CHECK VALVE Russian patent published in 2023 - IPC E21B34/10 E21B43/12 F16K17/06 

FIELD: oil and gas industry.

SUBSTANCE: valve devices for wells equipped with downhole pumps that can be used in oil production, flushing, killing, and development of oil and gas wells. The backwash valve contains a hollow body with connecting threads. Inside the hollow body, stationary elements are placed, including a sleeve, a pressure bushing, and a support bushing, fixed by means of a thread, and movable elements are placed, including a hollow rod, an axle box, a spring, a seat with a locking element, and sealing elements. The pressure bushing is fixed in the lower part of the hollow body and with the possibility of placing a sleeve on it. The support bushing is fixed in the upper part of the hollow body and with the possibility of placing the hollow rod in it. The sleeve is made with through windows in the upper part and with a ledge, with the possibility of creating a cavity between the hollow body and the sleeve for placing the spring in this cavity on the lower part of the sleeve. The hollow rod is hermetically connected to the support sleeve with the possibility of movement in it relative to the axis of the hollow body and is made with through windows. The box is made hollow with the possibility of placing a sleeve in it. It is located on the upper part of the sleeve and in the lower part of the hollow rod and is hermetically connected to the hollow rod with the possibility of moving along with the hollow rod. The spring is placed on the sleeve between the axle box and the lower base of the sleeve, the seat is arranged to be located and fixed on the axle box and tightly connected to the locking element and to the hollow stem, and the locking element is made in the form of a ball and is located in the saddle and on the ledge of the sleeve.

EFFECT: increased reliability and, accordingly, increased service life of the valve, including reduced corrosion of structural elements.

1 cl, 3 dwg