pinch valve

Abstract

The pinch valve of the present application comprises a valve body, a lever, a reversing seat, an electromagnetic valve body and a pinch mechanism; the valve body comprises a first valve part and a second valve part which are in communication with each other, and the second valve part is provided with a slot for the soft tube to pass through; the lever is rotatably installed in the valve body and comprises a long rod part and a short rod part; the reversing seat is installed in the first valve part in a liftable manner and is in driving connection with the long rod part; the electromagnetic valve body comprises a movable iron core which is in driving connection with the reversing seat and is used to control the lifting of the reversing seat; the pinch mechanism is installed on the second valve part and comprises a first pinch member and a second pinch member which are oppositely arranged, the first pinch member is in driving connection with the short rod part and can move towards the second pinch member under the driving of the short rod part to control the opening / closing of the soft tube; and the transmission arm of the long rod part is smaller than that of the short rod part. In this way, the driving force required for the operation of the pinch valve can be reduced and the moving stroke of the movable iron core can be reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of solenoid valves, and in particular relates to a clamp valve. Background Technology

[0002] A pinch valve is a type of valve that controls fluid flow by mechanically squeezing a flexible hose (such as food-grade silicone tubing or fluororubber tubing) using an external drive. Its structure offers significant advantages, including no valve cavity residue, no contact between the fluid and the valve body, and ease of thorough cleaning, making it particularly suitable for applications with extremely high hygiene requirements. For these reasons, pinch valves have become an ideal fluid control solution in the production and transportation processes of food and beverages such as wine and beer.

[0003] Currently, most existing pinch valves employ a direct-acting structure, where the fixed iron core is directly connected to the clamping component used to squeeze the hose. This means the driving force required for the clamping component's movement is entirely provided by the moving iron core, and the clamping component's stroke is exactly the same as the moving iron core's. This structure necessitates a large electromagnetic force during valve opening and closing, limiting the applicability of existing pinch valves to small-diameter, low-pressure applications. Furthermore, the high power of the pinch valve's coil leads to significant heat generation during prolonged operation. More seriously, the substantial heat generated by the coil is conducted through the moving iron core to the clamping component and the clamped hose, causing the liquid flowing through the hose to heat up and consequently affecting its original quality characteristics such as taste and aroma. Utility Model Content

[0004] In view of this, it is necessary to provide a pinch valve for solving the above-mentioned technical problems.

[0005] A pinch valve, comprising:

[0006] The valve body includes a first valve section and a second valve section, which are connected. The second valve section has a slot for a hose to pass through.

[0007] A lever is rotatably mounted in the valve body. The lever includes a long rod portion and a short rod portion, the long rod portion extending into the first valve portion and the short rod portion extending into the second valve portion.

[0008] The reversing seat is vertically mounted inside the first valve section and is connected to the long rod section in a driving manner;

[0009] The solenoid valve body is mounted on the first valve section. The solenoid valve body includes a movable iron core, which is connected to the reversing seat for controlling the lifting and lowering of the reversing seat.

[0010] A clamping mechanism is installed on the second valve section. The clamping mechanism includes a first clamping member and a second clamping member arranged opposite to each other. The first clamping member is throttledly connected to the short rod section, and the first clamping member can move toward the second clamping member under the drive of the short rod section to clamp the part of the hose located in the slot, so as to control the opening / closing of the hose.

[0011] The power transmission arm of the long rod is set as L1, and the power transmission arm of the short rod is set as L2, wherein L1 > L2.

[0012] Understandably, employing a lever principle to transmit power between the movable iron core and the first clamping component significantly reduces the driving force required for the clamp valve to operate and decreases the actual travel of the movable iron core. This allows the clamp valve to not only output a larger clamping force during operation, making it suitable for applications involving large-diameter, high-pressure fluids, but also effectively reduces the heat generated during operation. Simultaneously, the lever design extends the path of heat transfer from the movable iron core to the hose, reducing heat conduction efficiency and thus preventing heating of the product flowing through the hose, ensuring that the original quality characteristics of the product remain unaffected.

[0013] In one embodiment, a first cylindrical pin passes through the long rod portion, and the two ends of the first cylindrical pin extending out of the long rod portion are inserted into the reversing seat; and the reversing seat is provided with a first arc surface, and the reversing seat can push against the long rod portion through the first arc surface.

[0014] And / or, a second cylindrical pin passes through the short rod portion, and the two ends of the second cylindrical pin extending out of the short rod portion are inserted into the first clamping pipe fitting; and, the short rod portion is provided with a second arc surface, and the short rod portion can push against the first clamping pipe fitting through the second arc surface.

[0015] In one embodiment, the clamp valve further includes an elastic element disposed between the second clamp and the second valve portion in a pre-compressed manner, for providing the second clamp with an elastic force that moves toward the first clamp.

[0016] It is understandable that the elastic element pushes the second clamping component, enabling the second clamping component and the first clamping component to be used to clamp hoses of different diameters, thereby further improving the compatibility of the clamping valve.

[0017] In one embodiment, the second clamping member is provided with an extension protrusion that extends out of the second valve portion in a direction away from the first clamping member;

[0018] The clamp valve further includes a pull pin wrench, which is rotatably mounted on the extension rod at the portion extending out of the second valve part and abuts against and limits the second valve part.

[0019] It is understandable that the installation position of the second clamp fitting on the second valve section is manually controlled by using a pull pin wrench, which facilitates the subsequent replacement of the hose on the clamp valve.

[0020] In one embodiment, a first pin is provided on the second valve section. The first pin passes through the first clamping member and is slidably connected to the first clamping member to guide the movement of the first clamping member within the second valve section.

[0021] And / or, the second valve section is provided with a second pin, the second pin passing through the second clamping member and slidingly connected to the second clamping member, for guiding the second clamping member to adjust its position within the second valve section.

[0022] It is understandable that the movement of the first or second clamping fitting is guided by the first and / or second clamping pins, which ensures the consistency of the movement direction of the first and second clamping fittings, thereby ensuring the reliability of the clamping valve.

[0023] In one embodiment, the valve body further includes a connecting valve portion, which is disposed between the first valve portion and the second valve portion, and is connected to and communicates with the first valve portion and the second valve portion respectively;

[0024] The lever is disposed through the connecting valve section and is rotatably connected to the connecting valve section.

[0025] In one embodiment, the valve body is made of plastic.

[0026] Understandably, the low thermal conductivity of plastics can be used to further reduce the heat transfer efficiency of pinch valves.

[0027] In one embodiment, the reversing seat is threadedly connected to the movable iron core.

[0028] Understandably, the screw connection between the commutator and the movable iron core facilitates the assembly and connection between them.

[0029] In one embodiment, the solenoid valve body further includes a magnetic shielding tube, a fixed iron core, and an iron core spring, wherein the magnetic shielding tube extends into the first valve section and is connected to the first valve section.

[0030] The fixed iron core is at least partially installed inside the magnetic shielding tube, and the movable iron core extends into the magnetic shielding tube and is positioned opposite to the fixed iron core. The iron core spring is fitted onto the portion of the movable iron core that extends out of the magnetic shielding tube and abuts against and limits the magnetic shielding tube and the reversing seat, respectively.

[0031] Understandably, placing the iron core spring between the magnetic shielding tube and the reversing seat eliminates the need for separate space for the assembly of the iron core spring, which is beneficial for miniaturizing the overall structure of the clamp valve.

[0032] In one embodiment, the magnetic shielding tube portion is inserted into the first valve section and screwed onto the first valve section.

[0033] It is understandable that the screw connection between the magnetic shielding tube and the first valve part can facilitate the assembly and connection between the magnetic shielding tube and the first valve part.

[0034] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0035] The pinch valve claimed in this application uses a lever principle to transmit power between the movable iron core and the first clamping component. This significantly reduces the driving force required for the valve's operation and decreases the actual travel of the movable iron core. This allows the pinch valve to output a larger clamping force during operation, making it suitable for applications involving large-diameter, high-pressure fluids. Furthermore, it effectively reduces heat generation during operation. Simultaneously, the lever design extends the path of heat transfer from the movable iron core to the hose, reducing heat conduction efficiency and preventing heating of the product flowing through the hose, thus ensuring that the product's original quality characteristics remain unaffected. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the pinch valve provided in this application.

[0038] Figure 2 This is a structural schematic diagram of the pinch valve provided in this application from another perspective.

[0039] Figure 3 This is a cross-sectional view of the pinch valve provided in this application.

[0040] Figure 4 This is an exploded view of the pinch valve provided in this application.

[0041] Reference numerals: 100, clamp valve; 10, valve body; 11, first valve section; 12, second valve section; 121, slot; 13, connecting valve section; 20, lever; 21, long rod section; 22, short rod section; 221, second arc surface; 30, reversing seat; 31, first arc surface; 32, stud; 40, solenoid valve body; 41, movable iron core; 42, magnetic shielding tube; 43, fixed iron core; 44, iron core spring; 45, coil; 50, clamp mechanism; 51, first clamp component; 52, second clamp component; 521, extension protrusion; 53, elastic element; 54, pull pin wrench; 101, first cylindrical pin; 102, second cylindrical pin; 103, third cylindrical pin; 110, first pin; 120, second pin; 200, hose. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] It should be noted that when a component is said to be "located on" another component, it can be directly located on the other component or may have an intervening component. When a component is considered to be "located on" another component, it can be directly located on the other component or may have an intervening component. When a component is considered to be "fixed to" another component, it can be directly fixed to the other component or may have an intervening component.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0045] like Figures 1 to 4As shown, the clamp valve 100 provided in this application includes a valve body 10, a lever 20, a reversing seat 30, a solenoid valve body 40, and a clamping mechanism 50. The valve body 10 includes a first valve section 11 and a second valve section 12, which are connected. The second valve section 12 has a slot 121 for a hose 200 to pass through. The lever 20 is rotatably mounted in the valve body 10 and includes a long rod section 21 and a short rod section 22. The long rod section 21 extends into the first valve section 11, and the short rod section 22 extends into the second valve section 12. The reversing seat 30 is vertically mounted in the first valve section 11 and is connected to the long rod section 21. The solenoid valve body 40 is mounted on... On the first valve section 11, the solenoid valve body 40 includes a movable iron core 41, which is operatively connected to the reversing seat 30 for controlling the lifting and lowering of the reversing seat 30. A clamping mechanism 50 is mounted on the second valve section 12. The clamping mechanism 50 includes a first clamping member 51 and a second clamping member 52 arranged opposite to each other. The first clamping member 51 is operatively connected to the short rod section 22, and can move towards the second clamping member 52 under the drive of the short rod section 22 to clamp the portion of the hose 200 located within the slot 121, thereby controlling the opening / closing of the hose 200. Furthermore, the transmission arm of the long rod section 21 is set to L1, and the transmission arm of the short rod section is set to L2, where L1 > L2. Here, the product transported within the hose 200 can specifically be food and beverages such as wine or beer.

[0046] As can be seen from the above, the clamp valve 100 of this application uses the lever principle to transmit the power between the movable iron core 41 and the first clamping member 51, which can significantly reduce the driving force required for the operation of the clamp valve 100 and reduce the actual travel of the movable iron core 41. This allows the clamp valve 100 to output a larger clamping force during operation, making it suitable for applications involving large-diameter, high-pressure fluids. It also effectively reduces the heat generated during operation. At the same time, the design of the lever 20 can extend the path of heat transfer from the movable iron core 41 to the hose 200, reducing heat conduction efficiency and thus avoiding heating of the product flowing through the hose 200, ensuring that the original quality characteristics of the product are not affected.

[0047] like Figure 1 , Figure 3 and Figure 4As shown, in one embodiment, a first pin 110 is provided on the second valve portion 12. The first pin 110 passes through the first clamping member 51 and is slidably connected to the first clamping member 51 to guide the movement of the first clamping member 51 within the second valve portion 12. That is, in this embodiment, the first clamping member 51 can move under the guidance of the first pin 110, thereby ensuring the consistency of the direction of movement of the first clamping member 51 and contributing to the reliability of the clamp valve 100. It is understood that in other embodiments, the first clamping member 51 can also be directly slidably engaged with the second valve portion 12, which will not be elaborated upon here.

[0048] like Figure 1 , Figure 3 and Figure 4 As shown, in one embodiment, a second pin 120 is provided on the second valve portion 12. The second pin 120 passes through the second clamping member 52 and is slidably connected to the second clamping member 52, used to guide the position adjustment of the second clamping member 52 within the second valve portion 12. That is, in this embodiment, the first clamping member 51 can be positioned under the guidance of the second pin 120, thereby ensuring the consistency of the direction of movement of the second clamping member 52, which is beneficial to ensuring the reliability of the clamping valve 100. It is understood that in other embodiments, the second clamping member 52 as a whole can also be directly slidably engaged with the second valve portion 12, which will not be elaborated here.

[0049] like Figures 1 to 4 As shown, in one embodiment, the valve body 10 further includes a connecting valve portion 13, which is disposed between the first valve portion 11 and the second valve portion 12, and is connected and communicated with the first valve portion 11 and the second valve portion 12 respectively; wherein, the lever 20 is disposed through the connecting valve portion 13 and is rotatably connected to the connecting valve portion 13, and the rotatable connection between the lever 20 and the connecting valve portion 13 can be achieved by the third cylindrical pin 103.

[0050] Here, the first valve part 11, the connecting valve part 13, and the second valve part 12 are connected as one unit. Specifically, the valve body 10 can be made of plastic, so that the pinch valve 100 can be made of a material with low thermal conductivity, which can further reduce the heat conduction efficiency of the pinch valve 100 during operation, and ensure that the heat generated by the pinch valve 100 during operation will not be transferred to the hose 200, thus preventing any impact on the quality of the products transmitted in the hose 200.

[0051] like Figure 3 , Figure 4As shown, in one embodiment, a first cylindrical pin 101 passes through the long rod portion 21, and the two ends of the first cylindrical pin 101 extending out of the long rod portion 21 are inserted into the reversing seat 30. Furthermore, the reversing seat 30 is provided with a first arc surface 31, and the reversing seat 30 can push against the long rod portion 21 through the first arc surface 31, thereby achieving the assembly connection between the long rod portion 21 and the reversing seat 30. This allows the reversing seat 30 to press down on the long rod portion 21 through the first arc surface 31 and lift the long rod portion 21 through the first cylindrical pin 101, thus simplifying the connection structure between the long rod portion 21 and the reversing seat 30. It is understood that in other embodiments, a hinge can also be used for the transmission connection between the long rod portion 21 and the reversing seat 30, which will not be elaborated upon here.

[0052] like Figure 3 , Figure 4 As shown, in one embodiment, a second cylindrical pin 102 passes through the short rod portion 22, and the two ends of the second cylindrical pin 102 extending out of the short rod portion 22 are inserted into the first clamping tube 51. Furthermore, the short rod portion 22 is provided with a second arc surface 221, and the short rod portion 22 can push against the first clamping tube 51 through the second arc surface 221, thereby achieving the assembly connection between the short rod portion 22 and the first clamping tube 51. This allows the short rod portion 22 to push upwards against the first clamping tube 51 through the second arc surface 221, simplifying the connection structure between the long rod portion 21 and the reversing seat 30. It is understood that in other embodiments, the short rod portion 22 and the first clamping tube 51 can also be connected by a hinge, which will not be elaborated upon here.

[0053] like Figure 3 , Figure 4 As shown, in one embodiment, the reversing seat 30 is connected to the movable iron core 41 by a thread, thereby realizing the assembly connection between the reversing seat 30 and the movable iron core 41 and facilitating the assembly connection between the reversing seat 30 and the movable iron core 41.

[0054] Here, as Figure 3 As shown, a protruding stud 32 is formed on the commutator 30, which can extend into the movable iron core 41 and be screwed to the movable iron core 41. It can be understood that in other embodiments, the stud may also be provided on the movable iron core, or the commutator 30 and the movable iron core 41 may be threaded together as a whole.

[0055] like Figure 3 , Figure 4As shown, in one embodiment, the solenoid valve body 40 further includes a magnetic shielding tube 42, a fixed iron core 43, and an iron core spring 44. The magnetic shielding tube 42 extends into and connects to the first valve section 11. The fixed iron core 43 is at least partially installed inside the magnetic shielding tube 42, and the movable iron core 41 extends into the magnetic shielding tube 42 and is positioned opposite to the fixed iron core 43. The iron core spring 44 is fitted onto the portion of the movable iron core 41 that extends out of the magnetic shielding tube 42, and abuts against and limits the magnetic shielding tube 42 and the reversing seat 30, respectively. Obviously, the assembly of the iron core spring 44 does not require separate space, which is beneficial to the miniaturization of the overall structure of the pinch valve 100. Of course, in this embodiment, a coil 45 is fitted onto the magnetic shielding tube 42, and the opening / closing of the pinch valve 100 is controlled by the on / off state of the coil 45.

[0056] Here, the magnetic shielding tube 42 is partially inserted into the first valve section 11 and screwed onto the first valve section 11, which facilitates the assembly of the magnetic shielding tube 42 onto the first valve section 11. It is understood that in other embodiments, the magnetic shielding tube 42 and the first valve section 11 may also be connected by a tight fit or adhesive bonding, which will not be elaborated here.

[0057] like Figure 3 , Figure 4 As shown, in one embodiment, the clamp valve 100 further includes an elastic element 53. The elastic element 53 is pre-compressed and disposed between the second clamp 52 and the second valve portion 12 to provide an elastic force to the second clamp 52 to move toward the first clamp 51. That is, the clamp valve 100 of this embodiment can use the elastic element 53 to elastically push the second clamp 52, so that the second clamp 52 and the first clamp 51 can be used to clamp hoses of different diameters, thereby further improving the adaptability of the clamp valve 100. Of course, the aforementioned elastic element 53 can specifically be a compression spring, a rubber sleeve, or other highly elastic accessories, which will not be elaborated here.

[0058] Here, as Figure 3 As shown, the second clamping fitting 52 is provided with an extension protrusion 521, which extends out of the second valve portion 12 in a direction away from the first clamping fitting 51. The clamping valve 100 also includes a pull pin wrench 54, which is rotatably mounted on the part of the extension protrusion 521 that extends out of the second valve portion 12 and abuts against and limits the second valve portion 12. This allows the operator to press the pull pin wrench 54, using the action and reaction forces between the pull pin wrench 54 and the second valve portion 12 to drive the second clamping fitting 52 to compress the elastic element 53, thereby releasing the clamping of the hose 200 by the first clamping fitting 51 and the second clamping fitting 52, and achieving the purpose of manually replacing the hose 200. Obviously, the above-mentioned method of replacing the hose 200 is simple and convenient to operate.

[0059] As can be seen from the above, during the operation of the clamp valve 100 of this application, when the coil 45 is de-energized, the iron core spring 44 applies downward pressure to the long rod 21 of the lever 20. Through the transmission action of the lever 20, the short rod 22 pushes the first clamp 51 upward, so that it and the second clamp 52 together squeeze the hose 200 to close the hose 200 and prevent the product in the hose 200 from flowing out. When the coil 45 is energized, the electromagnetic force generated by the energized coil 45 will drive the movable iron core 41 to pull the long rod 21 of the lever 20 upward. At this time, the short rod 22 of the lever 20 moves downward, causing the first clamp 51 to loosen the hose 200, so that the product in the hose 200 can flow out smoothly.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Any appropriate changes and variations made to the above embodiments within the scope of the essential spirit of the present utility model shall fall within the scope of protection claimed by the present utility model.

Claims

1. A pinch valve, characterized in that, The pinch valve (100) includes: The valve body (10) includes a first valve part (11) and a second valve part (12), the first valve part (11) and the second valve part (12) are connected, wherein the second valve part (12) is provided with a slot (121) for the hose (200) to pass through; A lever (20) is rotatably mounted inside the valve body (10). The lever (20) includes a long rod portion (21) and a short rod portion (22). The long rod portion (21) extends into the first valve portion (11), and the short rod portion (22) extends into the second valve portion (12). The reversing seat (30) is vertically mounted inside the first valve section (11) and is connected to the long rod section (21) in a transmission manner; The solenoid valve body (40) is installed on the first valve part (11). The solenoid valve body (40) includes a movable iron core (41). The movable iron core (41) is connected to the reversing seat (30) for controlling the lifting and lowering of the reversing seat (30). A clamping mechanism (50) is installed on the second valve part (12). The clamping mechanism (50) includes a first clamping member (51) and a second clamping member (52) arranged opposite to each other. The first clamping member (51) is convexly connected to the short rod part (22), and the first clamping member (51) can move toward the second clamping member (52) under the drive of the short rod part (22) to clamp the part of the hose (200) located in the slot (121) to control the opening / closing of the hose (200). The power transmission arm of the long rod (21) is set as L1, and the power transmission arm of the short rod (22) is set as L2, wherein L1 > L2.

2. The pinch valve according to claim 1, characterized in that, A first cylindrical pin (101) passes through the long rod (21), and the two ends of the first cylindrical pin (101) extending out of the long rod (21) are inserted into the reversing seat (30); and the reversing seat (30) is provided with a first arc surface (31), and the reversing seat (30) can push against the long rod (21) through the first arc surface (31). And / or, a second cylindrical pin (102) is passed through the short rod portion (22), and the two ends of the second cylindrical pin (102) extending out of the short rod portion (22) are inserted into the first clamping tube (51); and, a second arc surface (221) is provided on the short rod portion (22), and the short rod portion (22) can push against the first clamping tube (51) through the second arc surface (221).

3. The pinch valve according to claim 1, characterized in that, The clamp valve (100) further includes an elastic element (53), which is pre-compressed between the second clamp (52) and the second valve (12) to provide the second clamp (52) with an elastic force that moves toward the first clamp (51).

4. The pinch valve according to claim 3, characterized in that, The second clamping fitting (52) is provided with an extension protrusion (521), which extends out of the second valve part (12) in a direction away from the first clamping fitting (51); The clamp valve (100) further includes a pull pin wrench (54), which is rotatably mounted on the extension protrusion (521) at the part extending out of the second valve part (12) and abuts against and limits the second valve part (12).

5. The pinch valve according to claim 1, characterized in that, The second valve part (12) is provided with a first pin (110), which passes through the first clamp (51) and is slidably connected to the first clamp (51) to guide the movement of the first clamp (51) within the second valve part (12); And / or, the second valve part (12) is provided with a second pin (120), the second pin (120) is provided through the second clamping member (52) and is slidably connected to the second clamping member (52) for guiding the second clamping member (52) to adjust its position within the second valve part (12).

6. The pinch valve according to claim 1, characterized in that, The valve body (10) further includes a connecting valve part (13), which is located between the first valve part (11) and the second valve part (12), and is connected and communicates with the first valve part (11) and the second valve part (12) respectively; The lever (20) is disposed through the connecting valve part (13) and is rotatably connected to the connecting valve part (13).

7. The pinch valve according to claim 1, characterized in that, The valve body (10) is made of plastic.

8. The pinch valve according to claim 1, characterized in that, The reversing seat (30) is threaded to the movable iron core (41).

9. The pinch valve according to claim 1, characterized in that, The solenoid valve body (40) also includes a magnetic shielding tube (42), a fixed iron core (43) and an iron core spring (44). The magnetic shielding tube (42) extends into the first valve part (11) and is connected to the first valve part (11). The fixed iron core (43) is at least partially installed inside the magnetic shielding tube (42), the movable iron core (41) extends into the magnetic shielding tube (42) and is positioned opposite to the fixed iron core (43), and the iron core spring (44) is fitted on the portion of the movable iron core (41) that extends out of the magnetic shielding tube (42) and abuts against and limits the magnetic shielding tube (42) and the reversing seat (30) respectively.

10. The pinch valve according to claim 9, characterized in that, The magnetic shielding tube (42) is partially inserted into the first valve section (11) and screwed into the first valve section (11).

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