CN110388472A - Telescopic Butterfly Valve - Google Patents

Abstract

The invention discloses a telescopic butterfly valve, which includes a valve body, a valve shaft, a valve plate, a valve plate sealing ring, a valve body sealing surface and a telescopic part. It is fixed on the butterfly plate, and the pressure plate screws are distributed horizontally around the valve plate. There is a conical double-ear stop washer between the adjustment pressure plate and the pressure plate screws. The conical double-ear stop washer includes the outer diameter of the nut of the pressure plate screw Matched conical cylinder, the large surface of the conical cylinder has long ears and short ears, the long ear fits on the nut of the pressure plate screw, and the short ear fits on the outer edge of the adjustment pressure plate. The beneficial effect of the present invention is that by adjusting the tightening torque of the pressure plate screw, the interference of the sealing ring of the valve plate and the sealing surface of the valve body in the circumferential direction is adjusted to keep the valve sealed; The pre-tightening force exerted by the sealing ring fully acts on the bottom surface of the telescopic sealing ring to ensure the sealing effect.

Description

Telescopic Butterfly Valve

technical field

The invention relates to the field of valves, in particular to telescopic butterfly valves.

Background technique

As a control element connected to the pipeline equipment, the telescopic butterfly valve combines the expander and the butterfly valve into one, and its full diameter realizes the large flow requirement of the pressure pipeline components. For example, the Chinese Utility Model Patent Publication No. CN204985763U discloses a position-limiting telescopic butterfly valve, which includes a butterfly valve body, a telescopic tube installed on the butterfly valve body, a sealing ring and a pressure plate sleeved on the outside of the telescopic tube, and a sealing groove is provided inside the pressure plate. , the sealing ring is located in the sealing groove, the pressure plate and the butterfly valve body are locked and fixed by screws, the outer side of the telescopic tube is provided with a flange, and the flange and the butterfly valve body are located at opposite ends of the telescopic tube, the Lugs integrally formed with the telescopic tube are also provided on the outer side of the telescopic tube, and the lugs are located between the pressure plate and the flange. It includes the valve part and the telescopic part. The butterfly plate (valve plate) of the butterfly valve and the valve body realize the sealing pair through the cooperation of the sealing ring and the sealing surface of the valve body. The sealing ring is generally fixed on the butterfly plate by adjusting the pressure plate. The existing adjusting pressure plate is generally directly fixed on the butterfly plate by screws, and the screw will easily loosen or even fall off after repeatedly adjusting the pre-tightening force on the adjusting pressure plate, which will affect the pre-tightening pressure of the adjusting pressure plate on the sealing ring; the telescopic part includes The telescopic gland, telescopic gland, telescopic screw and valve body connecting flange, the sealing performance between telescopic gland, telescopic pipe and valve body connecting flange is also an important indicator, how to ensure the connection between telescopic gland, telescopic pipe and valve body The sealing between the flanges is also a problem waiting to be solved.

Contents of the invention

The technical problem to be solved by the present invention is at least one of the above-mentioned problems, and a telescopic butterfly valve is provided for this purpose.

The technical solution of the present invention is: a telescopic butterfly valve, which includes a valve body, a valve shaft, a valve plate, a valve plate sealing ring, a valve body sealing surface, a valve shaft and a telescopic piece, and the valve plate sealing ring is fixed on the valve plate by adjusting the pressure plate Above, the adjusting pressure plate is fixed on the butterfly plate by several pressure plate screws, and the pressure plate screws are distributed horizontally around the valve plate. A conical double-ear stop washer is arranged between the adjustment pressure plate and the pressure plate screws. The ear-type stop washer includes a conical cylinder adapted to the outer diameter of the nut of the pressure plate screw. The large surface of the conical cylinder has long ears and short ears, and the long ear fits on the nut of the pressure plate screw. , the short ear fits on the outer edge of the adjusting pressure plate.

In the above scheme, the linear distance between two adjacent platen screws is 6-8 times the nominal diameter of the platen screws.

The improvement of the above solution is that an internally threaded hole is provided on the adjusting pressure plate between two adjacent pressure plate screws, and the internal thread of the internally threaded hole is equipped with a set screw in contact with the butterfly plate.

In the above solution, the telescopic member includes a telescopic tube, a telescopic gland, a telescopic screw rod and a valve body connecting flange, and the telescopic tube includes a standard flange and a pipe body concentrically fixed on the standard flange, and the standard flange A circle of staggered telescopic screw through holes and flange holes are evenly distributed on the circumferential surface of the valve body. A circle of outwardly extending protrusions is distributed on the outer edge of the circumferential surface of the connecting flange of the valve body. The protrusions are provided with The telescopic screw through hole, the protrusion is located between two adjacent flange holes, the inner edge of the peripheral surface of the valve body connection flange has a valve body connection flange sealing surface, the valve body connection flange There is also a ring of telescopic gland fastening holes distributed on the middle part of the circumferential surface, and the telescopic screw includes a first threaded part that is threadedly matched with the telescopic screw through hole of the telescopic tube, a cylindrical part, and a telescopic screw through hole that is connected to the valve body flange. The second threaded portion of the threaded hole is threaded, and the telescopic gland is threadedly connected with the fastening hole of the telescopic gland of the connecting flange of the valve body through bolts.

A further improvement of the above solution is that cotter pins are provided at the ends of the two threaded parts.

A further improvement of the above solution is that a telescopic sealing ring is provided between the telescopic gland, the pipe body and the connecting flange of the valve body, and the telescopic sealing ring is in contact with the contact surface of the pipe body and the telescopic sealing ring is in contact with the connecting flange of the valve body. Protrusions are respectively arranged on the surface, so that the telescopic sealing ring is in interference fit with the connecting flange of the pipe body and the valve body.

The cross-section of the telescopic sealing ring in the above scheme is a right-angled trapezoid, its inclined surface and upper bottom surface are in contact with the telescopic gland, its lower bottom surface is in contact with the pipe body, and its right-angled surface is in contact with the connecting flange of the valve body. The contact point of the cover is located at the bottom of the slope, and an angle of 2°-5° is formed between the slope and the telescopic gland in the direction of the upper bottom surface of the right-angled trapezoid with the contact point as the apex.

In the above scheme, the valve shaft includes an upper valve shaft and a lower valve shaft, the upper valve shaft is provided with an upper shaft shoulder, and the upper shaft shoulder is provided with a sealing sleeve and a sealing gland, and the sealing sleeve and the upper shaft The shoulder is clearance fit in the vertical direction, the lower valve shaft is provided with a lower shoulder, the bottom of the lower shoulder is in contact with the end cover fixed at the bottom of the valve body, and the lower shoulder is clearance fit with the valve body in the vertical direction .

In the above solution, the upper valve shaft and the lower valve shaft are respectively connected to the valve plate through the valve plate pin.

The beneficial effect of the invention is to adjust the circumferential interference between the sealing ring of the valve plate and the sealing surface of the valve body by adjusting the tightening torque of the pressure plate screw, so as to keep the valve sealed. A circle of pressure plate screws is evenly distributed on the adjustment plate, and the straight-line distance between two adjacent pressure plate screws is 6 to 8 times the nominal diameter of the pressure plate screws. Each pressure plate screw is equipped with a conical double-ear stop washer to The screw of the anti-pressure plate is loose and dropped, and the contact mode between the telescopic sealing ring and the telescopic gland makes the pre-tightening force exerted by the telescopic gland on the telescopic sealing ring fully act on the bottom surface of the telescopic sealing ring to ensure the sealing effect; adjust the pressure plate and the set screw to cooperate , which not only fixes the position of the adjusting pressure plate, but also ensures the circumferential interference between the sealing ring of the valve plate and the sealing surface of the valve body, and produces a pre-tightening force.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a structural schematic diagram of the connecting flange of the valve body of the present invention;

Fig. 3 is a schematic structural view of the telescopic tube of the present invention;

Fig. 4 is a schematic diagram of the full-bore structure of the present invention;

Fig. 5 is a schematic diagram of the hanging structure of the upper shaft valve of the present invention;

Fig. 6 is a schematic diagram of the lower top structure of the lower shaft valve of the present invention;

Fig. 7 is a schematic diagram of the structure of the upper hanging lower top of the present invention;

Fig. 8 is a schematic diagram of the anti-loosening structure of the pressure plate screw on the adjustment pressure plate of the present invention;

Fig. 9 is a structural schematic diagram of a conical double-ear stop washer of the present invention;

Fig. 10 is a schematic diagram of the use structure of the conical double-ear stop washer of the present invention;

Fig. 11 is a schematic diagram of the anti-loosening structure of the pressure plate screw on the adjustment pressure plate of the present invention;

Fig. 12 is a schematic diagram of the telescopic screw structure of the present invention;

Fig. 13 is a structural schematic diagram of the telescopic sealing ring of the present invention;

Fig. 14 is a schematic structural diagram of the standard installation position of the limit telescopic butterfly valve of the present invention;

Fig. 15 is a schematic diagram of the L-△L position structure of the limit telescopic butterfly valve of the present invention;

Fig. 16 is a schematic diagram of the L+△L position structure of the limit telescopic butterfly valve of the present invention;

Fig. 17 is a schematic diagram of cooperation between the telescopic sealing ring and the telescopic gland of the present invention;

In the figure, 1 driving device, 2 flat key, 3 bracket, 4 upper valve shaft, 5 sealing sleeve gland, 6 sealing sleeve, 7 valve body, 8 adjusting pressure plate, 9 valve plate sealing ring, 10 pin shaft, 11 valve plate , 12 lower valve shaft, 13 end cover, 14 telescopic sealing ring, 15 telescopic gland, 16 telescopic tube, 17 telescopic screw, 18 valve body connection flange, 19 flange hole, 20 protrusion, 21 telescopic screw through hole, 22 telescopic gland fastening hole, 23 valve body connecting flange sealing surface, 24 protruding outer circle, 25 protruding inner circle, 26 flange hole center circle, 27 protruding side, 28 valve shaft centerline, 29 protruding Starting plane, 30 standard flange, 31 pipe body, 32 limited expansion screw threaded through hole, 33 inner passage diameter of inlet flange end, 34 inner passage diameter of outlet flange end, 35 shaft shoulder, 36 shaft shoulder in contact with valve body 37 valve body sealing surface, 38 conical double ear stop washer, 39 pressure plate screw; 40 conical cylinder; 41 long lug; 42 short lug; 43 set screw; 44 adjust pressure plate contact sealing ring side; 45 internal thread hole ;46 Valve plate plane; 47 First threaded part; 48 Cylindrical part; 49 Plane; 50 Second threaded part; ; 56 first nut; 57 cotter pin; 58 bolt; 59 second nut; 60 valve body limit surface.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments without creative efforts by those skilled in the art fall within the protection scope of the present invention.

The telescopic butterfly valve includes a valve body 7, a valve shaft, a valve plate 11, a valve plate sealing ring 9, a valve body sealing surface 37, and a bracket 3.

As shown in Figure 1-2, the valve body connecting flange 18 is designed to have a circle of outwardly extending protrusions distributed on the outer edge of its peripheral surface, each protrusion is located between two flange holes 19, and the protrusions The number of 20 is half of the number of flange holes 19, and they are distributed symmetrically with respect to the central line 28 of the valve shaft. The size of the raised outer circle 24 is the size of the standard flange outer circle, the size of the raised inner circle 25 is the size of the center circle of the flange hole 26 minus the size of the flange hole 19, and the angle α between the two raised sides 27 is 40-45°. The chord length d of two intersections between the raised side 27 and the adjacent flange hole 19 on the center circle 26 of the flange hole is 8-12 mm. Each protrusion 20 is drilled with a telescopic screw through-hole 21 , and the telescopic screw through-hole 21 is on the center circle 26 of the flange hole, and is located in the middle of two adjacent flange holes 19 of the protrusion 20 . A circle of telescopic gland fastening holes 22 is evenly distributed on the raised plane 29 , and the valve body connecting flange sealing surface 23 is in contact with the telescopic sealing ring 14 .

As shown in Figure 13, the cross-sectional shape of the telescopic sealing ring 14 is a right-angled trapezoid, and two bulges 54 with a radius of 0.5 mm are evenly distributed on the matching surface 52 with the telescopic tube, and two bulges 54 with a radius of 0.5 mm are evenly distributed on the matching surface 53 with the valve body. The bulge 54 has two contact surfaces between the telescopic gland and the telescopic sealing ring. One surface is inclined to match the inclined surface and can be called a matching inclined surface, and the other surface is parallel to the upper bottom surface of the telescopic sealing ring and can be called a matching plane. The angle β between the inclined surface 55 of the telescopic gland and the valve body mating surface 53 is 30°, as shown in Figure 17, the contact point between the inclined surface of the telescopic sealing ring and the telescopic gland is located at the bottom of the inclined surface, and the contact point is the apex A certain angle is formed between the inclined surface toward the upper bottom of the right-angled trapezoid and the telescopic gland. From a mechanical point of view, the lower the contact point between the inclined surface 55 and the mating inclined surface, the pretightening force provided by the telescopic gland to the telescopic sealing ring. The larger the size, the more reliable the telescopic sealing ring can be attached to the surface of the pipe body, improving the sealing performance. If the inclination perfectly matches the inclination of the mating inclined surface, then the pretightening force given to the telescopic sealing ring by the telescopic gland will be dispersed, so this The invention realizes the reliable sealing of the telescopic sealing ring through the shape design of the telescopic sealing ring and the matching design with the telescopic gland.

As shown in Figure 3, the telescopic tube includes a standard flange 30 and a pipe body 31 concentrically fixed on the standard flange. On the standard flange 30, a circle of limiting telescopic screw threaded through holes 32 is evenly distributed, and the limiting telescopic screw The number of threaded through holes 32 is half of the number of flange holes 19 , and the threaded through holes 32 of the limit expansion screw are on the center circle 26 of the flange holes, and are located in the middle of two adjacent flange holes 19 . As shown in Figure 4, the pipe body is a standard seamless steel pipe, and the standard flange 30 is welded to the pipe body to ensure that the diameter of the inner channel at the inlet flange end is 33 as the nominal diameter of the valve, and the diameter of the inner channel at the outlet flange end of the valve body 7 34 is the nominal diameter of the valve at the time of product design, and the inlet and outlet of the valve are both nominal diameters, that is, full bore.

As shown in Figure 5, the retractable butterfly valve adopts an upper and lower two-stage valve shaft structure. Corresponding shoulders 35 are provided on the upper valve shaft and the lower valve shaft. The upper valve shaft 4 has an upper shoulder. The upper end is equipped with a sealing sleeve 6 and a sealing gland 5. At this time, the upper valve shaft 4 is in the upper limit of the valve shaft centerline 28 direction. In order to prevent the sealing sleeve 6 from pressing the upper shaft shoulder tightly and increase the opening and closing torque of the valve, the tolerance requirement for the height dimension H1 of the upper shaft shoulder is (-0.2～-0.1) mm, and the tolerance requirement for the height dimension H2 of the sealing sleeve 6 is (-0.1～0 ) mm, the tolerance requirement for the bore depth dimension H3 of the valve body 7 (0~0.1) mm, to ensure clearance fit.

As shown in Figure 6, the lower valve shaft 12 has a lower shoulder. After assembly, the lower shoulder and the valve body 7 have a contact surface 36 between the shoulder and the valve body. The other side of the lower shoulder is supported by the end cover 13. At this time, the lower shoulder The valve shaft 12 is limited in the direction of the centerline 28 of the valve shaft. In order to prevent the end cover 13 from tightening the lower shaft shoulder and increase the valve opening and closing torque, the tolerance requirement for the height dimension H4 of the lower shaft shoulder 35 of the lower valve shaft 12 is (-0.2～-0.1) mm, and the height dimension H5 tolerance for the end cover 13 The requirement is (-0.1～0)mm, and the tolerance requirement for the bore depth dimension H6 of the valve body 7 is (0～0.1)mm to ensure clearance fit.

As shown in Figure 7, the upper valve shaft 4 and the lower valve shaft 12 are connected to the valve plate 11 through the pin shaft 10. On the valve body 7, the valve plate 11 is supported on the end cover 13 through the lower valve shaft 12, and the two ends of the valve plate 11 are positioned in the direction of the centerline 28 of the valve shaft to ensure that the valve plate sealing ring 9 is in the circumferential direction of the valve body sealing surface 37. The uniformity of the interference prevents the valve plate 11 from falling due to its own weight, increasing the interference between the valve plate sealing ring 9 in the direction of the lower valve shaft 12 and the valve body sealing surface 37, and damaging the valve plate sealing ring 9 when the valve is opened and closed.

As shown in Figure 8, the valve plate sealing ring 9 is installed on the valve plate 11, and the adjusting pressure plate 8 is installed on the valve plate 11 through the pressure plate screw 39, and the valve plate sealing ring 9 is sealed with the valve body by adjusting the tightening torque of the pressure plate screw 39. The amount of interference in the circumferential direction of the surface 37 keeps the valve sealed. A circle of pressure plate screws 39 is evenly distributed on the adjustment pressure plate 8, and the linear distance between each adjacent two pressure plate screws 39 is 6 to 8 times the nominal diameter of the pressure plate screws 39, and each pressure plate screw 39 is equipped with a conical double ear type Stop washer 38, to prevent the pressure plate screw 39 from loosening and falling.

As shown in Figure 9, the main body of the conical double ear type stop washer 38 is a conical cylinder 40, and the inner cone size of the conical cylinder 40 is consistent with the conical size of the pressure plate screw 39 matched with it, at 180° at the large end of the conical cylinder 40 A long ear 41 and a short ear 42 are evenly distributed in the direction.

As shown in Figure 10, the assembly process of the pressure plate screw and the conical double-ear stop washer is as follows: in the first step, the pressure plate screw 39 is inserted into the conical double-ear stop washer 38, and the pressure plate screw 39 passes through the adjustment plate 8. The screw holes of the pressure plate are screwed into the corresponding threaded holes on the valve plate 8. After the pressure plate screws 39 are tightened, the long ears 41 are made to face the outer circle direction of the pressure plate 8, and the short ears 42 are made to face the inner circle direction of the pressure plate 8. In the second step, the long ear 41 is knocked into the hexagonal counterbore of the pressure plate screw 39, and fitted with a plane. In the third step, the short ear 42 is knocked into the inner circumference of the adjustment pressure plate 8 to fit the inner circumferential surface.

As shown in Figure 11, an internally threaded hole 45 for installing a hexagon socket flat-end set screw 43 is drilled in the middle of every two adjacent platen screws 39 on the adjusting platen 8. Before drilling the internally threaded hole 45, first drill the threaded bottom hole φA , and then tap the thread from the side 44 of the adjusting pressure plate contacting the sealing ring, and the tapped thread is kept 1 mm away from the tapped position to ensure that the length of the hexagonal flat end set screw 43 is less than the length of the internally threaded hole 45. Installation steps: firstly, fully screw the hexagonal flat-end set screw 43 from the side 44 of the adjusting pressure plate contacting the seal ring into the internal threaded hole 45; then, install the adjusting pressure plate 8, and screw on the pressure plate screw 39 as described in Fig. 8-10. Finally, turn the set screw 43 with the hexagonal flat end to abut on the flat surface 46 of the valve plate. The pressure plate screw 39 on the adjustment pressure plate 8 presses the adjustment pressure plate 8 to the valve plate 11, and the hexagonal flat-end set screw 43 pushes the adjustment pressure plate 8 away from the butterfly plate 11, pressing one by one, that is, the position of the adjustment pressure plate 8 is fixed, ensuring Valve plate sealing ring 9 and valve body sealing surface 37 circumferential interference amount, have produced pre-tightening force again, carry out pre-tightening force anti-loosening to pressure plate screw 39 and hexagon flat end set screw 43, and pressure plate screw 39 is also equipped with The conical double ear type stop washer 38 carries out mechanical anti-loosening, and the double anti-loosening effect guarantees that the pressure plate screw 39 is not loosened.

For the pressure plate screw on the adjustment pressure plate, the conical double-ear stop washer is used to prevent loosening, and the set screw is used to prevent loosening with a threaded mouth.

Fig. 12: The position-limiting telescopic screw 17 is mainly composed of three sections: the first threaded part 47, the cylindrical part 48; the second threaded part 50. The first threaded portion 47 is used to be screwed into the threaded through hole 32 of the limiting telescopic screw on the telescopic tube 16 , and the length H7 of the first threaded portion 47 is 3-5 mm shorter than the depth of the threaded through hole 32 of the limiting telescopic screw. The length of the cylindrical portion 48 is 25-30mm, and two planes 49 are milled on the outer circle of the cylinder 48, the plane width H10 is greater than 10mm, and the adjustable wrench can rotate it. The second threaded part 50 passes through the telescopic screw through hole 21 on the protrusion 20 of the valve body 7, the length H9 of the second threaded part 50 is determined according to the telescopic distance of the telescopic butterfly valve, and a cotter pin hole is drilled on the second threaded part 50 51. The position of the cotter pin hole 51 depends on the telescopic distance.

As shown in Figure 14, when the limit telescopic butterfly valve is installed in a standard position, its structural length is L. The dimension +ΔL is marked between the nut 59 and the cotter pin 57, which means that the telescopic tube 16 can be stretched to the outside of the valve body 7 by a distance of ΔL, and the longest structural length is L+ΔL. The dimension -△L is marked between the telescopic tube 16 and the valve body 7, which means that the telescopic tube 16 can be pushed into the valve body 7 by a distance of △L, and the shortest structural length is L-△L. Specific installation steps:

The first threaded portion 47 of the telescopic screw 17 is fully screwed into the limit telescopic screw threaded through hole 32 on the telescopic tube 16, and the first nut 56 is screwed into the second threaded portion 50 to seal the telescopic gland 15 with the telescopic seal. The ring 14 is set on the telescopic tube 16 successively, the telescopic tube 16 is inserted into the valve body 7, the second threaded part 50 passes through the telescopic screw through hole 21 on the protrusion 20 of the valve body 7, and on the second threaded part 50 Screw in the second nut 59, adjust the limit telescopic butterfly valve to the standard structural length L, tighten the first nut 56 and the second nut 59 to the protrusion 20 respectively, fix the structural length L, and install the cotter pin 57 into the second Inside the cotter pin hole 51 on the threaded part 50 . Move the telescopic sealing ring 14 to the valve body 7, so that the valve body matching surface 53 of the telescopic sealing ring 14 contacts the sealing surface 23 of the connecting flange of the valve body, the telescopic sealing ring 14 is set in the telescopic gland 15, and the telescopic gland 15 passes through The bolt 58 is fastened on the valve body 7, and the four sides of the telescopic sealing ring 14 are respectively surrounded by the telescopic gland 15, the telescopic tube 16, and the valve body 7. The tightening torque is applied to the bolt 58, and the telescopic gland 15 tightens the telescopic sealing ring 14. Extruded, the telescopic seal ring 14 is a rubber part. After extrusion deformation, a sealing ratio is formed between the telescopic seal ring 14 and the valve body connecting flange sealing surface 23, and a sealing ratio is formed between the telescopic seal ring 14 and the telescopic tube 16. Pressure, together with the four bulges 54 on the telescopic sealing ring 14, makes the sealing effect better.

As shown in Figure 15, on the basis of Figure 14, loosen the bolt 58 on the telescopic gland 15 to make the telescopic sealing ring 14 in a relaxed state, loosen the first nut 56 on the telescopic screw rod 17, and apply force to the valve body 7 Push the telescopic tube 16 inside, so that the telescopic tube 16 is pushed against the limit surface 60 of the valve body. At this time, the shortest structural length of the limit telescopic butterfly valve is L-△L, and the dimension between the second nut 59 and the cotter pin 57 is +2 ΔL. Tighten the first nut 56 and the second nut 59 to the protrusion 20 respectively, and tighten the bolt 58 on the telescopic gland 15 to keep the telescopic sealing ring 14 sealed.

As shown in Figure 16, on the basis of Figure 14, loosen the bolt 58 on the telescopic gland 15 to make the telescopic sealing ring 14 in a relaxed state, loosen the second nut 59 on the telescopic screw rod 17, and make the second nut 59 Rotate toward the cotter pin 57 until the cotter pin 57 stops. Stretch the telescopic tube 16 to the outside of the valve body 7 until the second nut 59 presses on the protrusion 20 . At this time, the maximum structural length of the limiting telescopic butterfly valve is L+ΔL, and the dimension between the telescopic tube 16 and the valve body 7 is -2ΔL. Tighten the first nut 56 to the protrusion 20. When the first nut 56 is tightened, the second nut 59 is also tightly pressed on the protrusion 20, and the bolt 58 on the telescopic gland 15 is tightened to make the telescopic sealing ring 14 Keep sealed.

The stretching and pushing of the telescopic tube to the valve body are limited to prevent overstretching and pushing.

Stretching the telescopic tube to the outside of the valve can increase the structural length of the telescopic butterfly valve, and pushing the telescopic tube to the valve body can reduce the structural length of the telescopic butterfly valve, so that the structural length of the telescopic butterfly valve is equal to the reserved length between the two flanges on the construction site Match to ensure the installation of telescopic butterfly valve.

The driving device 1 drives the upper valve shaft to rotate clockwise through the flat key 2, and the upper valve shaft drives the valve plate 11 to rotate clockwise through the pin shaft 10, and the valve is closed; the driving device drives the upper valve shaft to rotate counterclockwise through the flat key, and the upper valve shaft The valve plate is driven to rotate counterclockwise by the pin shaft, and the valve is opened.

Claims (9)

1. flexible butterfly valve, it includes valve body, valve shaft, valve plate, valve plate sealing ring, valve body sealing surface and extensible member, it is characterized in that: institute It states valve plate sealing ring and is fixed on valve plate by adjusting pressing plate, the adjusting pressing plate is fixed on butterfly plate by several bridge screws On, the bridge screw is distributed around valve plate horizontal interval, and circular cone dual-lug type is equipped between adjusting pressing plate and the bridge screw Stop washer, the circular cone dual-lug type stop washer includes conic tube compatible with the nut outer diameter of bridge screw, described The big face of conic tube has screech owl and cropped ear, and the screech owl is fitted on the nut of bridge screw, and the cropped ear is fitted in tune Save the outer of pressing plate.

2. flexible butterfly valve as described in claim 1, it is characterized in that: the linear distance between two neighboring bridge screw is 6-8 Bridge screw nominal diameter again.

3. stretch butterfly valve as described in claim 1, it is characterized in that: being opened up on the adjusting pressing plate between two neighboring bridge screw There is internal thread hole, the internal thread hole screw-internal thread fit has the holding screw contacted with butterfly plate.

4. flexible butterfly valve as described in claim 1, it is characterized in that: the extensible member includes telescoping tube, flexible gland, flexible spiral shell Bar and valve body connecting flange, the tube body that the telescoping tube includes standard flange and is fixed on standard flange with one heart, the standard The expansion screw through-hole and flange hole that a circle is interspersed, the circumference of the valve body connecting flange are evenly equipped on the periphery of flange The outwardly extending protrusion of a circle is distributed in the outer rim of face, expansion screw through-hole is offered in the protrusion, the protrusion is located at phase Between adjacent two flange holes, there is valve body connecting flange sealing surface, the valve on the periphery inner edge of the valve body connecting flange The flexible gland fastener hole of a circle is also distributed on the periphery middle section of body connecting flange, the expansion screw includes and stretches The first threaded portion, cylindrical portion and the expansion screw through hole whorl with valve body connecting flange of the expansion screw through hole whorl cooperation of pipe Second threaded portion of cooperation, the flexible gland are threadedly coupled by bolt with the flexible gland fastener hole of valve body connecting flange.

5. flexible butterfly valve as claimed in claim 4, it is characterized in that: the end of two threaded portion is equipped with split pin.

6. flexible butterfly valve as claimed in claim 4, it is characterized in that: between the flexible gland, tube body and valve body connecting flange Equipped with flexible seal ring, on the flexible seal ring and tube body contact surface and flexible seal ring and valve body connecting flange contact surface It is respectively equipped with protrusion, so that being interference fitted between flexible seal ring and tube body and valve body connecting flange.

7. flexible butterfly valve as claimed in claim 6, it is characterized in that: the section of the flexible seal ring is right-angled trapezium, tiltedly Face and upper bottom surface are contacted with flexible gland, and bottom surface is contacted with tube body, and right-angle surface is contacted with valve body connecting flange, described oblique The contact point of face and flexible gland is located at the bottom of the slope, using the contact point as vertex to the upper bottom surface direction inclined-plane of right-angled trapezium and 2 ° -5 ° of angle is formed between flexible gland.

8. flexible butterfly valve as described in claim 1, it is characterized in that: the valve shaft includes upper valve shaft and lower valve shaft, the upper valve Axis is equipped with the upper shaft shoulder, and the upper shaft shoulder is equipped with sealing shroud and sealing gland, and the sealing shroud and the upper shaft shoulder are in vertical direction Clearance fit, the lower valve shaft are equipped with the lower shaft shoulder, and the bottom of the lower shaft shoulder is contacted with the end cap for being fixed on body base, institute The lower shaft shoulder and valve body is stated to cooperate in vertical gap.

9. flexible butterfly valve as claimed in claim 8, it is characterized in that: the upper valve shaft and lower valve shaft pass through pin shaft and valve plate respectively Connection.