Sealing and Guiding Systems for Hydropower Equipment
28Pages

SEALING AND GUIDING SYSTEMS FOR HYDROPOWER EQUIPMENT

3 Research & Development / Quality Control Bush-bearings & wear rings in Balancing Piston Needle Stem Nozzle guide vane 14-15 Francis / Kaplan turbine Bulb group / Turbine-pump Guide vane (Wicket Gate) 16-17 Kaplan turbine / Bulb group Blade root pivot sealing & guiding 20 Butterfly / Spherical valve Stem seal Seat seal Lens seal Hydraulic Tensioning Devices 23 Downstream expansion sleeve Expansion joint seal

A TEAM COMMITTED TO THE FUTURE REPACK-S is specialised in the design, engineering and manufacturing of seals that meet the most demanding criteria and uses. Its resolutely forward-looking human resources management has been keen to put the human element at the heart of the industrial process. The diverse, mixed, closely-knit team combines enthusiasm and experience, accuracy and expertise in all the stages involved in the production of sealing systems.

EXPERTISE & INNOVATION With a Research and Development department, an Engineering Team, a dedicated Test Laboratory, a thorough Inspection and Quality Control department, REPACK-S has all the resources to provide: Equipped with state-of-the-art production machinery, our factory can handle orders for individual pieces to mid-size batches of sealing components ranging from 1.8 to 2500 mm in diameter. This gives REPACK-S unique flexibility as a key partner. A production system capable of delivering high levels of quality and reliability in compliance with the most stringent international...

RESEARCH & DEVELOPMENT QUALITY CONTROL To maximise the lifetime in service of its sealing systems, REPACK-S relentlessly test them on various dedicated test rigs capable of reproducing the harshest constraints generated in Hydropower machinery and anscillaries. These testing machnies allow the Repack-S research team to control, improve and validate the best solutions to industry-wide seal-related problems. With many years of experience in the Hydropower industry, REPACK-S is uniquely positioned to help you understand and solve premature wear and performance degradation of seals in your...

THE REVOLUTIONARY NEW ON-SITE JOINING SYSTEM FOR LARGE DIAMETER SEALS REPACK-S has created OSIS®, an innovative polyurethane (PU) injection system that enables service engineers to easily and precisely join high-performance split seals designed and manufactured specifically for Hydropower equipment. Current available technologies and techniques for joining conventional open-moulded elastomer seals (often in NBR or HNBR) have well-known limitations. With the patented OSIS® joining system, it is now possible to obtain totally homogeneous seal joints – without compromise in terms of mechanical...

PRODUCT RANGE SEALS AND SCRAPERS - Static sealing applications: O-rings, D-rings, Back-up rings, rubber moulded parts - Dynamic sealing applications: U seals,V packing, composite seals (DanaWing® - DanaFlex® - DanaGlide® - DanaStep® - DanaCap®) - Rotary applications: U-seals,V packing, composite seals - Spring energised seals : DanaFlex® - Scrapers: large range of profiles including the twin-lip metallic scraper HRWS for the harshest service conditions. BUSH-BEARINGS & WEAR RINGS IN Machined parts, guiding strip and wear rings: Advantages - Self-lubricated => no need for polluting...

GROOVE DIMENSIONS Standard dimensions: The dimensions of standard grooves and housings are defined in our various catalogues. They meet the current requirements of international standards: ISO, UE, DIN, NF, etc. Specific dimensions: We are able to adapt our different seal profiles to existing grooves and housings. Bespoke seal profiles may also be required to improve to improve the performance of existing solutions or to make seal installation easier during maintenance operations. Face Type Seal Assembly Piston Type Seal Assembly Rod Type Seal Assembly

PELTON INJECTOR BALANCING PISTON POSSIBLE SET-UP Double-acting composite seal – according to ISO 7425/1 – comprising a friction pad with multiple sealing edges and a trapezoidal shape rubber energiser. Advantages: - No oil film between chambers => no pressure loss and excellent position holding - Precise positioning - Excellent sealing even at low pressure - No random effect - Very low friction THE HIGH PERFORMANCE SOLUTION! Tried & tested materials: - Dynamic sealing pad: P24 (filled PTFE), P81 (PU), P82 (PU) or P91 (UHMW-PE) depending on surface hardness - Energiser: Low compression set...

PELTON INJECTOR ALTERNATIVE SEALING SOLUTIONS Double-acting composite seal – according to ISO 7425/1 – comprising a rectangular thermoplastic friction pad and an elastomer o-ring energiser. Advantages: - Narrow foot print - Reduced stiction effect from standstill - Low friction => low energy consumption - Excellent extrusion and abrasion resistance => well proven reliability Tried & tested materials: - Dynamic sealing pad : P81 (PU), P82 (PU) or P91 (UHMW-PE) - Energiser: Low compression set NBR or FKM 70 shores A compound Note: DanaGlide® seals can also be supplied for non-standard grooves...

HUX - type seal Single-acting seal comprising an outer jacket in polyurethane acting as a dynamic seal and housing an elastomer o-ring energiser which enables the jacket to seal even at low pressure. Advantages: - Good abrasion resistance - Asymmetrical and compact profile that can be customised to suit any groove dimensions - Able to cope with ballooning effects (as found in hydraulic cylinders undergoing severe deformation) - Easy to install and retrofit Tried & tested materials: - Jacket: P82 (PU) or P84 (PU) - O-ring energiser: Low compression set NBR or FKM 70 shores A compound Note:...

PELTON INJECTOR NEEDLE STEM POSSIBLE SET-UP TWX - type scraper Assembly comprising a thermoplastic part with multiple lips that provide the scraping function and an elastomer o-ring energiser that ensures the scraping lips remain in contact with the rod. Advantages: - High efficiency : the double scraping lip acts as a trap for abrasive particles - Hill acts as a secondary lip - Low friction => low energy consumption - Proven long term reliability Tried & tested materials: - Main part: P81 (PU), P89 (UHMW-PE) - O-ring energiser : Low compression set NBR or FKM 70 shores A compound Note: TWX...