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Power tongs with hydraulic friction grip for speciality tubing
Power tongs with hydraulic friction grip for speciality tubing
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机译:带有液压摩擦手柄的动力钳,用于特种油管
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摘要
A power tong is disclosed having a pipe gripping device including plural jaws activated by independent expansible chamber linear motors. An air-driven hydraulic pump, whose output pressure is limited by an adjustable relief valve, supplies fluid to the jaw motors. The jaw force can thus be closely controlled, independent of tongs torque.
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