CN203670925U - Large-caliber slant type check valve - Google Patents
Large-caliber slant type check valve Download PDFInfo
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- CN203670925U CN203670925U CN201320824163.2U CN201320824163U CN203670925U CN 203670925 U CN203670925 U CN 203670925U CN 201320824163 U CN201320824163 U CN 201320824163U CN 203670925 U CN203670925 U CN 203670925U
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Abstract
The utility model relates to the field of valves, in particular to a large-caliber slant type check valve. The large-caliber slant type check valve comprises a valve body, a valve seat, a valve clack and hinge pins, the valve clack is in linkage connection with the hinge pins, a hydraulic buffering device is arranged outside the valve body and comprises a starting piece, a shell and a hydraulic cavity formed in the shell, a fluid pushing mechanism, hydraulic fluid and fluid passages are arranged in the hydraulic cavity, the hydraulic cavity is divided by the fluid pushing mechanism into two or more cavities, the cavities are communicated through the fluid passages, the fluid pushing mechanism prompts the hydraulic fluid in the cavities to pass through the fluid passages and carry out flow replacement in the cavities, and the fluid pushing mechanism is linked with the hinge pins. Due to the incompressibility of the hydraulic fluid, different flow changes of the hydraulic fluid are generated when the hydraulic fluid passes through the different fluid passages in the fluid pushing process, and therefore the two stages of rapid rotation and slow rotation of the fluid pushing mechanism are achieved.
Description
Technical field
The utility model relates to a kind of valve, the heavy caliber tilting safety check with hydraulic damping device that particularly a kind of petrochemical industry is used.
Background technique
Traditional petrochemical industry operating mode uses heavy caliber safety check normally by valve body, valve seat, flap, the Swing check valve that the Assembly of the parts such as bearing pin form, be arranged on and on the transmission pipeline of petrochemical equipment, automatically prevent the purposes that in pipeline, working medium flows backwards, its switch relies on working medium promotion flap to rotate along bearing pin, in the time that medium forward passes through, rely on the forward impact power of medium can make flap rotate and open to make MEDIA FLOW mistake, in the time of medium counter flow, because can making flap, the self gravitation of flap comes back to normal position, thereby realize closing of safety check, this Swing check valve in use common problem is: heavy caliber safety check flows backwards and pressure very easily occurs while cutting out is sharply increased to and exceedes several times of the normal pressure even dangerous water hammers of tens times, can be to pipeline, pump valve causes the serious consequence of destruction.1. heavy caliber safety check flows backwards and pressure very easily occurs while cutting out is sharply increased to and exceedes several times of the normal pressure even dangerous water hammers of tens times, causes the serious consequence of destruction can to pipeline, pump valve; 2. because the sealing pair of this valve is plane sealing, and sealing force is only from valve working medium automatic back flow pressure, and cannot reach must seal pressure, and poor sealing performance, very easily leaks; 3. stuffing box structure is simple, and conventional fillers is is very easily worn and torn and caused leakage.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of heavy caliber tilting safety check of new structure, this safety check have while closing flap and sealing surface of seat without shock, good seal performance, switch is rapid, flow resistance is little, pressure drop is low and the good service behaviour of stuffing box zero leakage and non-water-attack phenomenon.
For solving the problems of the technologies described above, the utility model provides a kind of heavy caliber tilting safety check, comprise valve body, valve seat, flap and bearing pin, flap and bearing pin are connected, described valve body outside is provided with hydraulic damping device, this hydraulic damping device comprises activation members, housing and be located at the liquid oxygen chamber in housing, in hydraulic pressure cavity, be provided with Tui Ye mechanism, hydraulic fluid and fluid passage, Tui Ye mechanism is divided into two with upper plenum hydraulic pressure cavity, fluid passage is communicated with each cavity, Tui Ye mechanism impels the replacement of flowing through fluid passage and in each cavity of the hydraulic fluid in each cavity, Gai Tui liquid mechanism and bearing pin interlock.
Adopt after such structure, because valve body outside is provided with hydraulic damping device, this hydraulic damping device is provided with Tui Ye mechanism and hydraulic fluid and in hydraulic damping device, is provided with multiple fluid passages, Tui Ye mechanism can be the replacement of flowing of the hydraulic fluid in cavity, the variation capable of regulating hydraulic fluid that passes through runner by hydraulic fluid in hydraulic pressure cavity flow, due to the liquid of hydraulic fluid employing incompressibility, can produce a reverse resistance to Tui Ye mechanism, turn soon and two stages of slow-speed thereby realize Liao Tui liquid mechanism.
As further improvement of the utility model, Gai Tui liquid mechanism comprises by stator and rotor and forming, stator is fixedly installed and is close to cavity inner wall in inner walls two ends correspondence, this hydraulic damping device is provided with coupling shaft, coupling shaft is connected with bearing pin, rotor middle part hollows out and is provided with axis hole, axis hole internal surface is provided with key, axis hole and coupling shaft are connect close-fitting by key, this fluid passage is divided into major diameter fluid passage and small-diameter fluid passage, stator is provided with minor diameter runner, housing is provided with major diameter fluid passage, the radian that major diameter fluid passage and cavity center form is greater than small-diameter fluid passage, small-diameter fluid passage is sandwiched between the port of two of major diameter fluid passages.
Adopt after such structure, the Tui Ye mechanism being formed by rotor and stator, simple in structure implementing conveniently, in rotor, be provided with axis hole and with coupling shaft close-fitting, coupling shaft is connected with bearing pin, like this can Shi Tui liquid mechanism and bearing pin interlock, reach the function of the opening and closing of controlling flap by this hydraulic damping device, and can make hydraulic fluid when the runner by different-diameter by runner that size diameter differs is set, produce the variation of flow, the position of runner arranges relation and also makes pushing away in liquid process, in the time being about to hydraulic fluid to push another cavity completely, rotor is just in time blocked major diameter fluid passage, thereby time hydraulic fluid can only from small-diameter fluid passage, pass through, reach the variation of flow.
As further improvement of the utility model, the blade of described rotor and stator are sector structure and blade can fit tightly with stator, on each stator, be all provided with a controlling mechanism and check valve assembly, this controlling mechanism is made up of throttling pin and locknut, throttling cushion is in a minor diameter runner, and check valve assembly is by steel ball, and spring and spring seat form, check valve assembly is located in another minor diameter runner, and this minor diameter runner passage both sides diameter is not etc.
Adopt after such structure, the blade of rotor and stator profile match and can fit tightly, guarantee pushing away in liquid process, can thoroughly hydraulic fluid be transferred to another chamber in a chamber, thereby the aisle spare of the adjustable small-diameter fluid passage of throttling pin regulates the flap speed while closing, one-way valve be arranged on left and right sides diameter not wait small-diameter fluid passage on, in the time of valve opening process, the moving direction of rotor can promote hydraulic fluid and act on steel ball, steel ball overcomes spring force and frictional force is opened one-way valve valve port, and in the time of valve closing process, the moving direction of rotor is contrary, make closed check valve.
As further improvement of the utility model, described valve seat is the elastic seat with elastic groove, sealing surface of seat is inclined-plane taper shape, this valve clack sealing surface is circular arc, arc-shaped seal surface in the time of valve closing and elastic seat combine closely, form linear sealing pair one, this bearing pin is located at valve body lumen both sides, in bearing pin center and valve body, be formed centrally two eccentric circles, flap circular seal face is progressively contacted in closing process with valve seat conical seal surface.
Adopt after such structure, because valve clack sealing surface has adopted circular arc, sealing surface of seat is inclined-plane cone type, in the time of sealing, can fit tightly, form linear sealing pair, sealing performance is much higher than general face sealing, in bearing pin center and valve body, be formed centrally two eccentric structures, make progressively contact in closing process, the setting of elastic seat in addition, has realized while closing little without shock and movement parts wearing and tearing.
As further improvement of the utility model, one end of bearing pin is stretched out valve body and is provided with combination seal filler device, this combination seal filler device comprises lip seal circle, tapered collar filler, emergent loop device, O RunddichtringO, autoloading structure, autoloading structure is by automatically loading gland, automatically load pressing plate, automatically loading bolt, automatically load butterfly spring and adjusting nut composition, lip seal snare is on bearing pin, the sealing of composition first, this tapered collar filler is located at respectively the upper of bearing pin, lower two ends also form second sealing with bearing pin, O RunddichtringO is arranged on automatic loading gland inwall, form three seals with bearing pin, emergent loop device is arranged on, between lower two groups of tapered collar fillers, communicate with through hole on valve body.
Adopt after such structure, lip seal circle has good Static and dynamic sealability, with the sealing of bearing pin composition first, simultaneously in the time compressing tapered collar filler, because of the effect of taper component, tapered collar filler is pushed on to the stuffing box inwall on bearing pin and valve body, form good sealing, therefore tapered collar filler and the sealing of bearing pin composition second, in addition, autoloading structure can automatically be discharged and put on tapered collar filler by the elastic force of compacted automatic loading butterfly spring, can make up the tapered collar filler and the lip seal circle surface friction damage that cause because of the long-term rotary switch work of bearing pin and keep its sealing, O-ring seals is arranged on automatic loading gland inwall, form three seals with bearing pin, work the seal action that stops tiny leakage.Emergent loop device is arranged between upper and lower two groups of tapered collar fillers, communicates with through hole on valve body, under operating mode, can connect remote monitoring, leaks out now once find that there is, and can adopt to inject seal gease or be filled with inert gas to play emergency sealing effect.
As further improvement of the utility model, automatically load butterfly spring and be located on automatic loading bolt, spring one side is resisted against automatic loading pressing plate one side and is resisted against adjusting nut, automatically loads gland level and is resisted against automatic loading pressing plate one side.
Adopt after such structure, when tapered collar filler, because wear and tear while producing deformation, spring discharges elastic force automatically, by autoloading structure, has guaranteed the sealability of tapered collar filler to bearing pin.
accompanying drawing explanation
Fig. 1 is hydraulic pressure-weight buffer valve opening state structural drawing
Fig. 2 is eccentric diclinic conical surface sealing structure figure of the present utility model
Fig. 3 is the structure enlarged view of valve seat in Fig. 1, flap linear sealing I
Fig. 4 is the structure enlarged view of packing seal II in Fig. 1
Fig. 5 hydraulic damping device structural drawing of the present utility model
Fig. 5 a is the A-A sectional structure chart of Fig. 5
Fig. 5 b is the B-B sectional structure chart of Fig. 5
Fig. 6 is flap work structuring schematic diagram
In figure: 1. valve body 2. elastic seat 3. flap 4. valve body positioning boss 5. end caps
6. end cap pad 7. bearing pin I 8. are sold 9. bearing pin II 10. support 11. coupling shaft 12. key I 13. key II 14. hydraulic damping device 15. key III 16. weight 17. flaps and valve seat linear sealing structure 18. lip seal circles 19, tapered collar filler 20, emergent loop device 21, O-ring seals I 22, automatically load gland 23, automatically load pressing plate 24, automatically load butterfly spring 25, automatically loading bolt 26, adjusting nut 27. lower cover 28. attachment screw 29. positioning screwn 30. upper cover 31. plug screw 32. plug screw pad 33. 0 shape seal ring II 34. housing 35. stator I 36. throttling pin I 37. locknut I 38. steel ball II 39. spring II 40. spring seat II 41. stator II 42. rotor 43. steel ball I 44. spring I 45. spring seat I 46. throttling pin II 47. locknut II
Embodiment
As shown in Fig. 5, Fig. 5 a and Fig. 5 b, the structure of hydraulic damping device (14) comprises by housing (34), lower cover (27), upper cover (30) and attachment screw (28) and forms oil hydraulic cylinder, in oil hydraulic cylinder, be provided with hydraulic pressure cavity, this activation members adopts weight (16) device, housing (34) upper and lower is provided with respectively a1-a2 and b1-b2 larger diameter fluid passage, is communicated with cavity A and cavity B.It is upper that stator I (35) and stator II (41) are fixed on housing (34) by positioning screwn (29), is provided with respectively the small-diameter fluid passage that c1-c2, d1-d2 and c3-c4, d3-d4 are communicated with cavity A and cavity B in stator I (35) and stator II (41).On c1-c2 passage in stator I (35), be provided with the controlling mechanism being formed by throttling pin I (36) and locknut I (37), on d1-d2 passage, be provided with the check valve assembly being formed by steel ball I (43), spring I (44) and spring seat I (45); On c3-c4 passage in stator II (41), be provided with the controlling mechanism being formed by throttling pin II (46) and locknut II (47) simultaneously, on d3-d4 passage, be provided with the check valve assembly being formed by steel ball II (38), spring II (39) and spring seat II (40).Between rotor (42) cylindrical and housing (34) inner circle, coordinate for highi degree of accuracy is moving, rotor (42) center hole and coupling shaft (11) are connect drive fit by key II (13), open or while closing, coupling shaft (11) can drive rotor (42) counterclockwise or turn clockwise housing (34) in.Plug screw (31) hole is for using to housing (34) cavity A and cavity B fluid injection hydraulic fluid, this hydraulic fluid can adopt the liquid with incompressibility, the preferred hydraulic oil of this specific embodiment, tightens salable firmly spiro pluging hole by plug screw (31) and plug screw pad (32) after hydraulic oil fills again.0 shape seal ring II (33), for sealing the connection part of all component, guarantees in hydraulic damping device (14) that hydraulic oil is not to external leakage.
As Fig. 1, Fig. 5 a, shown in Fig. 5 b and Fig. 6, the working principle of hydraulic damping device (14) is: while occurring under fully open position at valve that as shown in Figure 1 working medium flows backwards, flap (3) can be along rotating towards closing direction clockwise under working medium and self gravitation effect, adds that moment that weight (16) now produces can pass through key III (15), coupling shaft (11), key I (12) and bearing pin I (7) and move and rotate towards closing direction with quick closing valve with bearing pin II (9) drive flap (3).Under this double shut moment loading, coupling shaft (11) clockwise rotates by key II (13) rotor driven (42), now in cavity A, the fluid pressure of hydraulic oil can act on the check valve assembly being made up of steel ball I (43), spring I (44) and spring seat I (45), it is closed, and simultaneously in cavity A, hydraulic oil can be in time goes from a1-a2 and c1-c2 fluid passage flow to the cavity of a2 and c2 direction cavity B; And the fluid pressure of hydraulic oil can act on the check valve assembly being made up of steel ball II (38), spring II (39) and spring seat II (40) in cavity B, it is closed, simultaneously in cavity B, hydraulic oil can be in time goes from b1-b2 and c3-c4 fluid passage flow to the cavity of b2 and c4 direction cavity A, guarantees that quick closing valve has moved.In the time that the M face of rotor (42) forwards the space imagination plane N face by a1 hole and b1 hole external diameter line to, a1-a2 and b1-b2 fluid passage are stopped completely by rotor (42), hydraulic oil can only flow through from c1-c2 and c3-c4 small-diameter fluid passage, now flow minimizing makes rotor (42) slow down its rotational speed and enters slow pass section, the controlling mechanism that the controlling mechanism that the slow flow velocity speed that closes section can be made up of throttling pin I (36) and locknut I (37) and throttling pin II (46) and locknut II (47) form regulates, now throttling pin I (36) can regulate the circulation area of c1-c2 small-diameter fluid passage, throttling pin II (46) can regulate the circulation area of c3-c4 small-diameter fluid passage, the common adjust flux of throttling pin I (36) and throttling pin II (46).Thereby make rotor (42) to close slowly synchronous flap (3) the slowly closing valve gradually that drives of action, avoided the generation of water hammer.
As shown in Fig. 1 and Fig. 6, on valve body both sides, be provided with respectively bearing pin I (7) and bearing pin II (9), flap (3) coordinates with bearing pin I (7) and bearing pin II (9) and can be along bearing pin I (7) and bearing pin II (9) revolution.The left end of bearing pin I (7), guarantees sealing by end cap (5) and end cap pad (6) with valve body (1) forming closed static seal.As shown in Figure 4, the right-hand member of bearing pin II (9) stretches out valve body (1), by lip seal circle (18), tapered collar filler (19), emergent loop device (20), O-ring seals I (21), automatically load gland (22), automatically load pressing plate (23), automatically load combined moving that butterfly spring (24), automatically loading bolt (25) and adjusting nut (26) form and seal the sealing of assurance bearing pin II (9).In the time of normal working medium drag flow, flap (3) turning anticlockwise Open valve, until its cylindrical back side and the endoceliac positioning boss of valve body (1) (4) are in the time of contact condition, valve is in fully open position, now the bottom plane of flap (3) is parallel with the fluid passage of valve body (1), and valve flow resistance minimum, pressure drop are minimum.In the time that working medium flows backwards, flap (3) is along bearing pin (7) and (9) revolution clockwise automatically, circular seal face on flap (3) can progressively contact with the conical elastic structure sealing surface of double inclined plane (as shown in Figure 2) on elastic seat (2), and final composition has flap and the elastic seat linear sealing pair (17) (as shown in Figure 3) of high leak tightness together.Because flap (3) is reached the standard grade sealing pair (20) and bearing pin I (7) and bearing pin II (9) gyration center apart from short, therefore while closing, flywheel moment is little, impact force is little, in addition flap (3) is that progressively cut-in type is closed with elastic seat (2), and the elastic force effect of the upper elastic groove of elastic seat (2), thereby can realize while closing little without shock and movement parts wearing and tearing.Hydraulic damping device (14) is arranged on valve body (1) outside by support (10), coupling shaft (11) is connected with bearing pin II (9) by key I (12), be connected with hydraulic damping device (14) by key II (13), be connected with weight (16) by key III (15).In valve closing process, hydraulic damping device (14) by quick closing valve, close two-step slowly and automatically complete valve closing, first be that the moment that quick closing valve section is produced by weight (16) drives flap (3) to accelerate clockwise to turn round to stop working medium to flow backwards towards closing direction with quick closing valve action, prevent working pump reversing; Enter slow passs section approaching while closing completely subsequently, play hydraulic cushion by hydraulic damping device (14) and do in order to slow pass action drive flap (3) slowly closing valve gradually, thereby avoided generation water hammer.
As shown in Figure 4, combination seal filling-material structure, it seals and guarantees that stuffing box is without leaking outside step by step at many levels.Its structure characteristic is: by automatically load gland (22), automatically load pressing plate (23), automatically loading bolt (25), automatically load the autoloading structure that butterfly spring (24) and adjusting nut (26) form and can compress tapered collar filler (19) and lip seal circle (18) downwards.Because lip seal circle (18) has good Static and dynamic sealability, therefore with bearing pin II (9) composition first seal action.Simultaneously in the time compressing tapered collar filler (19), because of the effect of taper component, tapered collar filler (19) is pushed on to the stuffing box inwall on bearing pin II (9) and valve body (1), form good sealing, therefore tapered collar filler (19) and the sealing of bearing pin II (9) composition second.In addition, autoloading structure can automatically be discharged and be put on tapered collar filler (19) above by the elastic force of compacted automatic loading butterfly spring (24), can make up the tapered collar filler (19) and lip seal circle (18) the surface friction damage that cause because of the long-term rotary switch work of bearing pin II (9) and keep its sealing.O-ring seals I (21) is arranged on automatic loading gland (22) inwall, with bearing pin II (9) composition three seals, works the seal action that stops tiny leakage.Emergent loop device (20) is arranged between upper and lower two groups of tapered collar fillers (19), communicate with the upper through hole of valve body (1), under operating mode, can connect remote monitoring, leak out now once find that there is, can adopt to inject seal gease or be filled with inert gas and play emergency sealing effect.
Claims (7)
1. a heavy caliber tilting safety check, comprise valve body, valve seat, flap and bearing pin, flap and bearing pin are connected, it is characterized in that: described valve body outside is provided with hydraulic damping device, this hydraulic damping device comprises activation members, housing and be located at the liquid oxygen chamber in housing, in hydraulic pressure cavity, be provided with Tui Ye mechanism, hydraulic fluid and fluid passage, Tui Ye mechanism is divided into two with upper plenum hydraulic pressure cavity, fluid passage is communicated with each cavity, Tui Ye mechanism impels the replacement of flowing through fluid passage and in each cavity of the hydraulic fluid in each cavity, Gai Tui liquid mechanism and bearing pin interlock.
2. a kind of heavy caliber tilting safety check according to claim 1, it is characterized in that: Gai Tui liquid mechanism comprises by stator and rotor and forming, stator is fixedly installed and is close to cavity inner wall in inner walls two ends correspondence, this hydraulic damping device is provided with coupling shaft, coupling shaft is connected with bearing pin, rotor middle part hollows out and is provided with axis hole, axis hole internal surface is provided with key, axis hole and coupling shaft are connect close-fitting by key, this fluid passage is divided into major diameter fluid passage and small-diameter fluid passage, stator is provided with minor diameter runner, housing is provided with major diameter fluid passage, the radian that major diameter fluid passage and cavity center form is greater than small-diameter fluid passage, small-diameter fluid passage is sandwiched between the port of two of major diameter fluid passages.
3. a kind of heavy caliber tilting safety check according to claim 2, it is characterized in that: the blade of rotor and stator are sector structure and blade can fit tightly with stator, on each stator, be all provided with a controlling mechanism and check valve assembly, this controlling mechanism is made up of throttling pin and locknut, throttling cushion is in a minor diameter runner, check valve assembly is by steel ball, spring and spring seat composition, check valve assembly is located in another minor diameter runner, and this minor diameter runner passage both sides diameter is not etc.
4. a kind of heavy caliber tilting safety check according to claim 1, this valve seat is the elastic seat with elastic groove, and sealing surface of seat is inclined-plane taper shape, and this valve clack sealing surface is circular arc, arc-shaped seal surface in the time of valve closing and elastic seat combine closely, form linear sealing pair one.
5. heavy caliber tilting safety check according to claim 1, is characterized in that: this bearing pin is located at valve body lumen both sides, is formed centrally two eccentric circles in bearing pin center and valve body.
6. a kind of heavy caliber tilting safety check according to claim 1, it is characterized in that: one end of bearing pin is stretched out valve body and is provided with combination seal filler device, this combination seal filler device comprises lip seal circle, tapered collar filler, emergent loop device, O RunddichtringO, autoloading structure, autoloading structure is by automatically loading gland, automatically load pressing plate, automatically loading bolt, automatically load butterfly spring and adjusting nut composition, lip seal snare is on bearing pin, the sealing of composition first, this tapered collar filler is located at respectively the upper of bearing pin, lower two ends also form second sealing with bearing pin, O RunddichtringO is arranged on automatic loading gland inwall, form three seals with bearing pin, emergent loop device is arranged on, between lower two groups of tapered collar fillers, communicate with through hole on valve body.
7. a kind of heavy caliber tilting safety check according to claim 6, this automatically loads butterfly spring and is located on automatic loading bolt, spring one side is resisted against automatic loading pressing plate one side and is resisted against adjusting nut, automatically loads gland level and is resisted against automatic loading pressing plate one side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320824163.2U CN203670925U (en) | 2013-12-12 | 2013-12-12 | Large-caliber slant type check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320824163.2U CN203670925U (en) | 2013-12-12 | 2013-12-12 | Large-caliber slant type check valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203670925U true CN203670925U (en) | 2014-06-25 |
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ID=50967222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320824163.2U Expired - Fee Related CN203670925U (en) | 2013-12-12 | 2013-12-12 | Large-caliber slant type check valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203670925U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103697200A (en) * | 2013-12-12 | 2014-04-02 | 保一集团有限公司 | Large-caliber inclined check valve |
-
2013
- 2013-12-12 CN CN201320824163.2U patent/CN203670925U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103697200A (en) * | 2013-12-12 | 2014-04-02 | 保一集团有限公司 | Large-caliber inclined check valve |
| CN103697200B (en) * | 2013-12-12 | 2016-05-25 | 保一集团有限公司 | A kind of heavy caliber tilting check-valves |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| 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: 20140625 Termination date: 20201212 |