RU180412U1 - Reverse Shutter - Google Patents

Abstract

The utility model relates to valve engineering and can be used in the manufacture, preservation, re-preservation, installation, operation, repair, storage and disposal of non-return valves used as shutoff valves in pipelines of technological systems of nuclear power plants (NPPs), nuclear power plants (NPPs), and thermal power plants (TPPs), as well as in trunk oil and gas pipelines in normal operation systems and in safety systems to prevent backflow of the working medium. This result is an increase in the manufacturability and repair process, an increase in the reliability and tightness of the locking elements due to the self-installation of a disk (plate, flap) on the saddle and compensation of the deviation of the angles and the relative position of the sealing surfaces that occur during inaccurate manufacture and wear of the sealing surfaces during the operation of the shutter , in the return valve, comprising a housing and a saddle with a sealing surface located in the housing and a swing arm with a di with a sealing surface, the disk is attached to the bracket movably by means of a spherical hinge with the possibility of self-installation of the disk in the saddle. The spherical hinge is made in the form of a journal with a spherical surface mounted in the recess of the disk, the movable position of which is provided in the disk by a screw with a concave nut screwed into the disk spherical surface to obtain a spherical hinge formed by the convex surface of the journal and the concave surface of the nut screwed into the disk Preventing inadvertent unscrewing the nut from the disc. 5 cp f-ly, 12 ill.

Description

Technical field

The utility model relates to valve engineering, in particular to reverse valves, and can be used in the manufacture, preservation, re-preservation, installation, operation, repair, storage and disposal of reverse valves used as shutoff valves in pipelines of nuclear power plant technological systems (AS), nuclear power plants (NPPs), thermal power plants (TPPs), and also in trunk oil and gas pipelines in normal operation and safety systems in order to prevent backflow of work her environment.

State of the art

Pipe fittings are used in a number of industries, primarily in the energy sector, for plants and pipelines operating in various environments and extreme conditions: at pressures from thousands of atmospheres to deep vacuum, both at very high and very low temperatures. In this regard, modern valve industry is an independent industry, producing valves for various purposes, sizes and designs.

Pipe fittings of thermal shops of modern power plants is one of the most complex elements of equipment. More than four thousand units of valves have been installed at one 1000 MW power unit alone; therefore, the issues of designing and manufacturing reliable pipeline valves, the use of special materials, as well as inspection and repair methods are very important [A. Kizhner. Repair of pipeline valves of power plants: Textbook. allowance for prof. training workers in the workplace. M .: Higher. School, 1986. - 144 s, p. 4].

A common type of shutoff valves designed to prevent abnormal situations associated with an emergency change in the direction of flow of the working medium are check valves, which are disk locks that prevent the back flow of the working medium [GOST R 52720-2007. Pipe fittings. Terms and Definitions].

Reverse gates are used both in normal operation systems of power plants and as elements of safety systems, for example, to protect steam generators of nuclear power plants along the secondary circuit in order to prevent backflow of the working medium.

Known reverse shutter valves, having rotary disks (plates, flaps) inside the housing as a locking member, which are maintained in the "open" position by the flow of the working medium during normal operation of the pipeline, and in emergency situations are moved to the "closed" position with the passage the cross-section of the shutter as a result of the tight pressing of the disks to the valve seats.

In other words, when using reverse valves in normal operation systems, rotary disks (plates, flaps) are usually in the open state to allow the medium to pass through, and in emergency situations they close the valve to prevent the medium from flowing back.

When reverse valves are used as elements of safety systems, they separate circuits with different pressures during normal operation of the installation and communicate them when the differential pressure across the valve is equalized or specified, in which case the disk (plate, catch) of the valve is usually in the closed position.

Known used in pipeline systems of nuclear power plants with VVER reactors is a reversible rotary valve, having a body with a cover and a rotary plate with a seat installed inside the body, as well as a rod pivotally connected to the plate through the cover [catalog of ChZEM OJSC, TSNIITEITYAZHMASH, 1997, pp. . 121-122].

Known reverse butterfly valve, which contains a housing, a saddle mounted on a movable connection with the axis of the plate, dividing the flow part into the input and output cavities. The plate is fixed directly on the saddle between the eyes of the latter with the help of an axis and forms a single unit with it. A saddle with a through hole is fixed in the housing using a threaded sleeve. A gasket is installed between the seat and body. The housing consists of two parts with central passage holes aligned with each other. Parts of the housing are interconnected by means of a thread. A sealing gasket is installed between the parts of the housing. The threaded connection is fixed with a pin. The longitudinal axis of the seat bore is located at an angle to the longitudinal axis of the body parts. In an embodiment, the housing is made integral and with the help of studs and nuts is connected to the inlet and outlet flanges. Sealing gaskets are installed between the body and the flanges. The longitudinal axis of the housing holes and flanges match. The longitudinal axis of the seat bore is located at an angle to the longitudinal axis of the body and flanges. The utility model is aimed at increasing the tightness between the seat and the plate, as well as at improving the maintainability of the valve, which made accessible the surface of the seat and plates for machining and grinding [RU 2295085 F16K 15/03 F16K 27/02 Publ. 03/10/2007].

When the nut is loosened, the seat assembly with the plate is removed from the body, but when the eyes of the seat and the plates are worn, they must be cut off mechanically or in another way, then new ones must be welded, but in such a way as not to disturb the relative position of the sealing fields of the seat and plate, which is enough difficult and time consuming.

Known reverse valve, which to increase the maintainability of the shutter contains a housing covered by studs with nuts connecting the inlet and outlet flanges, a seat sealed fixed closer to the inlet flange, pivotally connected to the plate. A shell in which a saddle is installed in the inner cavity is sealed in an enclosure with an annular rib. An annular groove is made on the outer surface of the saddle. A groove is made from it in the axial plane towards the output flange. In the mentioned annular groove and groove is placed an eye for mounting the plate [RU 2378551 F16K 15/03 Publ. 01/10/2010].

Known check valve, which contains a housing covered by studs with nuts connecting the input and output flanges. In the housing there is a shell with an annular rib. A saddle is fixed in the inner cavity of the shell, in the outer grooves of which there is an eye with a plate. Grooves are made along the edges of the inner surface of the housing. In them, with sealing elements, a shell with an annular rib is installed at one end and a sleeve at the other. The outer end surfaces of the shell and the sleeve act as mating surfaces that mate with the mating surfaces of the input and output flanges [RU 2410592 F16K 15/03 Publ. 01/27/2011].

Known reverse valve, which contains covered on two sides by flanges of the housing, the bore of which is blocked by a plate placed in a niche of the housing and mounted on an axis. The axis is placed in a groove in the upper part of the housing with recesses along the edges of the latter. The groove is made in the form of a T-groove with a Central recess. The ends of the axis are made in the form of a rectangle with a width of one side equal to the height of the base of the T-shaped groove, and on the other hand, the width of the groove perpendicular to the base of the T-shaped groove [RU 2455545 F16K 15/03 Publ. 07/10/2012].

The closest in technical essence and the achieved technical result is a reversible butterfly valve, which, to improve technical and economic characteristics due to the increased level of safety, reliability and duration of operation, contains a housing with a cover and a rotary plate with a saddle mounted inside the housing, as well as passing through the cover the rod pivotally connected to the plate, there are two rod actuators. Activation of the first of them - pneumatic - causes the plate to close. The second drive - spring - is installed for passive opening of the plate with an inactive pneumatic drive. In addition, a control system is connected to the pneumatic actuator, which activates it by supplying gas to it when the medium pressure inside the valve reaches the set closing value, and deactivates it by releasing gas from it when the medium pressure inside the valve reaches the set opening pressure [RU 2546884 F16K 15/03 Publ. 04/10/2015].

The disadvantage of RU 2546884 is the low reliability due to the complexity of the design, the rigid fastening of the plate to the bracket and the lack of freedom of rolling of the plate in the direction perpendicular to the axis of the nozzles.

The common disadvantages of RU 2546884 and the known designs of reverse valves are the complexity of manufacturing and repair, insufficient tightness associated with the need for accurate fitting of sealing surfaces, insufficient reliability and durability of operation due to wear of sealing surfaces, which is especially true at high pressures and temperatures in high hazard systems .

Task and technical result

The objective of the utility model is to eliminate the technical shortcomings of the known designs of reverse valves, the need to increase the tightness and reliability of the valve with mutual deviations of the planes of the sealing surfaces of the saddle and disk.

The technical result in the implementation and industrial implementation of the proposed reverse shutter is to increase the manufacturability and repair, increase the reliability of operation and the tightness of the locking elements due to the self-installation of the disk (plates, flaps) on the saddle and compensation of mutual deviations of the planes of the sealing surfaces that occur during inaccurate manufacture and wear sealing surfaces during operation of the shutter.

Utility Model Essence

A distinctive feature of the proposed reverse swing shutter is the presence of a spherical hinged connection of a disk (flaps, rubbing) with a sealing surface to a swinging arm installed in the housing, which allows the disk to self-install along the seat installed in the housing regardless of deviations of the seat plane from the perpendicularity of the nozzle axis in any plane, which significantly increases the shutter tightness, simplifies its manufacture and repair by reducing positioning requirements seats and adjusting the sealing surfaces of the surfaces, and also increases the durability and reliability of the shutter by automatically compensating for wear on the sealing surfaces of the disk (flap) and saddle.

The problem is solved, and the required technical result is achieved by the fact that in the reverse rotary valve, comprising a housing and a seat with a sealing surface and a swinging bracket with a disk attached to it with a sealing surface, according to a utility model, the disk is movably attached to the bracket by means of a spherical hinge with the possibility of self-installation of the disk on the saddle, while the spherical hinge is made in the form of a journal mounted on the disk recess and attached to the bracket fericheskoy surface, moving the position of which is provided in the disk drive nut is screwed into the concave spherical surface to obtain a spherical hinge formed by a convex surface and the concave surface of the spigot in the screwed nut drive.

The spherical hinge contains means for preventing spontaneous unscrewing of the nut from the disk, made for example in the form of U-shaped fixing elements,

the seat located in the housing is made in the form of a sleeve screwed, screwed or welded into the housing with a sealing surface, and

the bracket contains means for limiting the maximum angle of the disk relative to the seat in the shutter position "open", made, for example, in the form of a stop installed in the end part of the bracket.

In this case, the sealing surfaces of the saddle and the disk are made with a wear-resistant deposited coating, and the shutter contains means for indicating the position of the disk in the housing, for example, a reed type.

Brief Description of the Drawings

In FIG. 1 shows a general view of a reverse shutter with a quarter cutout in the closed position.

In FIG. 2 shows the cross section of the shutter, then the shutter, in the closed position, which shows: a disk (flap) 1, an arm 2, a trunnion 3 with a convex spherical surface, a nut 4 with a concave spherical surface, a retainer 5 of a nut 4, a fixing screw 6, emphasis 7, valve body 8, valve cover 9, sleeve-saddles 10, plugs 11 for transportation and preservation.

In FIG. 3 shows a General view of the shutter

In FIG. Figures 3, 4 and 5 show the locking body of the valve assembly and in an exploded form, respectively containing a disk (flap) 1, an arm 2, a trunnion 3 with a convex spherical surface, a nut 4 with a concave spherical surface, a nut retainer 5, a fixing screw 6 and a stop 7.

In FIG. 6-12 show general views of the individual parts of the locking assembly of the shutter, respectively, of the disk (flap) 1, trunnion 3, nut 4, retainer 5, bracket 2, screw 6 and stop 7.

Implementation and industrial implementation of utility model

Structurally, the rotary shutter comprises (Fig. 1-10) a disk (flap) 1 with a deposited wear-resistant sealing surface that is pivotally attached to the bracket 2 by means of a trunnion 3 with a convex spherical surface and a nut 4 with a concave spherical surface with a retainer 5 and a fixing screw 6 providing tight self-installation of a disk on a saddle and tight closing of a passage section in the shutter position is "closed".

The bracket 2 with the disk 1 movably attached to it is installed inside the shutter body 8 on a hinge with the possibility of swinging relative to the sealing surface of the seat, made in the form of a sleeve-seat 10 installed in the housing with the possibility of opening the passage section of the valve in the open position of the valve and overlapping the passage section the shutter in the closed position.

The assembly of the shutter with a movable mounting of the disk 1 to the bracket 2 is as follows:

A trunnion 3 with a spherical surface is installed in the corresponding recess in the disk 1, the movable position of which in the disk is provided by a nut 4 with a concave spherical surface to obtain a spherical hinge formed by the convex surface of the trunnion 3 and the concave surface of the nut 4 screwed into the disk (flap).

The spontaneous unscrewing of the nut 4 from the disk (flap) 1 is prevented by the latch 5. The trunnion 3 is attached to the bracket 2 by means of a screw 6.

After installing the bracket 2, the housing 8 is closed by a cover 9, which is fixed to the housing by a conventional connection, for example, of the type “stud-nut”.

All moving parts of the shutter are moving freely without jamming.

The nozzles for supplying and discharging the shutter working medium can be welded, with flange or other connections to the working medium pipeline.

To prevent any contaminants from entering the housing, the nozzles for supplying and discharging the working medium during storage, transportation and preservation of the shutter are closed with plugs 11.

Housing parts, parts of the locking element are made of commonly used material, for example, corrosion-resistant steel, and the sealing surfaces are made of wear-resistant sealing welds, for example, according to NP-068-05, and the sealing of the points of attachment of the cover to the body with gas-expanded graphite gaskets in the form of extruded rings .

The inventive valve is made of commonly used materials according to conventional manufacturing techniques of pipe fittings, taking into account the conditions of their operation.

A shutter is made in accordance with the requirements of TU3742-104-80841593-2012, in particular, with the relevant regulatory documents:

- “Rules for the design and safe operation of equipment and pipelines of nuclear power plants” (PNAE G-7-008-89 with amendment No. 1);

- “Pipe fittings for nuclear plants. General technical requirements ”(NP-068-05);

- “General Provisions for the Safety of Nuclear Power Plants OPB-88/97” (NP-001-97 (PNAE G-01-011-97));

- “Design Standards for Earthquake-Resistant Nuclear Power Plants” (NP-031-01).

The shutter works as follows:

In the operating position of the shutter, the "open" flow of the working medium is supplied under the disk (flap) 1 (from left to right in Fig. 1, 2), the disk (flap) 1 rises and moves away from the seat 10 by the pressure of the flow of the working medium, providing a flow of the working medium in the right direction.

The maximum angle of the disk (flap) 1 inside the housing is limited by the stop 7.

Upon termination or change of the flow of the working medium, the backward shutter automatically switches to the “closed” operating position, while the disk (flap) falls under the influence of its own weight and / or backpressure, adjoins the saddle, closes the passage section and stops the reverse movement of the working medium.

The shutter can be equipped with a remote indicator of the position of the disk (flap), for example, a reed switch type with a magnetic switch operating on the principle of a moving rod with the transmission of a position signal from a permanent magnet.

The sealing surfaces of the seat and disc (flaps) can be made of anti-corrosion sealing surfacing, for example, according to NP-068-05.

Technological processing of parts, assembly, installation in the pipeline, maintenance and tightness control are carried out in the usual way in accordance with the requirements of the technical documentation of the valve operating systems.

The shutter of the design described above is repairable without cutting from the pipeline.

After the shutter develops an assigned resource or an appointed service life, work is carried out in accordance with the rules (methods) of establishing a residual resource, and then to extend the assigned indicators or, if necessary, repair and / or disposal.

The advantage of the claimed utility model is that the proposed shutter design allows for its reliable operation, to compensate for deviations of the angle of inclination of the sealing surfaces of the seat and disc (flap) during their manufacture and the functioning of the shutter, to save the working environment flowing through the shutter as a result of increased high tightness, provided by the self-installing hermetic arrangement of the disk (flaps) in the passage section of the valve seat.

The design and technological features of the utility model disclosed above prove not only the causal relationship of the essential features and the technical result, but also prove the feasibility of industrial implementation of the utility model and the confident achievement of the technical result, namely, they increase the manufacturability of manufacture and repair, increase the reliability of operation, and increasing the tightness of the locking unit due to the tight self-installation of the disk (flaps) on the saddle and compensation for opening -toxic angles and relative position of the sealing surfaces in the manufacture and operation of the shutter.

Claims (5)

1. Reverse valve, comprising a housing and a saddle with a sealing surface located in the housing and a swing arm with a disc attached to it with a sealing surface, characterized in that the disc is movably attached to the arm with the possibility of self-mounting the disc along the saddle by means of a spherical hinge made in the form of an installed in the recess of the disk and a trunnion attached to the bracket with a spherical surface, the movable position of which in the disk is ensured by a screw with a concave spherical nut screwed into the disk th surface to obtain a spherical hinge formed by a convex surface and the concave surface of the spigot in the screwed nut drive with means to prevent its spontaneous unscrewing of latching elements U-shaped. 2. The shutter according to claim 1, characterized in that the seat located in the housing is made in the form of a sleeve screwed, bolted or welded into the housing with a sealing surface. 3. The shutter according to claim 1, characterized in that the bracket contains means for limiting the maximum angle of the disk relative to the seat in the shutter position "open", made, for example, in the form of a stop mounted in the end part of the bracket. 4. The shutter according to claim 1, characterized in that the sealing surfaces of the seat and disk are made with a wear-resistant weld coating. 5. The shutter according to claim 1, characterized in that it comprises means for indicating the position of the disk in the housing, for example, a reed switch type.

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