First, the start of the three screw pump.
The three-screw pump should be started when the suction stop valve is fully open in case of overload or suction.
The three-screw pump has dry absorbing ability, but must prevent dry turn, so as to avoid the scratch work surface.
If the pump need to be in the oil temperature is low or high viscosity under the condition of starting, suction exhaust valve and bypass valve should be fully open under the condition of starting, let the minimum load when the pump starts, until the prime mover to the rated speed, then bypass valve shut down gradually.
When the bypass valve opens, the liquid is in the case of a throttle cycle flow in the pump, and the cycle of oil, the more the longer cycle, the liquid fever also becomes more serious, even make pump due to the high temperature deformation and damage, must pay attention.
Ii. The operation of the three-screw pump.
The three-screw pump must operate in a given direction to produce a certain suction and discharge.
During pump work, check the pressure, temperature and mechanical shaft seal. The shaft seal should allow for a small amount of leakage, such as no more than 20 to 30 seconds per drop, which is considered normal. If the pump produces noise at work, it is often because of the oil temperature is too low, the oil viscosity is too high, the oil in the air, the coupling loss or the pump excessive wear and other causes.
Three, three screw pump parking.
When the three-screw pump stops, the discharging stop valve should be closed first, and the suction stop valve shall be closed after the pump is completely stopped.
Three screw pump because of the large length of the working screw, the rigidity is poor, easy to cause bending, resulting in the work abnormal. The connection of shafting must be very good; It is best to carry out the work after the installation and positioning, so as to avoid the distortion caused by the pipeline. When connecting the pipe, it should be fixed independently to minimize the involvement of the pump. In addition, the spare screw, in the preservation of the best use of suspending fixed method, avoid the deformation caused by the uneven placement.