Grease injection valve

Abstract

The utility model relates to a grease injection valve, and relates to the technical field of valves. The grease injection valve comprises a valve body, a valve element, a plug, an elastic piece and a first sealing piece. A grease injection channel penetrating through the valve body in the axial direction is arranged in the valve body, a plurality of grease outlet channels are arranged on the outer wall of the valve body, and the grease outlet channels are arranged around the grease injection channel in the circumferential direction at intervals and communicate with the grease injection channel. The valve element is movably arranged in the grease injection channel, and the valve element is provided with a first step surface; the plug is in threaded connection with one end, far away from the grease outlet channel, of the grease injection channel; the elastic piece is located below the valve element. The first sealing piece is arranged on the first step surface; and external pressure and the elastic piece can drive the valve element to move in the axial direction so as to control on-off of the grease injection valve. According to the technical scheme, the problems that an existing grease injection valve is not tight in sealing, and all assemblies are not easy to replace can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a grease injection valve. Background Art

[0002] In the process of natural gas extraction and transportation, in order to meet the requirements of production, process, safety, etc., it is necessary to perform grease injection maintenance on the valve to fill the tiny gap on the valve sealing surface and reduce the risk of natural gas leakage and valve corrosion loss. The method of injecting grease into the valve is to connect the grease injection valve with a grease injection gun, and then the grease injection gun applies pressure to the sealing grease in the gun. The sealing grease is injected into the valve cavity after passing through the grease injection valve to achieve the purpose of grease injection and sealing the valve plate.

[0003] In the actual production process, the existing grease injection valve has a poor one-way seal due to the wear of the steel ball inside the valve, the presence of foreign matter stuck on the steel ball or the cone surface, etc., resulting in leakage of sealing grease and natural gas. In addition, the existing grease injection valve is generally a non-detachable structure, and it is difficult to replace the components after they are damaged. The only option is to replace the entire grease injection valve, which increases the cost. Utility Model Content

[0004] The embodiment of the utility model provides a grease injection valve, which can solve the problems of poor sealing of the existing grease injection valve and difficulty in replacing various components.

[0005] In a first aspect, an embodiment of the utility model provides a grease injection valve, comprising:

[0006] A valve body, wherein a grease injection channel is provided in the valve body and penetrates the valve body in the axial direction, and a plurality of grease outlet channels are provided on the outer wall of the valve body, and the plurality of grease outlet channels are arranged circumferentially around the grease injection channel and communicate with the grease injection channel;

[0007] A valve core is movably disposed in the grease injection channel, and the valve core has a first step surface;

[0008] A plug, threadedly connected to an end of the grease injection channel away from the grease outlet channel;

[0009] an elastic member, located below the valve core; and

[0010] A first sealing member is disposed on the first step surface;

[0011] The external pressure and the elastic member can drive the valve core to move along the axial direction to control the on and off of the grease injection valve.

[0012] In one embodiment, in the filling state, the external pressure drives the valve core to move in a direction away from the plug and compresses the elastic member, so that the first step surface is located below the top of the grease outlet channel, so that the filled sealing grease can be discharged through the grease outlet channel; in the locking state, the external pressure and the elastic member drive the valve core to move in a direction close to the plug, so that the valve core is inserted into the plug and the first sealing member abuts against the plug.

[0013] In one embodiment, the valve core comprises:

[0014] a penetration section, which is penetrated through the plug; and

[0015] A locking section is arranged at one end of the penetration section, and a diameter of the locking section is larger than a diameter of the penetration section to form the first step surface.

[0016] In one embodiment, the plug comprises:

[0017] The first plugging section;

[0018] a second plugging section, which is disposed at one end of the first plugging section and is threadedly connected to the grease injection channel, wherein the diameter of the second plugging section is smaller than that of the first plugging section to form a plugging step surface abutting against the end surface of the valve body; and

[0019] The second sealing member is arranged between the step surface of the plug and the end surface of the valve body.

[0020] In one embodiment, the grease injection valve further comprises a valve bonnet, which is threadedly connected to an end of the valve body away from the grease outlet passage, wherein the plug is located inside the valve bonnet.

[0021] In one embodiment, a locking screw hole communicating with the plug is provided in the valve bonnet, wherein in a locked state, the valve core is threadedly connected to the locking screw hole.

[0022] In one embodiment, the grease injection valve further comprises a pressure relief cap, which is threadedly connected to one end of the valve body away from the grease outlet channel, the pressure relief cap is located outside the plug, the pressure relief cap is inserted into the grease injection channel and connected to the valve core, and a pressure relief hole is provided on the pressure relief cap;

[0023] Wherein, when in a stuck state, the pressure relief cap can drive the valve core to move to release the blockage.

[0024] In one embodiment, a release screw hole is provided at one end of the valve core away from the elastic member.

[0025] In one embodiment, the pressure relief cap comprises:

[0026] A cap head, wherein one end of the cap head away from the pressure relief hole is provided with a mounting screw hole, and the mounting screw hole is connected to the pressure relief hole; and

[0027] A push rod, one end of which extends into the mounting screw hole and is connected to the cap head;

[0028] The mounting screw hole is threadedly connected to the valve body, and one end of the push rod away from the cap head is threadedly connected to the unlocking screw hole.

[0029] In one embodiment, the grease outlet channel extends along the axial direction to an end surface of the valve body away from the plug.

[0030] Compared with the prior art, the advantages of the embodiments of the utility model are that a passage for filling sealing grease is formed by setting a grease injection channel and a grease outlet channel, and the sealing grease is discharged from the grease outlet channel into the valve chamber to be sealed, and multiple grease outlet channels make it easier for blockages and sealing grease to be discharged. The valve core is driven to move by external pressure and elastic parts. When the valve core moves to the point where the first sealing member abuts against the plug, the grease injection valve is closed, and when the first step surface of the valve core moves into the grease outlet channel, the grease injection valve is opened. Compared with the existing grease injection valves that are provided with steel balls, conical surfaces and other structures, which are prone to one-way poor sealing of the grease injection valve due to wear of the steel balls, obstruction of foreign matter on the steel balls or conical surfaces, the present application does not need to set steel balls or conical surfaces, thereby improving the sealing of the grease injection valve and extending the service life of the grease injection valve, and using the first sealing member to abut against the plug to form a soft seal, further providing a sealing effect. In addition, through the threaded connection between the valve body and the plug, the various components in the valve body can be replaced by loosening and removing the plug, which is not only convenient for disassembly and replacement of various parts, but also saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0032] Figure 1 This is a front view of a grease injection valve provided by an embodiment of the utility model;

[0033] Figure 2 yes Figure 1 Cross-sectional view along AA direction;

[0034] Figure 3 yes Figure 1 A cross-sectional view of the valve grease provided in the embodiment in the locked state;

[0035] Figure 4 yes Figure 1 A schematic diagram of the structure of a pressure relief cap provided in the embodiment;

[0036] Figure 5 yes Figure 1 A cross-sectional view of the pressure relief cap provided in the embodiment in the main viewing direction.

[0037] Reference numerals:

[0038] 10. valve body; 110. grease injection channel; 120. grease outlet channel;

[0039] 20, valve core; 210, first step surface; 220, penetration section; 230, locking section; 240, release screw hole;

[0040] 30, plug; 310, first plug section; 320, second plug section; 330, second sealing member

[0041] 40. Elastic parts;

[0042] 50. a first sealing member;

[0043] 60, valve cap; 610, locking screw hole;

[0044] 70. Pressure relief cap; 710. Cap head; 7101. Mounting screw hole; 7102. Pressure relief hole; 720. Push rod. DETAILED DESCRIPTION

[0045] The utility model will be further described below in conjunction with the accompanying drawings.

[0046] In the process of natural gas extraction and transportation, in order to meet the requirements of production, process, safety, etc., it is necessary to perform grease injection maintenance on the valve to fill the tiny gap on the valve sealing surface and reduce the risk of natural gas leakage and valve corrosion loss. The method of injecting grease into the valve is to connect the grease injection valve with a grease injection gun, and then the grease injection gun applies pressure to the sealing grease in the gun. The sealing grease is injected into the valve cavity after passing through the grease injection valve to achieve the purpose of grease injection and sealing the valve plate.

[0047] In the actual production process, the grease injection valve may not be sealed tightly in one direction due to wear of the steel ball inside the valve, or obstruction of foreign matter on the steel ball or cone surface, causing sealing grease and natural gas to leak out.

[0048] like Figure 1-Figure 3As shown, in order to solve the above-mentioned problems, at least one embodiment of the utility model provides a grease injection valve, including a valve body 10, a valve core 20, a plug 30, an elastic member 40 and a first sealing member 50; a grease injection channel 110 is provided in the valve body 10 and passes through the valve body 10 in the axial direction, and a plurality of grease outlet channels 120 are provided on the outer wall of the valve body 10, and the plurality of grease outlet channels 120 are arranged circumferentially around the grease injection channel 110 and are connected to the grease injection channel 110; the valve core 20 is movably arranged in the grease injection channel 110, and the valve core 20 has a first step surface 210; the plug 30 is threadedly connected to one end of the grease injection channel 110 away from the grease outlet channel 120; the elastic member 40 is located below the valve core 20; the first sealing member 50 is arranged on the first step surface 210; wherein, the external pressure and the elastic member 40 can drive the valve core 20 to move in the axial direction to control the on and off of the grease injection valve.

[0049] As can be seen from the above, by setting the grease injection channel 110 and the grease outlet channel 120, a passage for filling the sealing grease is formed, and the sealing grease is discharged from the grease outlet channel 120 into the valve chamber to be sealed, and multiple grease outlet channels 120 make it easier for blockages and sealing grease to be discharged. The valve core 20 is driven to move by external pressure and the elastic member 40. When the valve core 20 moves to the first sealing member 50 and the plug 30 are in contact, the grease injection valve is closed. When the first step surface 210 of the valve core 20 moves to the grease outlet channel 120, the grease injection valve is opened. Compared with the existing grease injection valves with steel balls, conical surfaces and other structures, which are easily caused by the wear of the steel balls, the presence of foreign objects on the steel balls or the conical surfaces, etc., which may cause the grease injection valve to be one-way sealed. In this application, there is no need to set steel balls and conical surfaces, thereby improving the sealing performance of the grease injection valve and extending the service life of the grease injection valve. The first sealing member 50 is in contact with the plug 30 to form a soft seal, which further provides a sealing effect. In addition, through the threaded connection between the valve body 10 and the plug 30, the various components in the valve body 10 can be replaced by loosening and removing the plug 30, which is not only convenient for disassembly, but also easy to replace various components and saves costs.

[0050] It should be noted that the elastic member 40 includes but is not limited to a spring. When the spring is not subjected to an external force and is at its original length, the upper end of the spring is located above the upper end of the grease outlet channel 120 .

[0051] It should also be noted that if Figure 2 As shown, the axial direction is parallel to the Z direction.

[0052] It should also be noted that a limiting step surface is provided in the grease injection channel 110, and one end of the spring abuts against the limiting step surface; a valve body thread is provided on the outer wall of the valve body 10; the valve core 20 is matched in shape with the grease injection channel 110 so that the valve core 20 can move in the axial direction.

[0053] It should also be noted that the number of the fat outlet channels 120 is set as needed. For example, the number of the fat outlet channels 120 is 4.

[0054] like Figure 1-Figure 3 As shown, an embodiment of the utility model provides a grease injection valve, including a valve body 10, a valve core 20, a plug 30, an elastic member 40 and a first sealing member 50; a grease injection channel 110 is provided in the valve body 10 and passes through the valve body 10 in the axial direction, and a plurality of grease outlet channels 120 are provided on the outer wall of the valve body 10, and the plurality of grease outlet channels 120 are arranged circumferentially around the grease injection channel 110 and are connected to the grease injection channel 110; the valve core 20 is movably arranged in the grease injection channel 110, and the valve core 20 has a first step surface 210; the plug 30 is threadedly connected to one end of the grease injection channel 110 away from the grease outlet channel 120; the elastic member 40 is located below the valve core 20; the first sealing member 50 is arranged on the first step surface 210; wherein, the external pressure and the elastic member 40 can drive the valve core 20 to move in the axial direction to control the on and off of the grease injection valve.

[0055] As can be seen from the above, by setting the grease injection channel 110 and the grease outlet channel 120, a passage for filling sealing grease is formed, and the sealing grease is discharged from the grease outlet channel 120 into the valve chamber to be sealed, and multiple grease outlet channels 120 make it easier for blockages and sealing grease to be discharged. The valve core 20 is driven to move by external pressure and the elastic member 40. When the valve core 20 moves to the first sealing member 50 and the plug 30 abut, the grease injection valve is closed and a sealing effect is generated. When the first step surface 210 of the valve core 20 moves to the grease outlet channel 120, the grease injection valve is opened. Compared with the existing grease injection valves with steel balls, conical surfaces and other structures, which are easily caused by the wear of the steel balls, the presence of foreign objects on the steel balls or the conical surfaces, etc., resulting in a one-way loose sealing of the grease injection valve, the present application does not need to set steel balls and conical surfaces, thereby improving the sealing of the grease injection valve and extending the service life of the grease injection valve, and using the first sealing member 50 to abut against the plug 30 to form a soft seal, further providing a sealing effect. In addition, the threaded connection between the valve body 10 and the plug 30 is not only convenient for disassembly, but also easy for replacement of various components, thus saving costs.

[0056] It should be noted that the elastic member 40 includes but is not limited to a spring. When the spring is not subjected to an external force and is at its original length, the upper end of the spring is located above the upper end of the grease outlet channel 120 .

[0057] It should also be noted that if Figure 2 As shown, the axial direction is parallel to the Z direction.

[0058] It should also be noted that a limiting step surface is provided in the grease injection channel 110, and one end of the spring abuts against the limiting step surface; a valve body thread is provided on the outer wall of the valve body 10; the valve core 20 is matched in shape with the grease injection channel 110 so that the valve core 20 can move in the axial direction.

[0059] like Figure 2 , Figure 3 As shown, in some embodiments, in the filling state, the external pressure drives the valve core 20 to move in the direction away from the plug 30 and compresses the elastic member 40, so that the first step surface 210 is located below the top of the grease outlet channel 120, so that the filled sealing grease can be discharged through the grease outlet channel 120; in the locked state, the external pressure and the elastic member 40 drive the valve core 20 to move in the direction close to the plug 30, so that the valve core 20 is inserted into the plug 30, and the first sealing member 50 is in contact with the plug 30.

[0060] It should be noted that the filling state refers to opening the grease injection valve and injecting sealing grease into the valve chamber to be sealed through the grease injection valve; the locking state refers to the grease injection being completed and the grease injection valve being closed;

[0061] External pressure can be provided by a grease gun; in the filling state, the gun head of the grease gun extends into the locking screw hole 610, and the grease gun pressurizes and drives the valve core 20 to move in the direction away from the valve cap 60, compressing the elastic member 40. When the first step surface 210 moves into the grease outlet channel 120, the sealing grease can enter the valve chamber to be sealed from the grease outlet channel 120; in the locking state, the grease gun releases pressure, and the gas pressure and the elastic member 40 drive the valve core 20 to move in the direction close to the valve cap 60, and the elastic member 40 restores its original length, so that the first step surface 210 abuts against the plug 30.

[0062] It should also be noted that the first sealing member 50 is a sealing gasket, which is planar in shape and has good elasticity and scalability. When the sealing gasket abuts against the first step surface 210, the sealing gasket is squeezed to produce a planar soft sealing effect.

[0063] like Figure 2 , Figure 3 As shown, in some embodiments, the valve core 20 includes a penetration section 220 and a locking section 230; the penetration section 220 is penetrated by the plug 30; the locking section 230 is arranged at one end of the penetration section 220, and the diameter of the locking section 230 is larger than the diameter of the penetration section 220 to form a first step surface 210.

[0064] The first step surface 210 is formed by arranging the penetration section 220 and the locking section 230 with different diameters, thereby providing a structural basis for installing the first sealing member 50 and limiting the position of the valve core 20 .

[0065] It should be noted that a through hole is provided in the plug 30 and penetrates the plug 30 in the axial direction, and the penetration section 220 is penetrated in the through hole.

[0066] like Figure 2 , Figure 3As shown, in some embodiments, the plug 30 includes a first plug section 310, a second plug section 320 and a second sealing member 330; the second plug section 320 is disposed at one end of the first plug section 310 and is threadedly connected to the grease injection channel 110, and the diameter of the second plug section 320 is smaller than that of the first plug section 310 to form a step surface of the plug 30 abutting against the end surface of the valve body 10; the second sealing member 330 is disposed between the step surface of the plug 30 and the end surface of the valve body 10.

[0067] The step surface of the plug 30 is formed by providing the first plug section 310 and the second plug section 320 with different diameters, which not only serves as a limit for the installation of the plug 30, but also can squeeze the second seal 330 to deform the second seal 330, thereby improving the sealing effect.

[0068] It should be noted that the second sealing member 330 is a sealing ring.

[0069] like Figure 2 , Figure 3 As shown, in some embodiments, the grease injection valve further includes a valve bonnet 60 , which is threadedly connected to an end of the valve body 10 away from the grease outlet passage 120 , wherein the plug 30 is located inside the valve bonnet 60 .

[0070] It should be noted that a fixing screw hole and a light hole are also provided in the valve bonnet 60. The fixing screw hole is located at one end of the valve bonnet 60 and is threadedly connected to the valve body. The locking screw hole 610 is provided at the other end of the valve bonnet 60, and the locking screw hole 610 is connected with the fixing screw hole through the light hole. The light hole provides installation for the plug 30, and the first plug section 310 is located in the light hole.

[0071] like Figure 2 , Figure 3 As shown, in some embodiments, a locking screw hole 610 communicating with the plug 30 is provided in the valve cap 60 , wherein in the locked state, the valve core 20 is threadedly connected to the locking screw hole 610 .

[0072] The valve core 20 is threadedly connected to the locking thread to squeeze the seal again, thereby further improving the sealing effect and avoiding leakage. At the same time, the position of the valve core 20 is fixed to prevent the valve core 20 from shifting.

[0073] It should be noted that, in the filling state, the valve core 20 is not connected to the locking screw hole 610; in addition, in the locking state, the first step surface 210 of the valve core 20 first abuts against the seal, thereby squeezing the seal and producing a planar soft sealing effect; then the valve core 20 can be rotated with a screwdriver to screw the valve core 20 into the locking screw hole 610, squeezing the seal again to further improve the sealing effect and fix the position of the valve core 20.

[0074] It should also be noted that the penetration section 220 is threadedly connected to the locking screw hole 610, and a locking thread is provided on the outer wall of the end of the penetration section 220 away from the locking section 230.

[0075] like Figure 4 , Figure 5 As shown, in some embodiments, the grease injection valve also includes a pressure relief cap 70, which is threadedly connected to one end of the valve body 10 away from the grease outlet channel 120, and the pressure relief cap 70 is located outside the plug 30. The pressure relief cap 70 is inserted into the grease injection channel 110 and is connected to the valve core 20, and a pressure relief hole 7102 is provided on the pressure relief cap 70; wherein, when in a stuck state, the pressure relief cap 70 can drive the valve core 20 to move to release the jam.

[0076] The pressure relief cap 70 is provided to release the jam. When jam occurs, the pressure relief cap 70 is rotated, and the valve core 20 moves up and down in the axial direction, thereby releasing the jam. In the jam state, the valve cap 60 is removed, and the pressure relief cap 70 is connected to the valve body 10 and the valve core 20. The pressure relief cap 70 is rotated, and the valve core 20 moves downward in the axial direction. When the first step surface 210 is located below the upper end of the grease outlet channel 120, the pressure is released through the pressure relief hole 7102 to discharge the small bubbles in the sealing grease. Then, the pressure relief cap 70 is rotated forward and backward to allow the valve core 20 to reciprocate in the axial direction, thereby releasing the jam.

[0077] It should be noted that the stuck state is caused by foreign matter, dry and hard sealing grease, etc. in the grease injection valve. In the prior art, the method of adding cleaning agent to soak and unblock is usually used to deal with the stuck state, which is extremely inconvenient and increases the workload and difficulty of handling. Compared with the cleaning agent soaking to unblock, the utility model adopts the pressure relief cap 70 to drive the valve core 20 to move and unblock, which is simple, convenient and reliable.

[0078] like Figure 4 , Figure 5 As shown, in some embodiments, a release screw hole 240 is provided at one end of the valve core 20 away from the elastic member 40 .

[0079] By providing a threaded connection between the release screw hole 240 and the pressure relief cap 70, a detachable connection between the valve core 20 and the pressure relief cap 70 is achieved, thereby facilitating disassembly and assembly.

[0080] It should be noted that the unlocking screw hole 240 is disposed on the penetration section 220 .

[0081] like Figure 4 , Figure 5As shown, in some embodiments, the pressure relief cap 70 includes a cap head 710 and a push rod 720; an end of the cap head 710 away from the pressure relief hole 7102 is provided with a mounting screw hole 7101, and the mounting screw hole 7101 is communicated with the pressure relief hole 7102; one end of the push rod 720 extends into the mounting screw hole 7101 and is connected to the cap head 710; wherein the mounting screw hole 7101 is threadedly connected to the valve body, and the end of the push rod 720 away from the cap head 710 is threadedly connected to the unlocking screw hole 240.

[0082] It should be noted that if Figure 5 As shown, a transition hole is also provided in the cap head 710 , and the mounting screw hole 7101 is connected with the pressure relief hole 7102 through the transition hole. The transition hole provides an installation space for the plug 30 , and the first plug section 310 is located in the transition hole.

[0083] like Figure 1-Figure 3 As shown, in some embodiments, the grease outlet channel 120 extends along the axial direction to the end surface of the valve body 10 away from the plug 30 .

[0084] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A grease injection valve, characterized in that: include: A valve body, wherein a grease injection channel is provided in the valve body and penetrates the valve body in the axial direction, and a plurality of grease outlet channels are provided on the outer wall of the valve body, and the plurality of grease outlet channels are arranged circumferentially around the grease injection channel and communicate with the grease injection channel; A valve core is movably disposed in the grease injection channel, and the valve core has a first step surface; A plug, threadedly connected to an end of the grease injection channel away from the grease outlet channel; An elastic member, located below the valve core; as well as A first sealing member is disposed on the first step surface; The external pressure and the elastic member can drive the valve core to move along the axial direction to control the on and off of the grease injection valve.

2. The grease injection valve according to claim 1, characterized in that: In the filling state, the external pressure drives the valve core to move in a direction away from the plug and compresses the elastic member, so that the first step surface is located below the top of the grease outlet channel, so that the filled sealing grease is discharged through the grease outlet channel; In the locked state, the external pressure and the elastic member drive the valve core to move in a direction close to the plug, so that the valve core passes through the plug and the first sealing member abuts against the plug.

3. The grease injection valve according to claim 1, characterized in that: The valve core comprises: a penetration section, which is penetrated through the plug; and A locking section is arranged at one end of the penetration section, and a diameter of the locking section is larger than a diameter of the penetration section to form the first step surface.

4. The grease injection valve according to claim 1, characterized in that: The plug includes: The first plugging section; a second plugging section, which is disposed at one end of the first plugging section and is threadedly connected to the grease injection channel, wherein the diameter of the second plugging section is smaller than that of the first plugging section to form a plugging step surface abutting against the end surface of the valve body; and The second sealing member is arranged between the step surface of the plug and the end surface of the valve body.

5. The grease injection valve according to any one of claims 1 to 4, characterized in that: The grease injection valve further comprises a valve bonnet, which is threadedly connected to an end of the valve body away from the grease outlet passage, wherein the plug is located inside the valve bonnet.

6. The grease injection valve according to claim 5, characterized in that: A locking screw hole communicating with the plug is arranged in the valve cap, wherein in a locked state, the valve core is threadedly connected with the locking screw hole.

7. The grease injection valve according to any one of claims 1 to 4, characterized in that: The grease injection valve further comprises a pressure relief cap, which is threadedly connected to one end of the valve body away from the grease outlet channel, is located outside the plug, is inserted into the grease injection channel and is connected to the valve core, and is provided with a pressure relief hole; Wherein, when in a stuck state, the pressure relief cap can drive the valve core to move to release the blockage.

8. The grease injection valve according to claim 7, characterized in that: An unlocking screw hole is arranged at one end of the valve core away from the elastic member.

9. The grease injection valve according to claim 8, characterized in that: The pressure relief cap comprises: A cap head, wherein one end of the cap head away from the pressure relief hole is provided with a mounting screw hole, and the mounting screw hole is connected to the pressure relief hole; and A push rod, one end of which extends into the mounting screw hole and is connected to the cap head; The mounting screw hole is threadedly connected to the valve body, and one end of the push rod away from the cap head is threadedly connected to the unlocking screw hole.

10. The grease injection valve according to claim 1, characterized in that: The grease outlet channel extends along the axial direction to an end surface of the valve body away from the plug.

Images