The guide vanes control the inflow of water in turbines. These vanes run in sliding bearings. To give the bearings longer term protection from water infiltration, the inner sealing MANOY® system seal WP, type 428, was developed for standard specifications. Type 487 with integral scraper was designed for high specifications due to abrasive constituents in the water and/or long inspection intervals. The housing for this seal must be open. The profile dimensions of both versions can be customized to adapt to existing groove designs.
Germany
Servo motors in hydropower plants normally operate water hydraulically. These servo motors perform the functions of opening, closing and control of shutoff and regulating devices and must be able to maintain the setting position at any prevailing pressure.
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Kaplan turbines are typically used for river power plants on calm waters. The blade angle runner blades (Kaplan blades) is adjustable. The pressure of the water flow, which is controlled by the guide vanes of the upstream wicker gate, can then be efficiently converted into energy. The bidirectional MANOY® system seal WP, type 444, in the form of a continuous ring was developed to protect the hydraulic adjustment device and prevent hydraulic fluid leakage. Type 449 is particularly useful for maintenance work because rather than being continuous in circumference, the seal is open and has a guide blade.
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Penstocks are used to discharge the headwater from a reservoir. Due to thermal and dynamic effects on the pipelines which are usually run underground in the mountain, compensation for expansion is necessary. By fitting an expansion joint, slow creep movements, eccentricity, dilation and also pipe misalignment can be reliably absorbed. The MANOY® system seal WP, type 436, was specially developed for leakagefree operation of an expansion joint.
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Spherical valves are installed upstream of the turbine as shutoff devices specifically for high pressures at the end of the penstock. Their main function is to close off the penstock during normal shutdown or load shedding of the turbine. The seal is a metal sliding ring which is generally moved by water hydraulics. The MANOY® system seal WP, type 434 (outer sealing) and the inner sealing type 439, were developed for sealing of the sliding ring. The profile dimensions can be customized for maintenance or specific requirements.
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