CN111102397A - Nuclear energy safety relief valve and position indicator device - Google Patents
Nuclear energy safety relief valve and position indicator device Download PDFInfo
- Publication number
- CN111102397A CN111102397A CN201811261142.8A CN201811261142A CN111102397A CN 111102397 A CN111102397 A CN 111102397A CN 201811261142 A CN201811261142 A CN 201811261142A CN 111102397 A CN111102397 A CN 111102397A
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- coil
- shell
- relief valve
- position indicator
- indicator device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0025—Electrical or magnetic means
- F16K37/0041—Electrical or magnetic means for measuring valve parameters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0675—Electromagnet aspects, e.g. electric supply therefor
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
Abstract
本发明涉及一种核能安全泄压阀及位置指示器装置，包括外壳，所述外壳内部设置有一端开口的滑腔，所述滑腔中设置有导杆，所述滑腔与导杆之间设置有用于使得导杆始终具有向滑腔外运动势的弹性件，所述外壳背离滑腔开口端设置有用于检测导杆是否移动的差动电感式位移传感器，能保证安全泄压阀阀杆位移及位置能及时、精确被监测，具有较高的可靠性，并具有使用成本低的优点，且在后期维修与维护时可直接将外壳取下维修，维修简单方便。
The invention relates to a nuclear energy safety pressure relief valve and a position indicator device, comprising a casing, wherein a sliding cavity with one end open is arranged inside the casing, a guide rod is arranged in the sliding cavity, and a gap between the sliding cavity and the guide rod is provided. An elastic member is provided for the guide rod to always have the potential to move to the outside of the sliding chamber, and a differential inductive displacement sensor for detecting whether the guide rod is moved is provided at the open end of the casing away from the sliding chamber, which can ensure the safety of the pressure relief valve stem. The displacement and position can be monitored timely and accurately, with high reliability and low cost of use, and the casing can be directly removed for maintenance during later maintenance and maintenance, which is simple and convenient for maintenance.
Description
Technical Field
The invention relates to the technical field of nuclear power safety relief valves, in particular to a nuclear power safety relief valve and a position indicator device.
Background
The pilot-operated safety relief valve is one of important equipment of a pressurized water reactor nuclear power station, is used as a safety guarantee of a primary circuit system under an accident condition, directly influences the reliability and the safety of the operation of the nuclear power station, automatically opens when the pressure in the system rises and exceeds a setting value of the relief valve, and discharges a system medium through a main valve part to prevent the system from continuously boosting; when the pressure is reduced to the recoil pressure, the valve can be automatically closed in time, and the system can be ensured to continuously and safely operate. The main valve functions to realize the discharge of the system medium. When the nuclear reactor system is in an overpressure condition, if the main valve of the safety valve is not opened or does not return to the seat after being opened, serious accidents can be caused.
The patent application with application publication number CN106286959A discloses a main valve device for a pilot operated safety valve system, which comprises an upper seal head and a valve body, wherein the top of the upper seal head is provided with a position indicator; the bottom end of the upper end enclosure is arranged at the upper end of the valve body, a position sensing block and a connecting rod are sequentially arranged in the upper end enclosure from top to bottom, and the sensing block is connected with the connecting rod; the valve body is internally provided with a reset spring, a valve rod, a piston assembly, a valve clack assembly and a valve seat in sequence from top to bottom, the valve rod is connected with a connecting rod, the piston assembly is arranged on the valve rod positioned in a steel lining, the bottom of the valve rod is provided with the valve clack, the valve clack is tightly attached to the valve seat, the valve seat is fixed at the bottom of the valve body, the reset spring is sleeved on the valve rod, the top end of the reset spring acts in the upper end socket, and the bottom end of the reset spring acts on; the side surface of the upper part of the valve body is provided with a plurality of flow passage holes, the flow passage holes are communicated with a main valve piston cavity in the valve body, the side surface of the upper part of the valve body is provided with a main valve inlet, and the bottom end of the valve body is provided with a main valve outlet. The valve stem will be displaced along its axis when the safety valve is opened and closed.
The pilot-operated safety relief valve body can not directly display the opening and closing states of the current valve and the position of the valve rod, so that a position indicator is required to be adopted to detect the displacement of the valve rod, the existing valve position indicator is totally dependent on an inlet, and the use cost is high.
Disclosure of Invention
A first object of the present invention is to provide a nuclear safety relief valve position indicator device that has the advantage of low cost of use.
The first object of the present invention is achieved by the following technical solutions: the utility model provides a nuclear energy safety pressure release valve position indicator device, includes the shell, the inside one end open-ended sliding chamber that is provided with of shell, be provided with the guide arm in the sliding chamber, be provided with between sliding chamber and the guide arm and be used for making the guide arm have the elastic component to the outer motion potential of sliding chamber all the time, the shell deviates from the sliding chamber open end and is provided with the differential inductance formula displacement sensor who is used for detecting whether the guide arm removes.
Through the technical scheme, during the use, install the shell on the relief valve, and make the open end of sliding chamber inside towards the relief valve, and let the guide arm stretch into in the relief valve, the elastic component will promote guide arm and valve rod contact all the time, if axial displacement takes place for the valve rod, will promote the guide arm and take place the removal, differential inductance type sensor will detect the guide arm removal this moment, and then export corresponding signal, make people's convenient clear understanding whether the valve rod removes, and then judge whether the relief valve opens, because equipment can oneself assemble and install completely, therefore its cost is lower, can save more cost after using on the safety relief valve, and can directly take off the shell maintenance when later maintenance and maintenance, easy and convenient maintenance.
Preferably, differential inductance type displacement sensor deviates from the metal framework of sliding chamber open end, around establishing the magnetizer that deviates from the sliding chamber open end in metal framework, second coil and setting at the guide arm including setting up at the shell, the magnetizer that the magnetizer lies in first coil and second coil inside, metal framework encircles the shell setting, be provided with two wire winding chambeies in the metal framework, the wire winding chamber sets up from the shell side opening dorsad, first coil and second coil are all around locating in the wire winding chamber, first coil and second coil and two wire winding chamber one-to-ones, the metal framework open end is provided with the lid.
By the technical scheme, when the magnetizer is positioned at the middle position of the first coil and the second coil through the externally input excitation voltage with certain frequency, the induced electromotive forces generated by the first coil and the second coil are equal, so that the output voltage is zero, when the magnetizer moves in the first coil and the second coil and deviates from the central positions of the first coil and the second coil, the induced electromotive forces generated by the first coil and the second coil are unequal, voltage is output, the output voltage depends on the displacement, and the output voltage value is in linear relation with the displacement of the magnetizer, so the moving distance of the magnetizer can be obtained according to the linear relation, namely the moving distance of the guide rod, is simple and convenient to detect, and simultaneously, because the device is used in a nuclear power station, therefore, the first coil and the second coil can work in a high-temperature and high-irradiation environment, and the first coil and the second coil can be maintained in time by arranging the cover body.
Preferably, a high-temperature irradiation resistant potting adhesive layer is arranged between the cover body and the first coil and between the cover body and the second coil.
Through the technical scheme, the first coil and the second coil are packaged by the high-temperature-resistant and high-irradiation-resistant pouring sealant layer, so that the device can adapt to the high-irradiation and high-temperature working conditions possibly occurring in the field of a nuclear power station.
Preferably, high-temperature irradiation resistant insulating layers are arranged between the metal framework and the first coil and between the metal framework and the second coil.
Through above-mentioned technical scheme, for avoiding first coil and second coil to switch on with metal framework under high temperature, the high irradiation condition, adopt the insulating layer that insulating properties is excellent to keep apart between first coil, second coil and metal framework, ensure that equipment stable operation.
Preferably, the outer wall of the outer shell at the opening end of the sliding cavity is provided with a locking thread used for being matched with the safety valve.
Through the technical scheme, in order to conveniently install the device on the safety valve, the shell is provided with the locking thread, and the shell is connected with the safety valve through the locking thread during use.
Preferably, the locking nut used for abutting against the safety valve is sleeved on the shell through threads, and the locking nut is located on the side, away from the opening side of the sliding cavity, of the locking threads.
Through the technical scheme, because produce vibrations etc. easily at the nuclear power station, consequently the shell is connected the back with the relief valve and produces not hard up because of vibrations steam etc. easily, in order to prevent effectively that this kind of condition from taking place, be provided with lock nut on the shell, back on with shell screw in relief valve, rotatory lock nut, make lock nut be close to and contradict with the relief valve outer wall to the relief valve, lock nut will make to produce the butt between the locking screw thread on the shell and the relief valve this moment, the frictional force between casing and the relief valve has been increased, make the casing difficult to produce between vibrations and the relief valve not hard up.
Preferably, one end of the guide rod extends out of the shell, and a smooth and wear-resistant rolling ball is arranged at the end part of the guide rod, which is located outside the shell.
Through above-mentioned technical scheme, when using, produce the friction between the valve rod in the relief valve can and the guide arm, through set up the spin at the guide arm tip, can roll and reduce the frictional force between guide arm and the valve rod between valve rod and the guide arm with the spin for also make the axial motion of valve rod difficult by the influence when guide arm and valve rod are difficult by wearing and tearing, can not influence the sensitivity of relief valve promptly.
Preferably, the guide rod is provided with a breaking groove close to the end of the rolling ball.
Through the technical scheme, the phenomenon that blocks can take place for the guide arm under some emergency, make the difficult axial motion that takes place of valve rod, the guide arm will influence the valve rod motion this moment, and then make the relief valve can not in time close or open, can make the great needs of valve rod atress open or break the guide arm when closing through being provided with the rupture groove on the guide arm, and then avoid the guide arm to die the valve rod card and make the condition that the valve rod can not move take place, wait until later stage maintenance removable down the shell then take out the guide arm of rupture more renew can, safe and reliable more during the use.
The second purpose of the invention is to provide a nuclear energy safety relief valve which has the advantage of low use cost.
The second object of the present invention is achieved by the following technical solutions: the utility model provides a nuclear energy safety relief valve, includes above-mentioned technical scheme a nuclear energy safety relief valve position indicator device, still include the relief valve body, the relief valve body includes casing and the valve rod of setting in the casing, be provided with the inclined plane on the valve rod, the inclined plane is the acute angle setting with the central axis of valve rod, casing one side is provided with the through-hole, the shell is located the sliding chamber open end and connects in the through-hole, the guide arm is located the one end outside the sliding chamber and contradicts with the inclined plane.
Through the technical scheme, during the use, the through-hole has been seted up along the axial direction of perpendicular valve rod on the casing, then insert the through-hole with the one end that the shell has locking screw thread, the guide arm that is located in the sliding chamber this moment will insert in the casing and contradict with the inclined plane, because the effect of elastic component, consequently the guide arm tip will contact with the inclined plane all the time, when the relief valve body is opened and is closed, the valve rod will produce axial motion, the guide arm will take place to remove under the effect of inclined plane and elastic component this moment, can detect out the motion of guide arm through differential inductance type displacement sensor, and then judge valve rod displacement, clear understanding the relief valve body whether open and close.
In summary, compared with the prior art, the beneficial effects of the invention are as follows:
1. the valve rod movement detection is simple and convenient, the detection structure is simple and convenient to assemble, and the cost is lower;
2. because protective measures such as pouring sealant and the like are adopted in the use, the device can normally work for a long time when being used in the environments such as a nuclear power station and the like with high temperature, high radiation and the like;
3. through setting up breaking groove and spin, increased the reliability of equipment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram according to a first embodiment;
fig. 2 is a schematic structural diagram of the second embodiment.
Reference numerals: 1. rolling a ball; 2. a guide bar; 3. locking the threads; 4. a slide chamber; 5. locking the nut; 6. an elastic member; 7. a magnetizer; 8. a cylindrical pin; 9. a metal skeleton; 10. a housing; 11. a first coil; 12. a second coil; 13. pouring a sealing adhesive layer; 14. a cover body; 15. breaking the groove; 16. a housing; 17. a valve stem; 18. an inclined surface; 19. a through hole; 20. and a winding cavity.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows:
as shown in fig. 1, a nuclear energy safety pressure relief valve position indicator device includes a housing 10, a sliding cavity 4 with an opening at one end is arranged inside the housing 10, a guide rod 2 is arranged in the sliding cavity 4, an elastic member 6 is arranged between the sliding cavity 4 and the guide rod 2, and a differential inductive displacement sensor is arranged at an opening end of the housing 10 away from the sliding cavity 4, in this embodiment, the elastic member 6 is a spring, one end of the spring is connected with an inner wall of the sliding cavity 4, and the other end of the spring is connected with the guide rod 2, and when a valve rod 17 in a safety valve moves, the guide rod 2 is driven to move, and at this time, the differential inductive displacement sensor detects a signal of the movement of the.
When the guide rod type wear-resistant rolling ball is used, one end of the guide rod 2 extends out of the shell 10, a smooth and wear-resistant rolling ball 1 is arranged at the end, located outside the shell 10, of the guide rod 2, the rolling ball is made of zirconia materials in the embodiment, and meanwhile, a breaking groove 15 is formed in the end, close to the rolling ball 1, of the guide rod 2.
The differential inductance type displacement sensor comprises a metal framework 9, a first coil 11, a second coil 12 and a magnetizer 7, wherein the metal framework 9 is arranged on a shell 10 and deviates from the opening end of a sliding cavity 4, the first coil 11 and the second coil 12 are wound in the metal framework 9, the magnetizer 7 is arranged on a guide rod 2 and deviates from the opening end of the sliding cavity 4, the magnetizer 7 is positioned inside the first coil 11 and the second coil 12, and the magnetizer 7 is fixed on the guide rod 2 through a cylindrical pin 8.
As shown in fig. 1, wherein the metal frame 9 is disposed around the housing 10, and two winding cavities 20 are disposed in the metal frame 9, an insulating layer is covered on the inner wall of the winding cavity 20, the first coil 11 and the second coil 12 are both wound in the winding cavity 20, to facilitate winding of the wire in the winding chamber 20, so that the winding chamber 20 is disposed away from the side opening of the housing 10, therefore, the winding can be conveniently carried out through the opening side of the winding cavity 20, the first coil 11 and the second coil 12 correspond to the two winding cavities 20 one by one, the cover body 14 is arranged at the opening end of the metal framework 9, the potting adhesive layer 13 is encapsulated in the winding cavity 20 after the first coil 11 and the second coil 12 are wound, then, the cover body 14 is covered on the opening of the metal framework 9 and welded, the pouring sealant is made of high-temperature-resistant and radiation-resistant materials and is poured in the winding cavity 20 to protect the first coil 11 and the second coil 12.
The insulating layer is made of a high-temperature-resistant, irradiation-resistant and insulating material so as to prevent the first coil 11 and the second coil 12 from being conducted with the metal framework 9 under the conditions of high temperature and high irradiation.
The working principle of the differential inductive displacement sensor used in the embodiment is the prior art, and like the XM-D21 series LVDT displacement sensor produced by Shanghai Ximin Automation equipment Limited company, a similar principle is used. Meanwhile, the invention is not limited to the differential inductance type displacement sensor selected in the embodiment, and the self-inductance or mutual inductance electromagnetic sensor with double coils or multiple coils can realize detection.
The potting adhesive layer 13 can be obtained by modifying epoxy resin, the epoxy value of the epoxy resin is controlled, and a proper curing agent is selected to control the reaction speed, the crosslinking degree, the grease and filler density, and the proportion and the dosage of the components, so that the temperature resistance, the irradiation resistance, the adhesive force and the air tightness of the potting adhesive are improved, and the density of the potting adhesive is reduced. The potting adhesive layer 13 can be made of a high-temperature-resistant and radiation-resistant potting adhesive.
Example two:
as shown in fig. 2, a nuclear energy safety relief valve, including embodiment one, still include the relief valve body, the relief valve body includes casing 16 and the valve rod 17 of setting in casing 16, is provided with inclined plane 18 on the valve rod 17, and inclined plane 18 and the central axis of valve rod 17 are the acute angle setting, and casing 16 one side is provided with through-hole 19, and shell 10 is located the sliding chamber 4 open end and connects in through-hole 19, and the one end that guide arm 2 is located the sliding chamber 4 outside contradicts with inclined plane 18.
When the guide rod is used, the through hole 19 is formed in the shell 16 along the axial direction perpendicular to the valve rod 17, then the end inserting part of the shell 10 is inserted into the through hole 19, the locking thread 3 is matched with the inner wall of the through hole 19, the guide rod 2 positioned in the sliding cavity 4 is inserted into the shell 16 and is abutted against the inclined surface 18, and the end part of the guide rod 2 is always in contact with the inclined surface 18 due to the action of the elastic part 6. When the safety valve body is opened and closed, the valve rod 17 moves axially, the inclined surface 18 moves relative to the guide rod 2, the rolling ball 1 at the end of the guide rod 2 rolls, friction between the inclined surface 18 and the guide rod 2 is reduced, then the guide rod 2 moves under the action of the inclined surface 18, detection of the position and the displacement of the guide rod 2 is achieved through a differential inductive displacement sensor, inductance is formed between the first coil 11 and the second coil 12 through external input excitation, when the magnetizer 7 is located at the middle position, the inductances at two ends are the same, inductance difference can be formed between the two coils when the magnetizer moves towards any one end, acquisition is performed through conversion circuits such as an electric bridge, digital or analog quantity signals are output through conversion, and then the position and the moving distance of the valve rod 17 can be judged.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. A nuclear safety relief valve position indicator device, characterized by: including shell (10), shell (10) inside is provided with one end open-ended cunning chamber (4), be provided with guide arm (2) in the cunning chamber (4), be provided with between cunning chamber (4) and guide arm (2) and be used for making guide arm (2) have elastic component (6) to the outside movement potential of cunning chamber (4) all the time, shell (10) deviate from cunning chamber (4) open end and are provided with the differential inductance formula displacement sensor who is used for detecting whether guide arm (2) remove.
2. The nuclear safety relief valve position indicator device of claim 1, wherein: the differential inductance type displacement sensor comprises a metal framework (9) arranged at the opening end of the shell (10) departing from the sliding cavity (4), a first coil (11) wound in the metal framework (9), a second coil (12) and a magnetizer (7) arranged at the opening end of the guide rod (2) departing from the sliding cavity (4), the magnetizer (7) is positioned inside the first coil (11) and the second coil (12), the metal framework (9) is arranged around the shell (10), two winding cavities (20) are arranged in the metal framework (9), the winding cavity (20) is arranged away from the side opening of the shell (10), the first coil (11) and the second coil (12) are wound in the winding cavity (20), the first coil (11) and the second coil (12) correspond to the two winding cavities (20) one by one, and a cover body (14) is arranged at the opening end of the metal framework (9).
3. The nuclear safety relief valve position indicator device of claim 2, wherein: and a high-temperature irradiation resistant potting adhesive layer (13) is arranged between the cover body (14) and the first coil (11) and between the cover body and the second coil (12).
4. The nuclear safety relief valve position indicator device of claim 2, wherein: and insulating layers resistant to high-temperature irradiation are arranged between the metal framework (9) and the first coil (11) and between the metal framework and the second coil (12).
5. The nuclear safety relief valve position indicator device of claim 1, wherein: and the outer wall of the outer shell (10) at the opening end of the sliding cavity (4) is provided with a locking thread (3) used for being matched with a safety valve.
6. The nuclear safety relief valve position indicator device of claim 5, wherein: the safety valve is characterized in that a locking nut (5) used for being abutted to the safety valve is sleeved on the shell (10) in a threaded mode, and the locking nut (5) is located on the opening side of the locking thread (3) departing from the sliding cavity (4).
7. The nuclear safety relief valve position indicator device of claim 1, wherein: one end of the guide rod (2) extends out of the shell (10), and a smooth and wear-resistant rolling ball (1) is arranged at the end part of the guide rod (2) located outside the shell (10).
8. The nuclear safety relief valve position indicator device of claim 7, wherein: the end of the guide rod (2) close to the rolling ball (1) is provided with a breaking groove (15).
9. A nuclear energy safety relief valve which characterized in that: the nuclear energy safety pressure relief valve position indicator device comprises a safety valve body and a safety valve body, wherein the safety valve body comprises a shell (16) and a valve rod (17) arranged in the shell (16), an inclined surface (18) is arranged on the valve rod (17), the inclined surface (18) and the central axis of the valve rod (17) are arranged in an acute angle, a through hole (19) is formed in one side of the shell (16), the shell (10) is located at the opening end of a sliding cavity (4) and is connected into the through hole (19), and one end, located outside the sliding cavity (4), of the guide rod (2) is abutted against the inclined surface (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811261142.8A CN111102397A (en) | 2018-10-26 | 2018-10-26 | Nuclear energy safety relief valve and position indicator device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811261142.8A CN111102397A (en) | 2018-10-26 | 2018-10-26 | Nuclear energy safety relief valve and position indicator device |
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| Publication Number | Publication Date |
|---|---|
| CN111102397A true CN111102397A (en) | 2020-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811261142.8A Pending CN111102397A (en) | 2018-10-26 | 2018-10-26 | Nuclear energy safety relief valve and position indicator device |
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| CN (1) | CN111102397A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4569365A (en) * | 1982-07-29 | 1986-02-11 | Framatome & Cie | Device for detecting the operation of a valve |
| CN202220765U (en) * | 2011-08-12 | 2012-05-16 | 山东泰丰液压股份有限公司 | Cartridge valve with valve core position detection and stroke limitation functions |
| CN202834350U (en) * | 2012-09-18 | 2013-03-27 | 哈尔滨电机厂有限责任公司 | Position indication device for movable sealing ring of water inlet valve in hydropower station |
| CN107940084A (en) * | 2016-10-12 | 2018-04-20 | 中核苏阀科技实业股份有限公司 | A Non-contact Valve Position Indicating Mechanism |
| CN209084141U (en) * | 2018-10-26 | 2019-07-09 | 四川日机密封件股份有限公司 | A kind of nuclear energy safety relief valve and position indicator device |
-
2018
- 2018-10-26 CN CN201811261142.8A patent/CN111102397A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4569365A (en) * | 1982-07-29 | 1986-02-11 | Framatome & Cie | Device for detecting the operation of a valve |
| CN202220765U (en) * | 2011-08-12 | 2012-05-16 | 山东泰丰液压股份有限公司 | Cartridge valve with valve core position detection and stroke limitation functions |
| CN202834350U (en) * | 2012-09-18 | 2013-03-27 | 哈尔滨电机厂有限责任公司 | Position indication device for movable sealing ring of water inlet valve in hydropower station |
| CN107940084A (en) * | 2016-10-12 | 2018-04-20 | 中核苏阀科技实业股份有限公司 | A Non-contact Valve Position Indicating Mechanism |
| CN209084141U (en) * | 2018-10-26 | 2019-07-09 | 四川日机密封件股份有限公司 | A kind of nuclear energy safety relief valve and position indicator device |
Non-Patent Citations (1)
| Title |
|---|
| 李楚、郑宏才等: "位移、长度、角度及速度传感器", 31 December 1986, 湖北科学技术出版社, pages: 15 - 20 * |
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Application publication date: 20200505 |
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