US 12,449,053 B2
Foot valve assembly and submerged pump system
Yasuo Tomita, Tokyo (JP); Motoyasu Ogawa, Tokyo (JP); and Masaaki Eguchi, Saitama (JP)
Assigned to NIKKISO CO., LTD., Tokyo (JP)
Filed by NIKKISO CO., LTD., Tokyo (JP)
Filed on Jan. 20, 2023, as Appl. No. 18/157,291.
Claims priority of application No. 2022-025665 (JP), filed on Feb. 22, 2022.
Prior Publication US 2023/0265933 A1, Aug. 24, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. F16K 17/36 (2006.01); F16K 24/06 (2006.01); F17C 13/04 (2006.01)
CPC F16K 17/36 (2013.01) [F16K 24/06 (2013.01); F17C 13/04 (2013.01); F17C 2205/0323 (2013.01); F17C 2221/01 (2013.01); F17C 2221/033 (2013.01); F17C 2227/0135 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A foot valve assembly, comprising:
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 cylindrical adapter configured to accommodate a suction port of the pump;
a valve disc configured to open and close a lower opening of the cylindrical adapter corresponding to raising and lowering of the pump;
a biasing member that biases the valve disc toward the cylindrical 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 the handling liquid is allowed through the auxiliary valve before opening the valve disc, wherein
the valve disc includes a communication hole that penetrates the valve disc in a vertical direction,
the auxiliary valve includes an auxiliary valve disc that is configured to open and close the communication hole,
wherein, when the auxiliary valve disc is open, the auxiliary valve disc is disposed below the valve disc
and spaced apart from the valve disc,
the communication hole communicates with an internal space that is surrounded by the cylindrical adapter and the valve disc and with an external space around the cylindrical adapter and the valve disc, thereby allowing the handling liquid to flow into the internal space, and
wherein, when the auxiliary valve disc closed,
the auxiliary valve disc is liquid-tightly brought into contact with a lower surface of the valve disc, thereby separating the internal space from the external space.