Electric stop valve

Abstract

The utility model provides an electric stop valve which comprises a valve seat, a valve core and a valve rod, the valve core is arranged in a cavity of the valve seat, one end of the valve rod penetrates through the valve core, the upper end face of the valve core is lower than the upper end face of the valve seat, and a valve core limiting structure used for limiting the valve core is arranged in the cavity of the valve seat above the valve core. The electric stop valve is further provided with an O-shaped ring oil supplementing structure. The electric stop valve is based on the application environment of the electric stop valve, and compared with a conventional stop valve, the electric stop valve has strong superiority in the aspects of service life and use convenience.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and particularly relates to an electric globe valve. Background Art

[0002] An electric globe valve includes a valve core, a valve stem and a valve seat. The valve core and the valve seat are locked by threads to control the valve core. In order to ensure the sealing performance of the electric globe valve, an O-ring is provided between the valve core and the valve seat, and an O-ring is provided between the valve stem and the valve core. On the one hand, during use, the thread locking is likely to become loose during the rotation of the valve core, affecting the sealing performance. On the other hand, the O-ring between the valve core and the valve seat fits and abuts against the O-ring groove on the valve core. During actual use, the valve core moves frequently, and the friction between the O-ring and the O-ring groove easily causes the evaporation of the grease on the O-ring, reducing the service life of the O-ring; it is likely to affect the service life and reliability of the globe valve. Summary of the Utility Model

[0003] In view of the above problems, the utility model provides an electric globe valve.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] An electric globe valve includes a valve seat, a valve core and a valve stem. The valve core is placed inside the cavity of the valve seat. One end of the valve stem penetrates through the valve core. The upper end surface of the valve core is lower than the upper end surface of the valve seat. A valve core limiting structure is provided in the cavity of the valve seat above the valve core.

[0006] With such a setting, on the one hand, when the valve core is pushed back to the valve core limiting structure, the valve core limiting structure blocks the valve core to prevent the valve core from continuing to be pushed back. On the other hand, the valve core limiting structure also has a certain protective effect. Specifically, once the thread seal of the valve core fails, without the valve core limiting structure, the valve core will fly out directly. The setting of the valve core limiting structure can block the valve core and avoid the safety hazard caused by the direct flying out of the valve core.

[0007] Further, the distance L between the lower end surface of the valve core limiting structure and the upper end surface of the valve core is the allowable upper tolerance of the valve core, and the allowable upper tolerance refers to the maximum distance that the valve core can be pushed back upward.

[0008] With such a setting, setting the distance between the lower end surface of the valve core limiting structure and the upper end surface of the valve core as the allowable upper tolerance of the valve core can not only effectively limit the valve core, but also maximize the space for the valve core limiting structure to play its role.

[0009] Further, the valve core limiting structure is a snap ring. A snap ring groove is formed in the circumferential direction of the inner cavity side wall of the valve seat. The outer peripheral side of the snap ring is clamped in the snap ring groove and abuts against the snap ring groove, and the inner peripheral side of the snap ring is located outside the snap ring groove.

[0010] With such a setting, the valve core limiting structure in the form of a snap ring in this embodiment has a simple structure and can realize the full circumferential limitation of the valve core at the same time.

[0011] Further, the depth of the snap ring groove is not less than 1 / 2 of the ring body diameter of the snap ring and not greater than 4 / 5 of the ring body diameter of the snap ring, and the height of the snap ring groove is not greater than the ring body diameter of the snap ring.

[0012] With such a setting, setting the depth of the snap ring groove to be not less than 1 / 2 of the ring body diameter of the snap ring and not greater than 4 / 5 of the ring body diameter of the snap ring can not only ensure its connection stability with the valve seat but also ensure its effective blocking of the valve core. Setting the height of the snap ring groove to be the same as the ring body diameter of the snap ring can not only ensure the shape of the snap ring remains unchanged but also ensure its connection stability with the valve seat.

[0013] Further, the electric globe valve is also provided with an O-ring oil replenishing structure.

[0014] Further, a first O-ring is arranged between the valve core and the inner side wall of the valve seat. First O-ring grooves are oppositely arranged on the outer side wall of the valve core and the inner side wall of the valve seat. The first O-ring is fixed in the cavity surrounded by the first O-ring grooves on the outer side wall of the valve core and the inner side wall of the valve seat. The oil replenishing structure is a first oil storage groove arranged on the outer side wall of the valve core or the inner side wall of the valve seat within a certain diameter range on the outer peripheral side of the first O-ring.

[0015] With such a setting, by arranging the first oil storage groove on the valve core or the valve seat within a certain range from the first O-ring, when the lubricating grease attached to the first O-ring itself evaporates due to frequent movement, the lubricating grease in the first oil storage groove can be replenished in time, and the first O-ring can have a longer service life compared with the conventional structure.

[0016] Further, the first oil storage groove is located on the upper and lower side walls of the first O-ring groove on the outer side wall of the valve core; the first oil storage groove is a U-shaped groove with an opening facing the first O-ring groove.

[0017] With such a setting, by designing the first oil storage groove on the upper and lower side walls of the first O-ring groove on the outer side wall of the valve core, the lubricating grease can be more fully and timely replenished to the first O-ring.

[0018] Further, two second O-rings are provided at intervals in the direction of the valve stem axis. Second O-ring grooves are oppositely formed on the circumferential side wall of the valve stem and the inner side wall of the valve core. The second O-rings are respectively placed in one second O-ring groove, and at least one oil replenishing structure is provided between the two second O-rings.

[0019] Further, the oil replenishing structure is a second oil storage groove formed on the outer side wall of the valve stem between the two second O-rings.

[0020] With such a setting, during the working process of the valve stem, the grease in the second oil storage groove will continuously replenish the surface of the second O-ring to reduce the friction between the second O-ring and the outer wall, thereby increasing its service life and preventing wear between the second O-ring and the upper and lower retaining rings due to the loss of grease on the surface of the second O-ring.

[0021] Further, in this embodiment, a coating is added to the outer side wall of the valve stem.

[0022] With such a setting, the coating can further improve the surface finish of the core rod and reduce friction, so as to increase the service life of the total rod.

[0023] The electric globe valve of the present utility model has strong superiority in terms of service life and use convenience compared with the conventional globe valve based on the environment in which the electric globe valve is applied. On the one hand, the safety performance is ensured by adding a snap ring structure, and the upper limit of the opening of the valve core is reminded by the snap ring limit, enhancing the human-machine interaction; on the other hand, oil storage grooves are added to the upper and lower end faces of the O-ring groove of the valve core, the valve stem uses a double-O soft seal structure, and an independent oil storage groove is added to keep the O-ring fully lubricated, so that it still has a higher service life compared with the conventional structure even under extreme working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the electric globe valve described in Embodiment 1 of the present utility model.

[0025] Figure 2 It is a schematic structural diagram of the electric globe valve described in Embodiment 2 of the present utility model.

[0026] Figure 3 For Figure 2 The enlarged schematic diagram of Part A in

[0027] Figure 4 For Figure 2 The enlarged schematic diagram of Part B in

[0028] Figure 5 It is a schematic structural diagram of the electric globe valve described in Embodiment 3 of the present utility model.

[0029] Figure 6Schematic structural diagram of the valve stem described in Embodiment 4 of the present utility model.

[0030] Figure 7 Schematic structural diagram of the electric globe valve described in Embodiment 5.

[0031] Figure 8 Schematic of the electric globe valve described in Embodiment 6 Figure 1 。

[0032] Figure 9 Schematic of the electric globe valve described in Embodiment 6 Figure 2 。

[0033] Figure 10 Longitudinal sectional view of the first O-ring seal described in Embodiment 7.

[0034] Figure 11 Longitudinal sectional view of the special-shaped seal ring described in Embodiment 8.

[0035] Wherein, 1-valve seat, 2-valve core, 3-valve stem, 4-retaining ring, 5-first O-ring, 6-first O-ring groove, 7-second O-ring, 8-second O-ring groove, 9-second oil storage groove, 10-special-shaped seal ring, 11-retaining ring groove, 21-first oil storage groove, 71-lubricating oil storage cavity, 72-oil outlet hole, 73-oil injection hole, 74-sealing cover. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present utility model and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model. Embodiment

[0037] As Figure 1 shown, an electric globe valve includes a valve seat 1, a valve core 2 and a valve stem 3. The valve core 2 is placed inside the cavity of the valve seat 1. One end of the valve stem 3 penetrates through the valve core 2. The upper end surface of the valve core 2 is lower than the upper end surface of the valve seat 1. It is characterized in that a valve core limiting structure for restricting the upward movement of the valve core 2 is provided in the cavity of the valve seat 1 above the valve core 2.

[0038] It can be understood that, on the one hand, when the valve core 2 is pushed backward to the valve core limiting structure, the valve core limiting structure limits and blocks the valve core 2 to prevent the valve core 2 from continuing to be pushed backward towards the outlet of the valve seat 1; on the other hand, the valve core limiting structure also has a certain protective effect. Specifically, once the thread seal of the valve core 2 fails, in the absence of the valve core limiting structure, the valve core 2 will fly out directly. The setting of the valve core limiting structure can block the valve core 2 to avoid the safety hazards caused by the direct flight of the valve core 2.

[0039] In this embodiment, the distance L between the lower end surface of the valve core limiting structure and the upper end surface of the valve core 2 is the allowable upper tolerance of the valve core 2, and the allowable upper tolerance refers to the maximum distance that the valve core 2 can be pushed upward. Of course, in other embodiments, the distance between the lower end surface of the valve core limiting structure and the upper end surface of the valve core 2 can also be less than the allowable upper tolerance of the valve core 2.

[0040] The value of the allowable upper tolerance L is related to the thread stroke of the valve core 2. When the simulated stroke of the valve core 2 moving upward exceeds the thread stroke of the valve core 2, the valve core thread will disengage from the bite. In actual application, the allowable upper tolerance L needs to be determined according to the specifications of the applicable valve core, and then the position of the valve core limiting structure is determined.

[0041] In this embodiment, the thread stroke of the valve core is 4 ± 0.3 mm, that is, the value of the allowable upper tolerance L is 4 ± 0.3 mm.

[0042] It can be understood that when the distance between the lower end surface of the valve core limiting structure and the upper end surface of the valve core 2 is too large, the valve core limiting structure cannot limit the valve core 2 in a timely and effective manner, and the valve core 2 is prone to shaking up and down, unable to completely avoid safety hazards, and affecting the service life of the electric globe valve; setting the distance between the lower end surface of the valve core limiting structure and the upper end surface of the valve core 2 as the allowable upper tolerance of the valve core 2 can not only effectively limit the valve core 2, but also maximize the space for the valve core limiting structure to play its role.

[0043] In this embodiment, the valve core limiting structure is a snap ring 4. A snap ring groove 11 is provided on the circumferential side of the inner cavity side wall of the valve seat 1. The outer peripheral side of the snap ring 4 is clamped in the snap ring groove 11 and forms an abutment with the snap ring groove 11, and the inner peripheral side of the snap ring 4 is located outside the snap ring groove 11.

[0044] It can be understood that the outer peripheral side of the snap ring 4 is located within the snap ring groove 11, realizing the fixed connection between the snap ring 4 and the valve seat 1. The inner peripheral side of the snap ring 4 extends out of the snap ring groove 11. When the valve core 2 moves upward to abut against the lower end surface of the snap ring 4, the upward movement of the valve core 2 can be blocked, realizing the limit of the valve core 2. In this embodiment, the snap ring 4 is used to limit the valve core 2. The structure of the snap ring 4 is simple. The annular design of the snap ring 4 can provide an upward blocking force in the whole circumference, and can realize the full circumferential limit of the valve core 2.

[0045] Of course, in other embodiments, the valve core limiting structure can also be in other forms. For example, a plurality of limiting blocks circumferentially spaced along the inner cavity side wall of the valve seat 1, etc.

[0046] Furthermore, the depth of the snap ring groove 11 is not less than 1 / 2 of the ring body diameter of the snap ring 4 and not greater than 4 / 5 of the ring body diameter of the snap ring 4, and the height of the snap ring groove 11 is not greater than the ring body diameter of the snap ring 4. Specifically, in this embodiment, the depth of the snap ring groove 11 is 1 / 2 of the ring body diameter of the snap ring 4, and the height of the snap ring groove 11 is the same as the ring body diameter of the snap ring 4. Of course, in other embodiments, the depth of the snap ring groove 11 can also be 2 / 3 or 3 / 5 or 4 / 5 of the ring body diameter of the snap ring 4, and the height of the snap ring groove 11 can also be slightly less than the ring body diameter of the snap ring 4.

[0047] It can be understood that if the depth of the snap ring groove 11 is too large, the part of the snap ring 4 protruding from the card slot is too small to effectively limit the valve core 2. When the depth of the snap ring groove 11 is too small, the connection between the snap ring 4 and the valve seat 1 is not stable, and there is a risk of detaching from the valve seat 1 under the impact of the valve core 2. Setting the depth of the snap ring groove 11 to be not less than 1 / 2 of the ring body diameter of the snap ring 4 and not greater than 4 / 5 of the ring body diameter of the snap ring 4 can ensure its connection stability with the valve seat 1 while ensuring its effective blocking of the valve core 2. Similarly, if the height of the snap ring groove 11 is too large, it will affect the connection stability between the snap ring 4 and the valve seat 1. If it is too small, the outer shape of the snap ring 4 will be deformed by extrusion, and there is a potential safety hazard of not being able to effectively block the valve core 2. Setting the height of the snap ring groove 11 to be the same as the ring body diameter of the snap ring 4 can ensure that the outer shape of the snap ring 4 remains unchanged while ensuring its connection stability with the valve seat 1. Embodiment

[0048] Based on the above-mentioned Embodiment 1, the electric globe valve is further provided with an O-ring oil replenishing structure.

[0049] Such as Figure 1As shown, a first O-ring 5 is provided between the inner side wall of the valve core 2 and the valve seat 1. Opposite first O-ring grooves 6 are provided on the outer side wall of the valve core 2 and the inner side wall of the valve seat 1. The first O-ring 5 is fixed in the cavity formed by the first O-ring grooves 6 on the outer side wall of the valve core 2 and the inner side wall of the valve seat 1. The oil replenishing structure is a first oil storage groove 21 provided on the outer side wall of the valve core 2 or the inner side wall of the valve seat 1 within a certain diameter range on the outer peripheral side of the first O-ring 5.

[0050] Specifically, as Figures 2 - 4 shown, in this embodiment, the oil replenishing structure is the first oil storage groove 21 opened on the upper and lower side walls of the first O-ring groove 6 on the outer side wall of the valve core 2; the first oil storage groove 21 is a U-shaped groove with an opening facing the first O-ring groove 6.

[0051] Of course, in other embodiments, the oil replenishing structure can be the first oil storage groove 21 provided only on the upper side wall or the lower side wall of the first O-ring groove 6 on the outer side wall of the valve core 2, or the first oil storage groove 21 provided in the first O-ring groove 6 on the inner side wall of the valve seat 1; it can also be other forms of oil replenishing structures.

[0052] It can be understood that by designing the first oil storage grooves 21 on the upper and lower side walls of the first O-ring groove 6 on the outer side wall of the valve core 2, when the lubricating grease attached to the first O-ring 5 itself evaporates due to frequent movement, the lubricating grease in the first oil storage grooves 21 can be replenished in time, and the first O-ring 5 can have a longer service life compared with the conventional structure.

[0053] Furthermore, in this embodiment, a coating is added to the outer side wall of the valve stem 3.

[0054] It can be understood that the setting of the coating can further improve the surface finish of the valve stem 3 and reduce the friction force to improve the service life of the total rod. Embodiment

[0055] Except that the setting position of the first oil storage groove 21 in this embodiment is different from that in Embodiment 2, others are the same as those in Embodiment 2.

[0056] Such as Figure 5 shown, in this embodiment, the first oil storage groove 21 is provided on the outer side wall of the valve core 2 above the first O-ring groove 6, and the specific position can be determined according to the situation.

[0057] Of course, in other embodiments, the first oil storage groove 21 can also be provided on the outer side wall of the valve core 2 above and below the first O-ring 5 or on the inner side wall of the valve seat 1 above and below the first O-ring 5, or on the side wall of the first O-ring groove on the valve seat 1, and the specific position is not limited here. Embodiment

[0058] As Figure 1 and Figure 6 shown, on the basis of Embodiment 3, two second O-rings 7 are provided at intervals in the axial direction of the valve stem 3 axis. Second O-ring grooves 8 are oppositely formed on the circumferential side wall of the valve stem 3 and the inner side wall of the valve core 2. The second O-rings 7 are respectively placed in one second O-ring groove 8, and at least one oil replenishing structure is provided between the two second O-rings 7.

[0059] In this embodiment, the oil replenishing structure is a second oil storage groove 9 formed on the outer side wall of the valve stem 3 located between the two second O-rings 7.

[0060] It can be understood that a soft-sealed double O structure is used on the valve stem 3. Since the valve stem 3 rotates more times during actual use, at least one second oil storage groove 9 is added between the two second O-rings 7. When assembling, grease is injected into the second oil storage groove 9. The second oil storage groove 9 of the valve stem 3 can store more grease. During the working process of the valve stem 3, the grease in the second oil storage groove 9 will continuously supplement to the surface of the second O-ring 7 to reduce the friction between the second O-ring 7 and the outer wall, thereby improving its service life and preventing wear between the second O-ring 7 and the upper and lower retaining rings due to the loss of grease on the surface of the second O-ring.

[0061] Further, in this embodiment, a coating is added to the outer side wall of the valve stem 3.

[0062] It can be understood that the setting of the coating can further improve the surface finish of the core rod and reduce the friction force, so as to improve the service life of the total rod. Embodiment

[0063] This embodiment is the same as Embodiment 4 except for the setting method of the oil replenishing structure. As Figure 7 shown, the oil replenishing structure is at least one second oil storage groove 9 respectively provided on the outer side wall of the valve stem 3 located outside the two second O-rings 7. In this embodiment, the number of the second oil storage grooves 9 on both sides of the two second O-rings 7 is 1. Of course, in other embodiments, the number of the second oil storage grooves 9 on each side can be the same or different, and the number can be 1 or 2, etc.

[0064] It is understandable that at least one additional second grease storage groove 9 is added outside each of the two second O-rings 7. During assembly, grease is injected into the second grease storage groove 9. The second grease storage groove 9 of the valve stem 3 can store more grease. During the operation of the valve stem 3, the grease in the second grease storage groove 9 will continuously supplement the surface of the second O-ring 7 to reduce the friction between the second O-ring 7 and the outer wall, thereby increasing its service life and preventing wear between the second O-ring 7 and the upper and lower retaining rings due to the loss of grease on the surface of the second O-ring. Embodiment

[0065] In this embodiment, except for the setting method of the oil replenishing structure being different from that of Embodiment 4, others are the same as those in Embodiment 4. In this embodiment, the second grease storage groove 9 is arranged on the side wall where the valve core 2 contacts the valve stem 3, as Figure 8 shown. The position of the second grease storage groove 9 on the valve stem 3 can be between the two second O-rings 7, as Figure 9 shown. The second grease storage groove 9 can also be outside the two second O-rings 7. Or, it can be arranged both between and outside the two second O-rings 7. It is understandable that the second grease storage groove 9 is arranged on the side wall where the valve core 2 contacts the valve stem 3. During assembly, grease is injected into the second grease storage groove 9. The second grease storage groove 9 of the valve stem 3 can store more grease. During the operation of the valve stem 3, the grease in the second grease storage groove 9 will continuously supplement the surface of the second O-ring 7 to reduce the friction between the second O-ring 7 and the outer wall, thereby increasing its service life and preventing wear between the second O-ring 7 and the upper and lower retaining rings due to the loss of grease on the surface of the second O-ring. Embodiment

[0066] In this embodiment, except for the structural form of the oil replenishing structure being different from that of Embodiment 4, others are the same as those in Embodiment 4. As Figure 10 shown, in this embodiment, the oil replenishing structure is a lubricating oil storage cavity 71 arranged inside the second O-ring 7. A plurality of oil outlet holes 72 communicating with the lubricating oil storage cavity 71 and an oil injection hole 73 are evenly distributed on the circumferential side wall of the second O-ring 7. A sealing cover 74 is provided in the oil injection hole 73, and the diameter of the oil outlet hole 72 is less than 1 mm.

[0067] It is understandable that the valve stem 3 rotates many times during actual use. During the rotation of the valve stem 3, the lubricating oil in the lubricating oil storage cavity 71 flows out from the oil outlet holes 72 and continuously supplements the surface of the second O-ring 7. Embodiment

[0068] In this embodiment, except for the structural form of the sealing ring and the structural form of the oil replenishing structure being different from those of Embodiment 4, others are the same as those in Embodiment 4. As Figure 11As shown, in this embodiment, the sealing ring is a special-shaped sealing ring 10. The circumferential surface of the sealing ring is W-shaped. The annular channel formed by the groove on the circumferential side surface of the special-shaped sealing ring 10 and the side wall of the sealing ring groove on the valve stem 3 and the valve core 2 is the oil replenishing structure.

[0069] Those of ordinary skill in the art should understand that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electric globe valve, comprising a valve seat (1), a valve core (2) and a valve stem (3), wherein the valve core (2) is placed inside the cavity of the valve seat (1), one end of the valve stem (3) penetrates through the valve core (2), and the upper end face of the valve core (2) is lower than the upper end face of the valve seat (1), characterized in that, A valve core limiting structure is provided in the cavity of the valve seat (1) above the valve core (2).

2. The electric stop valve according to claim 1, characterized in that, The distance L between the lower end surface of the valve core limiting structure and the upper end surface of the valve core (2) is the allowable upper tolerance of the valve core (2), and the allowable upper tolerance refers to the maximum distance that the valve core (2) can be pushed upward reversely.

3. The electric stop valve according to claim 2, characterized in that, The valve core limiting structure is a snap ring (4). On the circumferential direction of the inner cavity side wall of the valve seat (1), a snap ring groove (11) formed by inward depression is provided. The outer peripheral side of the snap ring (4) is clamped in the snap ring groove (11) and forms an abutment with the snap ring groove (11), and the inner peripheral side of the snap ring (4) is located outside the snap ring groove (11).

4. The electric globe valve according to claim 3, wherein, The depth of the snap ring groove (11) is not less than 1 / 2 of the ring body diameter of the snap ring (4) and not greater than 4 / 5 of the ring body diameter of the snap ring (4), and the height of the snap ring groove (11) is not greater than the ring body diameter of the snap ring (4).

5. The electric stop valve according to any one of claims 1 to 4, characterized in that, The electric stop valve is further provided with an O-ring oil replenishing structure.

6. The electric stop valve according to claim 5, characterized in that, A first O-ring (5) is provided between the inner side wall of the valve core (2) and the valve seat (1). On the outer side wall of the valve core (2) and the inner side wall of the valve seat (1), first O-ring grooves (6) are relatively provided. The first O-ring (5) is arranged in the cavity surrounded by the first O-ring grooves (6) on the outer side wall of the valve core (2) and the inner side wall of the valve seat (1). The oil replenishing structure is a first oil storage groove (21) provided on the outer side wall of the valve core (2) or the inner side wall of the valve seat (1) within a certain diameter outer peripheral side range of the first O-ring (5).

7. The electric stop valve according to claim 6, characterized in that, The first oil storage groove (21) is located on the upper and lower side walls of the first O-ring groove (6) on the outer side wall of the valve core (2); the first oil storage groove (21) is a U-shaped groove with an opening facing the first O-ring groove (6).

8. The electric shut-off valve according to claim 6 or 7, characterized in that, Two second O-rings (7) are provided at intervals in the axial direction of the valve stem (3). On the circumferential side wall of the valve stem (3) and the inner side wall of the valve core (2), second O-ring grooves (8) are relatively provided. The second O-rings (7) are respectively placed in one second O-ring groove (8), and at least one oil replenishing structure is provided between the two second O-rings (7).

9. The electric stop valve according to claim 8, wherein, The oil replenishing structure is a second oil storage groove (9) provided on the outer side wall of the valve stem (3) between the two second O-rings (7).

10. The electric stop valve according to claim 9, characterized in that, A plating layer is added to the outer side wall of the valve stem (3).

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