What Flex-A-Seal does

Flexaseal Engineered Seals and Systems, LLC (Flex-A-Seal) is a US-based industrial manufacturer founded in 1983 and headquartered in Williston, Vermont, that designs and produces mechanical seals and engineered seal support systems for pumps, compressors, mixers, and other rotating equipment. The company sells a broad portfolio spanning split, single, and dual cartridge seals, edge welded metal bellows seals, dry gas seals, multi-lip cartridge seals, and slurry pump seals, alongside gland packing products, OEM replacement seals for major brands, seal support systems (lube oil systems, barrier fluid reservoirs, monitoring systems, heat exchangers, filtration), and industrial lubricants. Proprietary technology includes the FlexICE™ diamond-bond coating for seal faces and complete in-house TIG welding of edge welded metal bellows at the Vermont facility. The company is ISO 9001:2015 certified and operates four US repair locations plus a Houston, Texas operations center and a São Paulo, Brazil operational center, serving customers in over 30 countries.

The company serves nine primary industrial verticals — oil & gas, chemical processing, power generation, water and wastewater treatment, pharmaceuticals, pulp and paper, mining and minerals, marine, and food and beverage — with API 682-qualified seal families targeted at refinery and petrochemical applications. Revenue is generated primarily through hardware sales of engineered seals and support systems, supplemented by mechanical seal repair and refurbishment services at the four US repair centers and a newly developed Reliability Solutions / Predictive Maintenance offering (vibration analysis, motion amplification, thermography, oil analysis, ultrasound). All products are sold on a custom quote basis via US state-organized direct sales representatives and an international sales team, with a toll-free US number and local international phone support, indicating a sales-led enterprise go-to-market model rather than transactional e-commerce. Multi-year contract cadence and a replacement-seal business targeting incumbents such as John Crane, EagleBurgmann, Flowserve, and Flygt imply a recurring revenue component tied to the installed base of industrial rotating equipment.

Name

Flex-A-Seal

Legal name

Flexaseal Engineered Seals and Systems, LLC

Website

https://flexaseal.com

Company type

Private

Founded year

1983

Operating status

Operating

Headcount range

51–100 employees

Short description

Flex-A-Seal is a Vermont-based industrial manufacturer founded in 1983 that designs and produces mechanical seals, seal support systems, and gland packing for pumps, compressors, and mixers used in oil & gas, chemical processing, power, water, pharma, mining, and related process industries worldwide.

Ownership category

akta.pro rank

Product category

Industrial Mechanical Seals

NAICS

Gasket, Packing, and Sealing Device Manufacturing (339991), Rubber Product Manufacturing (3262), Petroleum Lubricating Oil and Grease Manufacturing (324191)

SIC

Gaskets, Packg & Sealg Devices & Rubber & Plastics Hose (3050), Adhesives & Sealants (2891)

akta.pro primary industry

Seals, Gaskets & Fluid Connectors (O-rings, packings, rotary seals, quick couplers) (IMAHAGAI)

akta.pro secondary industries

Seals, Valves & Auxiliary Components (for Pumps/Compressors) (IMAHANAH), Security Seals & Locking Devices (Cable Seals, Padlock Seals, Meter Seals) (IMALANAG)

Keywords

• Mechanical seals
• Seal support systems
• Industrial pumps
• Gland packing
• Rotating equipment

Headquarters

HQ city

Vermont

HQ country

United States

HQ region

North America

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Operations, Supply Chain, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Mechanical Seals: Design and manufacture of high-performance mechanical seals including cartridge seals, split seals, dual cartridge seals, metal bellows seals, component seals, and multi-lip seals for pumps, compressors, mixers, and other rotating equipment.
2. Seal Support Systems: Engineered seal support systems including lube oil systems, barrier fluid reservoirs, heat exchangers, filtration systems, and gas panels configured for specific application requirements.
3. OEM Replacement Seals: Replacement seals for major brands including John Crane, EagleBurgmann, Pac Seal, Flygt, Flowserve, and others. Available in standard inch and metric sizes.
4. Gland Packing Products: ViseSeal, PowerGland, Flex-A-Pak injectable packing, and Flex-A-Braid braided packing for pumps, valves, and mixers.
5. Mechanical Seal Repair Services: Repair and refurbishment services at four US repair locations for mechanical seals, mixer seals, and compressor seals.
6. Industrial Lubricants: High-performance lubricants, lube oil systems, and grease lubrication systems including Perma Star and Perma Pro product lines.

Pricing tiers

Go-to-market motion1 record

Distribution channels4 records

Marketing channels6 records

Core offering

Flexaseal designs and manufactures high-quality mechanical seals and engineered seal support systems for rotating equipment (pumps, compressors, mixers, agitators). Its core offering spans cartridge seals (single, split, dual), edge welded metal bellows seals, dry gas seals, slurry pump seals, multi-lip seals, gland packing products, and complete seal support systems (lube oil systems, barrier fluid reservoirs, heat exchangers, filtration, monitoring systems), along with repair and refurbishment services through four US repair locations. The company serves oil & gas, chemical processing, power generation, water treatment, pharmaceuticals, and other industrial sectors across more than 30 countries.

Product overview

Flex-A-Seal (Flexaseal Engineered Seals and Systems, LLC) is an industrial manufacturer offering a comprehensive portfolio of mechanical seals and engineered seal support systems. The core product lines include: Mechanical Seals (split cartridge, single cartridge, dual cartridge, edge welded metal bellows, dry gas seals, component seals, multi-lip cartridge seals, and slurry pump seals); Seal Support Systems (lube oil systems, barrier fluid reservoirs, primary seal monitoring systems, filtration, heat exchangers, and water control devices); Gland Packing Products (ViseSeal, PowerGland, Flex-A-Pak, Flex-A-Braid); OEM Replacement Seals; and Lubrication Products. The company serves oil & gas, chemical processing, power generation, water treatment, pharmaceuticals, mining, pulp & paper, and food industries with U.S.-based manufacturing and global service capabilities.

Differentiator

Problem solved

Functional benefit

Brands

• ViseSeal: Shaft stabilization and water conservation system for packing applications in rotating equipment. Includes VSP (pumps), EXV (extended), EZV (EZ Vise), and DRV (dry vise) configurations.
• PowerGland
• Flex-A-Pak
• Flex-A-Braid
• FlexICE
• ShellCool
• TurboCool
• Flex-A-Flo

Products and services

• Mechanical Seals High-performance mechanical seals for pumps, compressors, mixers, and rotating equipment, designed for demanding applications in chemical processing, oil & gas, water treatment, power generation, and pharmaceuticals.
• Vantage ANSI Mechanical Seal Product Line Advanced ANSI B73.1/B73.2 pump seals including single cartridge, welded metal bellows, dual tandem, and slurry seals with features like monolithic seal faces and modular design, with same-day shipment on most sizes and materials.
• API Oil & Gas Mechanical Seals API 682-compliant heavy-duty seals for oil, gas, and petrochemical applications including Styles 53A, 58A, 59A, 63A, 66A, 78A, 79A, 80A, 90A, CPH, FCSA, HPCSA, HPPD, HPPS, and HPPTL.
• Style HPPS Single Extreme High-Pressure Pusher Seal Single Extreme High-Pressure, High-Duty Pusher Seal designed for exceptional reliability in demanding applications such as high pressure, high-speed, and viscous services.
• RKC Slurry Pump Seal Series Heavy-duty mechanical seals for slurry pumping applications including RKCS (flushless), RKCMS (low cross-section flushless), and RKCMD (dual cartridge) configurations for mining, mineral processing, and FGD.
• Style 85 Split Cartridge Mechanical Seal World's first split cartridge mechanical seal requiring only two pieces for installation, with both sealing faces secured in cartridge halves and pressure tested before shipment.
• Single Cartridge Mechanical Seals Easy-to-install single cartridge seals including VSSS, VRSS, VRB, VSMS, SB, RS, PHB/PHS models for various industrial applications.
• Dual Cartridge Mechanical Seals Double cartridge seals providing enhanced safety and second-level protection for hazardous fluids in oil & gas, chemical processing, and industrial applications.
• Dry Gas Seals Non-contacting, gas-lubricated mechanical seals using laser-etched grooves for process pumps and high-energy rotating equipment, including Style HPGT and Style FGS models.
• Edge Welded Metal Bellows Seals U.S.-manufactured edge welded metal bellows seals operating up to 800°F, including low-temperature (40/42/45), high-temperature (60/62/64/65), cryogenic, and hermetic bellows seals.
• FlexICE™ Diamond Face Technology Advanced diamond-bond coating for silicon or tungsten carbide seal faces providing exceptional hardness (3,500-4,000 Hv), ultra-low friction (coefficient 0.025), and superior thermal conductivity for dry running and abrasive applications.
• MLC3 Multi-Lip Cartridge Seal Cartridge seal combining lip seal and mechanical seal technologies for viscous substances up to 500,000 cP, with PTFE-ML proprietary compound lips and FDA-compliant materials.
• Gland Packing Products Full line of gland packing including ViseSeal, PowerGland, Flex-A-Pak, and Flex-A-Braid for rotating equipment requiring maximum reliability and low leakage rates.
• ViseSeal Innovative thermoplastic split-bearing packing system providing shaft stabilization and water conservation with VSP, EXV, EZV, and DRV configurations for various industrial applications.
• PowerGland Spring-assisted gland system providing constant gland tension on packing, reducing repacks and manpower requirements for packed rotating equipment.
• Flex-A-Pak Injectable packing for pumps and valves using advanced chemical and fiber technology with self-lubricating properties to eliminate leakage and reduce shaft wear.
• Flex-A-Braid Braided Packing Complete line of braided packing including FAB 5000 through FAB 5160 series, directly interchangeable with industry leading manufacturers.
• Seal Support Systems Complete range of engineered seal support systems including lube oil systems, barrier fluid reservoirs, monitoring systems, filtration, heat exchangers, and gas panels configured for specific application requirements.
• MP600 Series Lube Oil Systems Circulating oil lubrication systems in dual pump or single pump design with 25-100 gallon fluid capacity reservoirs for maintaining rotating equipment bearings and seals.
• Barrier Fluid Reservoirs ASME-compliant barrier seal reservoirs including MP52 (API Plan 52/53A), MP53 (API Plan 53B/C), and ANSI LITE/PLUS series for liquid buffer/barrier fluid supply.
• Primary Seal Monitoring Systems API-compliant seal monitoring systems including MP65 (Plan 65), MP72 (Plan 72), MP75 (Plan 75), and MP76 (Plan 76) for controlling and warning of primary seal leakage.
• Flex-A-Flo Dual Seal Water Flush Control Device Thermally actuated valve system that regulates barrier fluid flow and temperature in dual seal applications to maximize water conservation and optimize the seal operating environment.
• OEM Replacement Seals Direct replacement seals for major brands including John Crane, EagleBurgmann, Flygt, and Flowserve, available in standard inch and metric sizes and materials.
• Lubrication Products High-performance industrial lubricants and grease lubrication systems including Perma Star and Perma Pro electromechanical lubrication delivery systems.
• Mechanical Seal Repair Services Repair and refurbishment services at four US repair locations for mechanical seals, mixer seals, and compressor seals.

Quantifiable outcome

• Reduced water consumption through ViseSeal and Flex-A-Flo technologies
• +3 more outcomes

Named customers1 record

Segments9 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• AESSEAL: AESSEAL is a UK-headquartered specialist in mechanical seals and seal support systems, serving similar process industries (oil & gas, chemical, water, pharmaceuticals) with a comparable direct sales and engineered-solutions model. It is a similarly-sized mid-market direct peer.
• Flowserve: Flowserve is a major manufacturer of pumps, valves, and seals including mechanical seals for oil & gas, chemical, and power applications. Like John Crane, Flowserve is listed as a brand Flexaseal offers direct OEM replacement seals for, indicating tight product overlap.
• John Crane: John Crane (Smiths Group) is the global market leader in mechanical seals and seal support systems for pumps, compressors, and rotating equipment. Flexaseal explicitly positions as an OEM replacement for John Crane, making it the closest direct competitor in cartridge, bellows, and API 682 seals.
• EagleBurgmann: EagleBurgmann (a Freudenberg company) is one of the world's largest manufacturers of mechanical seals and supply systems. It is also listed as an OEM brand Flexaseal replaces, and competes head-to-head in cartridge seals, metal bellows, and API 682 compliant offerings.
• Chesterton: A.W. Chesterton manufactures mechanical seals, packing, and industrial lubricants for pumps and rotating equipment. Its product portfolio (mechanical seals, gland packing, lubrication) substantially overlaps Flexaseal's ViseSeal, Flex-A-Braid, and lubrication product lines.

Emerging players

• KSB SE & Co. KGaA: KSB is a major pump and valve manufacturer that increasingly bundles seal support systems and aftermarket services. It is not a direct seal-only competitor but a critical adjacent player whose bundling strategy can squeeze specialists like Flexaseal.
• Sulzer Ltd. Sulzer manufactures pumps and rotating equipment and provides aftermarket seal repair and replacement services. As an OEM with growing service depth, it is a partial competitor and channel partner candidate for Flexaseal in process industry accounts.

Broad incumbents

• Trelleborg Sealing Solutions: Trelleborg is a global leader in polymer technology with a dedicated sealing solutions business serving fluid handling, oil & gas, and process industries. It is a broad incumbent in elastomeric and engineered seals with material science depth comparable to Flexaseal's portfolio.
• Greene Tweed & Co. Greene Tweed designs and manufactures high-performance seals, including custom engineered elastomer and thermoplastic components for chemical processing, oil & gas, and aerospace. It competes in advanced materials seal faces analogous to Flexaseal's FlexICE™ diamond coating.
• Garlock (Enpro): Garlock, part of Enpro Industries, is a broad industrial sealing specialist offering gaskets, compression packing, and hydraulic components. It overlaps with Flexaseal's gland packing and braided packing lines and serves similar heavy-industry end markets.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Flex-A-Seal