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By-pass Assembly And Parts

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By-pass assembly has two positions; by-pass and close. It is in by-pass position during trip operation, and circulates mud fluid in the drill string into the annular space by-passing the idle motor, so that no mud may spray out onto the platform during the trip operation. When mud flow rate and pressure reach the setting value, the valve stem moves down and closes the valve. Meanwhile, mud stream flows through the motor, and converts the pressure energy into mechanical energy. As mud flow rate is too low, or mud pump stops, and as the pressure produced is not enough to overcome the spring force and the static friction force, the spring presses the stem upward, and by-pass is in open position. In general, the cross-over subs are used in deep well, large angle well, horizontal well or when hollow rotor is selected.

By-pass Assembly And Parts

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