RU2449192C1 - Reversible check valve - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: reversible check valve includes cylindrical body 1 with stepped hole 3. Direct-acting and reverse-acting valves are arranged in it. Reverse-acting valves include shutoff elements 15 and 16 with mounting seats 13 and 14 with inlet and outlet fluid passage channels. There is return spring 19 for reverse-acting valve, which interacts with adjusting nut 23. Valve is equipped with stepped cylindrical valve module 4 installed in hole 3 of housing so that annular gaps 5 and 6 are formed. In module 4 there made are opposite directed holes 9 and 10 for installation of mounting seats 13 and 14 of direct-acting and reverse-acting valves. Seats 13 and 14 are located on the axis coinciding with axis of body 1. Holes 9 and 10 are connected to non-crossing inclined fluid passage channels 11 and 12 respectively. Shutoff element 15 of direct-acting valve and limit stop 17 of its movement are installed in upper part of module 4. Shutoff element 16 of reverse-acting valve is arranged in lower part of module 4 with possibility of interaction with limit stop 20. Limit stop 20 is installed on the other end of return spring 19, equipped with mounting hole 21 for shutoff element 16 and fluid passage holes 22.

EFFECT: higher reliability, improved reparability, easy erection and longer service life of valve.

6 cl, 4 dwg

Description

The invention relates to pipe fittings and can be used in the oil industry, in particular in downhole production equipment, and can be used in the production of formation fluid, maintenance work, flushing and well development.

Known check valve (RF patent No. 2391592, IPC F16K 15/04, publication date 10.06.2010), comprising a housing with upper and lower internal connecting threads, a movable stepped glass with through holes, on the outer surface of which an annular groove is made, in which an elastomeric ring gasket, a clutch for adjusting the spring preload, a protective seal, preloaded by a stopper, a locking element in the form of a ball are installed.

A disadvantage of the known non-return valve is its low reliability during operation due to the possibility of solid particles contained in the formation fluid falling into the gap between the movable stepped glass and the through hole of the plug, which can lead to jamming of the glass, resulting in loss of tightness and performance devices.

The disadvantage of the non-return valve is also that during maintenance work, the flushing fluid passes between the turns of the compressed spring, which increases the hydraulic resistance to the fluid flow and accelerates the wear of the spring.

In addition, the presence of an annular gasket made of an elastomeric material in the device reduces the design resistance to aggressive fluids containing chemical reagents that are used in flushing fluids during maintenance work in the well.

Known reverse valve reverse action (RF patent No. 65598, IPC F16K 1/38, published date 08/10/2007), taken as a prototype, which contains a housing with a tapered surface of the seat seat, a reverse valve with an external tapered surface of the seat seat, direct acting valve with an external counter-conical surface of the reverse-acting valve. The check valve is also equipped with a spring and a restrictive nut for a direct-acting valve, an emphasis with an external thread and through holes for fluid flow, a lock nut, a spring for a reverse-acting valve, and an adjusting nut.

A disadvantage of the known reverse reversing valve is the low reliability during operation due to the possibility of the ingress of solid particles contained in the reservoir fluid between the tapered surfaces of the seat seats of the direct and reverse valves, which can lead to a loss of tightness and operability of the valves.

The disadvantages of the known valve are also that during maintenance work, the flushing fluid passes between the turns of the compressed spring of the reverse-acting valve, which increases the hydraulic resistance to the fluid flow and accelerates the wear of the spring.

In addition, the installation of a direct-acting valve in the device coaxially with the reverse-acting valve using an axis passing in the stop hole and additionally equipped with a direct-acting valve spring and a restrictive nut complicates the assembly and design of the product, which reduces the overall operational reliability of the product.

The objective of the invention is the development of the design of the reverse check valve, ensuring operational reliability, maintainability, reducing hydraulic resistance to fluid flow.

The technical result consists in increasing the reliability of the device, ease of installation, maintainability, in increasing the service life by eliminating jamming and destruction of moving structural elements under the influence of aggressive media and solid particles contained in the reservoir fluid.

The specified technical result is achieved by the fact that the check valve is reversible, comprising a cylindrical body with a hole in which direct and reverse action valves are located, including locking elements with seat seats with inlet and outlet channels for fluid passage, a return spring for the reverse action valve interacting with the adjusting nut, according to the invention, is equipped with a stepped cylindrical valve module mounted in a stepped opening of the housing with the formation of annular in this case, the module has multidirectional holes for mounting the seat seats of direct and reverse valves, located on an axis coinciding with the axis of the body, connected to disjoint inclined, axisymmetric output and input channels for fluid passage, respectively, while the shut-off element of the direct-acting valve and a limiter for its movement are installed in the upper part of the module, and the shut-off element of the reverse-acting valve is located in the lower part of the module with the possibility of interaction with an emphasis mounted on the second end of the return spring, equipped with a landing hole for the shut-off element of the reverse valve and holes for the passage of fluid.

The installation of a direct-acting valve with a seat, a shut-off element and a limiter, as well as the execution of a valve seat of a reverse-acting valve, input and output channels for the passage of fluid in the form of a single assembly - a module allows to simplify the design, increase its safety and reliability, reduce hydraulic resistance to fluid flow, increase ease of assembly / disassembly of the valve and its maintainability due to the interchangeability of the module.

The technical result is also achieved by the fact that the passage holes in the stop located above the return spring, forces the fluid flow during operation to pass through the internal cavity of the spring, which allows to reduce hydraulic resistance to the fluid flow, as well as protect the spring from destruction (erosion), increase durability and valve reliability.

Performing a stop hole (for example, a step hole) for the shut-off element of the reverse-acting valve limits its movement in the transverse direction relative to the axis of the reverse-acting valve, which increases the reliability of the reverse-acting valve when performing preventive maintenance related to flushing the equipment.

The execution of the valve body by an assembly consisting of two half-bodies interconnected by means of a detachable connection (for example, threaded) allows, when the valve components are worn, they can be freely replaced, which increases the convenience of assembling / disassembling the reversing valve and its maintainability.

Installing the valve module in the stepped hole of the first half-housing and pressing it with the end surface of the second half-housing makes it possible to securely fix the valve module in the housing in compliance with the alignment with respect to the valve body, and also improves the ease of use and allows quick installation / replacement of the module in the valve body.

The implementation of the limiter displacement of the locking element of the direct-acting valve in the form of a lattice fixed in the module using a detachable connection, such as threaded, improves the maintainability of the valve module.

The implementation of the locking elements in the form of balls eliminates the ingress of solid particles contained in the reservoir fluid between the ball and the annular seat due to the small contact area of these elements, which prevents loss of valve tightness.

The implementation of the locking elements and seat seats of direct and reverse valves from a hard wear-resistant and acid-resistant material eliminates the destruction of direct and reverse valves under the influence of the aggressive medium of the pumped liquid and the mechanical impurities contained in it, which increases the life of the product.

The presence of these signs allows us to conclude that the novelty of the technical solution.

When comparing the claimed solution with other technical solutions in the given technical field, no totality of features has been identified that distinguish the claimed solution from the prototype, which allows us to conclude that the technical solution meets the criterion of "inventive step".

Thus, the claimed solution is new, has an inventive step, industrially applicable.

Figure 1 shows a General view of the check valve reversing, locking elements are closed. Figure 2 shows a section aa valve. Figure 3 shows the reverse check valve with an upward flow of liquid. Figure 4 - reverse check valve with reverse fluid flow during maintenance work.

The reversing check valve contains a cylindrical body, for example, consisting of two half-bodies 1 and 2 with a stepped hole 3, in which a stepped cylindrical valve module 4 is installed with annular gaps 5 and 6 formed by the inner surface of the half-bodies 1 and 2 and the outer surface of the steps 7 and 8 respectively. In module 4, multidirectional openings 9 and 10 are made, connected to disjoint oblique axisymmetric channels 11 and 12, respectively, the dimensions and quantity of which depend on the passage section of the reverse valve. In the openings 9 and 10, ring saddles 13 and 14 and locking elements (balls) 15 and 16 are installed, forming direct and reverse action valves, respectively. The valve module 4 is equipped with a stopper 17 of the axial movement of the ball 15. In the stopper 17 holes 18 are made for the passage of fluid. The ball 16 is preloaded by the spring 19 by means of a stop 20, in which a stepped hole 21 is made to accommodate the ball 16 and longitudinal holes 22 for the passage of fluid. To regulate the compression of the spring 19, its second end is equipped with an adjusting nut 23 installed using a threaded connection in the half-housing 2.

The reverse check valve operates as follows.

When the pump is turned on under the action of an upward flow, the produced fluid sequentially passes through the hole of the adjusting nut 23, the internal cavity of the spring 19, the longitudinal holes 22 of the stop 20 and enters the annular gap 6. At the same time, the reverse valve is closed, since the ball 16 is pressed by the spring 19 to the seat 14. Further, the liquid, passing through the channels 11 and the hole 9, raises the ball 15 above the seat 13 and exits through the holes 18 of the limiter 17 into the tubing (not shown).

When the pump stops under the action of a column of formation fluid, a pressure differential occurs between the zones located before and after the reverse valve, while the ball 15 sits on the seat 13, blocking the return flow of fluid into the cavity 6. In this case, the reverse valve remains closed (ball 16 is pressed spring 19 by means of an emphasis 20 to a saddle 14). Thus, the column of liquid is held in the tubing string, preventing the reverse rotation of the working parts of the pump.

When carrying out preventive work related to flushing equipment from the deposition of salts, paraffin hydrates and other solid formations, and carried out after stopping the pump and closing the direct-acting valve, flushing fluid is supplied to the tubing string under a pressure exceeding the operating one, which passes through the annular gap 5 of the valve reverse reverse, through the channels 12 into the hole 10 and overcoming the elastic force of the spring 19, squeezes the ball 16 from the seat 14 and presses it into the stepped hole 21 of the stop 20, which prevents Moves the ball 16 in the transverse direction relative to the axis of the reverse valve. Next, the flushing fluid passes through the longitudinal holes 22 of the stop 20, the internal cavity of the spring 19 and the hole of the nut 23 and goes to the pump, ensuring its flushing.

The proposed design of the reverse reversing valve allows to ensure high reliability of valve actuation, increase the product life, reduce the hydraulic resistance of the fluid, which generally increases the valve capacity and reduces energy costs for pumping fluid.

Claims (6)

1. The check valve is reversible, comprising a cylindrical body with a hole in which direct and reverse action valves are located, including locking elements with seat seats with inlet and outlet channels for fluid passage, a return spring for the reverse valve interacting with the adjusting nut, characterized in that it is equipped with a stepped cylindrical valve module installed in a stepped opening of the housing with the formation of annular gaps, while the module is made multidirectional openings for mounting the seat seats of direct and reverse valves located on an axis coinciding with the axis of the body, connected to disjoint inclined, axisymmetric output and input channels for fluid passage, respectively, while the shut-off element of the direct-acting valve and the limiter for its movement are installed in the upper parts of the module, and the shut-off element of the reverse-acting valve is located at the bottom of the module with the possibility of interaction with the emphasis mounted on the second end of the return springs equipped with a landing hole for the shut-off element of the reverse valve and holes for the passage of fluid. 2. The reverse check valve according to claim 1, characterized in that the housing is prefabricated, consisting of two half-bodies, interconnected by a detachable connection. 3. The non-return valve according to claim 2, characterized in that the valve module is located in the stepped hole of the first half-housing and is fixed with the second half-body pressed on by the end surface. 4. The non-return valve according to claim 1, characterized in that the limiter of movement of the locking element of the direct-acting valve is made in the form of a lattice fixed in the module using a detachable connection. 5. The reverse check valve according to claim 1, characterized in that the locking elements of the direct and reverse action valves are made in the form of balls. 6. The non-return valve according to claim 1, characterized in that the locking elements and seat seats of the direct and reverse-action valves are made of solid wear-resistant and acid-resistant material, for example tungsten carbide.

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