FLUSHING CHECK VALVE FOR WELLS Russian patent published in 2024 - IPC E21B34/10 E21B43/12 F16K15/04 F16K17/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry. Flushing check valve for wells contains two-channel bushing, lower bushing, limiting bushing, movable shaped bushing, lower and upper valve pairs. Body consists of a connecting element, an upper extension piece, a clamping coupling, a lower extension piece and a pressing coupling. Connecting element is made with a through axial hole and radial channels located in the upper part for passing the liquid flow from bottom to top through the first inclined channel of the two-channel bushing, and with the possibility of placing a bushing, a spring and a movable shaped bushing inside it. Upper extension piece is a section of the pipe for connection with the clamping coupling with the possibility of tight placement of the two-channel bushing inside it. Clamping coupling is made with possibility of tight arrangement of cup inside its lower part. Lower extension piece is made with possibility of placement inside its upper part of connecting element and spring. Pressing coupling is made with possibility of placement inside it of lower extension piece, lower bushing with bushing. Limiting bushing can be arranged inside the cup above the upper valve pair. Lower bushing is designed with the possibility of placing a bushing in it and with the possibility of placing it with the bushing in the lower extension piece and the pressing coupling. Movable shaped bushing is made with an upper protruding part providing the possibility of abutment against the lower ball, with side channels for passage of liquid flow from the bottom upwards through the first inclined channel of the two-channel bushing and with the possibility of placing on the spring and fixing the upper part of the bushing inside it. Two-channel bushing is made with output to upper and lower valve pairs.

EFFECT: increasing the reliability of the valve operation.

3 cl, 3 dwg