide seat after confirming the product would not physically attack the Tungsten material. Tungsten Carbide will not chip out or fracture due to pin engagement. We machined new Carbon Graphite rotary seal faces and swapped out the outboard end stationary Silicon seat for a Tungsten Carbide seat. All o’ring sealing surfaces were polished and we installed a new bearing and lip seals. The seal was re-assembled and pressure tested to 60psig for 15min. with no pressure drop. The Chemineer HTN seal has been back in operation for 9 months.

A chemical plant in Alabama sent a 95mm Netzsch double Beadmill seal in for overhaul. It was in extremely poor condition. We had a new product side wear plate made from solid Tungsten Carbide to replace the old Chrome coated plate. Both rotary coated seats were replaced with solid Tungsten Carbide seats.

A new product side stationary Tungsten Carbide seal face installed. On the outer end we machined a new Carbon Graphite stationary seal face. A new rotary seal sleeve was made. The Netzsch double seal uses two end caps that are installed around the Netzsch seal we replaced both of them, machined from 316 Stainless. The seal was re-assembled & pressure tested to 80 psig for 15 min, no pressure drop.

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A pump company in Houston, Texas wanted a custom designed / manufactured cartridge seal to install in a vertical pump for a municipal water district. They were having issues with the original seals failing prematurely due to the pump shaft steady bushings wearing out too quickly.

We designed a cartridge seal that had a heavy duty built in shaft steady bushing machined from a metallized carbon graphite with built in internal channels to help increase fluid through around the bushing. This seal has been running for 5 years , the original seals were failing after 4-6 months. All the pumps in this municipal district have been overhauled and have the Robco designed seals installed.

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A company in the Middle East contacted Robco of America to see if we could fix some issues with a set of Pratt & Whitney turbine bearing seal assemblies. End user was having issues with the quality of work being carried out at a repair facility in Europe.

We designed custom lapping equipment to rework the Carbon seal rings and meet the required tolerances. The turbine bearing seal assemblies were shipped back to the Middle East and are now in operation. End user informed Robco of America they will send all future assemblies to us for overhaul.

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Chemical processing plant in Puerto Rico sent this 95mm double reactor seal with lower glass lined flange in for overhaul. It has Kalrez o’rings for the high operating temps. (440 deg. F.) Tungsten Carbide vs Silicon Carbide on product side. Carbon Graphite vs Tungsten on outer end. Reason for seal failure was the worn lower shaft steady bushing in the bottom of the 20,000 Gal. tank.

This allowed the shaft to rotate outside of allowable radial tolerances. We replaced the seal faces and seats. Machined a new double walled seal housing which allows for the addition of cooling fluids to control temps. in the seal, installed new Kalrez o’rings. Mechanical Seal was re-assembled and pressure tested to 80psig for 15 min, no pressure drop.

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80mm Netzsch Double Mill Seal sent in for overhaul from chemical plant in Kentucky. This unit had Silicon Carbide vs Silicon Carbide on both the product side and the outer end. The Silicon Carbide seal faces & seats were chipped / cracked around the drive pin slots. We advised the customer to upgrade material of construction to Tungsten Carbide which is less prone to chipping / cracking. The end user agreed and we had new seal faces and seats manufactured. Seal was repaired and pressure tested to 80 PSIG. Unit is now back in operation.

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3.00″ Double Mixer Seal sent in for emergency repair from chemical plant in Pasadena Texas. Rotary Silicon Carbide seal faces were worn & chipped out. Stationary product end Silicon Carbide seat was worn and chipped. Rotary seal sleeve was worn and pitted on o’ring sealing surfaces, new sleeve required. This seal has Kalrez o’rings on product end due to elevated operating temps. (+400F). Robco of America had a repair kit on the shelf for this emergency overhaul. Seal was turned around in (2) working days.

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Chemical plant in North Carolina sent a failed 100mm Double Mixer Seal in for replacement. We reverse engineered and provided a replacement mechanical seal unit. We upgraded the product side seal faces to Tungsten vs Silicon from original Silicon vs Carbon. Seal has been back in operation for 2 yrs.

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Robco manufactured a new 4.00″ double seal unit and reverse engineered the worn out lower shaft steady bushing assembly. Robco oversaw the installation of both the seal & bushing unit.