CN212928811U - 140MPA hydraulic flat gate valve - Google Patents
140MPA hydraulic flat gate valve Download PDFInfo
- Publication number
- CN212928811U CN212928811U CN202021335026.9U CN202021335026U CN212928811U CN 212928811 U CN212928811 U CN 212928811U CN 202021335026 U CN202021335026 U CN 202021335026U CN 212928811 U CN212928811 U CN 212928811U
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- 238000007789 sealing Methods 0.000 claims abstract description 388
- 210000004907 gland Anatomy 0.000 claims abstract description 10
- 238000012856 packing Methods 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The utility model discloses a 140MPA plate valve that surges, the utility model provides a current plate valve packing seal friction-intolerance, sealed insecure problem. After the gland compresses the sealing assembly, the valve rod and the valve cover are tightly propped through the deformation of the upper sealing element, the main sealing element and the lower sealing element, and multiple sealing is formed in the axial direction; the first sealing ring and the second sealing ring are tightly pressed through deformation of the sealing ring A, the first sealing ring and the second sealing ring are tightly pressed through deformation of the sealing ring B, the sealing ring C, the sealing ring D and the sealing ring E, the first sealing ring and the second sealing ring are tightly pressed through deformation of the sealing ring K and the sealing ring L, and multiple sealing is formed in the radial direction; the second sealing ring is tightly supported through deformation of the sealing ring F, the stress of the sealing ring F and the inclined plane of the third sealing groove is increased, the sealing ring H and the sealing ring J are tightly supported through deformation of the sealing ring F, the stress of the sealing ring H and the inclined plane of the sealing ring J and the inclined plane of the fourth sealing groove is increased, and therefore the second sealing ring is tightly supported through deformation of the valve rod and the valve cover, and the sealing effect is greatly improved.
Description
Technical Field
The utility model particularly relates to a 140MPA plate valve that surges.
Background
A flat gate valve is a sliding valve whose closing member is a parallel gate plate. The closing member can be a single gate or a double gate with an opening mechanism. The pressing force of the gate plate to the valve seat is controlled by the medium pressure of the floating gate plate or the floating valve seat. In the case of a double-gate plate gate valve, the pressing force can be supplemented by a spreading mechanism between the two gate plates.
The action principle of the hydraulic plate gate valve is that in an electromechanical and hydraulic linkage system, under the action of a reversing valve, when a piston is driven to move downwards by the working pressure of hydraulic oil, a gate plate with a flow guide hole moves up and down in the middle of 2 floating valve seats with springs. When the plane part of the valve plate moves to the middle of the valve seat, the valve seat tightly presses the flashboard under the action of the pressure of the pipeline medium and the spring force in the valve seat, and the valve is in a full-closed state, so that the sealing of the valve is realized. Otherwise, the valve is in a full-open state when the flashboard moves upwards. However, the existing hydraulic flat gate valve has the following problems that the valve rod is usually sealed through the packing, the leakage of substances conveyed on a pipeline along the valve rod is guaranteed, the existing packing seal is not friction-resistant, the opening and closing times are more, the leakage is easy to occur after a long time, and the reliability of the valve seal is influenced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to the weak point of prior art, the utility model provides a 140MPA flat gate valve that surges.
The utility model provides a technical scheme of above-mentioned problem does: a140 MPA hydraulic flat gate valve comprises a valve body, a valve cover arranged on the top of the valve body, a valve rod, a sealing assembly, a gland, an oil cylinder, a gate plate, a movable valve seat and a fixed valve seat, wherein the lower end of the valve rod sequentially extends into the valve cover and the valve body to form a packing cavity with the valve cover;
the sealing assembly comprises a lower sealing element, the bottom of which is abutted with the valve cover, a main sealing element, the bottom of which is abutted with the first sealing element, and an upper sealing element, the bottom of which is abutted with the second sealing element and is vertically symmetrical relative to the second sealing element and the lower sealing element;
the lower sealing element comprises a first sealing ring, wherein an inner cylindrical surface is abutted with the valve rod, an outer cylindrical surface is abutted with the valve cover, the top of the first sealing ring is provided with a first sealing groove, an inner cylindrical surface is abutted with the valve rod, an outer cylindrical surface is abutted with the valve cover, and the second sealing ring is positioned above the first sealing ring;
the first sealing groove comprises a sealing groove A with an isosceles trapezoid cross section and a circular horizontal projection, and a sealing groove B which is positioned at the bottom of the sealing groove A, has a rectangular cross section and a circular horizontal projection;
the second sealing groove comprises a sealing groove C with an isosceles trapezoid cross section and a circular horizontal projection, and a sealing groove D which is positioned at the top of the sealing groove C, has a rectangular cross section and a circular horizontal projection; a sealing area is formed between the sealing groove C and the sealing groove A;
the section of the third sealing groove is in an isosceles trapezoid shape, and the projection of the horizontal plane is in a circular ring shape; the distance from the fourth sealing groove to the valve rod is smaller than that from the third sealing groove to the valve rod, the section of the fourth sealing groove is in an isosceles trapezoid shape, and the projection of the horizontal plane is in a circular ring shape;
the third sealing ring comprises a sealing ring A with a circular section and positioned in a sealing area, a sealing ring B which is arranged on the sealing ring A and the bottom of which is abutted against the sealing groove B, a sealing ring C which is arranged on the sealing ring A and the top of which is abutted against the sealing groove D, a pair of sealing rings D which are arranged on the sealing ring A and positioned at two sides of the sealing ring B and the bottom of which is abutted against the sealing groove A, and a pair of sealing rings E which are arranged on the sealing ring A and positioned at two sides of the sealing ring C and;
the main sealing element comprises a fourth sealing ring, a fifth sealing ring which is arranged at the bottom of the fourth sealing ring and is abutted against the lower sealing element, and a sixth sealing ring which is arranged at the top of the fourth sealing ring and is abutted against the upper sealing element, wherein the fifth sealing ring and the sixth sealing ring are vertically symmetrical about the fourth sealing ring;
the fifth sealing ring is a cutting circle including being installed in fourth sealing ring bottom and cross-section, be located the sealing ring F of third seal groove, install the sealing ring G at fourth sealing ring bottom and bottom butt fourth seal groove perpendicularly, install in sealing ring G one side and along a plurality of sealing ring H that sealing ring G direction of height distributes, install in sealing ring G one side and about a plurality of sealing ring J of sealing ring G with sealing ring H symmetry, sealing ring H butt fourth seal groove inclined plane and perpendicular with fourth seal groove inclined plane, sealing ring H's length reduces from the top down gradually along sealing ring G direction of height.
Further, sealing ring D and sealing ring E are symmetrical about sealing ring A from top to bottom, and sealing ring D includes the first gasket that installs perpendicularly on sealing ring A and horizontal plane projection is the ring form, installs on the first gasket and with the parallel second gasket of horizontal plane.
Further, the sealing ring F subtends an angle greater than 180 °.
Further, sealing ring K and sealing ring M that sealing ring G symmetry is equipped with about sealing ring G bottom, sealing ring K cross-section be right triangle and bottom and fourth seal groove butt.
Furthermore, a plurality of fifth sealing grooves with isosceles trapezoid cross sections and circular horizontal plane projection are arranged at the bottom of the second sealing ring along the radial direction;
and a plurality of sealing rings L with isosceles trapezoid cross sections and matched with the fifth sealing groove are arranged at the top of the first sealing ring along the radial direction, and the sealing rings L are inserted into the fifth sealing groove.
The utility model discloses beneficial effect has: the utility model discloses an go up sealing member, lower sealing member, main seal spare and form multiple seal structure, solved current plate valve packing and sealed not resistant friction, sealed reliable poor problem. After the gland compresses the sealing assembly, the valve rod and the valve cover are tightly propped through the deformation of the upper sealing element, the main sealing element and the lower sealing element, and multiple sealing is formed in the axial direction; the first sealing ring and the second sealing ring are tightly pressed through deformation of the sealing ring A, the first sealing ring and the second sealing ring are tightly pressed through deformation of the sealing ring B, the sealing ring C, the sealing ring D and the sealing ring E, the first sealing ring and the second sealing ring are tightly pressed through deformation of the sealing ring K and the sealing ring L, and multiple sealing is formed in the radial direction; the second sealing ring is tightly supported through deformation of the sealing ring F, the contact stress between the sealing ring F and the inclined surface of the third sealing groove is increased, the sealing ring H and the sealing ring J are tightly supported through deformation of the sealing ring F, the contact stress between the sealing ring H and the inclined surface of the fourth sealing groove is increased, and therefore the second sealing ring is deformed to tightly support the valve rod and the valve cover, and the sealing effect is greatly improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the sealing assembly of the present invention;
FIG. 3 is a schematic view of the structure of the lower sealing member of the present invention;
fig. 4 is a schematic structural view of a first seal ring of the present invention;
fig. 5 is a schematic structural view of a second seal ring of the present invention;
fig. 6 is a schematic structural view of a third seal ring of the present invention;
fig. 7 is a schematic structural view of the main sealing member of the present invention.
In the figure:
1-a valve body, 2-a valve cover, 3-a valve rod, 4-a sealing component, 5-a gland, 6-a cylinder, 7-a flashboard, 10-a lower sealing element, 11-a main sealing element, 12-an upper sealing element, 13-a first sealing ring, 14-a second sealing ring, 15-a first sealing groove, 16-a second sealing groove, 17-a third sealing groove, 18-a fourth sealing groove, 19-a third sealing groove, 20-a sealing groove A, 21-a sealing groove B, 22-a sealing groove C, 23-a sealing groove D, 24-a fifth sealing groove, 25-a sealing ring L, 26-a sealing ring A, 27-a sealing ring B, 28-a sealing ring C, 29-a sealing ring D, 30-a sealing ring E and 31-a first sealing sheet, 32-second sealing piece, 33-fourth sealing ring, 34-fifth sealing ring, 35-sealing ring F, 36-sealing ring G, 37-sealing ring H, 38-sealing ring J, 39-sealing ring K and 40-sealing ring M.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description.
A140 MPA hydraulic flat gate valve comprises a valve body 1, a valve cover 2 installed on the top of the valve body 1, a valve rod 3, a sealing component 4, a gland 5, an oil cylinder 6, a flashboard 7, a movable valve seat and a fixed valve seat, wherein the lower end of the valve rod 3 sequentially extends into the valve cover 2 and the valve body 1 to form a packing cavity with the valve cover 2, the sealing component 4 is positioned in the packing cavity, the bottom of the sealing component 4 is tightly pressed and the gland 5 is installed on the valve cover 2, the oil cylinder 6 is installed on the top of the gland 5, a telescopic rod of the oil cylinder is installed on the valve rod 3, the flashboard;
the sealing assembly 4 comprises a lower sealing element 10, the bottom of which is abutted with the valve cover 2, a main sealing element 11, the bottom of which is abutted with a first sealing element, and an upper sealing element 12, the bottom of which is abutted with a second sealing element and is vertically symmetrical to the lower sealing element 10 relative to the second sealing element;
a multi-sealing structure is formed by the upper sealing element 12, the lower sealing element 10 and the main sealing element 11, and the problems that the packing seal of the existing flat gate valve is not friction-resistant and the seal is poor in reliability are solved.
The lower sealing element 10 comprises a first sealing ring 13, wherein the inner cylindrical surface of the first sealing ring is abutted with the valve rod 3, the outer cylindrical surface of the first sealing ring is abutted with the valve cover 2, the top of the first sealing ring is provided with a first sealing groove 15, the inner cylindrical surface of the second sealing ring is abutted with the valve rod 3, the outer cylindrical surface of the second sealing ring is abutted with the valve cover 2, the second sealing ring 14 is positioned above the first sealing ring 13, the bottom of the second sealing ring 14 is provided with a second sealing groove 16, the top of the second sealing ring 14 is provided with a third sealing groove 17 and a fourth sealing groove 18, and a third sealing ring 19 is positioned in the first;
the first sealing groove 15 comprises a sealing groove A20 with an isosceles trapezoid cross section and a circular horizontal projection, and a sealing groove B21 with a rectangular cross section and a circular horizontal projection, which is located at the bottom of the sealing groove A20;
the second sealing groove 16 comprises a sealing groove C22 with an isosceles trapezoid cross section and a circular horizontal projection, and a sealing groove D23 with a rectangular cross section and a circular horizontal projection, which is located at the top of the sealing groove C22; a sealing area is formed between the sealing groove C22 and the sealing groove A20;
the section of the third sealing groove 17 is isosceles trapezoid and the projection of the horizontal plane is circular; the distance from the fourth sealing groove 18 to the valve rod 3 is smaller than the distance from the third sealing groove 17 to the valve rod 3, the section of the fourth sealing groove 18 is in an isosceles trapezoid shape, and the projection of the horizontal plane is in a circular ring shape;
a plurality of fifth sealing grooves 24 with isosceles trapezoid cross sections and circular horizontal plane projection are arranged at the bottom of the second sealing ring 14 along the radial direction; a plurality of sealing rings L25 having isosceles trapezoid cross sections and matching with the fifth sealing groove 24 are installed at the top of the first sealing ring 13 along the radial direction, and the sealing ring L25 is inserted into the fifth sealing groove 24.
The third seal ring 19 includes a seal ring a26 having a circular cross section and located in a seal area, a seal ring B27 mounted on the seal ring a26 and having a bottom abutting against the seal groove B21, a seal ring C28 mounted on the seal ring a26 and having a top abutting against the seal groove D23, a pair of seal rings D29 mounted on the seal ring a26 and located on both sides of the seal ring B27 and having a bottom abutting against the seal groove a20, and a pair of seal rings E30 mounted on the seal ring a26 and located on both sides of the seal ring C28 and having a top abutting against the seal groove C22;
seal ring D29 and seal ring E30 are vertically symmetrical with respect to seal ring a26, and seal ring D29 includes first seal piece 31 vertically mounted on seal ring a26 and having a circular ring-shaped horizontal plane projection, and second seal piece 32 mounted on first seal piece 31 and parallel to the horizontal plane.
The main sealing element 11 comprises a fourth sealing ring 33, a fifth sealing ring 34 which is arranged at the bottom of the fourth sealing ring 33 and is abutted against the lower sealing element 10, and a sixth sealing ring which is arranged at the top of the fourth sealing ring 33 and is abutted against the upper sealing element 12, wherein the fifth sealing ring 34 and the sixth sealing ring are vertically symmetrical relative to the fourth sealing ring 33;
The sealing ring F35 subtends an angle of greater than 180 °. The seal ring K39 and the seal ring M40 are provided at the bottom of the seal ring G36 so as to be symmetrical with respect to the seal ring G36, and the seal ring K39 has a right triangle cross section and the bottom abuts against the fourth seal groove 18.
After the gland 5 compresses the sealing assembly 4, the upper sealing element 12, the main sealing element 11 and the lower sealing element 10 deform to tightly abut against the valve rod 3 and the valve cover 2, and multiple sealing is formed in the axial direction; the sealing ring A26 deforms to tightly abut against the first sealing ring 13 and the second sealing ring 14, the sealing ring B27, the sealing ring C28, the sealing ring D29 and the sealing ring E30 deform to tightly abut against the first sealing ring 13 and the second sealing ring 14, and the sealing ring K39 and the sealing ring M40 deform to tightly abut against the first sealing ring 13 and the second sealing ring 14, so that multiple sealing is formed in the radial direction; the second sealing ring 14 is tightly abutted by deformation of the sealing ring F35, the contact stress of the sealing ring F35 and the inclined plane of the third sealing groove 17 is increased, the sealing rings H37 and J38 are tightly abutted by deformation of the second sealing ring 14, and the contact stress of the sealing rings H37, J38 and the inclined plane of the fourth sealing groove 18 is increased, so that the second sealing ring 14 is tightly abutted by deformation of the valve rod 3 and the valve cover 2, and the sealing effect is greatly improved.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, and that the scope of the invention is defined by the appended claims.
Claims (8)
1. The 140MPA hydraulic flat gate valve is characterized by comprising a valve body (1), a valve cover (2) arranged at the top of the valve body (1), a valve rod (3) with the lower end sequentially extending into the valve cover (2) and the valve body (1) and forming a packing cavity with the valve cover (2), a sealing component (4) positioned in the packing cavity, a gland (5) with the bottom pressing the sealing component (4) and arranged on the valve cover (2), an oil cylinder (6) arranged at the top of the gland (5) and with an expansion rod arranged on the valve rod (3), a gate plate (7) arranged at the bottom of the valve rod (3) and positioned in the valve body (1), and a movable valve seat and a fixed valve seat which are respectively arranged at two sides of the gate plate (7) and mutually matched with the;
the sealing assembly (4) comprises a lower sealing element (10) with the bottom abutting against the valve cover (2), a main sealing element (11) with the bottom abutting against the first sealing element, and an upper sealing element (12) with the bottom abutting against the second sealing element and vertically symmetrical to the lower sealing element (10) relative to the second sealing element;
the lower sealing element (10) comprises a first sealing ring (13) with an inner cylindrical surface abutted against the valve rod (3) and an outer cylindrical surface abutted against the valve cover (2), and the top of the first sealing ring (13) is provided with a first sealing groove (15), the inner cylindrical surface abutted against the valve rod (3) and the outer cylindrical surface abutted against the valve cover (2), and a second sealing ring (14) positioned above the first sealing ring (13), wherein the bottom of the second sealing ring (14) is provided with a second sealing groove (16), the top of the second sealing ring (14) is provided with a third sealing groove (17) and a fourth sealing groove (18), and a third sealing ring (19) which is positioned in the first sealing groove (15) and the second sealing groove (16) and abutted against the first sealing ring (13) and the second;
the first sealing groove (15) comprises a sealing groove A (20) with an isosceles trapezoid cross section and a circular horizontal projection, and a sealing groove B (21) which is located at the bottom of the sealing groove A (20), is rectangular in cross section and circular horizontal projection;
the second sealing groove (16) comprises a sealing groove C (22) with an isosceles trapezoid cross section and a circular horizontal projection, and a sealing groove D (23) which is positioned at the top of the sealing groove C (22), is rectangular in cross section and circular horizontal projection; a sealing area is formed between the sealing groove C (22) and the sealing groove A (20);
the section of the third sealing groove (17) is isosceles trapezoid and the projection of the horizontal plane is circular; the distance between the fourth sealing groove (18) and the valve rod (3) is smaller than the distance between the third sealing groove (17) and the valve rod (3), the section of the fourth sealing groove (18) is isosceles trapezoid, and the horizontal plane projection is circular;
the third sealing ring (19) comprises a sealing ring A (26) with a circular section and positioned in a sealing area, a sealing ring B (27) which is arranged on the sealing ring A (26) and the bottom of which is abutted against the sealing groove B (21), a sealing ring C (28) which is arranged on the sealing ring A (26) and the top of which is abutted against the sealing groove D (23), a pair of sealing rings D (29) which are arranged on the sealing ring A (26) and positioned at two sides of the sealing ring B (27) and the bottom of which is abutted against the sealing groove A (20), and a pair of sealing rings E (30) which are arranged on the sealing ring A (26) and positioned at two sides of the sealing ring C (28) and the;
the main sealing element (11) comprises a fourth sealing ring (33), a fifth sealing ring (34) which is arranged at the bottom of the fourth sealing ring (33) and is abutted against the lower sealing element (10), and a sixth sealing ring which is arranged at the top of the fourth sealing ring (33) and is abutted against the upper sealing element (12), wherein the fifth sealing ring (34) and the sixth sealing ring are vertically symmetrical relative to the fourth sealing ring (33);
fifth sealing washer (34) is including installing at fourth sealing washer (33) bottom and cross-section for the secant circle, be located sealing ring F (35) of third seal groove (17), install sealing ring G (36) at fourth sealing washer (33) bottom and bottom butt fourth seal groove (18) perpendicularly, install a plurality of sealing ring H (37) that just distribute along sealing ring G (36) direction of height in sealing ring G (36) one side, install a plurality of sealing ring J (38) that just are symmetrical with sealing ring H (37) at sealing ring G (36) one side, sealing ring H (37) butt fourth seal groove (18) inclined plane and with fourth seal groove (18) inclined plane perpendicular, the length of sealing ring H (37) reduces from the top down gradually along sealing ring G (36) direction of height.
2. A 140MPA hydraulic flat gate valve according to claim 1, wherein the seal rings D (29) and E (30) are vertically symmetrical with respect to the seal ring a (26), the seal ring D (29) comprises a first seal piece (31) vertically installed on the seal ring a (26) and having a circular ring shape in horizontal plane projection, and a second seal piece (32) installed on the first seal piece (31) and parallel to the horizontal plane.
3. A 140MPA hydraulic flat gate valve according to claim 1 or 2, wherein the sealing ring F (35) subtends an angle of greater than 180 °.
4. A 140MPA hydraulic plate gate valve according to claim 1 or 2, wherein the bottom of the sealing ring G (36) is provided with a sealing ring K (39) and a sealing ring M (40) which are symmetrical with respect to the sealing ring G (36), the cross section of the sealing ring K (39) is right triangle and the bottom abuts against the fourth sealing groove (18).
5. A 140MPA hydraulic plate gate valve according to claim 3, wherein the bottom of the seal ring G (36) is provided with a seal ring K (39) and a seal ring M (40) which are symmetrical with respect to the seal ring G (36), the cross section of the seal ring K (39) is right triangle and the bottom abuts against the fourth seal groove (18).
6. A 140MPA hydraulic flat gate valve according to claim 1, 2 or 5, wherein the bottom of the second sealing ring (14) is provided with a plurality of fifth sealing grooves (24) having isosceles trapezoid cross sections and circular horizontal plane projection along the radial direction;
a plurality of sealing rings L (25) which are isosceles trapezoid in cross section and matched with the fifth sealing groove (24) are installed at the top of the first sealing ring (13) along the radial direction, and the sealing rings L (25) are inserted into the fifth sealing groove (24).
7. A 140MPA hydraulic flat gate valve according to claim 3, wherein the bottom of the second seal ring (14) is provided with a plurality of fifth seal grooves (24) having isosceles trapezoid cross sections and circular horizontal plane projection in the radial direction;
a plurality of sealing rings L (25) which are isosceles trapezoid in cross section and matched with the fifth sealing groove (24) are installed at the top of the first sealing ring (13) along the radial direction, and the sealing rings L (25) are inserted into the fifth sealing groove (24).
8. The 140MPA hydraulic flat gate valve according to claim 4, wherein the bottom of the second seal ring (14) is provided with a plurality of fifth seal grooves (24) having isosceles trapezoid cross sections and circular horizontal plane projection in the radial direction;
a plurality of sealing rings L (25) which are isosceles trapezoid in cross section and matched with the fifth sealing groove (24) are installed at the top of the first sealing ring (13) along the radial direction, and the sealing rings L (25) are inserted into the fifth sealing groove (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021335026.9U CN212928811U (en) | 2020-07-09 | 2020-07-09 | 140MPA hydraulic flat gate valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021335026.9U CN212928811U (en) | 2020-07-09 | 2020-07-09 | 140MPA hydraulic flat gate valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212928811U true CN212928811U (en) | 2021-04-09 |
Family
ID=75328958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021335026.9U Expired - Fee Related CN212928811U (en) | 2020-07-09 | 2020-07-09 | 140MPA hydraulic flat gate valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212928811U (en) |
-
2020
- 2020-07-09 CN CN202021335026.9U patent/CN212928811U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210409 |