Abstract: A sealing member according to the present invention includes a head plate having a through hole and attached to an opening end of a pump column, a lift shaft penetrating the through hole and raised and lowered between a raised position and a lowered position in raising and lowering the pump, and a bellows member extending and contracting corresponding to the raising and lowering of the lift shaft. The bellows member includes a bellows tube covering an outer peripheral surface of a protruding portion of the lift shaft protruding upward from the head plate, a first attaching member disposed contiguously to an upper end of the bellows tube and attached to an upper end surface of the lift shaft, and a second attaching member disposed contiguously to a lower end of the bellows tube and attached to an upper surface of the head plate.

Abstract: Afoot valve assembly according to the present invention includes: an adapter attached to a lower opening end of a pump column configured to accommodate a pump configured to be submerged in a handling liquid, the adapter accommodating a suction port of the pump; a disc-shaped valve disc including a flow path defining surface that is located below a lower end surface of the adapter and defines an inflow path allowing the handling liquid to flow into the pump between the surfaces, the valve disc opening and closing a lower opening of the adapter; a biasing member biasing the valve disc toward the adapter; and a one-way valve disposed in the inflow path, the valve opening for fluid discharged from the lower opening depending on a pressure of the fluid and closing for the handling liquid flowing toward the lower opening when the valve disc is closed.

Abstract: A foot valve assembly according to the present invention includes: a cylindrical adapter attached to a lower opening end of a cylindrical pump column configured to accommodate a pump configured to be submerged in a handling liquid, the adapter configured to accommodate a suction port of the pump; a disc-shaped valve disc configured to open and close a lower opening of the adapter corresponding to raising and lowering of the pump; a biasing member that biases the valve disc toward the adapter; and an auxiliary valve configured to open and close corresponding to the raising and lowering of the pump and configured to assist in opening the valve disc when the valve disc is closed.

Abstract: A sealing member according to the present invention includes a head plate having a through hole and attached to an opening end of a pump column, a lift shaft penetrating the through hole and raised and lowered between a raised position and a lowered position in raising and lowering the pump, and a bellows member extending and contracting corresponding to the raising and lowering of the lift shaft. The bellows member includes a bellows tube covering an outer peripheral surface of a protruding portion of the lift shaft protruding downward from the head plate, a first attaching member disposed contiguously to a lower end of the bellows tube and attached to a protruding lower portion, and a second attaching member disposed contiguously to an upper end of the bellows tube and attached to a lower surface of the head plate.

Abstract: A sealing member according to the present invention includes a head plate having a through hole and attached to an opening end of a pump column, a lift shaft penetrating the through hole and raised and lowered between a raised position and a lowered position in raising and lowering the pump, and a bellows member extending and contracting corresponding to the raising and lowering of the lift shaft. The bellows member includes a bellows tube covering an outer peripheral surface of a protruding portion of the lift shaft protruding upward from the head plate, a first attaching member disposed contiguously to an upper end of the bellows tube and attached to an upper end surface of the lift shaft, and a second attaching member disposed contiguously to a lower end of the bellows tube and attached to an upper surface of the head plate.

Abstract: A vertically-disposed pump shaft is supported by an upward force against the pump shaft during periods of non use of the pump thereby off-loading bearings normally supportive of the shaft to prevent damage thereto when the pump is moved. Additionally, a lateral support is provided at a lower end of the pump to prevent lateral movement while permitting axial movement, thereby reducing stresses against the pump housing and other components.

Abstract: A vertically-disposed pump shaft is supported by an upward force against the pump shaft during periods of non use of the pump thereby off-loading bearings normally supportive of the shaft to prevent damage thereto when the pump is moved. Additionally, a lateral support is provided at a lower end of the pump to prevent lateral movement while permitting axial movement, thereby reducing stresses against the pump housing and other components.

Abstract: A vertically-disposed pump shaft is supported by an upward force against the pump shaft during periods of non use of the pump thereby off-loading bearings normally supportive of the shaft to prevent damage thereto when the pump is moved. Additionally, a lateral support is provided at a lower end of the pump to prevent lateral movement while permitting axial movement, thereby reducing stresses against the pump housing and other components.

Abstract: A centrifugal pump for pumping low temperature fluid includes a motor portion driving an impeller of a pump portion. The motor portion and impeller are coaxial. A pot, sealed to the pump portion, receives the low temperature fluid. The low temperature fluid contacts only the pump portion in the pot, thereby reducing the overall heat capacity of the centrifugal pump to reduce start time. A heat insulating jacket is in tight contact with the motor portion. A vent pipe extends from the pot, through the pump portion and within the heat insulating jacket, to a rear of the motor portion to increase safety and provide double-insulation to the vent pipe. The heat insulating jacket reduces the size and surface area of the centrifugal pump to resist heat flow and increase safety.

Abstract: A centrifugal pump for pumping low temperature fluid includes a motor portion driving an impeller of a pump portion. The motor portion and impeller are coaxial. A pot, sealed to the pump portion, receives the low temperature fluid. The low temperature fluid contacts only the pump portion in the pot, thereby reducing the overall heat capacity of the centrifugal pump to reduce start time. A heat insulating jacket is in tight contact with the motor portion. A vent pipe extends from the pot, through the pump portion and within the heat insulating jacket, to a rear of the motor portion to increase safety and provide double-insulation to the vent pipe. The heat insulating jacket reduces the size and surface area of the centrifugal pump to resist heat flow and increase safety.

Abstract: The present invention provides a novel diffusor for a diffusor pump. The diffusor comprises a body having a side portion and a plurality of blades placed on the side portion of the body so as to be along a flow direction of a liquid, each of the plural blades including at least one aperture so as to divided into a plurality of parts. The body has a cylindrical shape. The blade is divided into first and second parts by a single aperture. The first part of the blade has a solidity in the range from 0.75 to 1.25 when the treating liquid flows from the first part to the second part.

Abstract: The invention provides a centrifugal pump having an axial diffusor with plural blades having such a specific incident angle as to prevent appearance of revolving and stall of a treating liquid. An incident angle of the blades of the axial diffusor is selected so that the value obtained by subtracting from the blade incident angle a treating liquid incident angle is equal to or below a specific angle representative of the kind of treating liquids.