Significantly contributes to the reduction of regular inspections, ensuring the safety of workers, and maintaining the integrity of bolts.
The bolt heater utilizing high-frequency induction heating performs the opening and closing (tightening and loosening) of hole bolts in turbine chambers, valves, flanges, pressure vessels, water turbines, rolling machines, etc., quickly and safely without damaging the bolts. The input power is set to ensure that the temperature difference between the inside and outside of the bolt does not exceed the allowable stress (Patent No. 03396344), and the structure of the heating coil, consisting of a reciprocating conductor in a semi-circular shape, provides high heating efficiency (Patent No. 2882962). Additionally, interference from objects such as the upper part of the bolt can be avoided with flexible heating coils. This significantly contributes to reducing regular inspection times, ensuring worker safety, and maintaining the integrity of the bolts. Kyokuto Sangyo Co., Ltd. offers equipment rental and dispatches technical instructors. 【Features】 - Short heating time, greatly reducing the time required for bolt tightening and loosening operations - Early detection of unexpected main engine malfunctions due to early release - Reduction of power plant downtime - Improvement of operational efficiency - Reduction of assembly and disassembly labor costs For more details, please contact us or download the catalog.
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basic information
【Features】 ○ Rapid heating allows for minimal thermal expansion of the flange, enabling high-precision tightening. ○ Water-cooled design prevents temperature rise, eliminating the risk of burns. ○ Easy to operate, with only the bolt elongating, allowing for tightening and loosening with light force. ○ Suitable for small-diameter bolts with a heating hole inner diameter of 10mm or more, and applicable to long and very short bolts. ○ Areas that do not require heating, such as threaded sections and embedded parts, are not heated. ○ Can be directly applied to existing bolts. ● For more details, please contact us or download the catalog.
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Applications/Examples of results
【Applications】 ○ Casing bolts for steam and gas turbine chambers (high pressure, medium pressure, low pressure) ○ High pressure main steam pipe (MS) bolts ○ Blade ring (BR) bolts (high pressure, medium pressure, low pressure) ○ High pressure packing head (PH) bolts ○ Control valve (CV), main steam stop valve (MSV), low pressure bypass valve (LPBV), reheat combined valve (CRV, ICV) ● For more details, please contact us or download the catalog.
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Company information
On the occasion of our 60th anniversary, we changed our company name from Kyokuto Sangyo Co., Ltd. to Bridges Co., Ltd. on March 1, 2020. No matter how times change, we wish to leave behind a beautiful natural environment for the next generation. To achieve this, we are a company that fulfills its responsibility to supply excellent products in harmony with the environment, even if it means creating new ones if they do not exist in the world. We are a company that improves production processes and contributes to environmental conservation as a result. We will continue to walk the path of an engineering trading company with dreams, hopes, and pride.