TWI745102B - Dark-stem valve with valve position indication function and its valve position indicator - Google Patents

Abstract

A dark-stem valve with a valve position indication function and a valve position indicator thereof. The dark-stem valve has a valve body, an opening and closing part, a valve stem assembly, a rotary handwheel and a valve position indicator. The valve position indicator further includes a rod that can be assembled at the end of the valve stem assembly, and an indicator that can be screwed on the rod; the indicator has a screw that can be screwed to the rod. A screw joint part and a counterweight part of the closing section, using the weight of the counterweight part, can maintain the hanging state when the rod body is stationary or when the valve stem assembly rotates synchronously, so that the indicator is in the rotating type When the handwheel is turned on and off, it can synchronize the lateral displacement between a closed indication position and an open indication position of the rod body, so that the viewer can easily recognize and judge the opening of the valve by the position of the indicator. Closed state.

Description

Dark-stem valve with valve position indication function and its valve position indicator

The invention relates to a valve, in particular to a dark-stem valve with a valve position indicating function and a valve position indicator thereof.

Both gate valves and globe valves are widely used valves. In simple terms, gate valves refer to a valve whose internal opening and closing member moves along the vertical or radial direction of the internal flow channel or channel axis of the valve body. During operation, it is usually By operating a rotary hand wheel in conjunction with a valve stem to actuate the opening and closing part, the medium flowing through the internal flow channel is cut off to achieve a fully open or fully closed state, usually without throttling. It can be used especially for high temperature and high pressure, and can also be used for various fluid media, but it is usually not used for conveying mud or viscous fluid. Gate valve, also known as gate valve, uses gate as an opening and closing part to open and close the control valve.

Gate valves are generally divided into two types according to the movement of the valve stem. If the gate and the valve stem move linearly together, it is called the rising stem gate valve or the lifting stem gate valve. If the stem and the gate or its nut Those that are screwed together and can drive the gate to move linearly through the rotating handwheel in situ are called dark-stem gate valves or rotating-stem gate valves. Regardless of whether the gate valve of the open-rod or concealed-stem gate valve, the closing of the gate is usually forcibly sealed by external force, so when the rotary handwheel cannot be rotated, it is in the fully open or fully closed state and position.

The shut-off valve is also called the shut-off valve or the valve. Its opening and closing parts are also driven by the valve stem, but the operating direction of the opening and closing parts is different from that of the gate valve. The gate valve to flow is different, so it has directionality.

It can be seen from the above that no matter the concealed stem type gate valve or the shut-off valve, since the rotary handwheel and the valve stem will not produce linear movement during the opening and closing operation, the total height of the gate valve or the shut-off valve when installed vertically, or when installed horizontally The total length will not change, and it has the advantage of small installation space, which is especially suitable for large-diameter valves and pipelines with limited installation.

However, since the dark-stem gate valve or the shut-off valve cannot judge whether the valve is open or closed by visual changes, it is easy to cause misunderstandings or misjudgments by management and maintenance personnel, resulting in equipment damage, loss of operation and even personal injury It is also difficult to pass the inspection of fire-fighting inspectors and fail to meet the requirements of relevant fire-fighting laws and regulations.

In order to solve the above problems, there are currently a few wireless or wired valve condition monitoring devices. However, most of the above monitoring devices are too complicated, not only because of the high cost of equipment, but also the relatively difficult operation and maintenance, which cannot be applied in some environments lacking power supply. Even if the battery can supply power, the power of the battery is usually not long-lasting, so it must be checked and replaced frequently. Once the power is lost, the monitoring function will be lost, causing hidden worries in use. In addition, wireless devices must also be deployed with wireless networks, and wired devices must also be deployed with communication lines. These cumbersome and troublesome solutions usually discourage many potential users.

The invention provides a concealed stem valve with a valve position indication function and a valve position indicator thereof. The concealed stem valve has a valve body, an opening and closing member, a valve stem assembly, a rotary hand wheel and a valve position Indicator. The valve position indicator further includes a rod that can be assembled at the end of the valve stem assembly, and an indicator that can be screwed to the rod; the indicator has a screw that can be screwed to the rod. A screw joint part and a counterweight part of the joint section, the weight of the counterweight part can be used on the rod When the body is stationary or when the valve stem assembly rotates synchronously, it can maintain the hanging state, so that when the rotary handwheel is opened and closed, the indicator can be synchronized between a closed indicator position and an open indicator position of the lever body. Displacement.

The concealed stem valve provided by the present invention has a valve position indicator installed at the end of the stem assembly, and the valve position indicator can be located at the closed or open indicator position of the stem by means of the indicator for viewing The person intuitively judges the opening and closing status of the valve, therefore, it has a good indicator function of opening and closing the valve position, which can ensure the stability, reliability and safety of the valve operation, and it also meets the specifications and requirements of relevant fire protection laws and regulations.

Due to the simple structure of the valve position indicator, the cost is low, the installation operation is quite easy, the overall volume is very light, and the installation does not take up space, and it can also be used for repeated disassembly and installation.

Since the valve position indicator is completely designed with a physical structure, it does not need to be used in conjunction with any power or communication structure, equipment or wiring. It can be widely used in various environments and has a good and wide range of applicability for installation.

Since the valve position indicator is specially designed on the outer side of the rotating handwheel, it can effectively eliminate the chance that the rotating handwheel may obstruct or block the sight of the viewer, thereby providing the best viewing The position and angle avoid the possibility of misunderstanding or misjudgment by the viewer due to the interference of the obstruction or shielding, so it conforms to the excellent human factors engineering design.

1: Valve

10: Valve body

11: Internal runner

111: interface

20: Opening and closing parts

30: Stem assembly

31: Stem

310: end

311: screw hole

312: combined segment

32: Screw parts

321: Inside screw hole

322: Outer screw hole

40: Rotating handwheel

50: Valve position indicator

51: Rod body

511: Outer end

512: inside end

513: Spiral Section

514: Stud

515: Combination hole

516: screw set

517: screw hole

52: indicator

520: Screw hole

52a: Plastic parts

52b: Metal parts

521: Spiral Part

522: Counterweight

523: Bolt

524: screw hole

525: Elastic hook

526: card slot

527: First Logo

527a: The first open logo

527b: The first closing logo

527c: Separate ID

5271: text

5272: Arrow

528: Second Identity

528a: The second open logo

528b: The second closing flag

5291: pole wall

5292: pole wall

53: buckle

Pc: Turn off the indication position

Po: Turn on the indicated position

[Figure 1] is a side plan view of the dark lever valve of the present invention.

[Figure 2] is the three-dimensional appearance of the rotary handwheel, the end of the valve stem assembly and the valve position indicator of the present invention Combination chart.

[Figure 3] is a three-dimensional exploded view of the valve position indicator of the present invention.

[Figure 4] is a top plan view of the assembly state of the valve stem assembly and the valve position indicator at the end of the valve stem assembly of the present invention, and shows that the indicator of the valve position indicator is in the closed indicating position.

[Figure 5] is a top plan view of the assembled state of the valve stem assembly and the valve position indicator at the end of the valve stem assembly of the present invention, and shows that the indicator of the valve position indicator is in the open indicating position.

[Figure 6] is a partial side sectional view of another assembly structure of the valve stem assembly and the valve position indicator of the present invention.

[Figure 7] is a partial side sectional view of another assembly structure of the valve stem assembly and the valve position indicator of the present invention.

[Figure 8] is a partial side cross-sectional view of yet another assembly structure of the valve stem assembly and the valve position indicator of the present invention.

[Figure 9] is a side cross-sectional view of the indicator of the present invention.

[Figure 10] is a side sectional view of another structure of the indicator of the present invention.

[Figure 11] is a side sectional view of another structure of the indicator of the present invention.

[Figure 12] is a side plan view of the valve position indicator of the present invention with a buckle installed.

As shown in Figure 1, the present invention provides a preferred embodiment of a dark-stem valve with a valve position indication function. The valve 1 can be a gate valve or a stop valve. In this embodiment, a gate valve is used as an implementation aspect. It mainly includes a valve body 10, an opening and closing member 20, a valve stem assembly 30, a rotary hand wheel 40 and a valve position indicator 50; among them:

The valve body 10 has an internal flow passage 11. The internal flow channel 11 of this embodiment is horizontal It is straight-through or longitudinally, and each end is formed with an interface 111, which can be respectively connected with external pipelines commonly used for conveying specific fluid medium.

The opening and closing member 20 can be installed in the valve body 10. The opening and closing member 20 of this embodiment is a common shutter.

The valve stem assembly 30 can be rotatably installed on the valve body 10 in situ to move the opening and closing member 20 to open or close the internal flow passage 11, and the valve stem assembly 30 extends horizontally, especially horizontally. extend.

The rotary hand wheel 40 can be rotated by the user to drive the valve stem assembly 30. The valve stem assembly 30 of this embodiment includes a valve stem 31 for connecting the opening and closing member 20, and a screw on the end of the valve stem 31 to lock the rotary handwheel 40 to the end of the valve stem 31 The screw member 32 at 310, as shown in FIG. 2, can be clearly seen that the end 310 of the valve stem and the screw member 32 are located at the outer end of the rotary handwheel 40. In other words, the user can The end 310 of the valve stem 31 and the screw member 32 can be seen directly from the outer end of the rotary handwheel 40. The screw member 32 in this embodiment is a common screw cap.

The valve position indicator 50, as shown in Figures 2 and 3, includes a rod 51 and an indicator 52; the rod 51 has an outer end 511 and an inner end 512, and the inner end 512 is connected to the The end 310 of the valve stem assembly 30 can rotate synchronously with the valve stem assembly 30, and a threaded section 513 with external threads is formed thereon; the indicator 52 has a threaded part 521 and a counterweight Part 522, the threaded part 521 has a threaded hole 520 for threading and threading on the outside of the threaded section 513 of the rod body 51. The weight part 522 has a predetermined weight and can be stationary or on the rod body 51. As the valve stem assembly 30 rotates, its own weight remains hung below the stem 51, so that the indicator 52 can close or open the internal flow passage 11 as the rotary handwheel 40 rotates, and Synchronizing along the rod 51 The screw section 513 is laterally displaced between a closed indicating position Pc and an open indicating position Po, as shown in FIGS. 4 and 5, to achieve the desired valve position identification effect.

It should be particularly noted that since the valve stem assembly 30 extends transversely along the horizontal direction, the stem 51 of the valve position indicator 50 is connected to the end 310 of the valve stem assembly 30. It extends horizontally and transversely. Therefore, as long as the weight portion 522 of the indicator 52 has sufficient weight, it can be ensured that the weight portion 522 can be retained after the indicator 52 is screwed to the screw section 513 of the rod body 51 In the hanging state, even when the valve stem assembly 30 rotates, it can still ensure that the screwed part 521 and the screwed section 513 of the rod body 51 rotate relative to each other. In this way, it can be ensured that the valve position indicator 50 can only Along the screw section 513, it moves laterally back and forth between the closing indication position Pc and the opening indication position Po, so as not to follow the screw section 513 to rotate together.

In this embodiment, as shown in FIGS. 3 to 5, the end wall of the end 310 of the valve stem 31 is provided with a screw hole 311; the inner end 512 of the stem 51 of the valve position indicator 50 is formed with a stud 514, It is used for screwing and locking on the screw hole 311. In order to increase the firmness of the connection, an adhesive can be further provided between the stud 514 and the screw hole 311. For example, before assembling, the stud 514 or the screw hole 311 is coated or filled with an adhesive, and then the screw is locked. The fixing action can ensure that they can be firmly adhered and fixed after being screwed together.

It is easily conceivable that the valve stem 31 and the rod body 51 can have a variety of assembly structures, and are not limited to the screw assembly structure of the screw hole 311 and the stud 514 described above. One possible assembly structure is, as shown in FIG. 6, an inner screw hole 321 and an outer screw hole 322 can be provided on the screw member 32, so that the inner screw hole 321 and the valve The ends 310 of the rod 31 are screwed and locked with each other, and the stud 514 of the inner end 512 of the rod body 51 is screwed and locked by the outer screw hole 322. To achieve a firm assembly and connection effect, and the stud 514 and the outer screw hole 322 can also be coated with an adhesive, so that they can be adhered and fixed to each other.

Another possible assembly structure is, as shown in FIG. 7, a coupling section 312 with external threads can be formed at the end 310 of the valve stem 31 to protrude from the outside of the screw member 32, and then use the rod The inner end 512 of the body 51 is formed with a coupling hole 515 that can be a screw hole, so that it can be screwed and locked on the coupling section 312 to achieve a firm assembly and connection effect, and the coupling hole 515 and the coupling section 312 are also connected Adhesives can be applied to make them adhere to each other.

Another feasible assembly structure is, as shown in FIG. 8, a screw sleeve 516 can be formed on the inner end 512 of the rod body 51, and a screw hole 517 is formed inside the screw sleeve 516 to make the screw sleeve 516 defines the screw member 32, so that the rod 51 can be directly screwed and locked at the end 310 of the valve stem 31 through the screw hole 517 of the screw sleeve 516, so that the rod 51 After being assembled and connected to the end 310 of the valve stem 31, the rotary handwheel 40 can be locked and fixed on the valve stem 31 at the same time, without the need for a separate screw 32.

In this embodiment, as shown in FIG. 9, the indicating member 52 includes a plastic member 52a and a metal member 52b that are connected to each other; the plastic member 52a is mainly used to form the screw part 521; the metal member 52b is used for In order to form at least most of the weight portion 522. As we all know, the coefficient of friction between the general plastic material and the metal material is smaller than the coefficient of friction between the general metal material. Therefore, the use of the plastic part 52a to form the screwed part 521 can ensure that the screwed part 521 and the rod made of metal material The bodies 51 have a smaller coefficient of friction between each other, so that the frictional resistance of relative rotation between each other is smaller, and the mutual rotation is more flexible and light, and it helps the weight part 522 to be designed with a lighter weight to achieve maintenance. The effect of the hanging state.

In this embodiment, the plastic part 52a and the metal part 52b are connected to each other by a screw The structure is connected to each other. For example, a bolt 523 can be formed on the plastic part 52a, and a screw hole 524 can be formed on the metal part 52b, so that the metal part 52b can be directly screwed and locked by the screw hole 524 On the bolt 523, the assembly operation is quite simple, fast and firm.

It is easily conceivable that the plastic part 52a and the metal part 52b can have various assembly or molding structures, and are not limited to the screw assembly structure of the bolt 523 and the screw hole 524. One possible assembly structure is, as shown in FIG. 10, the plastic part 52a and the metal part 52b can also be assembled and connected to each other by a snap structure. For example, two elastic hooks are formed on the plastic part 52a. 525, and two grooves 526 are formed on the metal piece 52b, so that the elastic hooks 525 can be inserted into the grooves 526 respectively, so the assembly operation is also quite simple, fast and reliable.

Another feasible molding structure is, as shown in FIG. 11, the metal part 52b can be integrally overmolded inside the plastic part 52a, so that they are covered and connected to each other, that is, similar to the common embedded nut structure, which can save Excluding the above assembly operation steps, the overall structure is more solid and firm.

It should be noted that, as shown in FIG. 12, a buckle 53, such as a common C-shaped buckle, can be assembled at the outer end 511 of the rod body 51 of this embodiment to restrict the indicator 52 from being detached from the outside. The rod body 51, therefore, can ensure that the indicator 52 is not easily detached from the rod body 51 under abnormal operation.

In this embodiment, as shown in Figures 4 and 5, the indicator 52, especially on the top wall of the screwed part 521, is marked with two first marks 527, which are used to show the position of the indicator 52, respectively. The directions of the closing instruction position Pc and the opening instruction position Po are described.

Furthermore, the first logo 527 includes a first opening logo 527a and a first closing logo 527b; the first opening logo 527a has a text 5271 or a symbol that directly or indirectly represents the meaning of opening, and is related to the text 5271 or symbols should be used relative to indicate direction The first closing mark 527b has a text 5271 or symbol that directly or indirectly represents the meaning of closing, and an arrow 5272 that is used opposite to the text 5271 or symbol to indicate a direction.

It can be easily understood that the text 5271 can be any of the Chinese characters "OPEN" or "CLOSE", or the English characters "OPEN" or "CLOSE" or words with similar meanings. This embodiment is represented by Chinese characters "on" or "off". In this way, the user can easily distinguish the direction of the closing indication position Pc and the opening indication position Po through the text 5271 and the arrow 5272. For example, the inner side of the top wall surface of the screw part 521 of the indicator 52 in this embodiment The end is marked with a Chinese character "OPEN" 5271 and an arrow 5272 pointing inward, which means that the opening indication position Po is located in the direction indicated by the arrow 5272. When the indicator 52 moves in this direction, Then the opening indication position Po can be reached.

In the same way, the outer end of the top wall surface of the screw joint 521 is also marked with a Chinese character "OFF" 5271, and an arrow 5272 pointing to the outer direction, which means that the closing indication position Pc is located in the direction indicated by the arrow 5272 When the indicating member 52 moves in this direction, the closing indicating position Pc can be reached.

In order for the user to more intuitively and clearly distinguish the closing indication position Pc and the opening indication position Po, a second mark 528 may be further provided on the rod body 51 relative to the inner end 512 and the outer end 511 thereof. The positions of the closing indication position Pc and the opening indication position Po are displayed, so as to correspond to the meaning represented by the first mark 527 of the indicator 52.

Furthermore, the second logo 528 includes a second opening logo 528a and a second closing logo 528b; the second opening logo 528a has a text or symbol that directly or indirectly represents the meaning of opening; the second closing logo 528b Has a direct or indirect meaning of closing The characters or symbols of, wherein the characters can also be the Chinese characters "OPEN" or "关", or the English characters "OPEN" or "CLOSE" or any words with similar meanings. In this embodiment, the Chinese characters " "Open" or "Close" to indicate. For example, it can be clearly seen that the rod body 51 is marked with a Chinese character "ON" at the inner end 512, and a Chinese character "OFF" is marked at the outer end 511, which indicates the indication The opening indication position Po of the element 52 is located adjacent to the inner end 512 marked with the Chinese character "ON", and the closing indication position Pc is located adjacent to the outer end 511 marked with the Chinese character "OFF".

In this embodiment, the second opening mark 528a is marked on the rod body 51 on a section of the rod wall 5291 between the screw section 513 and the stud 514; the second closing mark 528b is marked on the rod body 51 On a section of the rod wall 5292 protruding from the outer side of the screw section 513.

In order to allow the user to distinguish the first opening mark 527a and the first closing mark 527b more clearly, a separation mark 527c, such as a separation line or a separation rib, can be arranged between each other.

Therefore, in this embodiment, when the user rotates the rotary hand wheel 40 clockwise to link the valve stem assembly 30 to displace the opening and closing member 20 from the open state to the closed state, it is originally located in the screw section 513 The valve position indicator 50 at the inner opening indication position Po will also gradually move laterally to the closing indication position Pc along the threaded section 513 due to the relative rotation of the rod 51 that rotates clockwise. It can be clearly seen that the first closing mark 527b is finally positioned adjacent to the second closing mark 528b. The user can clearly distinguish and judge that the indicator 52 is currently in the closed position at a glance. Indicating the position Pc also means that the valve 1 is in a closed state, so as not to cause any doubt or misunderstanding to cause misjudgment.

Similarly, when the user turns the rotary handwheel 40 counterclockwise to link the valve stem assembly 30, so that the opening and closing member 20 is displaced from the closed state to the open state, it is originally located outside the screw section 513 The valve position indicator 50 of the side closing indicating position Pc will also gradually move laterally inwardly along the threaded section 513 to advance to the opening indicating position Po, so that the first opening mark 527a is finally positioned in the same direction as the first opening indicator 527a. The two opening marks 528a are adjacent to each other, so it can also be used to clearly distinguish and judge that the indicator 52 is currently at the opening indicator position Po, which means that the valve 1 is in the open state, without causing any doubt or Misunderstandings cause misjudgments.

It can be easily understood that after the valve position indicator 50 is installed on the valve stem assembly 30, the indicated position must be checked first. First, make sure that the opening and closing member 20 is in the open or closed state. For example, The opening and closing member 20 is operated to control or confirm that it is in the closed state, and then the indicator 52 of the valve position indicator 50 is rotated to set or confirm that it is in the closed indicator position Pc, so that the calibration procedure of the indicator position can be completed It can ensure that the valve position indicator 50 can accurately indicate that the opening and closing member 20 of the valve 1 is in an open or closed state during any subsequent opening and closing operations of the valve 1.

From the above description, it can be seen that the dark stem valve 1 with valve position indication function of the present invention has the following features and achievable effects:

First, only a valve position indicator 50 needs to be installed on the valve 1 to have a valve position indication function, and the valve position indicator has a simple structure, low cost, and easy installation and operation.

Second, the volume of the valve position indicator 50 is quite small, so it does not take up space after installation, and can be easily installed in any small space without hindering the operation of the valve. It can also be detachably installed depending on the installation occasion or environment, and it can be easily disassembled and removed when necessary, so it can be disassembled and installed repeatedly.

Third, the valve position indicator 50 is completely designed with a physical structure, and does not need to be used in conjunction with any power or communication structure, equipment or wiring, and can be widely used in various environments. Good installation suitability.

Fourth, the valve position indicator 50 simply uses the indicator 52 on the position of the rod body 51 to easily allow management and maintenance personnel or inspectors to visually identify and judge that the valve position of the valve 1 is open. Or closed state, therefore, the judgment is quite simple and clear, which can effectively avoid the misunderstanding or misjudgment of the conventional knowledge, and even can be combined with various signs, such as the first sign 527 and the second sign 528, to further strengthen the opening and closing The recognizability of the location to eliminate all possible errors.

Fifth, the valve position indicator 50 is specially designed on the outer side of the rotary handwheel 40, which can effectively eliminate any opportunity that the rotary handwheel 40 may obstruct or shield the viewer’s line of sight. The best viewing position and angle avoids the possibility of misunderstanding or misjudgment by the viewer due to the interference of the obstruction or shielding, so it is in line with the excellent human factors engineering design.

Sixth, the valve position indicator 50 can be pre-installed on the valve 1, and then installed in various working environments, or simple processing can be used, for example, using one of the above embodiments to directly tap the end of the valve stem 31 The thread forms a threaded hole 311, and the valve position indicator 50 can be easily installed and positioned on the existing applicable valve 1, without disassembling or replacing the existing installed valve, so it is suitable for any installed valve, which can reduce the installation At the cost of adoption, the existing installed valve can be easily upgraded to have the function of valve position indication, so as to ensure the stability, reliability and safety of the operation of the valve 1, and meet the requirements of relevant safety regulations such as fire inspection.

To sum up, the present invention has excellent creative practicability among similar products. At the same time, the relevant technical materials or patent documents at home and abroad have not been found to reveal the same structure first. Therefore, the present invention is indeed capable of invention. For patent requirements, Yan filed an application in accordance with the law. However, the above descriptions are only part of the feasible embodiments of the present invention. For example, the application of the specification of the present invention and the scope of the patent application are The equivalent structure change should be included in the scope of the patent of the present invention.

1: Valve

10: Valve body

11: Internal runner

111: interface

20: Opening and closing parts

30: Stem assembly

31: Stem

32: Screw parts

40: Rotating handwheel

50: Valve position indicator

51: Rod body

52: indicator

521: Spiral Part

522: Counterweight

Claims (33)

A dark-stem valve with valve position indication function, including: A valve body with an internal flow channel; An opening and closing part can be installed in the valve body; A valve stem assembly can be installed on the valve body rotatably in situ, so as to move the opening and closing member to open or close the internal flow passage, and the valve stem assembly extends laterally; A rotary hand wheel, which can be turned by the user to drive the valve stem assembly; A valve position indicator includes a rod body and an indicator; the rod body has an outer end and an inner end, the inner end is connected to the end of the valve stem assembly, and can be synchronized with the valve stem assembly Rotates, and a threaded section is formed thereon; the indicator has a threaded part and a counterweight part, the threaded part can be threaded through a sleeve to be screwed on the outside of the threaded part of the rod, and the counterweight part has Predetermined weight, when the rod body is stationary or when the valve stem assembly rotates, it can hang under the rod body by its own weight, so that the indicator piece can close or open the inner part with the rotation of the rotary handwheel. The flow channel synchronously moves laterally along the screw section of the rod body between a closed indicating position and an open indicating position. The concealed stem valve with valve position indication function according to claim 1, wherein the valve stem assembly includes a valve stem for connecting the opening and closing member, and a screw on the end of the valve stem for fixing The rotary hand wheel is locked to the screw at the end of the valve stem. The concealed stem valve with valve position indication function as described in claim 2, wherein a screw hole is provided at the end of the valve stem; a stud is formed at the inner end of the stem of the valve position indicator for screwing and locking In the screw hole. According to claim 3, the concealed stem valve with valve position indication function, wherein an adhesive is further provided between the stud and the screw hole to make them adhere to each other. The concealed stem valve with valve position indication function according to claim 2, wherein the screw member has an inner screw hole and an outer screw hole, and the inner screw hole is used to screw and lock the end of the valve stem At; the inner end of the rod body of the valve position indicator is formed with a stud for screwing and fixing in the outer screw hole. According to claim 5, the concealed stem valve with valve position indication function, wherein an adhesive is further provided between the stud and the outer screw hole to make them adhere to each other. The concealed stem valve with valve position indication function according to claim 2, wherein a coupling section is formed at the end of the valve stem to protrude from the outer side of the screw member; the inner end of the stem body of the valve position indicator A coupling hole is formed, which can be screwed and locked to the coupling section. According to claim 7 of the concealed stem valve with a valve position indication function, an adhesive is further provided between the coupling section and the coupling hole to adhere to each other and fix each other. The concealed stem valve with valve position indication function according to claim 2, wherein a screw sleeve is formed at the inner end of the rod body, and a screw hole is formed inside the screw sleeve, so that the screw sleeve can be defined.述Threaded pieces. The concealed stem valve with valve position indication function according to claim 1, wherein a buckle is assembled at the outer end of the stem body to restrict the indicator piece from being detached from the stem body from the outside. The concealed stem valve with valve position indication function according to claim 1, wherein the indicating member includes a plastic part and a metal part connected to each other; the plastic part is mainly used to form the screwed part; the metal part Used to form at least most of the weight portion. The concealed stem valve with valve position indication function according to claim 11, wherein the plastic part and the metal part are connected to each other by a screw structure. The concealed stem valve with valve position indication function according to claim 11, wherein the plastic part and the metal part are connected to each other by a buckle structure. The concealed stem valve with valve position indication function according to claim 11, wherein the metal part is integrally covered inside the plastic part so as to be connected to each other. The concealed stem valve with valve position indication function as described in claim 1, wherein the indicator is marked with two first marks, which are used to respectively show the position of the closed indicator and the open indicator of the indicator direction. The concealed stem valve with valve position indication function according to claim 15, wherein the first identifier includes a first open identifier and a first closed identifier; the first open identifier has a meaning of directly or indirectly representing opening The first closing mark has a word or symbol that directly or indirectly represents the meaning of closing, and it is used opposite to the said word or symbol to indicate the direction. Arrow. The concealed stem valve with valve position indication function as described in claim 16, wherein the text is the Chinese character "OPEN" or "CLOSE", or the English character "OPEN" or "CLOSE" or any text with similar meaning By. The concealed stem valve with valve position indication function according to claim 15, wherein the rod body is marked with a second mark at the inner end and outer end relative to the inner end and the outer end, which can display the closed indication position and the open indication position The location of and is used to correspond to the meaning represented by the first identifier of the indicator. The concealed stem valve with valve position indication function according to claim 18, wherein the second identification includes a second opening identification and a second closing identification; the second opening identification The identification has a word or symbol that directly or indirectly represents the meaning of opening; the second closing mark has a word or symbol that directly or indirectly represents the meaning of closing. The concealed stem valve with valve position indication function as described in claim 19, wherein the text is the Chinese character "OPEN" or "CLOSE", or the English character "OPEN" or "CLOSE" or any text with similar meaning By. The concealed stem valve with valve position indication function according to claim 16, wherein the stem body is marked with a second mark at the inner end and outer end relative to the inner end and the outer end, which can display the closed indication position and the open indication position The location of and is used to correspond to the meaning represented by the first identifier of the indicator. The concealed stem valve with valve position indication function according to claim 21, wherein the second identification includes a second opening identification and a second closing identification; the second opening identification has a meaning of directly or indirectly representing opening The second closing logo has a text or symbol that directly or indirectly represents the meaning of closing; when the first opening logo is positioned adjacent to the second opening logo, it means that the indicator is in the opening Indicating position; when the first closing indicator is positioned adjacent to the second closing indicator, it represents that the indicator is in the closing indicator position. The concealed stem valve with valve position indication function as described in claim 22, wherein the text is the Chinese character "OPEN" or "CLOSE", or the English character "OPEN" or "CLOSE" or any text with similar meaning By. The concealed stem valve with valve position indication function as described in claim 1, wherein the valve is either a gate valve or a shut-off valve. A valve position indicator suitable for concealed stem valves, including: A rod body having an outer end and an inner end, the inner end is connected to the end of a valve stem assembly of the valve, can be rotated synchronously with the valve stem assembly, and a threaded section is formed thereon; an indicator The part has a screwed part and a counterweight part. The screwed part can be threaded and screwed on the outside of the screwed section of the rod. The counterweight has a predetermined weight and can be stationary or following the rod. When the valve stem assembly rotates, it keeps hanging below the rod body by its own weight, so that the indicator piece can be synchronized along the screw section of the rod body when the rod body rotates in a closed indicating position and A lateral displacement between the two opening indication positions. According to claim 25, a valve position indicator suitable for a concealed stem type valve, wherein a buckle is assembled at the outer end of the rod body to restrict the indicator member from detaching from the rod body from the outside. The valve position indicator suitable for a dark-stem valve according to claim 25, wherein the indicator includes a plastic part and a metal part connected to each other; the plastic part is mainly used to form the screwed part; the metal The piece is used to form at least most of the weight portion. As described in claim 25, the valve position indicator suitable for the dark-stem valve, wherein the indicator is marked with two first marks, which are respectively used to display the closed indication position and the open indication position of the indicator The direction. According to claim 28, the valve position indicator suitable for the dark-stem valve, wherein the first identifier includes a first opening identifier and a first closing identifier; the first opening identifier has a direct or indirect indication of opening The meaning of the word or symbol, and the arrow used to indicate the direction relative to the said word or symbol; the first closing mark has a word or symbol that directly or indirectly represents the meaning of closing, and it is used relative to the said word or symbol to indicate Direction arrow. The valve position indicator applicable to dark-stem valves as described in claim 29, where the text is the Chinese character "OPEN" or "CLOSE", or the English character "OPEN" or "CLOSE" or any text with similar meaning. One. The valve position indicator suitable for a dark lever valve as described in claim 29, wherein the lever body is marked with a second mark relative to the inner end and outer end, which can display the closed indication position and the open indication The location of the location is used to correspond to the meaning represented by the first identifier of the indicator. According to claim 31, the valve position indicator suitable for the dark-stem valve, wherein the second identifier includes a second open identifier and a second closed identifier; the second open identifier has a direct or indirect indication of opening Meaningful text or symbol; the second closing logo has a text or symbol that directly or indirectly represents the meaning of closing; when the first opening logo is positioned adjacent to the second opening logo, it means that the indicator is in the opening Indicating position; when the first closing indicator is positioned adjacent to the second closing indicator, it represents that the indicator is in the closing indicator position. The valve position indicator applicable to the concealed lever valve as described in claim 32, where the text is the Chinese character "OPEN" or "CLOSE", or the English character "OPEN" or "CLOSE" or any text with similar meaning. One.

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