RU182782U1 - Bellows valve - Google Patents

Abstract

The utility model relates to the field of pipe fittings and can be used in chemical, energy, oil and gas and other industries. To increase the reliability of operation and maintainability, a bellows valve containing a housing with inlets for supplying and discharging a working medium, a cover, a bellows-sealed stem and a shut-off element in the form of a slide valve movably attached to the valve stem, has a sleeve installed inside the case with a light-press fit to move the valve the surface of the spool at the points of contact of the spool with the sleeve made annular surfacing of wear-resistant material, and in the side walls of the sleeve made through holes, with communicating with recesses on the outer surface of the liner, made possible for the overflow of the working medium from the nadzolotnogo space in the pipe outlet of the working medium when moving the spool inside the sleeve when the valve is opened and / or when the working medium is heated in the nadzolotnik space. The sleeve is installed and made thin-walled, not subject to torsional forces and working internal surface for wear at the points of contact with the spool. 7 c.p. f-ly, 6 ill.

Description

Technical field

The utility model relates to the field of pipe fittings and can be used in chemical, energy, oil and gas and other industries.

State of the art

Known pipe fittings installed on pipelines and tanks, designed to control (overlap, control, distribution, mixing, phase separation) the flow of the working medium (liquid, gaseous, gas-liquid, powder, suspensions, etc.) by changing the flow area [GOST P 52720-2007].

Valves are known in which the locking or regulating element moves parallel to the axis of the flow of the working medium [GOST R 52720-2007].

Known shut-off valves (gates) - shut-off and control valves, structurally made in the form of a valve, in which the locking element moves parallel to the axis of the flow of the working medium.

Shut-off valves, like other types of shut-off valves, are used to completely block the passage section, and, consequently, the flow of the working medium.

The locking element, which is most often the slide valve in the shut-off valve, is usually in the “open” or “closed” position during operation of the shut-off valve.

To control the flow rate of the medium by changing the flow area, control valves are successfully used, and there are also shut-off and control valves that combine these functions.

Until 1982 (before the entry into force of GOST 24856-81, which is currently replaced by GOST R 52720-2007), valves in which the shutter is moved by means of a threaded spindle – travel nut pair were called valves, but this name was abolished.

Nowadays, valves with a threaded spindle (transmitting torque from the actuator) and valves with a smooth stem (transmitting translational force from the actuator) are also called valves.

Valves of the valve type are controlled manually or by an electric actuator, and valves with a smooth stem are controlled by a hydraulic, pneumatic or electromagnetic actuator, as well as by a mechanical actuator from other devices.

Shut-off valves with high-speed pneumatic piston actuators are part of the protective valves and are called shut-off valves.

Valves are widespread as shutoff valves, which is explained by the possibility of providing good sealing in the shutoff body with the comparative simplicity of the design.

The valves are used for liquid and gaseous media with a wide range of operating parameters: pressure - from vacuum 5⋅10 ^-3 mm RT. Art. up to 250 MPa, temperatures - from -200 to + 600 ° С and are used on pipelines of relatively small diameters, since in the case of large sizes one has to deal with a significant increase in effort to control the valve and complicate the design to ensure the valve fits correctly on the housing seat.

Known bellows reinforcement, the sealing of movable elements relative to the external environment in which is provided by a bellows assembly, the main element of which is a bellows - corrugated tube.

By welding or soldering, a metal bellows is connected to the upper or lower rings (or parts of a different shape), forming the so-called bellows assembly.

The bellows assembly with its upper part is fixedly and hermetically connected to the body parts of the valve, and the lower one - with the valve stem or valve, thus blocking the possibility of the working medium entering the external medium through the means of sealing the movable rod.

The translational movement of the stem to control the spool occurs inside the bellows, which can change its length due to the deformation of the bellows corrugations.

Bellows valves (bellows valves) are commonly used to work with media that are not allowed to leak into the environment.

The advantage of bellows valves over stuffing boxes is the elimination of the leakage of the working medium into the atmosphere within the life of the bellows assembly, which is achieved by significantly complicating the design and correspondingly higher cost of the valve, but repairing the valve bellows during its fatigue failure is a difficult operation to replace the bellows assembly, therefore in such cases, the valve must be replaced with a new one.

A known valve comprising a housing, a rod with a locking member, connected to the spindle and kept from turning by a pin installed in the opening of the locking member and both ends in contact with the longitudinal grooves in the bellows sleeve [Guide of the designer of pipeline valves. - L .: Engineering, 1987, p. 91, Fig. 2.34].

The disadvantage of this valve is its large dimensions due to the non-compact arrangement of the main components, including the spindle-stem connection unit and the bellows assembly, as well as a large number of parts that reduce the reliability of the valve.

A valve is known comprising a housing, a cover, a sleeve with a gland assembly, a rod connected by a pin with a locking member, and a pressure gland with external protrusions located in the grooves of the cover, and with a longitudinal groove in which a key is connected, connected to the rod and holding it from rotation [SU No. 1687980, F16K 1/00, 06/29/89].

A known valve comprising a housing, a cover, a sleeve, a bellows, a glass and a locking element connected to the rod using a pin [RU No. 26623, F16K 1/00, 05/30/2002].

The disadvantage of the above devices is the lack of reliability of the connection of the rod with the locking element due to the absence of restrictions on the loss of the connecting pin under the influence of the flow of the working medium in the pipeline and the transmission of axial force to the pin when closing the valve.

A well-known bellows valve containing a housing, a stem, a bellows, a locking member and a bellows sleeve with longitudinal grooves, into which a pin is connected, connected to the rod and holding it from rotation [RU 28904, F16K 1/50, 12/19/2002].

The disadvantage of RU 28904 is that the locking element is connected by welding with a bellows and is rigidly connected to the rod, which excludes the possibility of its replacement during valve repairs and unreliably limits the working stroke of the locking element due to the fact that the pin in the "open" position abuts against end face of the rotating sleeve.

In conventional designs of bellows-free valves without bushings, when repairing them, the valve body must be polished, which is a very complex and time-consuming process without cutting from the pipeline. In this case, after grinding, the gap between the spool and the housing increases, which leads to a deterioration in the centering of the spool, an increase in the likelihood of skewing the spool during the working stroke and, accordingly, to a violation of the valve tightness in the closed position.

The closest in technical essence and the achieved result analogue (prototype) is a bellows valve containing a housing, a locking member and a stem sealed with a bellows, which is connected to the housing by a bellows sleeve having oblong holes equal in length and elongated along the axis of the rod for the ends of the pin installed perpendicular to the axis of the rod for attaching a locking member therein. The elongated holes in the bellows sleeve are made in the form of grooves for the movement of the ends of the rod and are located on the side of the lower end of the bellows sleeve, which covers the bellows and the junction of the rod with the locking member, located below the level of the bellows by the length of these elongated grooves. In this case, the upper walls of the elongated grooves limit the valve stroke in the "OPEN" position, and the pin is installed at an angle of 90 ° to the axis of the bellows valve nozzles in the holes in the locking body and the hole in the stem aligned with them, which is made elongated in the direction of the bellows along the axis of the stem so that forms a guaranteed gap when the pin is in it [RU 2250404 F16K 1/50 F16K 1/48 Publ. 04/20/2005 (prototype)].

The disadvantage of the bellows valve RU 2250404 (prototype) is the need for a thick-walled bellows sleeve with longitudinal grooves in which the ends of the pin move to prevent rotation of the spool and twisting of the bellows when moving the valve, as well as the simultaneous wear of the inner surface of the bellows sleeve and the side surface of the spool when opening / closing the valve, which, on the one hand, leads to an increase in the force on the actuator to ensure movement of the spool, and, on the other hand, the need for one temporary replacement of wear of friction pairs spool-sleeve, which is necessary to change the entire bellows assembly entirely and sleeve.

In well-known constructions of bellows valves with bellows bushings, for example, in accordance with RU 2250404 (prototype), it is necessary to replace the entire equally worn pair of sleeve-closure body and bellows assembly during repair, which is almost comparable in cost to the cost of a new bellows valve.

The objective of the utility model is to eliminate the disadvantages of the known designs of bellows valves, increasing the reliability of operation and maintainability of the bellows valve.

Technical result

The technical result obtained by the industrial implementation and use of the utility model is to increase the reliability of operation and maintainability of the bellows valve.

Utility Model Essence

A distinctive characteristic feature of the proposed bellows valve is the presence of a sleeve pressed into the body, inside of which the slide valve moves and with the inner surface of which the annular surfacing of wear-resistant material on the surface of the slide valve contact points is contacted when the slide valve moves inside the sleeve.

The sleeve is made of a thin-walled, non-torsional force and working inner surface only for wear, not structurally associated with the bellows assembly, the most expensive part of the bellows valve.

The presence of annular deposition of wear-resistant material on the surface of the spool at the contact points of the spool sleeve prevents spool wear and provides predominant wear on the inner surface of the sleeve at the contact points of the spool sleeve, therefore, with the required replacement of a worn sleeve, it is not necessary to replace the entire bellows assembly and / or spool, which significantly simplifies, speeds up and reduces the cost of repairs, increases the maintainability of the bellows valve and provides the ability to increase valve tightness after repair NTA without replacing the lock body.

During repair, a worn-out sleeve from the case is pressed out for the lower end, since its landing in the case is light-pressed and minimal efforts are required to remove the sleeve from the case.

Typical design features of the sleeve design in the utility model are the presence of through holes diametrically located in the side walls, communicating with recesses made on the outer surface of the sleeve, providing the overflow of the working medium from the nadzolotniknogo space into the outlet pipe of the working medium, which increases the reliability of the valve and eliminates damage to the bellows assembly and valve bodies during the tight movement of the spool inside the sleeve when opening the valve and when heating bochey nadzolotnikovom environment in space.

The problem is solved, and the required technical result is achieved by the fact that in the bellows valve containing the body with nozzles for supplying and discharging the working medium, a cover, a bellows-sealed rod and a locking member in the form of a slide valve movably attached to the rod, according to a utility model, a sleeve with the ability to move the spool in it, and on the surface of the spool in the places of contact of the spool with the sleeve made annular surfacing of wear-resistant material.

The sleeve is made of thin-walled, not subject to torsional forces and working inner surface for wear at the points of contact with the spool and installed in the housing with a light-press fit.

Through holes are made in the side walls of the liner, communicating with recesses on the outer surface of the liner, made possible for the overflow of the working medium from the nadzolotnogo space in the pipe outlet of the working medium when moving the spool inside the sleeve when opening the valve and / or when the working medium is heated in the nadzolotnogo space.

The spool is attached to the stem by means of a diametrical hole in the lower part of the stem, two diametrical holes in the side walls of the spool and a pin mating with them, while the diametrical holes in the side walls of the spool are mainly made located between the annular weld deposits of wear-resistant material.

The bellows valve may comprise a mechanical actuator, an electric actuator, a hydraulic actuator, a pneumatic actuator, an electromagnetic actuator, or a high-speed pneumatic piston actuator.

The valve cover can be made in the form of a rack-cover with the possibility of attaching a drive to it.

The bellows valve is predominantly made of corrosion-resistant austenitic steel, for example, steel 08X18H10T according to GOST 563.

Wear-resistant annular surfacing on the surface of the spool at the points of contact of the spool with the sleeve is made of a more wear-resistant material than the material of the sleeve.

The material TsN-6 or TsN-12M according to GOST 10051-75 or another wear-resistant material resistant to corrosion and scuffing can be used as a wear-resistant material in the manufacture of wear-resistant surfacing on the surface of the spool.

Brief Description of the Drawings

The essence of the utility model is illustrated by drawings of the bellows valve assembly and in an exploded form, as well as drawings of individual parts and assemblies, which show the spool 1, sleeve 2, housing 3, bellows assembly 4, cover-pillar of drive 5, drive 6, studs clamp the drive struts to the housing 7, the mounting washers of the strut to the housing 8, the nuts of the mounting of the strut to the housing 9, the mounting studs of the drive to the strut 10, the mounting washers of the drive to the strut 11, the nuts of the mounting of the drive to the strut 12, the pin of the spool to the bellows assembly 13, diametrically located holes 14 in the side walls of the spool for the pin for attaching the spool to the bellows assembly 13, wear-resistant ring weld deposits (end weld deposits of wear-resistant material) 15 on the side walls of the spool 1 at the points of contact spool / sleeve, sealing surfacing 16 at the point of contact spool / seat 3 , holes 17 in the side walls of the sleeve 7, communicating with the longitudinal recesses on the outer surface of the sleeve 7 for the overflow of the working medium from the nadzolotnogo space in the outlet pipe of the working medium when opening the valve the typical movement of the spool inside the sleeve when the valve is opened and / or when the medium is heated in the nadzolotnik space in the closed position of the valve.

In FIG. 1 shows a general view of an actuated bellows valve embodiment.

In FIG. 2 - exploded bellows valve with actuator disassembled.

In FIG. 3 shows a section of a bellows valve without an actuator assembly.

In FIG. 4 - the relative position of the spool, the bellows assembly and the pin for attaching the spool to the bellows assembly before assembly and installation in the bellows housing.

In FIG. 5 is a general view of a spool with a quarter cutout, which shows diametrically located holes for a spindle mounting pin to a bellows assembly rod, annular surfacing of wear-resistant material on the spool surface at the points of contact of the spool with the sleeve and the annular sealing weld at the contact point of the spool with the housing seat.

In FIG. 6 is a general view of the sleeve with diametrically located through holes in the side walls, communicating with grooves made on the outer surface of the sleeve for overflowing the working medium from the nadzolotnogo space into the outlet pipe of the working medium hermetically moving the spool inside the sleeve when opening the valve hermetically moving the spool inside the sleeve when opening the valve and / or when the medium is heated in the nadzolotnik space in the closed position of the valve.

Utility Model Implementation

The proposed bellows valve (Fig. 1, 3) is manufactured and assembled as follows (Fig. 2):

A thin-walled sleeve 2 is installed in the housing 3 by means of a light fit, which acts as a guide for the spool, the function of a protective element that protects the housing from wear when the spool moves to the open / closed position, as well as the function of increasing the tightness and maintaining the integrity of the structure and reliability of operation as a result of allowing free the flow of the working medium from the nadzolotnikovy space into the branch pipe of the outlet of the working medium during the tight movement of the spool inside the sleeve at approx ytii valve and / or heating of the working medium in nadzolotnikovom space in the closed position of the valve.

After pressing the sleeve 2 into the housing 3 install a bellows assembly 4 with a slide valve 1 movably attached to it by means of a pin 13.

Then, the cover-rack 5 is mounted on top and attached to the body by means of pins 7, washers 8 and nuts 9, sealing the internal cavity of the valve.

On top of the cover-rack 5 install the actuator 6, usually, but not necessarily including a flywheel, an electric drive, an articulated clutch.

The drive 6 is mounted and fixed on the cover-rack of the drive with studs 10, washers 11 and nuts 12.

The proposed bellows valve operates as follows:

In the drive 6, the rotational movement from the engine or the flywheel to one side (for example, clockwise) by means of the control is converted into translational movement of the rod from the upper position "open" to the lower position "closed". In this case, the stem together with the slide valve moves to the lower position, the lower end part of the slide valve mates with the sealing surface of the housing seat and closes the passage section of the housing, the valve is closed.

When creating a rotational movement in the actuator in the opposite direction (for example, counterclockwise), the rod by means of a control element together with the slide valve moves to the upper position, opening the passage section of the body, the valve is open.

When the valve is opened, part of the liquid from the supraorbital cavity flows through the openings and recesses in the sleeve into the sub-baffle cavity and into the discharge pipe of the working medium without interfering with the opening of the valve and maintaining tightness at the points of contact of the sleeve-spool.

The proposed bellows valve is repaired as follows:

After removing the cover-rack of the drive and removing the bellows assembly, the surface condition of the friction pair of the sleeve-spool is defected, namely, the degree of wear of the inner surface of the sleeve as a result of the contact with it of the wear surface of the annular surfacing from wear-resistant material on the spool is determined.

If there is unacceptable wear on the inner surface of the sleeve, it is removed by the lower end and a light sleeve fits a new sleeve into the body, after which the entire bellows valve is assembled.

As a result of the large specified difference in the hardness of the liner and annular surfacing on the spool, the spool surfaces are practically not subject to wear, and valve repair can be quickly performed without removing or cutting the valve from the pipeline.

The proposed design of the bellows valve ensures reliable achievement of the technical result - increased maintainability as a result of reducing the time and laboriousness of the repair by eliminating the wear of the bellows housing due to the use of a thin-walled, replaceable liner that works only for wear and wear rings of wear-resistant material on the surface of the shutoff body ( spool), which ultimately significantly increases the reliability of the valve and Provides the ability to increase the tightness of the bellows valve after repair without replacing the shut-off element.

Thus, all the essential features of the utility model are in a causal relationship with the technical result obtained from the use of the utility model.

Specific materials, design features and manufacturing techniques for the bellows valve and / or its individual parts are selected in the usual way with respect to specific operating conditions.

The manufacture of prototypes and their testing in real production conditions showed a confident solution to the problem and achieve the desired technical result.

As individual elements and assemblies of the proposed bellows valve, various technologies, materials, and structural solutions commonly known in the technology of pipeline valves that are commonly used in the manufacture of valves for the chemical, energy, oil and gas, and other industries can be used.

The analysis also shows that all the general and particular features of the utility model are essential, since each of them is necessary, and all together they are not only sufficient to achieve the goal of the utility model, but also allow you to implement the utility model in an industrial way.

Given the novelty of the essential features, the technical solution of the problem, the materiality of all general and particular features of the utility model, proven in the section "prior art" and "Disclosure of a utility model", proven in the section "Implementation of a utility model" technical feasibility and industrial applicability of the utility model, successful the solution of the problem and the confident achievement of the required technical result in the implementation and use of the utility model, in our opinion, the claimed utility model satisfied es the all the requirements for eligibility requirements for a utility model.

Claims (8)

1. A bellows valve containing a body with nozzles for supplying and discharging a working medium, a cover, a bellows-sealed rod and a locking element in the form of a slide valve movably attached to the rod, characterized in that a sleeve is installed inside the case with a light-press fit to move the slide valve on it, on the surface at the contact points of the spool with the sleeve, annular surfacing is made of wear-resistant material, and through holes are made in the side walls of the sleeve, communicating with the recesses on the outer surface ti sleeve, made with the possibility of providing flow of the working medium in the space nadzolotnikovogo discharge pipe working fluid when the spool is moved within the sleeve when the valve is opened and / or heating of the working medium in nadzolotnikovom space. 2. The bellows valve according to claim 1, characterized in that the sleeve is made of thin-walled, not subject to torsional forces and working internal surface for wear at the points of contact with the spool. 3. The bellows valve according to claim 1, characterized in that the spool is attached to the stem by means of a diametrical hole in the lower part of the stem, two diametrical holes in the side walls of the spool and a mating pin. 4. The bellows valve according to claim 1, characterized in that the diametrical holes in the side walls of the spool are made located between the annular weld deposits of wear-resistant material. 5. The bellows valve according to claim 1, characterized in that it contains a mechanical actuator, an electric actuator, a hydraulic actuator, an electromagnetic actuator, a pneumatic actuator or a quick-acting piston pneumatic actuator. 6. The bellows valve according to claim 1, characterized in that the cover is made in the form of a rack-cover with the possibility of connecting a drive to it. 7. The bellows valve according to claim 1, characterized in that it is made of corrosion-resistant steel, for example, steel 08X18H10T. 8. The bellows valve according to claim 1, characterized in that the annular deposition on the surface of the spool at the points of contact of the spool with the sleeve is made of material TsN-6 or TsN-12M or other wear-resistant material.

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