A slender oil pipe with many elbows and not fixed could cause the pipe to shake when the oil flow rate is high. An unbalanced rotating part of the motor and hydraulic pump, poor alignment during installation, or loose coupling can generate vibration and noise.
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[pdf] Install the valve with proper positioning of the flow arrow. Support and align adjacent piping and the vale. Install lubricated flange bolts. Hands tighten, and then torque the bolts using the crossover flange bolt-tightening method to load the bolts evenly, and eliminate concentrated stresses.
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