CN203322407U - Safety valve - Google Patents
Safety valve Download PDFInfo
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- CN203322407U CN203322407U CN2013203136697U CN201320313669U CN203322407U CN 203322407 U CN203322407 U CN 203322407U CN 2013203136697 U CN2013203136697 U CN 2013203136697U CN 201320313669 U CN201320313669 U CN 201320313669U CN 203322407 U CN203322407 U CN 203322407U
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- magnetic part
- safety valve
- closure member
- passage
- valve body
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Abstract
The utility model discloses a safety valve comprising a valve body, a closing member, a first magnetic member and a second magnetic member. The valve body is provided with a passage. The closing member is disposed on the valve body in such manner that the closing member is capable of moving between a position, opening the passage, and another position, closing the passage. The first magnetic member is arranged on the closing member. The second magnetic member is arranged on the valve body. Under the mutual action of the second and first magnetic members, a body of the closing member experiences moving force of the closing member constantly. The safety valve is simple in structure, convenient to assembly and low in cost; the safety valve can be opened fast, the adverse influence caused by the action of friction in the prior art is also avoided, processing precision of the safety valve is less demanding, the cost of the safety valve is low, and stability of the safety valve is higher.
Description
Technical field
The utility model relates to safety installation manufacturing technology field, particularly a kind of safety valve.
Background technique
The most safety valve is all to adopt spring force to withstand spool to seal valve port, when gas pressure during higher than spring force, spring is compressed, safety valve is opened and is realized exhaust, this safety valve is with the movement of spool, and amount of spring compression increases, and the power of spring action on spool is also along with increase, this opens rapidly safety valve is disadvantageous, and the safety pressure value can be subject to flow effect larger.Direct spring loaded safety valve generally all can be subject to the impact of frictional force, and to maintain the stable of safety pressure value, requirement on machining accuracy to the performance requirements such as the material of spring, fatigue and correlated parts is higher, virtually can increase cost, and the stability of general spring formula safety valve is not fine.
The model utility content
The utility model one of is intended to solve the problems of the technologies described above at least to a certain extent or at least provides a kind of useful business to select.For this reason, a purpose of the present utility model is to propose a kind of simple in structure and unlatching safety valve fast.
According to safety valve of the present utility model, comprising: valve body, closure member, the first magnetic part and the second magnetic part.Particularly, be provided with passage in described valve body; Described closure member is at the open position of opening described passage and close between the closed position of described passage and be located at movably on described valve body; Described the first magnetic part is located on described closure member; Described the second magnetic part is located on described valve body, and described the second magnetic part and described the first magnetic part interact and to make the main body portion of described closure member often be subject to the power moved to described closed position.
According to safety valve of the present utility model, control the opening and closing of closure member by the magnetic force between the first magnetic part and the second magnetic part, make the simple in structure of safety valve, easy to assembly and cost is low, and avoid adopting spring to control closure member, not only can be so that the opening fast of safety valve, but also the harmful effect of having avoided in the conventional art effect due to frictional force to bring, reduced the requirement on machining accuracy of safety valve, make the cost of safety valve low, and improved the stability of safety valve, improved the Safety performance of equipment.
In addition, the above-mentioned safety valve according to the utility model can also have following additional technical characteristics:
The wall of described passage is provided with to the flange extended in described passage, at the described closure member of described closed position, is pressed on described flange.Thus, simplify the structure of safety valve, made the valve body convenient formation, and be convenient to production and the assembling of safety valve, improved the manufacturing efficiency of safety valve, and reduced the fabricating cost of safety valve, there is higher practicability.
Surface away from the entrance of described passage on described flange is provided with annular boss, at the described closure member of described closed position, is pressed on described annular boss.Thus, be convenient to further the closure member closing passage, improved the sealing of closure member closing passage, adopt boss to coordinate with closure member, reduced the required precision of closure member, make the closure member can rapid shaping, not only improve the shaping efficiency of closure member, and reduced the moulding cost of closure member.
Described the first magnetic part is located on described closure member on the surface away from the entrance of described passage, described the second magnetic part is located in described passage and is positioned at the side of described closure member towards the entrance of described passage, and described the first magnetic part and described the second magnetic part attract each other.Thus, under the magnetic force between the first magnetic part and the second magnetic part, the first magnetic part stably is located on the surface of closure member, has improved the stability of the first magnetic part.
Also comprise regulating spool, described regulating spool is being located in described passage movably away from described the first magnetic part with near on the direction of described the first magnetic part, and described the second magnetic part is located on described regulating spool.Thus, can regulate the distance between the first magnetic part and the second magnetic part by regulating spool, distance between the first magnetic part and the second magnetic part hour, the cracking pressure of safety valve is large, and, when the distance between the first magnetic part and the second magnetic part is larger, the cracking pressure of safety valve is little.
The inwall of described regulating spool and described passage is threaded connection.Thus, make stable being arranged on valve body of regulating spool, improved the stability of regulating spool, in addition, needs regulate between the first magnetic part and the second magnetic part apart from the time, can the rotating regulation valve core, the first magnetic part is approached or away from the second magnetic part, and can make regulating spool stable be parked in precalculated position, make interval intended distance stable between the first magnetic part and the second magnetic part, and realized the electrodeless adjusting of span between the first magnetic part and the second magnetic part.Improve the Applicable scope of safety valve, increased the practicability of safety valve.
Be formed with the hole with described channel connection in described regulating spool, and be provided with seal ring between the internal face of the outer wall of described regulating spool and described passage.Thus, when safety valve safety is on equipment, can makes regulating spool be connected with other element of equipment, thereby realize the installation of safety valve, be convenient to mounting safety valve, improve the installation efficiency of safety valve.
Described closure member comprises joint and the board body part that can close described passage, and described board body part is provided with for holding the draw-in groove of described the first magnetic part, and the first end of described joint is connected with described board body part and the second end is connected with described valve body.Thus, not only make the described passage of closing that Sealing can be stable, and in the process moved at Sealing, it is stable that closure member can keep, and improved the stability of closure member, the Security that has improved safety valve.
Also comprise valve gap, described valve gap is arranged on described valve body, and described valve gap coordinates the second end that compresses described joint with described valve body.Thus, be convenient to the installation of closure member, improved the installation efficiency of closure member, save time.
Described joint is arc, and the described joint of arc often has the power that compresses described board body part to described closed position.Thus, improve the stability in the board body part moving process, made stable the moving of closure member between open position and closed position, improved further the stability of safety valve.And the elastic reaction of the joint of arc can increase the power to board body part, improved the Applicable scope of safety valve.
Center in described valve gap is provided with through hole.Thus, make fluid fast by safety valve, be convenient to quick pressure releasing, improved Safety performance.
Additional aspect of the present utility model and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present utility model.
The accompanying drawing explanation
Above-mentioned and/or additional aspect of the present utility model and advantage are from obviously and easily understanding becoming embodiment's description in conjunction with following accompanying drawing, wherein:
Fig. 1 is the sectional view of an embodiment's of the present utility model safety valve;
Fig. 2 is the sectional view of another embodiment's of the present utility model safety valve.
Embodiment
Below describe embodiment of the present utility model in detail, described embodiment's example is shown in the drawings, and wherein same or similar label means same or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment who is described with reference to the drawings, be intended to for explaining the utility model, and can not be interpreted as restriction of the present utility model.
In description of the present utility model, it will be appreciated that, term " " center ", " vertically ", " laterally ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", orientation or the position relationship of indications such as " counterclockwise " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as restriction of the present utility model.
In addition, term " first ", " second " be only for describing purpose, and can not be interpreted as indication or hint relative importance or the implicit quantity that indicates indicated technical characteristics.Thus, one or more these features can be expressed or impliedly be comprised to the feature that is limited with " first ", " second ".In description of the present utility model, the implication of " a plurality of " is two or more, unless otherwise expressly limited specifically.
In the utility model, unless otherwise clearly defined and limited, broad understanding should be done in the terms such as term " installation ", " being connected ", " connection ", " fixing ", for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be mechanical connection, can be also to be electrically connected to; Can be directly to be connected, also can indirectly be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term in the utility model.
In the utility model, unless otherwise clearly defined and limited, First Characteristic Second Characteristic it " on " or D score can comprise that the first and second features directly contact, also can comprise that the first and second features are not directly contacts but by the other feature contact between them.And, First Characteristic Second Characteristic " on ", " top " and " above " comprise First Characteristic directly over Second Characteristic and oblique upper, or only mean that the First Characteristic level height is higher than Second Characteristic.First Characteristic Second Characteristic " under ", " below " and " below " comprise First Characteristic under Second Characteristic and tiltedly, or only mean that the First Characteristic level height is less than Second Characteristic.
The most safety valve is all to adopt spring force to withstand spool to seal valve port, when gas pressure during higher than spring force, spring is compressed, safety valve is opened and is realized exhaust, this safety valve is with the movement of spool, and amount of spring compression increases, and the power of spring action on spool is also along with increase, this opens rapidly safety valve is disadvantageous, and the safety pressure value can be subject to flow effect larger.Direct spring loaded safety valve generally all can be subject to the impact of frictional force, and to maintain the stable of safety pressure value, requirement on machining accuracy to the performance requirements such as the material of spring, fatigue and correlated parts is higher, virtually can increase cost, and the stability of general spring formula safety valve is not fine.For this reason, the utility model proposes a kind of by the safety valve of Magnetic Control.
Describe with reference to the accompanying drawings the utility model embodiment's safety valve in detail.
As depicted in figs. 1 and 2, the safety valve according to the utility model embodiment comprises: valve body 10, closure member 20, the first magnetic part 31 and the second magnetic part 32.
Particularly, be provided with the passage (not shown) in valve body 10, and valve body 10 is provided with fluid input and the fluid output that is communicated with described passage.Closure member 20 is at the open position of opening described passage and close between the closed position of described passage and be located at movably on valve body 10.Fig. 1 is the schematic diagram of closure member 20 when in the closed position, and now closure member 20 is closed described passage, makes can't flow out from fluid output from the fluid in the fluid input inlet passage; When the pressure of fluid reaches predetermined value, fluid is larger to the pressure of closure member 20, closure member 20 is moved, as shown in Figure 2 to open position.The first magnetic part 31 is located on closure member 20.The second magnetic part 32 is located on valve body 10, and the second magnetic part 32 and the first magnetic part 31 interact and make the main body portion of closure member 20 often be subject to the power moved to described closed position.In other words, the interaction of the first magnetic part 31 and the second magnetic part 32, make closure member 20 often be subject to closing the power of described passage.
Safety valve according to the utility model embodiment, control the opening and closing of closure member 20 by the magnetic force between the first magnetic part 31 and the second magnetic part 32, make the simple in structure of safety valve, easy to assembly and cost is low, and avoid adopting spring to control closure member, not only can be so that the opening fast of safety valve, but also the harmful effect of having avoided in the conventional art effect due to frictional force to bring, reduced the requirement on machining accuracy of safety valve, make the cost of safety valve low, and improved the stability of safety valve, improved the Safety performance of equipment.
Safety valve of the present utility model can be used as the safety valve in air pressure and hydraulic pressure etc., applied range.
As shown in Figure 1, in embodiments more of the present utility model, the wall of described passage is provided with to the flange 11 extended in described passage, at described closed position closure member 20, is pressed on flange 11.Thus, simplify the structure of safety valve, made valve body 10 convenient formation, and be convenient to production and the assembling of safety valve, improved the manufacturing efficiency of safety valve, and reduced the fabricating cost of safety valve, there is higher practicability.
Advantageously, the surface away from the entrance (not shown) of described passage on flange 11 is provided with annular boss 12, at described closed position closure member 20, is pressed on annular boss 12.Thus, be convenient to further closure member 20 closing passages, improved the sealing of closure member 20 closing passages, adopt boss to coordinate with closure member 20, reduced the required precision of closure member 20, make the closure member 20 can rapid shaping, not only improved the shaping efficiency of closure member 20, and reduced the moulding cost of closure member 20.
Further, the first magnetic part 31 is located on closure member 20 on the surface away from the entrance of described passage, the second magnetic part 32 is located in described passage and is positioned at the side of closure member 20 towards the entrance of described passage, and the first magnetic part 31 and the second magnetic part 32 attract each other.Thus, under the magnetic force between the first magnetic part 31 and the second magnetic part 32, the first magnetic part 31 stably is located on the surface of closure member 20, has improved the stability of the first magnetic part 31.
Particularly, as shown in Figure 1, the first magnetic part 31 is located at the upper surface of closure member 20, and the second magnetic part 32 is located at the below of described closure member 20, and the first magnetic part 31 and the second magnetic part 32 attract each other.
Further, described safety valve also comprises regulating spool 40, and regulating spool 40 is being located in described passage movably away from the first magnetic part 31 with near on the direction of the second magnetic part 32, and the second magnetic part 32 is located on regulating spool 40.Thus, the distance that can regulate between the first magnetic part 31 and the second magnetic part 32 by regulating spool 40, distance between the first magnetic part 31 and the second magnetic part 32 hour, the cracking pressure of safety valve is large, and, when the distance between the first magnetic part 31 and the second magnetic part 32 is larger, the cracking pressure of safety valve is little.
In addition, the first magnetic part 31 and the second magnetic part 32 all can also be located to a side of the entrance away from described passage of closure member 20, and the first magnetic part 31 is connected with closure member 20, the first magnetic part 31 and the second magnetic part 32 repel mutually.Perhaps, the first magnetic part 31 and the second magnetic part 32 all are located to a side of the entrance towards described passage of closure member 20, the first magnetic part 31 is fixed on closure member 20, and the first magnetic part 31 and the second magnetic part 32 repel mutually.
Advantageously, in order to improve the stability of the first magnetic part 31, the first magnetic part 31 can also be fixed on closure member 20 by modes such as adhesions.
Advantageously, regulating spool 40 is threaded connection with the inwall of described passage.
In addition, can also on the inwall of described passage or regulating spool 40, limit structure be set, make regulating spool 40 can be parked in precalculated position.Certainly, the mode of above-mentioned adjusting regulating spool 40 is only concrete examples more of the present utility model, for known other structures of regulating the position of regulating spool 40 in technology are originally arranged, the utility model is not elaborated, and this is understandable for those of ordinary skill in the art.
Further, in regulating spool 40, be formed with and the internal face of the outer wall in the 401，Qie hole, hole 401 of described channel connection and described passage between be provided with seal ring 50.Thus, when safety valve safety is on equipment, can makes regulating spool 40 be connected with other element of equipment, thereby realize the installation of safety valve, be convenient to mounting safety valve, improve the installation efficiency of safety valve.
As shown in Figure 1, in embodiments more of the present utility model, closure member 20 comprises joint 21 and can close the board body part 22 of described passage, board body part 22 is provided with for holding the draw-in groove (not shown) of the first magnetic part 31, the first end of joint 21 (as shown in Figure 1 downward an end) is connected with board body part 22, and the second end of joint 21 (end made progress as shown in Figure 1) is connected with valve body 10.Thus, not only make the described passage of closing that Sealing 20 can be stable, and in the process moved at Sealing 20, it is stable that closure member 20 can keep, and improved the stability of closure member 20, the Security that has improved safety valve.
In addition, described safety valve also comprises valve gap 60, and valve gap 60 is arranged on valve body 10, and valve gap 60 coordinates the second end that compresses joint 21 with valve body 10.Thus, be convenient to the installation of closure member 20, improved the installation efficiency of closure member 20, save time.
Particularly, as shown in Figure 1, described passage connects valve body 10, and the top of the wall of passage is provided with mounting groove, and valve gap 60 is provided with the fin coordinated with described mounting groove, the second end of joint 21 is located in described mounting groove, and described fin is pressed on the second end of joint 21.
Advantageously, joint 21 is arc, and the joint 21 of arc often has the power that compresses board body part 22 to described closed position.Thus, improve the stability in board body part 22 moving process, made stable the moving of closure member 20 between open position and closed position, improved further the stability of safety valve.And the elastic reaction of the joint 21 of arc can increase the power to board body part 22, has improved the Applicable scope of safety valve.
In addition, the center in valve gap 60 is provided with through hole 601.Thus, make fluid fast by safety valve, be convenient to quick pressure releasing, improved Safety performance.
The utility model embodiment's structure and working principle thereof are simply described with reference to the accompanying drawings.
In the present embodiment, safety valve is for pneumatic compression devices, and safety valve of the present utility model is the magnetic force diaphragm-type safety valve.The utility model adopts magnetic force to overcome the active force that closure member 20 produces under the effect of gas pressure, the gas pressure be subject to when closure member 20 is during higher than the elastic force of the magnetic force of setting and closure member 20, the closure member 20 of safety valve is opened and is realized exhaust, and along with closure member 20 is opened, distance between the first magnetic part 31 and the second magnetic part 32 increases, the suction that the first magnetic part 31 and the second magnetic part are 32 reduces, so the unlatching of closure member 20 is rapid, and gas pressure can lower rapidly.The utility model adopts diaphragm type closure member 20 to support the first magnetic part 31 sealing, makes safety valve not affected by frictional force, has improved speed of response and the stability of safety valve.Whole technical performances and index with Direct spring loaded safety valve, and it is simple in structure, the Set pressure adjustment range large, open fast response time, cracking pressure is stable and can accurately set, use for a long time indefatigability, easy to use, safe and reliable.
The utility model embodiment's safety valve comprises: valve gap 60, closure member 20, the first magnetic parts 31, valve body 10, the second magnetic parts 32, seal ring 50 and regulating spool 40.Valve gap 60, by with valve body 10, being connected closure member 20 is fixed between them, offers the through hole 601 be communicated with ambient atmosphere on valve gap 60.Closure member 20 use elastic caoutchouc class materials are made, and arch Bao Huan district is arranged in closure member 20, and closure member 20 intermediate portions stud with the first magnetic part 31, the first magnetic parts 31 and can move up and down with closure member 20 intermediate portions.Valve body 10 is provided with through hole and sealed mouth and relief opening, and valve body 10 is threaded connection with regulating spool 40, is provided with seal ring 50 therebetween.The second magnetic part 32 is fixed on an end of regulating spool 40, and regulating spool 40 is provided with hole 401, and regulating spool 40 the other ends connect air-channel system.Concrete structure as shown in Figure 1.
Working principle: when the gas pressure of hole 401 inputs from regulating spool 40 hangs down, closure member 20 is because the suction of the first magnetic part 31 and the second magnetic part 32 moves downward the sealed mouth that seals valve body 10, close described passage, now safety valve is in the closed position, not exhaust (as shown in Figure 1).When the gas pressure of the input of the hole 401 from regulating spool 40 surpasses the elastic force of link of suction between the first magnetic part 31 and the second magnetic part 32 and closure member 20; closure member 20 and the first magnetic part 31 move upward; safety valve is opened exhaust (as shown in Figure 2); and along with closure member 20 and the first magnetic part 31 move up; distance between the first magnetic part 31 and the second magnetic part 32 increases; suction between them diminishes; therefore safety valve can be opened rapidly; and the pressure after opening reduces rapidly, play the effect of protection air-channel system.The cracking pressure value of safety valve is set and can be realized by the distance of regulating between regulating spool 40 change the first magnetic parts 31 and the second magnetic part 32, distance is large, the safety pressure setting value of safety valve is just little, otherwise distance is little, and the safety pressure setting value of safety valve is just large.Basically there are not frictional force in closure member 20 and the first magnetic part 31 in the process of moving up and down, and therefore can improve the stability of safety valve, reduce requirement on machining accuracy.
In the description of this specification, the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present utility model or example in conjunction with specific features, structure, material or the characteristics of this embodiment or example description.In this manual, the schematic statement of above-mentioned term not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or characteristics can be with suitable mode combinations in any one or more embodiments or example.
Although the above has illustrated and has described embodiment of the present utility model, be understandable that, above-described embodiment is exemplary, can not be interpreted as restriction of the present utility model, those of ordinary skill in the art is not in the situation that break away from principle of the present utility model and aim can be changed above-described embodiment in scope of the present utility model, modification, replacement and modification.
Claims (11)
1. a safety valve, is characterized in that, comprising:
Valve body, be provided with passage in described valve body;
Closure member, described closure member is at the open position of opening described passage and close between the closed position of described passage and be located at movably on described valve body;
The first magnetic part, described the first magnetic part is located on described closure member; With
The second magnetic part, described the second magnetic part is located on described valve body, and described the second magnetic part and described the first magnetic part interact and to make the main body portion of described closure member often be subject to the power moved to described closed position.
2. safety valve according to claim 1, is characterized in that, the wall of described passage is provided with to the flange extended in described passage, at the described closure member of described closed position, is pressed on described flange.
3. safety valve according to claim 2, is characterized in that, the surface away from the entrance of described passage on described flange is provided with annular boss, at the described closure member of described closed position, is pressed on described annular boss.
4. safety valve according to claim 2, it is characterized in that, described the first magnetic part is located on described closure member on the surface away from the entrance of described passage, described the second magnetic part is located in described passage and is positioned at the side of described closure member towards the entrance of passage, and described the first magnetic part and described the second magnetic part attract each other.
5. safety valve according to claim 4, it is characterized in that, also comprise regulating spool, described regulating spool is being located in described passage movably away from described the first magnetic part with near on the direction of described the first magnetic part, and described the second magnetic part is located on described regulating spool.
6. safety valve according to claim 5, is characterized in that, the inwall of described regulating spool and described passage is threaded connection.
7. safety valve according to claim 5, is characterized in that, is formed with the hole with described channel connection in described regulating spool, and is provided with seal ring between the internal face of the outer wall of described regulating spool and described passage.
8. safety valve according to claim 1, it is characterized in that, described closure member comprises joint and can close the board body part of described passage, described board body part is provided with for holding the draw-in groove of described the first magnetic part, and the first end of described joint is connected with described board body part and the second end is connected with described valve body.
9. safety valve according to claim 8, is characterized in that, also comprises valve gap, and described valve gap is arranged on described valve body, and described valve gap coordinates the second end that compresses described joint with described valve body.
10. safety valve according to claim 8, is characterized in that, described joint is arc, and the described joint of arc often has the power that compresses described board body part to described closed position.
11. safety valve according to claim 8, is characterized in that, the center in described valve gap is provided with through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203136697U CN203322407U (en) | 2013-05-31 | 2013-05-31 | Safety valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203136697U CN203322407U (en) | 2013-05-31 | 2013-05-31 | Safety valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203322407U true CN203322407U (en) | 2013-12-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203136697U Expired - Fee Related CN203322407U (en) | 2013-05-31 | 2013-05-31 | Safety valve |
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| CN (1) | CN203322407U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104214378A (en) * | 2013-05-31 | 2014-12-17 | 北京谊安医疗系统股份有限公司 | Safety valve |
-
2013
- 2013-05-31 CN CN2013203136697U patent/CN203322407U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104214378A (en) * | 2013-05-31 | 2014-12-17 | 北京谊安医疗系统股份有限公司 | Safety valve |
| CN104214378B (en) * | 2013-05-31 | 2019-06-25 | 北京谊安医疗系统股份有限公司 | Safety valve |
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| Date | Code | Title | Description |
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| 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: 20131204 Termination date: 20180531 |