Rinku Engineers (India) is a leading Bellow Mechanical Seal Manufacturer in Ahmedabad, specializing in high-precision sealing solutions for industrial pumps and rotating equipment. Our Bellow Seals RE 31 & RE 41 Series are engineered to deliver reliable, leak-proof performance while minimizing maintenance and shaft wear in demanding industrial environments.
These bellow mechanical seals are designed to eliminate the need for dynamic O-rings, making them ideal for applications involving fluctuating temperatures, corrosive fluids, and continuous-duty operation.
RANGE OF OPERATION – RE 31 SERIES
| Temperature | Cryogenics to 260°C |
| Pressure | Vacuum to 200 PSI |
| Speed | Up to 1500 RPM |
| Shaft Size | 1/2″ to 4″ |
The RE 31 Series is the most commonly used bellow mechanical seal range for various rotating equipment due to its simple and proven construction. It employs a rubber bellow as a secondary sealing element, eliminating shaft fretting and ensuring excellent flexibility. These seals also offer the advantage of a single-coil spring and are available in multiple face material combinations to suit a wide range of industrial applications.
MAIN FEATURES – RE 31 SERIES
The single spring design is non-clogging and self-cleaning, making it ideal for continuous operation. The rubber bellow and spring together compensate for shaft run-out and axial movement. Its simple and compact construction allows easy handling and installation while providing long service life with practically zero or minimal maintenance.
RANGE OF OPERATION – RE 41 SERIES
| Temperature | Cryogenics to 120°C |
| Pressure | Vacuum to 75 PSI |
| Speed | Up to 4000 RPM |
| Shaft Size | 3/4″ to 3″ |
The RE 41 Series is the most robust and widely acclaimed bellow seal range for handling acids and aggressive chemical fluids. These seals are manufactured using chemically inert materials such as PTFE, GFT, Ceramic, and Hastelloy C, which come in contact with corrosive media during operation. As a result, the seals perform with excellence under oxidizing and reducing environments.
MAIN FEATURES – RE 41 SERIES
The hydraulically balanced flexible bellow design effectively accommodates shaft run-out and axial movement. These seals feature a compact design for easy installation and negligible maintenance. The multi-spring arrangement combined with the bellow provides equal pressure distribution over the seal face, ensuring perfect sealing even at high rotational speeds.
APPLICATIONS
- Chemical and Process Pumps
- Acid Transfer and Corrosive Fluid Pumps
- Industrial Rotating Equipment
- Pharmaceutical and Food Processing Units
- Paper, Textile, and Refinery Applications
Bellow Seals (RE 31 & RE 41 Series) – FAQs
A bellow seal uses a flexible rubber or metal bellow instead of a dynamic O-ring to accommodate shaft movement, eliminating shaft fretting while sealing against leakage, manufactured by Rinku Engineers in Ahmedabad.
RE 31 uses a rubber bellow for general rotating equipment up to 260 degrees Celsius, while RE 41 uses chemically inert materials such as PTFE, GFT, ceramic and Hastelloy C specifically for acids and aggressive chemicals.
It covers cryogenic temperatures up to 260 degrees Celsius, pressure from vacuum up to 200 psi, speeds up to 1500 RPM, and shaft sizes from half an inch to four inches.
It covers cryogenic temperatures up to 120 degrees Celsius, pressure from vacuum up to 75 psi, speeds up to 4000 RPM, and shaft sizes from three quarters of an inch to three inches.
Rinku Engineers manufactures both series at its facility in G.I.D.C. Vatva, Ahmedabad, Gujarat, as part of its mechanical seal range for chemical and process pumps.
Price depends on the series, shaft size and face material combination, so Rinku Engineers provides an estimated quotation once the application details are confirmed.
Yes, Rinku Engineers supplies both series directly from Ahmedabad, either fitted to AYUSH chemical pumps or as standalone replacement seals.
Yes, the RE 31 and RE 41 bellow seal series are included in the mechanical seal range Rinku Engineers exports to the Middle East, Africa and Southeast Asia.
RE 41 is built specifically for acids and aggressive chemicals using PTFE, GFT, ceramic and Hastelloy C, materials chosen to perform well in oxidizing and reducing environments that would degrade a standard rubber bellow.
RE 31 uses a single coil spring behind the rubber bellow, giving a simple, proven, non-clogging and self cleaning design suited to continuous operation on general rotating equipment.
Yes, RE 41 combines a multi spring arrangement with the flexible bellow, which distributes pressure evenly across the seal face and keeps sealing reliable even at high rotational speeds.
Chemical and process pumps, acid transfer and corrosive fluid pumps, pharmaceutical and food processing units, and paper, textile and refinery applications commonly specify RE 31 or RE 41 seals.
Because the bellow itself flexes to absorb shaft run-out and axial movement, there is no sliding dynamic O-ring rubbing against the shaft, which is what typically causes fretting wear.
Yes, share the chemical concentration, temperature and shaft size with Rinku Engineers, and the technical team will recommend RE 31 or RE 41 along with a suitable face material combination.
Yes, pharmaceutical and food processing units are listed applications for the RE 41 Series, given its chemically inert construction and reliable sealing under fluctuating conditions.
Genuine bellow assemblies, springs and seal faces are available directly from Rinku Engineers, along with fitting and material selection guidance from Ahmedabad.
Yes, its bellow design is specifically suited to applications involving fluctuating temperatures and continuous duty operation, since the flexible bellow compensates for thermal expansion and contraction.
Yes, alongside its polypropylene pump range, Rinku Engineers manufactures the RE 41 bellow seal specifically engineered for acid transfer and other aggressive chemical duties.
It covers shaft sizes from half an inch to four inches, wider than the RE 41 Series, making RE 31 suitable for a broader range of general purpose rotating equipment.
Contact Rinku Engineers at +91 98250 68004 or info@rinkuengineers.com with the shaft size, chemical and operating conditions to receive a technical recommendation and estimated quotation.
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