When rotating equipment fails, the culprit is very often the seal. Pumps, agitators, mixers, and reactors all depend on one small but critical component to keep process fluids in and contaminants out. That is exactly the problem Sumika Seals Pvt. Ltd. has been solving since 1997.
Introduction to Sumika Seals
Sumika Seals Pvt. Ltd. is a trusted Indian manufacturer and exporter of high-quality mechanical seals, seal support systems, and complete sealing solutions. For nearly three decades, the company has served some of the most demanding industries in the world, including oil & gas, chemical processing, pharmaceuticals, power generation, food processing, and water & wastewater treatment.
What sets Sumika apart is its combination of experience and forward thinking. The company is managed by a team of seasoned professionals with a clear mission: to stay abreast of the latest technological innovations in India and worldwide, so its clients always get sealing products that reflect current best practices.
Quality is not an afterthought either – Sumika operates in strict accordance with domestic and international standardisation (ISO 9001:2008), ensuring reliable, precision-engineered products every time.
Spotlight: The Double 51U/51U Agitator Seal
Among Sumika’s flagship products is the Agitator Seal – Double 51U/51U, a double mechanical seal arrangement purpose-built for agitators, mixers, reactors, vessels, and autoclaves. It is the go-to choice for applications requiring enhanced sealing safety and controlled barrier fluid arrangements – think reactive chemistry, hazardous media, or processes where leakage simply is not an option.
Key Design Features
- Top entry drive arrangement, ideal for top-mounted agitators
- Cartridge construction, which dramatically simplifies installation and reduces fitting errors
- Rotation-independent design – it performs the same regardless of the direction of rotation
- Optional designs available to match specific pressure levels
- Can be supplied with a reverse pressure balance single seal arrangement
Materials Built for Harsh Service
Seal performance ultimately comes down to materials, and Sumika offers a comprehensive selection:
- Seal faces: Carbon or Silicon Carbide for the rotary face; Ceramic, Silicon Carbide, Tungsten Carbide, or Stellite for the stationary face
- Hardware: Retainers, springs, thrust rings, snap rings, and grub screws in SS316 or special alloys
- Secondary seals: For 51U/51B, wedge/stationary packing in PTFE, glass-filled PTFE, or graphite – ensuring reliable service in high-temperature and chemical applications. For 52U/52B/52BS, O-rings in Viton, EPR, Buna-N, Neoprene, FEP, or Kalrez. O-rings reduce shaft fretting thanks to their flex-and-roll flexibility and are preferred wherever an elastomer suits the process fluid.
Temperature capability spans an impressive range depending on the secondary sealing material – from cryogenic-adjacent duties around -50°C (glass-filled PTFE) up to 400°C with graphite.
A Full Range for Every Application
The 51U/51U is just one part of a broad portfolio. Sumika supports a wide variety of seal types, each engineered for a specific class of service:
- Type 11 – Teflon Bellow Seal: For corrosive and chemical duties where metallic contact with the process fluid must be minimized – perfect for pumps handling acids, alkalis, and aggressive liquids
- Type 51U/51B & 52U/52B: Multi-spring seals for general industrial duties, handling clear, non-corrosive, and corrosive liquids depending on material selection
- Type 21U/21B & 22U/22B: Single-coil spring seals for slurry, viscous, and abrasive liquids, with a clog-resistant design
- Type 7 SP: A single-coil open-type seal for slurry and abrasive services with suspended particles
- Type 9: A heavy-duty single-coil seal for demanding abrasive, viscous, and slurry applications
- Type 77 – Elastomer Bellow Seal: A compact option for water, light chemical, and general utility pumps where simple installation matters
- Type 52BS: A balanced seal for higher pressures and demanding slurry or viscous services
- Type 111: An externally spring-loaded stationary seal for crystallizing, slurry, and high-speed duties
- Agitator Seal – Single 52BS: A single agitator seal for top-entry mixers and vessels in chemical and pharmaceutical processing
The Bottom Line
Whether you are sealing a top-entry reactor agitator in a pharma plant or a slurry pump in wastewater treatment, Sumika Seals offers a precision-engineered solution backed by nearly 30 years of expertise.
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