Boiler Feedwater Pump Balanced Tube Low Pressure

Boiler feed pump balance tube role:
        The balance tube is from the outlet seal ring of the pump, which leads to the inlet end of the pump, which is called the balance tube. Its main role is to balance the axial thrust pump to reduce the axial movement of the rotor to prevent the impeller and the shell friction.welcome to apk buy Boiler Feed water Pumps
When the boiler feed pump is in operation, the impeller outlet discharges the high pressure liquid, and the part flows to the impeller, so that the pressure behind the impeller is basically the same as the outlet, and the front side of the leaf transmission line is the suction end, the pressure is very low. In this way, the impeller on both sides of a larger pressure difference, will produce a point to the pump inlet and axis parallel to the axial thrust, so that the entire rotor pressure to the suction side, serious impeller and pump casing friction or impact, affecting the pump The safe operation, it must try to be balanced.
Balanced axial thrust of many ways, such as the use of double suction impeller or symmetrical arrangement of impeller (multi-stage pump), the use of balance hole, balance plate, balance drum and so on. The balance tube is only one way to balance the axial thrust, which is the pressure liquid behind the impeller, with the balance pipe to the inlet side, so that the pressure on both sides of the impeller balance. This method is simple, but can not fully balance the axial thrust, the remaining axial thrust, need to be set by the thrust bearing to bear.
        Simple understanding of the balance plate The principle and the thrust bearing on the turbine similar to the balance tube and the thrust bearing on the role of the return pipe similar.
      Boiler Feedwater Pump Balanced Tube Low Pressure Reason:
        1, since it is balanced tube, that balance tube pressure should not change too much, or is blocked or missed.
        2, the balance tube used to eliminate the axial thrust, the pump outlet valve closed or behind the block, the balance pipe pressure is high; pump exhaust when the balance pipe pressure is low, the normal pressure remains unchanged.
        3, high-pressure feed water pumps balance pipe pressure slightly higher than the inlet pressure, if the pressure increases, indicating that the balance between the drum and the balance between the drum sets larger, if the pressure reached 2-3 times the inlet pressure, the best disintegration check.