RU2250406C2 - Check valve - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: check valve comprises housing, valve gate, and passages. The valve gate is secured to the axle and is made of a flexible ring. The ring groove in the face cooperates with the ring projection of the flexible valve gate. The inner diameter is provided with a recess. The recess receives a stabilizer with conical surface and passages. The stabilizer cooperates with the valve gate from one side. From the other side the stabilizer cooperates with the face of the junction through the flexible ring.

EFFECT: enhanced reliability.

1 cl, 3 dwg

Description

The invention relates to the field of mining, in particular, to the oil and gas industry and can be used in oilfield equipment when installing a non-return valve in the grooves between the end surfaces of the piping connections in order to reliably overlap them with pressure differences between the front and the valve zones.

Known check valves containing housing, valves, mounted on the axes [2] - [19].

The disadvantages of the known check valves are the complexity in design, technological difficulties in manufacturing and, as a result, vibration and unreliability during operation, a small warranty period.

Known check valve, comprising a valve body, a shutter mounted on an axis and made in the form of a flexible elastic ring, hydraulic communication channels [1].

The disadvantages of the known non-return valve are unreliability during operation at high pressures MPa (kgf · cm ² ) 21 (210) and higher, especially in winter, when the check valves freeze, the back pressure breaks the gates off the axis together with ice plugs and threaded fasteners .

The technical task is to eliminate the design conditions of vibration, to exclude threaded fastening in the valve body of a flexible elastic shutter, to increase the reliability and service life of the check valve at high pressures MPa (kgf · cm ² ) 21 (210) and higher, especially in winter, in the convenience of its maintenance, maintainability and competitiveness.

The solution to the technical problem is achieved by the fact that inside the valve body are made: at the end of the annular groove for interaction with the annular protrusion of a flexible elastic shutter, on the inner diameter there is a recess in which a stabilizer with a conical surface and hydraulic communication channels is installed, interacting, on the one hand, with the shutter , on the opposite side, through a safety elastic sealing ring, with the end surface of the connection.

A flexible elastic shutter made in the form of a disk spring, when interacting with the end face of the valve body or with the conical surface of the stabilizer, acquires the properties of a strained spring ring (Fig. 3).

Figure 1 shows the check valve installed in the pipe connection in the open position.

Figure 2 shows the valve in the closed position.

Figure 3 shows a flexible elastic shutter in a free state.

The check valve contains:

valve body 1,

end face of valve body 2,

annular groove 3,

annular protrusion of the shutter 4,

flexible elastic shutter 5,

recess 6,

stabilizer 7,

the conical surface of the stabilizer 8,

hydraulic communication channels in the stabilizer 9,

safety elastic sealing rings 10,

end surfaces of the connection 11

In a static position, the elements of the check valve interact as follows.

In the annular groove 3, made in the valve body 1, the annular protrusion 4 is installed flexible elastic shutter 5.

In the groove 6, made on the inner diameter of the valve body, a stabilizer 7 is installed.

In the inner annular grooves of the valve body, safety elastic sealing rings 10 are installed (decision to grant a patent according to application No. 9810438/03).

In this case, the safety elastic sealing ring 10 fixes the stabilizer 7, which compresses the flexible elastic shutter 5 to the end 2 of the valve body 1.

Flexible elastic shutter 5 when interacting with the end face 2 of the valve body 1 acquires the properties of a strained spring ring (figure 2).

The assembled check valve is installed, for example, in the groove between the end surfaces of the connection 11 and is tightened with threaded rods and nuts (not shown in the drawings).

In a dynamic position, in the pipeline, the elements of the check valve interact as follows.

When the pressure drops in the front and valve areas of the pipeline (turning on the pump unit) under the pressure of the pumped medium, a flexible elastic shutter 5 interacts with the conical surface 8 of the stabilizer 7.

The pumped medium, enveloping the flexible flexible shutter 5, through the hydraulic communication channels 9, is pumped through the pipeline in accordance with the technological regulations. The valve is open (figure 1).

Moreover, the presence of an annular groove 3, in which a flexible elastic shutter 5 is installed, through the annular protrusion 4 provides reliable fastening of the shutter, and the presence of a conical surface 8 in the stabilizer 7 eliminates the vibration of the flexible elastic shutter during operation.

With pressure differences between the front and the valve areas of the pipeline (shutting down the pump unit) under the action of a spring-loaded property, a flexible elastic shutter 5 at the end 2 of the valve body 1 closes the non-return valve and additionally compresses the flexible through the hydraulic communication channels 9 made in the stabilizer 7 and compresses elastic shutter 5 to the end 2 of the valve body 1. The valve is closed (figure 2).

In winter, when the check valve freezes, the stabilizer 7, due to the interaction through the safety elastic sealing ring 10 with the end surface of the joint 11, prevents the flexible elastic shutter from shifting in the direction of the axis of the check valve and its disengagement from the annular groove 3 made at the end 2 of the housing valve 1.

The proposed new technical solution of the non-return valve differs from the known technical solutions by its novelty and its use in production, especially in winter, when the valves freeze, will increase the reliability indicators of oil and gas production equipment.

The proposed non-return valve in terms of technical solutions has no analogues both in the Russian Federation and abroad, is easy to manufacture, reliable, maintainable, competitive and will be widely used in industry with a positive technical and economic effect.

Literature

[1] US No. 1408724 A F 16 K 15/14, 1922

[2] SU No. 229897 A F 16 K 1/38, 1968

[3] DE No. 2119613 C 3 F 16 K 15/14, 1978

[4] SU No. 1702052 A 1 F 16 K 41/02, 1991

[5] SU No. 1670278 A 1 F 16 K 41/02, 1991

[6] US No. 3381628 A f 16 K 15/14, 1974

[7] A. St. No. 124257 Class 47 d. 47/01, 1958

[8] GB No. 847513 A F 16 K 15/14, 1960

[9] A. St. No. 395654 F 16 K 15/10, 1973

[10] SU No. 344200 M. Cl F 16 K 3/28, F 16 K 15/14, 1972

[11] GB No. 2274327 A F 16 K 15/14, 1993

[12] GB No. 1020359 A. F 16 / K, 1996.

[13] JP No. 0473261 A2. F 16 K 15/14, 1991

[14] H.Rabia oil well drilling technology. ed. Moscow. "The bowels", 1989, p. 226, Fig. 8.21.

[15] Driller's satellite. Directory. K.V. Johansen. Moscow "Nedra". 1990, p. 84, fig. 5.23 p. 160, fig. 7.9.

[16] Driller's satellite. Directory. K.V. Johansen. Moscow "Nedra". 1981, p. 90, fig. 34, fig. 35.

[17] Technique and technology for overhaul of wells A.V. Suleimanov and other ed. Moscow. "Bosom". 1987, p. 226, fig. 8.21.

[18] Logging, testing, perforation and torpedoing of wells. L.F. Shakirov. ed. Moscow "Nedra", 1987, p. 46, Fig. 20.

[19] UDC 621.646.24 (031). Pipe fittings with automatic control. Directory edited by S.I.Kosykh. Leningrad. “Mechanical Engineering” 1982, pp. 142-167.

Claims (2)

1. The check valve, comprising a valve body, a shutter mounted on an axis and made in the form of a flexible elastic ring, hydraulic communication channels, characterized in that the valve body is made on the end face of the annular groove for interaction with the annular protrusion of the flexible elastic shutter, on the inner diameter recess in which a stabilizer with a conical surface and hydraulic communication channels is installed, interacting on one side with the shutter, on the opposite side through a safety elastic seal ring with end face of the joint. 2. The check valve according to claim 1, characterized in that the flexible elastic shutter, made in the form of a disk spring, when interacting with the end face of the valve body or with the conical surface of the stabilizer, acquires the properties of a stressed spring ring.

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