Pipe-in-pipe control valve and pipe-in-pipe control valve assembly

Abstract

The utility model relates to the technical field of pipeline control valves, in particular to a pipe-in-pipe control valve and a pipe-in-pipe control valve assembly, which are used for controlling an inner flow channel or an outer flow channel of a pipe-in-pipe and comprise a mounting base, a control assembly is arranged on the mounting base, and the mounting base and the control assembly are matched to form a mounting cavity; the mounting base is provided with a mounting part, a liquid inlet channel and a liquid outlet channel which are used for being communicated with the inner flow channel / the outer flow channel are formed in the mounting part, the liquid inlet channel and the liquid outlet channel are communicated through the mounting cavity, and the control assembly is used for connecting or disconnecting the liquid inlet channel and the liquid outlet channel; wherein a check valve assembly is arranged in the liquid outlet channel, and the check valve assembly is used for preventing backflow. Preferably, the check valve assembly comprises an annular check seat, a valve rod and a valve rod, and a through hole is formed in the check seat; the non-return ball is arranged between the liquid outlet of the liquid outlet channel and the non-return seat; when liquid at the liquid outlet of the liquid outlet channel flows back, the check ball can block the through hole, and therefore series flow is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline control valve technical field especially control valve for pipe in pipe and control valve assembly for pipe in pipe. BACKGROUND

[0002] At present, in order to facilitate the installation of pipeline, many families start to choose pipe in pipe pipeline, which mainly includes inner tube body and outer tube body, the inner flow channel is formed in the inner tube body, and the outer flow channel is formed between the inner tube body and the outer tube body. When normally used, because the diameter of the inner flow channel is relatively small, it has the characteristics of inner tube body preferential water and fast water; when the water demand is relatively large, double flow channel water can be used. It can also be applied to drinking water system or hot water circulation system or geothermal circulation system, at this time, the water of the inner flow channel and the outer flow channel can be used in circulation, because the system is relatively large, there are water pump operation cost, liquid heat loss and the like.

[0003] However, the products on the market still have the following problems:

[0004] As disclosed in a valve mounting seat and diaphragm type control valve in Chinese patent No. CN201922499259.6, when the control valve is used to control the water flow direction in the pipeline, the liquid in the pipeline is prone to backflow, which not only affects the normal flow of the liquid in the pipeline, but also causes the hot water and cold water to mix to form a mixed flow, resulting in the occurrence of the flow in the pipeline. Utility model content

[0005] The utility model aims at providing a control valve for pipe in pipe and control valve assembly for pipe in pipe to improve the existing pipe in pipe pipeline in the running state prone to the occurrence of the flow.

[0006] The utility model aims at realizing as follows:

[0007] A control valve for pipe in pipe is used to control the inner flow channel or the outer flow channel of the pipe in pipe, comprising a mounting base, a control assembly is arranged on the mounting base, and the mounting base and the control assembly cooperate to form a mounting cavity;

[0008] The mounting base has a mounting portion, a liquid inlet channel and a liquid outlet channel for communicating the inner flow channel / outer flow channel are arranged in the mounting portion, the liquid inlet channel and the liquid outlet channel are communicated through the mounting cavity, and the control assembly is used to conduct or block the liquid inlet channel and the liquid outlet channel;

[0009] Among them, the liquid outlet channel is provided with a check valve assembly, and the check valve assembly is used to prevent backflow.

[0010] Preferably, the check valve assembly comprises:

[0011] a check seat which is annular, and a through hole is formed inside the check seat;

[0012] a check ball which is arranged between the liquid outlet of the liquid outlet channel and the check seat;

[0013] When the liquid in the liquid outlet of the liquid outlet channel flows back, the check ball can block the through hole, so as to prevent the occurrence of cross flow.

[0014] Preferably, an anti-skid convex ring part is formed on the outside of the check seat, and the anti-skid convex ring part is formed with a resistance surface and a boost surface;

[0015] When the check seat is arranged in the liquid outlet channel, the boost surface faces the liquid outlet.

[0016] Preferably, the check ball is a floating ball.

[0017] Preferably, a grid net is formed at the liquid outlet.

[0018] Preferably, a filter net is arranged in the liquid inlet channel.

[0019] Preferably, the control assembly comprises:

[0020] an actuator arranged on the mounting base; and

[0021] a valve core arranged on the push rod of the actuator, for blocking the liquid inlet channel or / and the liquid outlet channel.

[0022] Preferably, a mounting groove is further formed on the mounting base;

[0023] a ring groove is recessed on the diaphragm, so that an outer peripheral part and a central part are formed on the diaphragm; the outer peripheral part can be placed into the mounting groove, and the central part can block the liquid inlet channel or the liquid outlet channel.

[0024] A control valve assembly for pipe-in-pipe, comprising a pipe-in-pipe connector and a control valve, the control valve is the control valve for pipe-in-pipe as described above,

[0025] The pipe-in-pipe connector comprises:

[0026] an outer pipe body, on which a connecting part is formed, the connecting part is used for mounting the mounting base; and

[0027] an inner pipe body arranged in the outer pipe body, and forming two pipe-in-pipe connecting parts of the pipe-in-pipe;

[0028] an inner flow channel is formed in the inner pipe body, and an outer flow channel is formed between the outer pipe body and the inner pipe body;

[0029] The liquid inlet channel and the liquid outlet channel of the mounting base are respectively communicated with the inner flow channel / outer flow channel of the corresponding pipe-in-pipe connecting part.

[0030] Preferably, the outer side of the mounting part is formed with a threaded connecting part, and the mounting part can be screwed on the connecting part through the threaded connecting part.

[0031] The utility model discloses compared with prior art prominent and beneficial technical effect is:

[0032] 1、When the pipe-in-pipe control valve is connected with the pipe-in-pipe connecting piece and constitutes the control module, the control module is used for controlling the communication state of the inner flow channel or the outer flow channel.The mounting part in the mounting base is formed with a liquid inlet channel or a liquid outlet channel, wherein the liquid inlet channel is communicated with the inflow end of the outer flow channel or the inner flow channel, and the liquid outlet channel is communicated with the outflow end of the outer flow channel or the inner flow channel.Therefore, by providing the check valve assembly at the liquid outlet channel of the control valve, the liquid in the pipeline can be prevented from entering the liquid inlet channel through the liquid outlet channel, thereby preventing the cross flow between the inner flow channel and the outer flow channel.

[0033] 2、The anti-skid convex ring part is arranged on the circumferential side of the check seat of the check valve assembly, which facilitates the arrangement of the check seat in the liquid outlet channel.Meanwhile, the anti-skid convex ring part can also prevent the check seat from being washed out of the liquid outlet channel when backflow occurs.

[0034] 3、The filter screen is arranged in the liquid inlet channel or the liquid outlet channel of the control valve, which can filter the circulating liquid in the pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is the structural schematic diagram of the utility model;

[0036] Figure 2 It is the explosion drawing of the utility model;

[0037] Figure 3 It is the sectional view of the utility model;

[0038] Figure 4 It is the sectional view of the utility model; Figure 3 It is the enlarged view of A in the utility model;

[0039] Figure 5 It is the structural diagram of the check seat of the utility model;

[0040] Figure 6 It is the enlarged view of B in the utility model; Figure 3

[0041] It is the structural schematic diagram when the utility model is connected with the inner flow channel; Figure 7

[0042] Figure 8 It is the structural schematic diagram when the utility model is connected with the outer flow channel.​

[0043] Reference signs:

[0044] 1, mounting base; 11, liquid inlet channel; 12, liquid outlet channel; 13, mounting cavity; 14, mounting groove; 15, grid; 16, filter screen; 17, shell;

[0045] 2, mounting part; 21, threaded connection part; 22, liquid outlet; 23, liquid inlet;

[0046] 3, control assembly; 31, limiting sleeve; 32, push rod; 33, adjusting spring; 34, diaphragm; 35, annular groove; 36, outer peripheral part; 37, central part; 38, actuator;

[0047] 4, check valve assembly; 41, check valve seat; 42, through hole; 43, check valve ball; 44, anti-skid convex ring part; 45, resistance surface; 46, boost surface;

[0048] 5, pipe-in-pipe connector; 51, outer pipe body; 52, inner pipe body; 53, outer flow channel; 531, outer flow channel water inlet section; 532, outer flow channel water outlet section; 533, outer flow channel water blocking part; 54, inner flow channel; 541, inner flow channel water inlet section; 542, inner flow channel water outlet section; 543, inner flow channel water blocking part; 55, connecting part. DETAILED DESCRIPTION

[0049] The following are specific embodiments of the present application, and the technical solutions of the present application will be further described in combination with the drawings, but the present application is not limited to these embodiments.

[0050]

Embodiment One

[0051] As shown in Figures 1-3 and Figure 7 A pipe-in-pipe control valve for controlling the inner flow channel 54 or the outer flow channel 53 of the pipe-in-pipe, comprising a mounting base 1, the mounting base 1 is provided with a control assembly 3, the mounting base 1 and the control assembly 3 cooperate to form a mounting cavity 13, and the control assembly 3 is arranged in the mounting cavity 13.

[0052] The mounting base 1 has a mounting part 2, and a liquid inlet channel 11 and a liquid outlet channel 12 are arranged in the mounting part 2. The liquid inlet channel 11 is in communication with the liquid inlet 23 of the mounting part 2, and the liquid outlet channel 12 is in communication with the liquid outlet 22 of the mounting part 2. The liquid inlet channel 11 and the liquid outlet channel 12 of the mounting part 2 are communicated through the mounting cavity 13, and the control assembly 3 is used to open or block the liquid inlet channel 11 and the liquid outlet channel 12.

[0053] Because in the pipeline system, there may be local hydraulic pressure too large, resulting in backflow of liquid, the liquid flow to the wrong direction or into the wrong position, forming a string flow. String flow will affect the flow rate of liquid in the pipeline, resulting in abnormal actuator action, affecting the normal work of the pipeline.

[0054] And in the heating system, the liquid in the pipeline occurs string flow, which is easy to cause hot water and cold water mixing, affecting the circulation of liquid in the pipeline, further affecting the heating efficiency of the heating system.

[0055] In the technical solution, the outlet passage 12 is provided with a check valve assembly 4, which is used to prevent the liquid in the outflow channel 53 from flowing into the outlet passage 12 through the outlet 22, thereby preventing the occurrence of string flow.

[0056] As shown in Figures 1-3 The check valve assembly 4 comprises:

[0057] The check seat 41 is annular, and a through hole 42 is formed in the inside of the check seat 41, which is used for the liquid in the pipeline to pass through.

[0058] The check ball 43 is arranged between the outlet 22 of the outlet passage 12 and the check seat 41.

[0059] When the check seat 41 is arranged in the outlet passage 12, if backflow occurs, the liquid enters the outlet passage 12 through the outlet 22 of the outlet passage 12, the check ball 43 can block the through hole 42, so that the outlet passage 12 is blocked, preventing the liquid from further flowing into the installation cavity 13 and the inlet passage 11, thereby achieving the purpose of preventing the occurrence of string flow.

[0060] As shown in Figures 1-6 The outer side of the check seat 41 is formed with an anti-skid convex ring part 44, which is formed with a resistance surface 45 and a boost surface 46.

[0061] When the check seat 41 is arranged in the outlet passage 12, the boost surface 46 faces the outlet 22.

[0062] As a preferred technical solution, the boost surface 46 is an inclined surface, the resistance surface 45 is horizontal, and one side of the boost surface 46 is connected with the resistance surface 45, so that the cross section of the anti-skid convex ring part 44 is triangular.

[0063] Therefore, when the check valve 41 is placed into the outlet channel 12, the pushing surface 46 contacts the side wall of the outlet channel 12, making it easy for the anti-slip protrusion 44 to deform, so that the check valve 41 can be pushed into the outlet channel 12. Furthermore, after the check valve 41 is pushed into the outlet channel 12, the edge of the anti-slip protrusion 44 deforms upwards as the check valve 41 moves within the outlet channel 12. This creates an interference fit between the check valve 41 and the outlet channel 12, fixing the position of the check valve 41.

[0064] When backflow occurs in the pipeline, that is, when liquid enters the outlet channel through the outlet 22 of the outlet channel 12, the pressure of the backflowing liquid will push the check ball 43 close to the check seat 41 and cause the check ball 43 to block the through hole 42.

[0065] When the check ball 43 pushes the check seat 41 upward, the anti-slip protrusion 44 deforms upward at this time. The resistance generated between the resistance surface 45 and the side wall of the liquid outlet channel 12 is greater than the resistance generated between the push surface 46 and the side wall of the liquid outlet channel 12 when the check seat 41 is placed into the liquid outlet channel 12, thereby restricting the check seat 41 from being pushed out of the liquid outlet channel 12.

[0066] As another preferred technical solution, the check ball 43 is a float ball. When the check seat 41 is placed above the check ball 43, the check ball 43 can approach the check seat 41 more quickly due to buoyancy, thereby closing the liquid outlet channel 12 more quickly and making the pipeline operation more stable.

[0067] Furthermore, a grid 15 is formed at the outlet 22, preventing the check ball 43 from passing through the grid 15. At the same time, the grid 15 can intercept larger impurities and dirt in the flow channel, preventing large particles of impurities from entering the control valve through the outlet channel 12 during backflow, thus playing a filtering role.

[0068] like Figures 1-6 As shown, a filter screen 16 is installed in the liquid inlet channel. The fine pores on the filter screen 16 can effectively prevent large particles of dirt in the water from entering the control valve, ensuring that the control valve can operate stably.

[0069] like Figures 1-7 As shown, control component 3 includes:

[0070] Actuator 38 is mounted on mounting base 1, and actuator 38 and mounting base 1 cooperate to form mounting cavity 13;

[0071] The valve core is mounted on the push rod 32 of the actuator 38 and is used to block the liquid inlet channel 11 and / or the liquid outlet channel 12.

[0072] In the embodiment, the actuator 38 is an electromagnetic valve, and the actuator 38 can control the push rod 32 to extend or retract from inside the actuator 38, so as to realize the movement of the valve core driven by the push rod 32.

[0073] The valve core is a diaphragm 34 connected with the push rod 32, so that the push rod 32 can drive the diaphragm 34 to move.

[0074] When the push rod 32 descends, the push rod 32 drives the diaphragm 34 to move downward, so that the diaphragm 34 blocks the liquid inlet channel 11 and / or the liquid outlet channel 12, thereby blocking the liquid inlet channel 11 and the liquid outlet channel 12.

[0075] When the push rod 32 ascends, the push rod 32 drives the diaphragm 34 to move upward, so that the diaphragm 34 no longer blocks the liquid inlet channel 11 and / or the liquid outlet channel 12, thereby making the liquid inlet channel 11 and the liquid outlet channel 12 conductive to each other, so that the liquid in the liquid inlet channel 11 enters the liquid outlet channel 12.

[0076] As a preferred embodiment, the actuator 38 is further provided with an adjusting spring 33, one end of the adjusting spring 33 is sleeved on the outside of the push rod 32, and the other end of the adjusting spring 33 abuts against the inner side wall of the actuator 38. The adjusting spring 33 can exert a force on the push rod 32 in the direction of pushing out of the actuator 38, so that when it is necessary to block the water flow, the push rod 32 can drive the valve core to move more quickly.

[0077] Further, the mounting base 1 is further provided with a shell 17, and the actuator 38 is arranged in the shell 17, so that the position of the actuator 38 can be further fixed.

[0078]

Embodiment Two

[0079] The embodiment is basically the same as the first embodiment, as shown in Figure 3 and Figure 4 The mounting base 1 is further formed with a mounting groove 14.

[0080] The diaphragm 34 is recessed and formed with an annular groove 35, so that the diaphragm 34 is formed with an outer peripheral portion 36 and a central portion 37. The outer peripheral portion 36 can be arranged in the mounting groove 14, and the central portion 37 can block the liquid inlet channel 11 or the liquid outlet channel 12.

[0081] Further, the actuator 38 is provided with a limiting sleeve 31, the limiting sleeve 31 is formed with a cavity, and the push rod 32 is arranged in the inside of the limiting sleeve 31. The limiting sleeve 31 can limit the movement direction of the push rod 32, so that the push rod 32 can abut against the diaphragm 34 at a position above the central portion 37. The limiting sleeve 31 abuts against the periphery of the upper end surface of the diaphragm 34, so that the outer peripheral portion 36 is limited in the mounting groove 14.

[0082] In the embodiment, the push rod 32 is not connected with the diaphragm 34, so the push rod 32 cannot drive the diaphragm 34 to move. The diaphragm 34 is pressed by the limiting sleeve 31, the outer peripheral part 36 is fixed in the installation groove 14, and the central part 37 can naturally block the end of the liquid inlet channel 11 or the liquid outlet channel 12.

[0083] After the push rod 32 is driven by the actuator 38 to move upward, the push rod 32 is separated from the diaphragm 34, and the push rod 32 does not give pressure to the diaphragm 34. When the liquid pressure in the liquid inlet channel 11 gradually increases, the liquid pressure in the liquid inlet channel 11 can push the central part 37 away, so that the liquid inlet channel 11 and the liquid outlet channel 12 are communicated, and the liquid flows from the liquid inlet channel 11 to the liquid outlet channel 12 under the action of the pressure.

[0084] When backflow occurs in the liquid outlet channel 12, the liquid outlet channel 12 is connected with the outlet of the pipeline, so that the liquid outlet channel 12 does not accumulate too much liquid, and the pressure of the backflow liquid is low and difficult to push the central part 37 away. The liquid outlet channel 12 and the liquid inlet channel 11 still maintain the closed state, so as to further block the backflow liquid and maintain the normal operation of the pipeline.

[0085]

Embodiment Three

[0086] A control valve assembly for a pipe-in-pipe includes a pipe-in-pipe connector 5 and a control valve, which is a control valve for a pipe-in-pipe as described above.

[0087] Specifically, as shown in Figure 1 and Figure 7 , the pipe-in-pipe connector 5 includes:

[0088] an outer pipe body 51, on which a connecting part 55 is formed, the connecting part 55 being used for mounting the mounting base 1; and

[0089] an inner pipe body 52, which is arranged in the outer pipe body 51 and forms two pipe-in-pipe connecting parts for connecting pipes;

[0090] an inner flow channel 54 is formed in the inner pipe body 52, and an outer flow channel 53 is formed between the outer pipe body 51 and the inner pipe body 52.

[0091] In the embodiment, the inner flow channel 54 is formed with an inner flow channel water blocking part 543, which divides the inner flow channel 54 into an inner flow channel water inlet section 541 and an inner flow channel water outlet section 542, and the inner flow channel water inlet section 541 and the inner flow channel water outlet section 542 are open to the inside of the connecting part 55.

[0092] When the mounting portion 2 is connected with the connecting portion 55, the liquid inlet 23 on the mounting portion 2 is aligned with the inner flow passage water inlet section 541, and the liquid outlet 22 of the mounting portion 2 is aligned with the inner flow passage water outlet section 542, so that the liquid in the inner flow passage water inlet section 541 enters the liquid inlet passage 11 in the mounting portion 2 through the liquid inlet 23, and then enters the outer flow passage water outlet section 532 through the liquid outlet 22 of the liquid outlet passage 12, and then flows out of the pipe-in-pipe connecting piece 5.

[0093] Figure 7 The arrow direction is the flow direction of the liquid in the control valve assembly.

[0094] Further, the outer side of the mounting portion 2 is formed with a threaded connecting portion 21.

[0095] The mounting portion 2 can be screwed on the connecting portion 55 through the threaded connecting portion 21, so that the mounting base 1 is arranged on the pipe-in-pipe connecting piece 5.

[0096]

Embodiment Four

[0097] The embodiment and embodiment three are basically the same, and the difference is that:

[0098] Specifically as shown in Figure 1 and Figure 8 In the embodiment, the outer flow passage 53 is formed with an outer flow passage water retaining portion 533, which divides the outer flow passage 53 into an outer flow passage water inlet section 531 and an outer flow passage water outlet section 532, and the outer flow passage water inlet section 531 and the outer flow passage water outlet section 532 are open to the inside of the connecting portion 55.

[0099] When the mounting portion 2 is connected with the connecting portion 55, the liquid inlet 23 on the mounting portion 2 is aligned with the outer flow passage water inlet section 531, and the liquid outlet 22 of the mounting portion 2 is aligned with the outer flow passage water outlet section 532, so that the liquid in the outer flow passage water inlet section 531 enters the liquid inlet passage 11 in the mounting portion 2 through the liquid inlet 23, and then enters the outer flow passage water outlet section 532 through the liquid outlet 22 of the liquid outlet passage 12, and then flows out of the pipe-in-pipe connecting piece 5.

[0100] Figure 8 The arrow direction is the flow direction of the liquid in the control valve assembly.

[0101] It is to be understood that the structures, proportions, sizes, etc. shown in the drawings of the present application are merely intended to facilitate the understanding of the content disclosed in the present application, to be understood and read by those skilled in the art, and are not intended to limit the implementation of the present application. Therefore, any modification of the structure, change of the proportional relationship or adjustment of the size, which does not affect the functions and purposes of the present application, should still fall within the scope of the technical content disclosed by the present application. Meanwhile, the terms such as "upper", "lower" and "intermediate" used in the present application are only for the convenience of clear description, and are not intended to limit the scope of the present application. The change or adjustment of the relative relationship without substantial change of the technical content should also be considered as the implementation of the present application.

[0102] In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

Claims

1. A control valve for pipe-in-pipe systems, used to control the inner flow channel (54) or outer flow channel (53) of a pipe-in-pipe system, characterized in that: Includes a mounting base (1), on which a control component (3) is provided, and the mounting base (1) and the control component (3) cooperate to form a mounting cavity (13); The mounting base (1) has a mounting part (2), and the mounting part (2) has an inlet channel (11) and an outlet channel (12) for connecting the inner flow channel (54) and the outer flow channel (53). The inlet channel (11) and the outlet channel (12) are connected through the mounting cavity (13), and the control component (3) is used to open or close the inlet channel (11) and the outlet channel (12). The liquid outlet channel (12) is provided with a check valve assembly (4), which is used to prevent backflow.

2. The pipe-in-pipe control valve according to claim 1, characterized in that, The check valve assembly (4) includes: Check seat (41), which is annular, and the inside of the check seat (41) has a through hole (42). A check ball (43) is disposed between the outlet (22) of the liquid outlet channel (12) and the check seat (41); When liquid flows back through the outlet (22) of the liquid outlet channel (12), the check ball (43) can block the through hole (42) to prevent crossflow.

3. A pipe-in-pipe control valve according to claim 2, characterized in that: The outer side of the check seat (41) is formed with an anti-slip protrusion (44), and the anti-slip protrusion (44) is formed with a resistance surface (45) and a boosting surface (46). When the check valve (41) is installed in the liquid outlet channel (12), the booster surface (46) faces the liquid outlet (22).

4. A pipe-in-pipe control valve according to claim 2, characterized in that: The check ball (43) is a float.

5. A pipe-in-pipe control valve according to claim 2, characterized in that: A grid mesh (15) is formed at the liquid outlet (22).

6. A pipe-in-pipe control valve according to claim 2, characterized in that: A filter screen (16) is installed in the liquid inlet channel (11).

7. A pipe-in-pipe control valve according to any one of claims 1-6, characterized in that... The control component (3) includes: Actuator (38), which is disposed on the mounting base (1); and A valve core, disposed on the push rod (32) of the actuator (38), is used to block the inlet channel (11) and / or outlet channel (12).

8. A pipe-in-pipe control valve according to claim 7, characterized in that: The mounting base (1) is also formed with a mounting groove (14); The valve core is a diaphragm (34), on which an annular groove (35) is recessed and formed, and the annular groove (35) forms an outer peripheral portion (36) and a central portion (37) on the diaphragm (34); the outer peripheral portion (36) can be placed into the mounting groove (14), and the central portion (37) can close the liquid inlet channel (11) or the liquid outlet channel (12).

9. A control valve assembly for pipe-in-pipe applications, characterized in that: It includes a pipe-in-pipe connector (5) and a control valve, wherein the control valve is the pipe-in-pipe control valve as described in any one of claims 1-8. The pipe-in-pipe connector (5) includes: An outer tube body (51) having a connecting portion (55) formed thereon, the connecting portion (55) being used to mount the mounting base (1); and The inner tube (52) is disposed inside the outer tube (51) and forms a tube-in-tube connection part connecting two tube-in-tubes; An inner flow channel (54) is formed inside the inner tube (52), and an outer flow channel (53) is formed between the outer tube (51) and the inner tube (52). The liquid inlet channel (11) and liquid outlet channel (12) of the mounting base (1) are respectively connected to the inner flow channel (54) / outer flow channel (53) of the corresponding pipe-in-pipe connection.

10. A pipe-in-pipe control valve assembly according to claim 9, characterized in that: The mounting part (2) has a threaded connection part (21) formed on its outer side, through which the mounting part (2) can be threadedly connected to the connection part (55).

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