RU2802684C1 - Disc valve with triple eccentricity - Google Patents

Abstract

FIELD: pipeline valves.

SUBSTANCE: rotary butterfly valve with triple eccentricity contains a housing in which a seat with a sealing surface is placed, and a valve in the form of a disk mounted on a drive shaft installed in the housing on bearings perpendicular to the axis of symmetry of its through hole with an offset relative to the specified axis, while the seat is made removable in the form of a metal ring and is equipped with a means of its fixation from axial movement and elastic elements. The housing is made with an inspection window, closed by a lid. Drive shaft is with an elongated shaft cover, on which an anti-drip plate is installed. The drive shaft is mounted in a housing with bearings and with a shaft cover bearing. Means for fixing the seat are made in the form of an internal stop in the housing on one side and a ring fixed with a retaining ring on the other side. The seat is secured against axial movement by tightening the screws so that the ring rests against the retaining ring and the seat rests against the internal stop of the body. The sealing surface of the seat in contact with the O-ring has increased wear resistance due to the hardening wear-resistant layer applied to it. The ring seal is made in the form of a stacked seal, consisting of stainless steel rings, between which graphite rings are installed, and is installed in a disk fixed by a clamping ring, in the holes of which screws with spring washers are installed. Graphite gaskets are used in the seals housing - inspection window cover, housing - seat, disc - ring seal, housing - shaft cover, housing - bottom cover. Springs are used in the design of the gland assembly. The position of the disk relative to the shaft is fixed from rotation by keys, from axial movement - by an installed axle with a lock washer and nut. The position of the drive shaft relative to the housing is fixed by a thrust washer with screws installed from the end of the shaft, a sliding washer and a bottom cover with a graphite gasket. The housing is fitted with a sliding washer made of stainless steel coated with polymer tetrafluoroethylene (PTFE). Parts of the butterfly valve are made of materials that ensure its performance during operation in the temperature range from minus 200 to 350 degrees Celsius.

EFFECT: improving reliability by ensuring the tightness of the seal between the seat and the housing when the medium flow is directed to the disk from the side of the seal, reducing maintenance time by eliminating the dismantling of the product and carrying out repair work on the pipeline.

1 cl, 8 dwg

Description

The invention relates to pipeline fittings and can be used in the gas, oil, and chemical industries.

The claimed technical solution considers a rotary butterfly valve with triple eccentricity with a movable seat, a metal-to-metal seal, connection to a pipeline and the type of control can be any.

A known butterfly valve with triple eccentricity contains a housing with a seat placed in it and a disc-shaped valve secured to the drive shaft through pins and installed in the housing, an o-ring fixed through a sealing gasket and bolted connections to the disk, characterized in that the o-ring it is made of pressure and has a disc-shaped shape with an outer bend towards the disk, elements (MPC RU 205094 U1 published on March 19, 2022).

The disadvantages of this butterfly valve are: insufficient reliability of the tightness of the seal due to the lack of surfacing on the sealing part of the body, insufficient reliability of the tightness of the disc sealing ring, sealing gasket and disk when the flow of the medium is directed from the side of the gap between the sealing disk ring and the disk, that is, from the side of the drive shaft. To ensure tightness in this connection, it is necessary to ensure uniform tightening of the O-ring mounting bolts to ensure the tightness of the connection. Also, during operation of the shutter, it is possible for the bolts securing the sealing disc ring to self-unscrew, since the design does not include spring washers (grower) or any other design solution.

A rotary butterfly valve with triple eccentricity is known (patent RU 2695551, MPK F16K 1/22, publ. 07/24/2019, IRMASH LLC), containing a housing in which a removable seat with a sealing surface is located, and a disc-shaped valve mounted on a drive shaft installed in the housing on supports perpendicular to the symmetry axis of its through hole with an offset relative to the specified axis. The seat is installed with the possibility of limited axial movement within the gap δ=S-T, where S is the distance between the internal and external stops along the valve axis, T is the thickness of the seat, on the contact surface with which two radial elastic rings and one end elastic ring are installed , which is installed in the interface between the seat and the outer stop. All elastic rings are made of polymer materials to ensure contact between the disc seal and the seat when fully compressed to the limiting state of the end elastic ring. The cross-sectional profile of elastic rings is an array with a curved outer surface or an array within the boundaries of a polygon.

This technical solution has a set of features that is closest to the set of essential features of the invention, it has a purpose that coincides with the purpose of the invention, and is the closest in terms of the achieved result, therefore it is accepted as a prototype.

The disadvantages of this butterfly valve are: insufficient reliability due to loss of tightness in the place where the seat is sealed to the body when the medium flow is directed to the disk from the seal side, the operability of the sealing rings is ensured at a temperature not lower than minus 60°C, lack of maintainability without dismantling the product due to the lack of inspection window for replacing seals.

The technical result from the use of the invention is to increase reliability by ensuring the tightness of the seat seal with the body when directing the flow of medium to the disk from the seal side, reducing maintenance time by eliminating the dismantling of the product and carrying out repair work on the pipeline.

Disclosed below are general and specific essential features of the invention, characterizing their cause-and-effect relationship with the specified technical result, sufficient for implementation by a specialist in this field of technology.

The technical result of the claimed invention is achieved by the fact that in a rotary butterfly valve with triple eccentricity, containing a housing in which a seat with a sealing surface is located, and a disc-shaped valve mounted on a drive shaft mounted in the housing on bearings perpendicular to the symmetry axis of its bore with offset relative to the specified axis, while the seat is made removable in the form of a metal ring and is equipped with a means of fixing it from axial movement and elastic elements, according to the invention, the body is made with an inspection window closed by a lid, the drive shaft is equipped with an elongated shaft cover on which an anti-drip device is installed plate, the drive shaft is installed in a housing with bearings and with a shaft cover bearing, the specified means of fixing the seat are made in the form of an internal stop in the housing on one side and a ring secured with a locking ring, on the other hand, the seat is secured from axial movement by tightening screws, so so that the ring rests against the retaining ring, and the seat rests against the internal stop of the body, the sealing surface of the seat in contact with the ring seal has increased wear resistance due to a reinforcing wear-resistant layer applied to it, the ring seal is made in the form of a stacked seal consisting of stainless steel rings, between with which graphite rings are installed, and installed in a disk, fixed by a clamping ring, in the holes of which screws with spring washers are installed, in the seals body - inspection window cover, body-seat, disk - ring seal, body - shaft cover, body - bottom cover are used gaskets are made of graphite, springs are used in the design of the stuffing box assembly, the position of the disk relative to the shaft is fixed from rotation by keys, from axial movement - by an installed axis with a lock washer and nut, the position of the drive shaft relative to the housing is fixed by a thrust washer with screws installed at the end of the shaft, a sliding washer and a lower cover with a graphite gasket, a sliding washer made of stainless steel coated with polymertetrafluoroethylene (PTFE) is installed in the body, while the parts of the rotary butterfly valve are made of materials that ensure its performance during operation in the temperature range from minus 200 to 350 degrees Celsius Celsius.

Due to the fact that the housing is made with an inspection window closed by a lid, the drive shaft is made with an elongated shaft cover on which an anti-drip plate is installed, the drive shaft is installed in a housing with bearings and with a shaft cover bearing, the specified means of fixing the seat are made in the form of an internal stop in the body on one side and the ring fixed with a retaining ring on the other side, the seat is secured against axial movement by tightening the screws so that the ring rests against the lock ring, and the seat rests against the internal stop of the body, the sealing surface of the seat in contact with the ring seal has an increased wear resistance due to a hardening wear-resistant layer applied to it, the ring seal is made in the form of a stacked seal consisting of stainless steel rings, between which graphite rings are installed, and is installed in a disk, fixed by a pressure ring, in the holes of which screws with spring washers are installed, in the seals body-cover inspection window, body-seat, disc-ring seal, body-shaft cover, body-bottom cover, graphite gaskets are used, springs are used in the design of the stuffing box assembly, the position of the disk relative to the shaft is fixed from rotation by keys, from axial movement - by installed an axis with a lock washer and a nut, the position of the drive shaft relative to the housing is fixed by a thrust washer with screws installed at the end of the shaft, a sliding washer and a lower cover with a graphite gasket, a sliding washer made of stainless steel coated with polymer tetrafluoroethylene (PTFE) is installed in the housing, At the same time, the parts of the butterfly valve are made of materials that ensure its operability during operation in the temperature range from minus 200 to 350 degrees Celsius, reliability is increased by ensuring the tightness of the seal of the seat with the body when directing the flow of medium to the disk from the seal side, the maintenance time for by eliminating the dismantling of the product and carrying out repair work on the pipeline.

The invention is illustrated by drawings, where:

in fig. 1 - rotary butterfly valve with triple eccentricity, schematic diagram of the arrangement of the disk with triple eccentricity;

in fig. 2 - the same, longitudinal section of the shutter;

in fig. 3 - the same, side view;

in fig. 4 - the same, remote element A, version I in Fig. 2;

in fig. 5 - the same, remote element A, version II in Fig. 2;

in fig. 6 - the same, remote element B in Fig. 2;

in fig. 7 - the same, remote element In execution I in Fig. 2;

in fig. 8 - the same, remote element In execution II in Fig. 2.

In the example design, a triple eccentricity disk valve (Fig. 2) includes a body 1 with an inspection window, closed by a lid 2 of the inspection window with fasteners 3 (Fig. 3), in which a seat 4 with a sealing surface is located, and a valve in the form disk 5, mounted on the drive shaft 6, installed in the housing 1 on bearings 7 and on the bearing 8 of the shaft cover 9 perpendicular to the axis of symmetry of its through hole with an offset relative to the specified axis. The saddle 4 is made removable (Fig. 4) in the form of a metal ring and is equipped with a means of fixing it from axial movement and elastic elements. The shaft cover 9 is made elongated, on which an anti-drip plate 10 is installed (Fig. 3). The drive shaft 6 is installed in a housing 1 with bearings 7 and a shaft cover 9 with a bearing 8. The specified means of fixation (Fig. 4) of the seat 4 are made in the form of an internal stop 11 in the housing 1 on one side and a ring 12 secured with a retaining ring 13 on the other sides. The seat 4 is secured against axial movement by tightening the screws 14, so that the ring 12 rests against the retaining ring 13, and the seat 4 rests against the internal stop 11 of the body 1. The sealing surface 15 of the seat 4, in contact with the ring seal 16, has increased wear resistance due to the below the stellite layer. The ring seal 16 is made of hardened stainless steel (Fig. 4); it is also possible to make it in the form of a stacked seal (Fig. 5), consisting of stainless steel rings, between which graphite rings are installed. O-ring seal 16 installed in disk 5, fixed by a clamping ring 17, in the holes of which screws 18 with spring washers 19 are installed. In the seals, housing 1 - inspection window cover 2, housing 1 - seat 4, disk 5 - ring seal 16, housing 1 - shaft cover 9, housing 1 - bottom cover 20, graphite gaskets 21, 22, 23, 24, 25 were used, respectively. In the design of the stuffing box unit (Fig. 8), springs 26 were used. The position of the disk 4 relative to the drive shaft 6 (Fig. 3) was fixed from rotation by keys 27, from axial movement by an installed axis 28 with a lock washer 29 and a nut 30. The position of the drive shaft 6 relative to the housing (Fig. 6) was fixed by a thrust washer 31 with screws 32 installed at the end of the drive shaft 6, a sliding washer 33 and a lower cover 20 with a graphite gasket 25. A sliding washer 33, made of stainless steel coated with polymer tetrafluoroethylene ( PTFE), it is also possible to manufacture the sliding washer 33 from stainless steel, or fluoroplastic, or PTFE. The parts of the butterfly valve are made of materials that ensure its performance during operation in the temperature range from minus 200 to 350 degrees Celsius.

In fig. 1 shows: offset see 1 - shaft placed behind the sealing surface to have a continuous seat path, offset see 2 - shaft positioned on one side of the valve centerline to force the seal out of the seat when opening 90°, offset see 3 - axial The seat and body seal lines are inclined relative to the centerline of the valve to eliminate friction in the seal. Friction of the sealing surfaces occurs only in the final closing position of the valve. This minimizes their wear and reduces operating torque, and also increases the service life of the product.

Disc 5 is used as a locking element in the bolt (Fig. 4, Fig. 5). In the disk 5 along the outer diameter there is a recess for installing an o-ring seal 16 made of stainless steel coated with stellite or a multilayer seal made of stainless steel and graphite. This o-ring 16 is pressed against disk 5 by ring 12. This design provides a bi-directional seal.

The tightness of the connection housing 1 - inspection window cover 2 is ensured by a graphite gasket 21, housing 1 - seat 4 - by a graphite gasket 22, connection disk 5 - ring seal 16 - by a graphite gasket 23, housing 1 - shaft cover 9 - by a graphite gasket 24 , lower body-cover - with a graphite gasket 25.

The ring seal 16 is attached with screws 18 with spring washers (grovers) 19 to the disk 5 by means of a clamping ring 17 (Fig. 4, Fig. 5). The ring seal 16 is made of hardened stainless steel (Fig. 4); it is also possible to make it in the form of a stacked seal consisting of stainless steel rings, between which graphite rings are installed (Fig. 5).

The tightness of the drive shaft 6 is ensured by the stuffing box assembly (Fig. 7 and Fig. 8). Between shaft 6 and shaft cover 9, a bearing 8 is installed, then graphite rings (stuffing box packing) 34, which are pressed by an oil seal bushing 35. The oil seal bushing 35 is pressed by a flange 36, the mating surfaces of the flange 36 and the oil seal bushing 35 are spherical in shape to ensure self-centering. Tightening is carried out by means of studs 37 with nuts 38 (Fig. 7). A version with springs 26 is possible (Fig. 8). It is also possible to design with the installation of two bearings 8, between which a spring is installed, instead of springs 26.

For cryogenic and fire-resistant design, the shaft cover 9 is made elongated, and an anti-drip plate 10 (Fig. 3) is installed to protect the stuffing box seal from cooling and overheating, as well as the formation of condensation in the stuffing box assembly. The shaft cover 9 is made elongated to ensure the temperature in the stuffing box is not lower than 0 and not higher than 45 degrees Celsius.

Assembly order

Disk assembly 5. A graphite gasket 23 is installed in the groove of the disk 5, then an o-ring seal 16 is installed. To fix the o-ring seal 16, a pressure ring 17 is installed, into the holes of which screws 18 with spring washers 19 are installed. Screws 18 are tightened evenly around the circumference crosswise. to ensure uniform pressing of the o-ring seal 16 to the disk 5.

The disk 5 assembled with an ring seal 16 is inserted into the housing 1 through an inspection window, then the drive shaft 6 with installed keys 27 is inserted into the hole of the housing 1 and installed in the holes of the disk 5. An axis 28 with a lock washer 29 and a nut are installed into the disk 5 through the shaft 6 30 to fix the position of shaft 6 relative to disk 5.

From the inspection window side, bearing 7 is installed on shaft 6, then on shaft 6, bearing 7 is installed in housing 1. Next, gasket 24 is installed in housing 1. Shaft cover 9 is installed on shaft 6. Shaft cover 9 is attracted to housing 1 by fasteners 39 with uniform compressing gasket 24.

A bearing 7 is also installed through the lower hole of the housing 1 and then pressed with a thrust washer 31, which is fastened with screws 32 to the end of the shaft 6. Next, a sliding washer 33 is installed (it has a groove for the heads of the screws 33). Tightness is ensured by installing the bottom cover 20 with a graphite gasket 25 and uniform compression of the fasteners 40.

At the end of the shaft cover 9 from the side of the drive shaft 6, studs 37 are installed. From the side of the shaft cover 9, a bearing 8 is installed on the drive shaft 6, which is installed in the shaft cover 9. Next, graphite rings (oil packing) 34 are installed, then the oil seal bushing 35 A flange 36 is installed on the studs 37, then springs 26 and nuts 38. The oil seal sleeve 35 is pressed by the flange 36 by uniformly tightening the nuts 38.

Disc 5 in housing 1 is brought to the closed position. Through the inspection window of body 1, seat 4 with gasket 22 is installed to the internal stop 11 of body 1. Next, ring 12 and retaining ring 13 are installed in the groove of body 1. There should be no gap between seat 4 and internal stop 11 of body 1. To do this, it is necessary to evenly tighten the first row of screws 14 into the ring 12. In this case, the seat 4 will be pressed against the internal stop 11 of the body 1, and the ring 12 will rest against the locking ring 13. Then the second row of screws 14 is installed in the ring 12 to prevent them from unscrewing during operation of the shutter . The position of the seat 4 relative to the body 1 is ensured by guide grooves or pins. After this, gasket 21 is installed in body 1, then inspection window cover 2 is installed on body 1. Inspection window cover 2 is attracted to body 1 by fasteners 3 with uniform compression of gasket 21. The shutter is disassembled in the reverse order.

The claimed invention increases reliability by ensuring the tightness of the seat seal with the housing when directing the flow of medium to the disk from the seal side, reduces maintenance time by eliminating the dismantling of the product and carrying out repair work on the pipeline, due to the fact that the housing is made with an inspection window that is closed by a lid, driven shaft - with an elongated shaft cover on which an anti-drip plate is installed, the drive shaft is installed in a housing with bearings and with a shaft cover bearing, the specified means of fixing the seat are made in the form of an internal stop in the housing on one side and a ring fixed with a locking ring on the other side, the seat is secured against axial movement by tightening the screws so that the ring rests against the retaining ring, and the seat rests against the internal stop of the body, the sealing surface of the seat in contact with the ring seal has increased wear resistance due to a reinforcing wear-resistant layer applied to it, the ring seal is made in the form stacked seal, consisting of stainless steel rings, between which graphite rings are installed, and installed in a disk, fixed by a pressure ring, in the holes of which screws with spring washers are installed, in the seals body-cover of the inspection window, body-seat, disk-ring seal, graphite gaskets are used in the housing-shaft cover, housing-bottom cover, springs are used in the design of the stuffing box assembly, the position of the disk relative to the shaft is fixed from rotation by keys, from axial movement by an installed axis with a lock washer and nut, the position of the drive shaft relative to the housing is fixed by a thrust washer with screws installed at the end of the shaft, a sliding washer and a lower cover with a graphite gasket, a sliding washer made of stainless steel coated with polymertetrafluoroethylene (PTFE) is installed in the body, while the parts of the butterfly valve are made of materials that ensure its performance during operation in the temperature range from minus 200 to 350 degrees Celsius.

Claims (1)

A rotary butterfly valve with triple eccentricity, containing a housing in which a seat with a sealing surface is located, and a valve in the form of a disk mounted on a drive shaft installed in the housing on bearings perpendicular to the symmetry axis of its passage hole with an offset relative to the specified axis, while the seat is made removable in the form of a metal ring and equipped with a means of fixing it from axial movement and elastic elements, characterized in that the housing is made with an inspection window closed by a lid, the drive shaft is equipped with an elongated shaft cover on which an anti-drip plate is installed, the drive shaft is installed in a housing with bearings and with the shaft cover bearing, the specified means of fixing the seat are made in the form of an internal stop in the body on one side and a ring fixed with a locking ring, on the other hand, the seat is secured against axial movement by tightening the screws so that the ring rests against the locking ring, and the seat rested against the internal stop of the body, the sealing surface of the seat in contact with the ring seal has increased wear resistance due to a reinforcing wear-resistant layer applied to it, the ring seal is made in the form of a stacked seal consisting of stainless steel rings, between which graphite rings are installed, and installed in the disk, fixed by a pressure ring, in the holes of which screws with spring washers are installed, in the seals body - inspection window cover, body-seat, disk - ring seal, body - shaft cover, body - bottom cover, graphite gaskets are used, in the design of the stuffing box the unit uses springs, the position of the disk relative to the shaft is secured from rotation by keys, from axial movement - by an installed axis with a lock washer and nut, the position of the drive shaft relative to the housing is fixed by a thrust washer with screws installed at the end of the shaft, a sliding washer and a lower cover with a graphite gasket , a sliding washer made of stainless steel coated with polymer tetrafluoroethylene (PTFE) is installed in the body, while the parts of the rotary butterfly valve are made of materials that ensure its performance during operation in the temperature range from minus 200 to 350 degrees Celsius.