HYDROPOWER – SEALING SOLUTIONS
For Turbines and Valves
American High Performance Seals offers the hydropower industry technologically advanced sealing solutions that overcome the shortfalls that have been experienced with traditional rubber seals. These seals incorporate:
- Advanced high-performance thermoplastic sealing materials that have as much as five times the wear and abrasion resistance of traditional rubber elastomers.
- Optimized seal lip geometry designed for a precisely controlled sealing contact between seal lip and mating sealing surface over the lifetime of the seal reducing wear and extending seal life.
These seals have been developed in collaboration with Seal Maker® of Austria and are used worldwide by major OEMs and power plant operators for new installations or as upgrade replacement seals.
Guide Vane Seals for Kaplan and Francis Turbines
Guide vanes can be found in Kaplan turbines as well as in Francis turbines. Their main function is to convert the pressure energy of the water into momentum energy. They also direct the water flow at the optimum angles to the runner blades. Only slow pivoting movement is taking place.
A trouble-free operation of the guide vanes is essential to ensure optimum performance of the turbine; therefore, the proper sealing system is a key factor. Usually, approximately 20 guide vanes per turbine can be found; however, this number depends on size, design and other factors.
Guide Vane – Verbund ©
The pivoting and vibrating motion that guide vane seals experience calls for uni-directional seals. Our seals are specifically designed and optimized for this application.
Sealing profiles for guide vanes:
Kaplan Rotor Blade Seals
Movable rotor blades can only be found in Kaplan turbines. Typically, there are 3-8 rotor blades on a Kaplan turbine with a trunnion diameter to be sealed from approximately 300mm to 1500mm.
In order to ensure a smooth and efficient operation, a well-coordinated sealing system is required. Increasingly stricter environmental regulations also call for an increasingly improved sealing system.
Kaplan Rotor Blade seals have the dual function of ensuring zero leakage of the oil and zero entrance of the water into the turbine. This means the seals must be both oil and water compatible and able to perform the dual sealing function in the smaller irregular installation spaces. Our optimized, double-acting rotor blade seals are designed to fit in new or pre-existing seal housings and are available within 1-3 weeks.
Sealing profiles for Kaplan Rotor Blades:
Seals for Spherical Valve
Typically, spherical valves are used as turbine inlet and pump valves for higher design pressures (up to 200 bar, 2900psi). The mobile ring is thereby operated by oil and/or water pressure. The sealing system on the mobile ring as well as on the trunnion is most important to ensure the proper functioning of the valve. The valve diameter can be up to approx. 8 Meter.
Seals for spherical valves face numerous challenges. The seals must be able to compensate for some large deformations and misalignments of the mobile rings; yet, at the same time, fit in small installation spaces, retain dimensional stability under pressure and resist twisting during seal installation. We offer several optimized seal designs to accomplish this challenging task.
Seals for Butterfly Valve
Butterfly valves are primarily used as safety valves, turbine inlet and pump valves for low to medium design pressures (up to 65 bar).
In this regard, the seal is installed directly onto the valve flap. Depending on the butterfly design (trunnion in the center or trunnion off-center), we provide seal designs both endless or split depending on the application or customer needs.
Butterfly valve seals must be of compact design, yet retain high dimensional stability under pressure, and resist twisting during both installation and operation. Our seals are specifically designed for this application.
Contact us (link to contact us) to request more information or call 1-800-283-7140 for immediate answers to your questions.
American High Performance Seals assumes no obligation or liability for any advice furnished or results obtained with respect to these products. All such advice is given and accepted at the buyer’s risk.
This information, based on our experience, is offered as part of our service to customers. It is intended for use by persons having technical skill, at their own discretion and risk. We do not guarantee favorable results, and we assume no liability in connection with its use.
Any purchases resulting from information provided by American High Performance Seals, Inc., including proposals, recommendations and quotes, are subject to “AHPSEALS TERMS AND CONDITIONS OF SALE.”