Split type electromagnetic valve

Abstract

The application discloses a split electromagnetic valve and belongs to the technical field of electromagnetic valves. The split electromagnetic valve comprises a driving coil assembly and a valve body assembly. The driving coil assembly comprises a shell, a driving coil, a magnetic conducting cover and a second magnetic coupling member. The shell is internally provided with a first cavity and a second cavity. The driving coil is wound and arranged in the second cavity. The magnetic conducting cover is arranged in the first cavity. The second magnetic coupling member is arranged at the end of the magnetic conducting cover. The valve body assembly comprises a valve body, a valve seat, a locking nut, a moving iron core, a first magnetic coupling member and a valve core return spring. The valve body is internally provided with a matching channel and a fluid channel. The valve seat is fixed at one end of the matching channel. The locking nut is fixed at the other end of the matching channel. The valve body and the driving coil are independent units. Through heat insulation design, the problem that the electromagnetic valve cannot normally work under extreme temperature medium can be solved. The driving coil is electromagnetically shielded, and the problem of electromagnetic interference is effectively solved. The valve body and the driving coil can be quickly replaced and separately maintained.

Description

Technical Field

[0001] This application relates to the field of solenoid valve technology, and in particular to a split-type solenoid valve. Background Technology

[0002] Solenoid valves are fundamental components that use electromagnetic force to control the automatic switching of fluid pathways. They are widely used in industrial automation, medical devices, home appliances, and aerospace.

[0003] The working principle of a traditional solenoid valve is as follows: when energized, the electromagnetic force generated by the solenoid coil lifts the valve core from the valve seat, opening the valve; when de-energized, the electromagnetic force disappears, and the compression spring presses the valve core back onto the valve seat, closing the valve. This type of solenoid valve has the advantage of fast response speed and is suitable for applications with high frequency of use and requiring rapid closure. Traditional solenoid valves typically connect the coil and valve body via cables and connectors. However, due to this connection method, the cables and connectors are susceptible to the effects of the medium flowing through the valve body during long-term use. Furthermore, existing solenoid valves are prone to electromagnetic interference, making maintenance relatively difficult. Summary of the Invention

[0004] The main objective of this application is to provide a split-type solenoid valve, which aims to solve the problems of existing solenoid valves where the connection between the coil and the valve body via cables and connectors is susceptible to the influence of medium temperature, electromagnetic interference, and maintenance difficulties.

[0005] To achieve the above objectives, this application provides a split-type solenoid valve, comprising: a drive coil assembly and a valve body assembly. The drive coil assembly includes: a housing, a drive coil, a magnetic shield, and a second magnetic coupling element. The housing contains a first cavity and a second cavity, the second cavity surrounding the outer periphery of the first cavity. The drive coil is wound within the second cavity. The magnetic shield is disposed within the first cavity and is used to cooperate with the drive coil to generate magnetic force when the drive coil is energized. The second magnetic coupling element is disposed at the end of the magnetic shield and is used to transmit the magnetic force generated by the magnetic shield. The valve body assembly includes: a valve body, a valve seat, a locking nut, a moving iron core, a first magnetic coupling element, and a valve core return spring. The valve body contains a mating channel and a fluid channel, the fluid channel communicating with the mating channel. The valve seat is fixed... A valve seat is fixed at one end of the mating channel, and a through fluid inlet channel is provided on the valve seat, which communicates with the mating channel. A locking nut is fixed at the other end of the mating channel, and a through mating hole is provided on the locking nut along the axial direction of the mating channel, which is opposite to the second magnetic coupling member. A moving iron core is movably disposed within the mating channel, with one end of the moving iron core near the mating hole moving and mating within the mating hole. A blind hole is provided at the end of the moving iron core near the mating hole. When the moving iron core moves to contact the valve seat, there is a gap between the moving iron core and the second magnetic coupling member. The first magnetic coupling member is disposed within the blind hole and is used to connect with the second magnetic coupling member through magnetic force. A valve core return spring is disposed between the moving iron core and the locking nut and is used to drive the moving iron core to return to its original position.

[0006] Optionally, the drive coil assembly further includes an electrical connector, wherein the electrical connector is disposed on one side of the housing and connected to a power source, the power source being used to provide current to the drive coil.

[0007] Optionally, a guide post is further provided in the first cavity of the housing, and a return spring is provided on the outer periphery of the guide post. The magnetic shield is movably disposed on the guide post, and the return spring abuts against the magnetic shield.

[0008] Optionally, a first sealing ring and a second sealing ring are provided between the housing and the valve body.

[0009] Optionally, a third sealing ring is provided between the valve seat and the valve body.

[0010] Optionally, a fourth sealing ring is provided between the moving iron core and the locking nut.

[0011] Optionally, a sealing gasket is provided on the surface of the moving iron core that contacts the fluid inlet channel.

[0012] Optionally, a vent is provided at one end of the housing away from the valve body assembly. The vent is used to discharge excess gas inside the housing, and a dust cover is provided at the outlet of the vent.

[0013] Optionally, the valve body assembly further includes a stationary iron core, wherein the stationary iron core is fixedly disposed within the mating channel, and the moving iron core is movably disposed within the stationary iron core.

[0014] Optionally, the housing is made of plastic, and the valve body is made of metal.

[0015] This application discloses a split-type solenoid valve. When the drive coil is de-energized, the moving iron core is positioned close to the valve seat under the force of the valve core return spring. At this time, the fluid inlet channel and the fluid channel are closed, preventing fluid from passing through. When the drive coil is energized, the drive coil and the magnetic shield generate magnetic force. This magnetic force is transmitted to the moving iron core through the second and first magnetic coupling elements, causing the moving iron core to overcome the force of the valve core return spring and move away from the valve seat. When the moving iron core contacts the second magnetic coupling element, the valve opens, and fluid flows into the fluid channel from the fluid inlet channel. The solenoid valve in this application no longer uses cables and connectors to connect the coil and valve body; instead, it adopts a split design. This ensures the solenoid valve's switching function while preventing it from being affected by medium temperature. Furthermore, there is no electrical connection between the valve body assembly and the drive coil assembly. Separating the valve body assembly and the drive coil assembly allows for the addition of ceramic gaskets for heat insulation and sealing for magnetic shielding, thus providing electromagnetic shielding and enhancing the system's anti-interference capability and making the control signal more stable and reliable. In addition, as an independent standardized module, the drive coil assembly can be replaced simply when damaged, without the need to disassemble or replace the valve body assembly on the pipeline, which greatly reduces maintenance costs and time.

[0016] The present application proposes a split-type solenoid valve that is driven non-contactly by magnetic force. The valve body assembly has no electrical connections or components that may generate electric sparks and does not constitute an ignition source. The drive coil can be installed in a safe area as an unsafe device and driven non-contactly by spatial magnetic force. This fundamentally avoids the risk of electric sparks generated by the coil of a traditional solenoid valve in a dangerous area, and simplifies explosion-proof design and equipment cost.

[0017] The present application provides a split-type solenoid valve in which a single drive coil assembly can be paired with valve body assemblies of different specifications and functions, thereby improving the modularity and flexibility of the system. Attached Figure Description

[0018] To more clearly illustrate the prior art and the present invention, the accompanying drawings used in the description of the prior art and the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other drawings from the provided drawings without any creative effort.

[0019] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should fall within the scope of the technical content disclosed herein.

[0020] Figure 1 A cross-sectional view of a split-type solenoid valve in its normally closed state when de-energized, as provided in an embodiment of this application;

[0021] Figure 2 This is a cross-sectional view of the energized drive coil of a split-type solenoid valve provided in an embodiment of this application.

[0022] In the figure, 100 is the drive coil assembly; 101 is the housing; 102 is the drive coil; 103 is the magnetic shield; 104 is the second magnetic coupling element; 105 is the return spring; 106 is the dust cover; 107 is the electrical connector; 200 is the valve body assembly; 201 is the valve body; 202 is the valve seat; 203 is the moving iron core; 204 is the stationary iron core; 205 is the first magnetic coupling element; 206 is the valve core return spring; 207 is the first sealing ring; 208 is the fluid channel; 209 is the second sealing ring; 210 is the locking nut; 211 is the third sealing ring; and 212 is the fourth sealing ring.

[0023] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0028] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] Figure 1 A cross-sectional view of a split-type solenoid valve in its normally closed state when de-energized, as provided in an embodiment of this application; Figure 2 This is a cross-sectional view of the energized drive coil of a split-type solenoid valve provided in an embodiment of this application.

[0030] Please see Figure 1 , Figure 2This application provides a split-type solenoid valve, which may include a drive coil assembly 100 and a valve body assembly 200. The drive coil assembly 100 may include a housing 101, a drive coil 102, a magnetic shield 103, and a second magnetic coupling member 104. The housing 101 has a first cavity and a second cavity, with the second cavity surrounding the outer periphery of the first cavity. The drive coil 102 is wound within the second cavity. The magnetic shield 103 is disposed within the first cavity and cooperates with the drive coil 102 to generate magnetic force when the drive coil 102 is energized. The second magnetic coupling member 104 is disposed at the end of the magnetic shield 103 and transmits the magnetic force generated by the magnetic shield 103. The valve body assembly 200 may include a valve body 201, a valve seat 202, a locking nut 210, a moving iron core 203, a first magnetic coupling member 205, and a valve core return spring 206. The valve body 201 has a mating channel and... A fluid channel 208 is connected to a mating channel; a valve seat 202 is fixed to one end of the mating channel, and a through fluid inlet channel is provided on the valve seat 202, which is connected to the mating channel; a locking nut 210 is fixed to the other end of the mating channel, and a through mating hole is provided on the locking nut 210 along the axial direction of the mating channel, the mating hole being opposite to the second magnetic coupling member 104; a moving iron core 203 is movably disposed within the mating channel, with one end of the moving iron core 203 near the mating hole moving and mating within the mating hole, and a blind hole is provided at the end of the moving iron core 203 near the mating hole, so that when the moving iron core 203 moves to contact the valve seat 202, there is a gap between the moving iron core 203 and the second magnetic coupling member 104; a first magnetic coupling member 205 is disposed within the blind hole for magnetic connection with the second magnetic coupling member 104; a valve core return spring 206 is disposed between the moving iron core 203 and the locking nut 210 for driving the moving iron core 203 to return to its original position.

[0031] In this embodiment, when the drive coil 102 is de-energized, the moving iron core 203 is positioned close to the valve seat 202 under the elastic force of the valve core return spring 206. At this time, the fluid inlet channel and the fluid channel 208 are closed, and the fluid cannot pass through smoothly. When the drive coil 102 is energized, the drive coil 102 and the magnetic shield 103 cooperate to generate a magnetic force. This magnetic force is transmitted to the moving iron core 203 through the second magnetic coupling member 104 and the first magnetic coupling member 205, causing the moving iron core 203 to overcome the elastic force of the valve core return spring 206 and move away from the valve seat 202. When the moving iron core 203 moves to contact the second magnetic coupling member 104, the valve opens, and the fluid flows from the fluid inlet channel into the fluid channel 208. The solenoid valve involved in this application no longer connects the coil and the valve body through cables and connectors, but adopts a separate design, which ensures the solenoid valve's switching function while not being affected by the medium temperature, etc. Furthermore, there is no electrical connection between the valve body assembly 200 and the drive coil assembly 100. The valve body assembly 200 and the drive coil assembly 100 can be separated and insulated with ceramic gaskets and sealed for magnetic shielding, thus providing electromagnetic shielding. This enhances the system's anti-interference capability and makes the control signal more stable and reliable. In addition, as an independent standardized module, the drive coil assembly 100 only needs to be replaced if damaged; there is no need to disassemble or replace the valve body assembly 200 on the pipeline, significantly reducing maintenance costs and time.

[0032] For example, the drive coil assembly 100 and the valve body assembly 200 can be connected by a threaded connection. The second magnetic coupling member 104 and the first magnetic coupling member 205 can both be permanent magnets, and the magnetic poles of the opposite surfaces of the second magnetic coupling member 104 and the first magnetic coupling member 205 are opposite.

[0033] Please see Figure 1 , Figure 2 In some possible implementations, the drive coil assembly 100 may further include an electrical connector 107, wherein the electrical connector 107 is disposed on one side of the housing 101 and connected to a power source, the power source being used to provide current to the drive coil 102.

[0034] The electrical connector 107 is located on the side of the housing 101, which does not affect the overall compactness of the drive coil assembly 100 and facilitates the plugging and unplugging of the power cord.

[0035] The electrical connector 107 and the drive coil 102 can be electrically connected by a wire to ensure that the current can be stably transmitted to the drive coil 102, thereby ensuring the normal operation of the solenoid valve.

[0036] Please see Figure 1 , Figure 2In some possible implementations, a guide post is also provided in the first cavity of the housing 101, and a return spring 105 is provided on the outer periphery of the guide post. The magnetic shield 103 is movably disposed on the guide post, and the return spring 105 abuts against the magnetic shield 103.

[0037] The guide posts guide and limit the movement of the magnetic shield 103, ensuring that it does not shift or wobble during movement, thus guaranteeing stable transmission of magnetic force. Meanwhile, the return spring 105 confines the magnetic shield 103 within the housing 101, ensuring the stability of the connection between the magnetic shield 103 and the housing 101.

[0038] Please see Figure 1 , Figure 2 In some possible implementations, a first sealing ring 207 and a second sealing ring 209 are provided between the housing 101 and the valve body 201.

[0039] In this embodiment, the first sealing ring 207 and the second sealing ring 209 effectively prevent fluid leakage from the connection between the housing 101 and the valve body 201, thus improving the sealing performance of the solenoid valve. The first sealing ring 207 primarily serves as a preliminary seal, while the second sealing ring 209 further enhances the sealing effect, ensuring that the solenoid valve can operate normally under high pressure or high temperature environments without leakage.

[0040] Please see Figure 1 , Figure 2 In some possible implementations, a third sealing ring 211 is provided between the valve seat 202 and the valve body 201.

[0041] Specifically, the third sealing ring 211 can be disposed on the contact surface between the valve seat 202 and the valve body 201. It can be made of high-temperature resistant and corrosion-resistant materials to ensure good sealing performance even in harsh working environments. This effectively prevents fluid leakage at the connection between the valve seat and the valve body, improving the overall sealing performance and reliability of the solenoid valve.

[0042] Please see Figure 1 , Figure 2 In some possible implementations, a fourth sealing ring 212 is provided between the moving iron core 203 and the locking nut 210.

[0043] The fourth sealing ring 212 can be made of an elastic material to ensure good sealing and wear resistance. It is installed between the contact surfaces of the moving iron core 203 and the locking nut 210, effectively preventing fluid leakage and enhancing the sealing performance of the solenoid valve. Simultaneously, the fourth sealing ring 212 also acts as a buffer, reducing friction and wear between the moving iron core 203 and the locking nut 210 during movement, thus extending the service life of the solenoid valve.

[0044] It should be noted that when the medium flowing through the solenoid valve is liquid, a fourth sealing ring 212 can be provided between the moving iron core 203 and the locking nut 210; while when the medium flowing through the solenoid valve is gas, the fourth sealing ring 212 between the moving iron core 203 and the locking nut 210 can be removed, and a sealing spike can be provided on the side of the locking nut 210 facing the moving iron core 203, so that when the solenoid valve is de-energized, the gas can flow through the gap and be discharged to the outside, and when the solenoid valve is energized, the sealing spike on the locking nut 210 seals with the moving iron core 203 to ensure that the gas does not leak.

[0045] Furthermore, in some possible implementations, a sealing gasket is provided on the surface of the moving iron core 203 that contacts the fluid inlet channel.

[0046] In this embodiment, the sealing gasket enhances the sealing effect between the moving iron core 203 and the fluid inlet channel. The gasket tightly conforms to the contact surfaces of the moving iron core 203 and the fluid inlet channel, effectively preventing fluid leakage between them. Simultaneously, the gasket also acts as a shock absorber and buffer, reducing the impact and collision between the moving iron core 203 and the fluid inlet channel during movement, protecting the internal structure of the solenoid valve from damage and effectively extending its service life.

[0047] Please see Figure 1 , Figure 2 In some possible implementations, a vent is provided at the end of the housing 101 away from the valve body assembly 200. The vent is used to discharge excess gas inside the housing 101, and a dust cover 106 is provided at the outlet of the vent.

[0048] The vent design effectively prevents pressure fluctuations caused by gas buildup inside the housing, ensuring the stability of the solenoid valve during operation. Simultaneously, the dust cover prevents external dust and impurities from entering the housing, thus not affecting the normal operation of the solenoid valve. This design not only improves the reliability of the solenoid valve but also extends its service life.

[0049] Please see Figure 1 , Figure 2In some possible implementations, the valve body assembly 200 may further include: a stationary iron core 204, wherein the stationary iron core 204 is fixedly disposed in the mating channel, and the moving iron core 203 is movably disposed in the stationary iron core 204.

[0050] Specifically, the stationary iron core 204 precisely guides the movement of the moving iron core 203, ensuring its smooth and accurate movement within the mating channel, thereby guaranteeing the reliability and stability of the solenoid valve's switching action. Simultaneously, the mating gap between the stationary iron core 204 and the moving iron core 203 ensures smooth movement of the moving iron core 203 while effectively preventing fluid leakage through this gap, thus improving the solenoid valve's sealing performance.

[0051] Furthermore, in some possible implementations, the housing 101 is made of plastic and the valve body 201 is made of metal.

[0052] Plastic materials offer advantages such as light weight, low cost, good insulation, and strong corrosion resistance. Therefore, using plastic for the housing 101 effectively reduces the overall weight of the solenoid valve, lowers production costs, and allows it to adapt to various complex working environments. Conversely, using metal for the valve body 201 ensures sufficient strength and rigidity to withstand the impact of high-pressure and high-temperature fluids, guaranteeing stable and reliable operation of the solenoid valve even under harsh working conditions.

[0053] Working principle:

[0054] like Figure 1 As shown, when the drive coil 102 is de-energized, the elastic force of the valve core reset spring 206 pushes the moving iron core 203 downward, causing the moving iron core 203 to contact the valve seat 202, resulting in the solenoid valve closing and thus blocking the fluid inlet channel on the valve seat 202.

[0055] like Figure 2 As shown, when the drive coil 102 is energized, a magnetic field is generated. This magnetic field is guided by the magnetic shield 103, causing a magnetic force at the second magnetic coupling member 104 that is superimposed on the inherent magnetic field of the permanent magnet. This generates a strong axial attraction on the first magnetic coupling member 205. This attraction overcomes the elastic force of the valve core return spring 206 and the fluid pressure, attracting the moving iron core 203 along with the first magnetic coupling member 205 towards the second magnetic coupling member 104. This causes the solenoid valve to open, thereby connecting the fluid inlet channel on the valve seat 202 with the fluid channel 208.

[0056] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A split-type solenoid valve, comprising a drive coil assembly (100) and a valve body assembly (200), characterized in that, The drive coil assembly (100) includes: The housing (101) has a first cavity and a second cavity inside, the second cavity surrounding the outer periphery of the first cavity; The drive coil (102) is wound inside the second cavity; A magnetic shield (103) is disposed in the first cavity. The magnetic shield (103) is used to cooperate with the drive coil (102) to generate magnetic force after the drive coil (102) is energized. The second magnetic coupling element (104) is disposed at the end of the magnetic shield (103) and is used to transmit the magnetic force generated by the magnetic shield (103); The valve body assembly (200) includes: The valve body (201) is provided with a mating channel and a fluid channel (208), and the fluid channel (208) is connected to the mating channel; A valve seat (202) is fixed to one end of the mating channel. The valve seat (202) has a through fluid inlet channel, which is connected to the mating channel. A locking nut (210) is fixed to the other end of the mating channel. A through mating hole is provided on the locking nut (210) along the axial direction of the mating channel. The mating hole is opposite to the second magnetic coupling member (104). The moving iron core (203) is movably disposed within the mating channel. The end of the moving iron core (203) near the mating hole is moved and mated within the mating hole. A blind hole is provided at the end of the moving iron core (203) near the mating hole. When the moving iron core (203) moves to contact the valve seat (202), there is a gap between the moving iron core (203) and the second magnetic coupling member (104). The first magnetic coupling element (205) is disposed in the blind hole and is used to connect with the second magnetic coupling element (104) through magnetic force. A valve core reset spring (206) is disposed between the moving iron core (203) and the locking nut (210) to drive the moving iron core (203) to reset; An exhaust port is provided at one end of the housing (101) away from the valve body assembly (200). The exhaust port is used to discharge excess gas inside the housing (101). A dust cover (106) is provided at the outlet of the exhaust port. The drive coil assembly (100) and the valve body assembly (200) are connected by a threaded connection. The second magnetic coupling element (104) and the first magnetic coupling element (205) are both permanent magnets, and the magnetic poles of the surfaces of the second magnetic coupling element (104) and the first magnetic coupling element (205) are opposite.

2. The split-type solenoid valve according to claim 1, characterized in that, The drive coil assembly (100) further includes: An electrical connector (107) is disposed on one side of the housing (101) and connected to a power source for supplying current to the drive coil (102).

3. The split-type solenoid valve according to claim 1, characterized in that, A guide post is also provided in the first cavity of the housing (101), and a reset spring (105) is provided on the outer periphery of the guide post. The magnetic shield (103) is movably disposed on the guide post, and the reset spring (105) abuts against the magnetic shield (103).

4. The split-type solenoid valve according to claim 1, characterized in that, A first sealing ring (207) and a second sealing ring (209) are provided between the housing (101) and the valve body (201).

5. The split-type solenoid valve according to claim 1, characterized in that, A third sealing ring (211) is provided between the valve seat (202) and the valve body (201).

6. The split-type solenoid valve according to claim 1, characterized in that, A fourth sealing ring (212) is provided between the moving iron core (203) and the locking nut (210).

7. The split-type solenoid valve according to claim 1, characterized in that, A sealing gasket is provided on the surface of the moving iron core (203) that contacts the fluid inlet channel.

8. The split-type solenoid valve according to claim 1, characterized in that, The valve body assembly (200) also includes: The stationary iron core (204) is fixedly installed in the mating channel, and the moving iron core (203) is movably installed in the stationary iron core (204).

9. The split-type solenoid valve according to any one of claims 1 to 8, characterized in that, The housing (101) is made of plastic, and the valve body (201) is made of metal.

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