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Articulated arms to compensate misalignment between valves and top body.
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Pulleys block with tempered contact surfaces and mounted on cushions / rollings.
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Both pulley blocks are reinforced with high strength steel (700 Mpa).
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Clamshell design with optimal penetration that allows full loading in all the operations and completely manufactured in wear resistant steel (hardness up to 475 HBW).
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Structure validated by Finite Elements Analysis.