Flow control valve with lining convenient to replace

Abstract

The utility model relates to the technical field of valves, and provides a flow control valve which is resistant to corrosion and impact, long in service life and convenient to replace a lining. Comprising a valve body, an upper valve cover arranged on the valve body, a fluid channel formed in the valve body in a penetrating mode and a valve rod which is arranged on the upper valve cover through a driving device in an up-down sliding mode, one end of the valve rod is located in the valve body, and the other end of the valve rod is located outside the valve body. A connecting channel used for being communicated with the fluid channel is formed in the valve element. The valve is characterized in that an isolating device used for preventing a corrosive medium from being in direct contact with the valve body is detachably arranged in the valve body.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a flow control valve with an inner lining that is convenient to replace. Background Art

[0002] With the development of the times, flow control valves are increasingly used in steam power generation, oil and gas extraction, petroleum extraction and refining. The current flow control valve, due to the process structure and material reasons, the valve body will be quickly corroded after contact with oil and gas. In order to avoid rapid corrosion of the valve body, the manufacturer usually electroplates the valve body to enhance corrosion resistance. However, after the plating layer is damaged, the entire valve body needs to be electroplated again. At this time, a new valve needs to be used to replace the damaged valve, and then the damaged valve needs to be taken for repair. The maintenance cost is too high and the economic benefit is low. Utility Model Content

[0003] Therefore, in view of the above problems, the utility model proposes a flow control valve which is corrosion-resistant, impact-resistant, has a long service life and is easy to replace the lining.

[0004] To achieve the above-mentioned purpose, the technical solution of the utility model is to provide a flow control valve which is easy to replace the liner, comprising: a valve body, an upper valve cover arranged on the valve body, a fluid channel which penetrates and is opened in the valve body, a valve stem which can slide up and down on the upper valve cover and is located at one end inside the valve body and the other end outside the valve body through a driving device, the valve stem is provided with a valve core for sealing the fluid channel, the valve core is provided with a connecting channel for connecting the fluid channel, and it is characterized in that: an isolation device for preventing corrosive media from directly contacting the valve body is detachably arranged in the valve body.

[0005] A further improvement is that the isolation device includes: a flow channel liner arranged at both ends of the fluid channel to prevent the valve body from being corroded, a valve cage arranged in the valve body through a positioning device to prevent the valve body from being corroded, and a valve seat arranged on the valve cage for cooperating with the valve core to seal, and the valve cage is also provided with a connecting device for connecting the connecting channel and the flow channel liner.

[0006] Further improvement is that: the positioning device includes: a mounting hole opened at the bottom of the valve body and located between the valve core and the fluid channel, a limit platform arranged on the mounting hole for preventing the valve cage from moving toward the valve stem end, the valve cage resists the limit platform, and a lower valve cover is also arranged on the mounting hole for preventing the valve cage from moving away from the valve stem end, and a rotation stop device is arranged between the valve cage and the flow channel liner.

[0007] A further improvement is that the anti-rotation device comprises a snap-fit ​​hole formed on the valve cage and matching the outer diameter of the flow channel liner, and the flow channel liner is inserted into the snap-fit ​​hole.

[0008] A further improvement is that a stop liner is provided between the lower valve cover and the cage to prevent the lower valve cover from being corroded, and the stop liner is a ceramic stop liner.

[0009] A further improvement is that the flow channel liner is a ceramic flow channel liner tube for enhancing corrosion resistance, and the valve cage is a ceramic valve cage for enhancing corrosion resistance.

[0010] A further improvement is that the valve core is a ceramic valve core for enhancing the corrosion resistance of the valve core.

[0011] A further improvement is that the connecting device includes: a liner connecting port opened on the valve cage and matching the inner diameter of the flow channel liner, and a valve core connecting port opened on the valve cage and matching the inner diameter of the connecting channel. The inner diameter of the connecting channel is smaller than the inner diameter of the flow channel liner and is used to enhance the strength of the valve core. The liner connecting port is connected to the valve core connecting port through a transition device.

[0012] A further improvement is that the transition device includes a transition channel opened between the liner connection port and the valve core connection port, and a tilting block arranged in the transition channel for bearing the impact of the medium.

[0013] A further improvement is that the driving device comprises a cylinder fixedly arranged on the upper valve cover, and the telescopic rod of the cylinder is fixedly connected to the valve stem.

[0014] The advantages and beneficial effects of the utility model are:

[0015] The structure is simple, and an isolation device is provided on the removable and replaceable valve body to prevent the valve body from direct contact with the corrosive medium, prevent the corrosive medium from corroding the inside of the valve body, and extend the service life of the valve. Furthermore, each component of the isolation device is made of ceramic material with strong corrosion resistance, which can greatly extend the service life, and the valve cage can also absorb the compression force from the pipeline and the impact of the medium for the valve core, thereby extending the service life of the valve core and then extending the service life of the entire valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional partial cross-sectional schematic diagram of a flow control valve of the utility model;

[0017] Figure 2 This is a schematic cross-sectional view of a flow control valve according to the utility model;

[0018] In the figure: 1. valve body; 2. upper valve cover; 3. fluid channel; 4. valve stem; 5. valve core; 6. connecting channel; 7. flow channel liner; 8. valve cage; 9. valve seat; 10. mounting hole; 11. limit platform; 12. lower valve cover; 13. engaging hole; 14. stop liner; 15. liner connection port; 16. valve core connection port; 17. transition channel; 18. tilting block; 19. cylinder. DETAILED DESCRIPTION

[0019] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0020] like Figure 1-Figure 2 As shown, a flow control valve with easy replacement of lining comprises: a valve body 1, an upper valve cover 2 arranged on the valve body 1, a fluid channel 3 penetrating and opened in the valve body 1, a valve stem 4 which is arranged on the upper valve cover 2 and can slide up and down by a driving device and has one end located in the valve body 1 and the other end located outside the valve body 1, a valve core 5 for sealing the fluid channel 3 is arranged on the valve stem 4, a connecting channel 6 for connecting the fluid channel 3 is opened on the valve core 5, and an isolating device for preventing corrosive media from directly contacting the valve body 1 is detachably arranged in the valve body 1.

[0021] In order to prevent the corrosive medium from contacting the inside of the valve body 1, the isolation device includes: a flow channel liner 7 arranged at both ends of the fluid channel 3 to prevent the valve body 1 from being corroded, a valve cage 8 arranged in the valve body 1 through a positioning device to prevent the valve body 1 from being corroded, and a valve seat 9 arranged on the valve cage 8 to cooperate with the valve core 5 for sealing. The valve cage 8 is also provided with a connecting device for connecting the connecting channel 6 and the flow channel liner 7.

[0022] In order to facilitate the installation of the valve cage 8, the positioning device includes: a mounting hole 10 opened at the bottom of the valve body 1 and located between the valve core 5 and the fluid channel 3, a limit platform 11 arranged on the mounting hole 10 for preventing the valve cage 8 from moving toward the end of the valve stem 4, the valve cage 8 resists the limit platform 11, and a lower valve cover 12 is also arranged on the mounting hole 10 for preventing the valve cage 8 from moving away from the end of the valve stem 4, and a rotation stop device is arranged between the valve cage 8 and the flow channel liner 7.

[0023] In order to prevent the valve cage 8 from rotating and preliminarily position the valve cage 8 , the anti-rotation device includes: a clamping hole 13 formed on the valve cage 8 and matching the outer diameter of the flow channel liner 7 , and the flow channel liner 7 is inserted into the clamping hole 13 .

[0024] In order to prevent the lower valve cover 12 from being corroded, a stop liner 14 is provided between the lower valve cover 12 and the valve cage 8 for preventing the lower valve cover 12 from being corroded. The stop liner 14 is a ceramic stop liner 14 .

[0025] In order to extend the service life, the flow channel liner 7 is a ceramic flow channel liner tube for enhancing corrosion resistance, the valve cage 8 is a ceramic valve cage 8 for enhancing corrosion resistance, and the valve core 5 is a ceramic valve core 5 for enhancing corrosion resistance of the valve core 5.

[0026] The valve core 5 is: an alumina ceramic valve core, a zirconium oxide ceramic valve core, a silicon nitride ceramic valve core, a silicon carbide ceramic valve core or a titanium carbide ceramic valve core.

[0027] The valve cage 8 is: an alumina ceramic valve cage, a zirconium oxide ceramic valve cage, a silicon nitride ceramic valve cage, a silicon carbide ceramic valve cage or a titanium carbide ceramic valve cage.

[0028] The flow channel liner 7 is: an alumina ceramic flow channel liner, a zirconium oxide ceramic flow channel liner, a silicon nitride ceramic flow channel liner, a silicon carbide ceramic valve core or a titanium carbide ceramic flow channel liner.

[0029] The stop liner 14 is: an alumina ceramic stop liner, a zirconium oxide ceramic stop liner, a silicon nitride ceramic stop liner, a silicon carbide ceramic stop liner or a titanium carbide nitride ceramic stop liner.

[0030] In order to connect the valve cage 8, the valve core 5, and the fluid channel 3, the connecting device includes: a liner connecting port 15 opened on the valve cage 8 and matching the inner diameter of the flow channel liner 7, and a valve core 5 connecting port opened on the valve cage 8 and matching the inner diameter of the connecting channel 6. The inner diameter of the connecting channel 6 is smaller than the inner diameter of the flow channel liner 7 and is used to enhance the strength of the valve core 5. The liner connecting port 15 is connected to the valve core 5 connecting port through a transition device.

[0031] In order to reduce the impact force of the medium on the valve core 5, the transition device includes: a transition channel 17 opened between the liner connection port 15 and the valve core 5 connection port, and a tilting block 18 arranged in the transition channel 17 for bearing the impact of the medium.

[0032] In order to facilitate the control of the opening and closing state of the valve, the driving device includes: a cylinder 19 fixedly arranged on the upper valve cover 2, and a telescopic rod of the cylinder 19 is fixedly connected to the valve stem 4.

[0033] Working principle: When assembling the valve, first insert the valve cage 8 into the mounting hole 10 so that it resists against the limit platform 11, and then insert the flow channel liner 7 into the fluid channel 3 to complete the engagement and preliminary positioning of the valve cage 8, and finally install the stop liner 14 and the lower valve cover 12 on the bottom of the valve cage 8 to complete the assembly. The flow channel liner 7 is limited by the engagement hole 13 and the pipe body of the external pipeline to prevent the flow channel liner 7 from displacement.

[0034] When in use, the cylinder 19 is started, driving the valve stem 4 and the valve core 5 to slide up and down in the valve cage 8. When the connecting channel 6 is connected to the connecting port of the valve core 5, the medium can pass through the valve. When the connecting channel 6 is not connected to the connecting port of the valve core 5, the valve can be closed.

[0035] The basic principles, main features and advantages of the utility model are shown and described above. Those skilled in the art should understand that the utility model is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which shall fall within the scope of the utility model to be protected. The scope of protection of the utility model shall be defined by the attached claims and their equivalents.

Claims

1. A flow control valve that is easy to replace the liner, comprising: A valve body, an upper valve cover arranged on the valve body, a fluid channel extending through the valve body, a valve stem arranged on the upper valve cover and capable of sliding up and down through a driving device and with one end located inside the valve body and the other end located outside the valve body, the valve stem being provided with a valve core for sealing the fluid channel, the valve core being provided with a connecting channel for connecting the fluid channel, and characterized in that: an isolating device for preventing corrosive media from directly contacting the valve body is detachably provided in the valve body.

2. A flow control valve with easy replacement of liner according to claim 1, characterized in that: The isolation device includes: a flow channel liner arranged at both ends of the fluid channel to prevent the valve body from being corroded, a valve cage arranged in the valve body through a positioning device to prevent the valve body from being corroded, and a valve seat arranged on the valve cage for cooperating with the valve core to seal. The valve cage is also provided with a connecting device for connecting the connecting channel and the flow channel liner.

3. A flow control valve with easy replacement of liner according to claim 2, characterized in that: The positioning device includes: a mounting hole opened at the bottom of the valve body and located between the valve core and the fluid channel, a limit platform arranged on the mounting hole to prevent the valve cage from moving toward the valve stem end, the valve cage resists the limit platform, and a lower valve cover is also arranged on the mounting hole to prevent the valve cage from moving away from the valve stem end, and a rotation stop device is arranged between the valve cage and the flow channel liner.

4. A flow control valve with easy replacement of liner according to claim 3, characterized in that: The anti-rotation device comprises: a clamping hole which is arranged on the valve cage and matches the outer diameter of the flow channel liner, and the flow channel liner is inserted into the clamping hole.

5. A flow control valve with easy replacement of liner according to claim 3, characterized in that: A stop liner is also provided between the lower valve cover and the valve cage to prevent the lower valve cover from being corroded. The stop liner is a ceramic stop liner.

6. A flow control valve with easy replacement of liner according to claim 2, characterized in that: The flow channel liner is a ceramic flow channel liner tube for enhancing corrosion resistance, and the valve cage is a ceramic valve cage for enhancing corrosion resistance.

7. A flow control valve with easy replacement of liner according to claim 1, characterized in that: The valve core is a ceramic valve core.

8. A flow control valve with easy replacement of liner according to claim 2, characterized in that: The connecting device includes: a liner connecting port opened on the valve cage and matching the inner diameter of the flow channel liner, and a valve core connecting port opened on the valve cage and matching the inner diameter of the connecting channel. The inner diameter of the connecting channel is smaller than the inner diameter of the flow channel liner and is used to enhance the strength of the valve core. The liner connecting port is connected to the valve core connecting port through a transition device.

9. A flow control valve according to claim 8, characterized in that: The transition device comprises: a transition channel opened between the liner connection port and the valve core connection port, and an inclined block arranged in the transition channel for bearing the impact of the medium.

10. A flow control valve according to claim 1, characterized in that: The driving device comprises: a cylinder fixedly arranged on the upper valve cover, and a telescopic rod of the cylinder is fixedly connected to the valve stem.

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