A two-stage flow synchronous regulating cock valve

Abstract

The application discloses a two-stage flow synchronous adjusting plug valve and belongs to the technical field of plug valves. The two-stage flow synchronous adjusting plug valve comprises a valve body, a valve core and a flow adjusting plate. The valve body is provided with an air inlet cavity, a primary fire channel and a secondary fire channel. The air inlet cavity is communicated with the primary fire channel and the secondary fire channel through a valve core cavity. The valve core is rotatably arranged in the valve core cavity. The communication area between the air inlet cavity and the valve core cavity is adjusted by rotating the valve core, so that the primary fire channel and the secondary fire channel are synchronously fired, synchronously turned off and synchronously adjusted in the fire amount. The flow adjusting plate is connected with the valve core and synchronously rotates with the valve core and adjusts the air inlet amount. In the process that the valve core rotates and drives the flow adjusting plate to synchronously rotate, the flow adjusting plate firstly adjusts the air inlet amount which is ready to enter the valve core cavity, and then further controls the flow entering the primary fire channel and the secondary fire channel according to the change of the communication area between the air inlet cavity and the valve core cavity, so that the flow position when the valve core rotates is increased.

Description

Technical Field

[0001] This invention belongs to the field of plug valve technology, specifically relating to a two-stage flow synchronous regulating plug valve. Background Technology

[0002] A plug valve is a type of gas valve commonly used in residential gas appliances. It is used for manual operation to control the switching of gas supply. A dual-jet plug valve has two outlet channels, allowing for simultaneous gas output. The rotation of the valve core regulates the intensity of the main and secondary flames.

[0003] Current valve cores often have small air inlets, and the valve cores themselves are small in size and have insufficient circumference, resulting in fewer flow rate settings for their rotation angle. This leads to a limited number of flame intensity adjustment settings for the main and secondary flames. In addition, grease inside the valve core can easily clog the air inlet, resulting in a high failure rate. Summary of the Invention

[0004] This invention addresses the aforementioned problems in the prior art by proposing a two-stage flow synchronous regulating plug valve that can expand the linear flow ranges of the main and secondary fires.

[0005] This invention can be achieved through the following technical solutions:

[0006] A two-stage flow synchronous regulating plug valve, comprising:

[0007] The valve body has an intake chamber, a main ignition channel, and a secondary ignition channel. The main ignition channel and the secondary ignition channel are arranged in parallel. A valve core cavity is provided between the intake chamber and the main ignition channel and the secondary ignition channel. The intake chamber is connected to the main ignition channel and the secondary ignition channel through the valve core cavity.

[0008] The valve core is rotatably installed in the valve core cavity. The rotation of the valve core adjusts the communication area between the intake cavity and the valve core cavity. As the communication area changes, the main ignition channel and the secondary ignition channel can be ignited, ignited, and the ignition volume can be adjusted synchronously.

[0009] A flow regulating plate is connected to the valve core and rotates synchronously with the valve core. During the rotation of the flow regulating plate, the air intake volume is adjusted to increase the linear flow level of the valve core.

[0010] As a further improvement of the present invention, the valve body has a first air inlet, and the air inlet chamber includes:

[0011] The solenoid valve cavity is equipped with a solenoid valve and has a solenoid valve inlet and a solenoid valve outlet. The solenoid valve is moved so that the solenoid valve inlet and the solenoid valve outlet are connected.

[0012] The rear cover cavity, the solenoid valve cavity, the rear cover cavity having a second air inlet of the valve body, the second air inlet of the valve body being connected to the air outlet of the solenoid valve;

[0013] The gas enters the valve core cavity through the first air inlet of the valve body, the air inlet of the solenoid valve, the air outlet of the solenoid valve, and the second air inlet of the valve body in sequence.

[0014] As a further improvement of the present invention, the portion of the valve core located within the valve core cavity is provided with an arc-shaped air inlet groove. During the rotation of the valve core, the communication area between the arc-shaped air inlet groove and the second air inlet of the valve body gradually changes, thereby adjusting the air intake of the main fire channel and the secondary fire channel.

[0015] As a further improvement of the present invention, the flow regulating plate is installed on one side of the valve core located in the rear cover cavity, and at least part of the flow regulating plate covers the second air inlet of the valve body. During the rotation of the flow regulating plate, the second air inlet of the valve body is gradually opened or gradually closed.

[0016] As a further improvement of the present invention, the flow regulating plate has a flow regulating port. As the flow regulating plate rotates, the conduction area between the flow regulating port and the second air inlet of the valve body changes, thereby changing the amount of air entering the valve core cavity.

[0017] As a further improvement of the present invention, the flow regulating port can be configured as a fan-shaped hole or multiple vent holes of different sizes, and the valve core can increase its flow level through the flow regulating port.

[0018] As a further improvement of the present invention, it also includes a valve stem assembly and a lever. The valve stem assembly passes through the valve core and extends into the rear cover cavity, while the lever is located in the rear cover cavity. One end of the lever abuts against the valve stem assembly and the other end extends into the bottom of the solenoid valve. By pressing the valve stem assembly inward, the lever is rotated and the solenoid valve is lifted upward. At this time, the air inlet of the solenoid valve is connected to the air outlet of the solenoid valve.

[0019] As a further improvement of the present invention, the valve stem assembly includes:

[0020] A valve stem, which is connected to the valve core, so that the valve stem can drive the valve core to rotate synchronously;

[0021] The valve needle has one end connected to the end of the valve stem and the other end passing through the valve core and extending into the rear cover cavity to abut against the lever. By pressing the valve stem inward, the valve needle can be pushed forward and the lever can be rotated to lift the solenoid valve.

[0022] As a further improvement of the present invention, the lever includes a rotating part and pressing parts and lifting parts at both ends thereon. The pressing part abuts against the valve needle, and the lifting part passes through the air outlet of the solenoid valve and extends into the bottom of the solenoid valve. When the valve needle pushes forward, the pressing part drives the rotating part to rotate and causes the lifting part to tilt upward to lift the solenoid valve.

[0023] As a further improvement of the present invention, the portion of the valve core located outside the valve core cavity is provided with a spring cavity and a slot. The spring cavity is used to install a spring for resetting the valve needle, and the slot cooperates with a pin on the valve stem.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. As the valve core rotates and drives the flow regulating plate to rotate synchronously, the flow regulating plate first adjusts the amount of air entering the valve core cavity. Then, based on the change in the connection area between the air intake cavity and the valve core cavity, it further controls the flow rate of the gas entering the main fire channel and the secondary fire channel. This increases the flow rate levels when the valve core rotates, allowing the user to more accurately adjust to the required fire level.

[0026] 2. By rotating the valve core, the communication area between the intake chamber and the valve core chamber is adjusted. As the communication area changes, the purpose of synchronous ignition, synchronous ignition shut-off, and synchronous adjustment of the ignition volume between the main ignition channel and the secondary ignition channel is achieved.

[0027] 3. The flow regulating plate has a flow regulating port, which can be set as a fan-shaped hole or multiple vent holes of different sizes. Regardless of whether the flow regulating port is set as a fan-shaped hole or multiple vent holes of different sizes, its maximum ventilation range is when the second air inlet of the valve body is fully open. Then, as the flow regulating plate rotates, the flow regulating port gradually becomes smaller, and the amount of gas entering the second air inlet of the valve body from the flow regulating port decreases accordingly. This achieves the purpose of regulating the intake air volume, thereby enabling the valve core to have more linear flow levels.

[0028] 4. The part of the valve core located inside the valve core cavity has an arc-shaped air inlet groove. During the rotation of the valve core, the communication area between the arc-shaped air inlet groove and the second air inlet of the valve body gradually changes, thereby adjusting the air intake of the main fire channel and the secondary fire channel. In addition, since the valve core contains grease for a long time, the arc-shaped air inlet groove solves the problem that grease can easily block the air inlet compared to the existing air inlet structure. It also solves the problem that the existing valve core cannot be machined into extremely small holes, and the rotation angle between the valve core and the second air inlet of the valve body is small, the interconnection cross-sectional area is large, and the air flow is not precise when the valve core rotates. This improves the stability and reliability during use.

[0029] 5. The second air inlet of the valve body, the air inlet of the main fire channel, and the air inlet of the secondary fire channel are on the same straight line. This layout allows the overall thickness of the valve body to be thinner, reducing the amount of material used and thus reducing costs.

[0030] 6. The air inlet of the valve body is located on the upper left side of the solenoid valve, which reduces the thickness of the valve body and reduces the scrap rate during processing, while also making the stove easier to install and maintain. Attached Figure Description

[0031] Figure 1 This is an exploded view of the two-stage flow synchronous regulating plug valve of the present invention and a schematic diagram of the subsequent airflow path;

[0032] Figure 2 This is a schematic diagram of the internal structure of the two-stage flow synchronous regulating plug valve of the present invention and a schematic diagram of the front airflow path;

[0033] Figure 3 This is a front view of the two-stage flow synchronous regulating plug valve of the present invention;

[0034] Figure 4 This is the invention Figure 3 A cross-sectional view along BB;

[0035] Figure 5 This is the invention Figure 3 Sectional view along CC;

[0036] Figure 6 This is a top view of the two-stage flow synchronous regulating plug valve of the present invention;

[0037] Figure 7 This is the invention Figure 6 A cross-sectional view along DD.

[0038] In the diagram, 100 represents the valve body; 110 represents the valve core cavity.

[0039] 120. Valve core; 121. Arc-shaped air inlet groove; 122. Slot; 123. Spring;

[0040] 130. Flow regulating plate; 131. Flow regulating port; 132. Sealing gasket;

[0041] 140. First air inlet of valve body; 150. Solenoid valve cavity; 151. Solenoid valve; 152. Solenoid valve air inlet; 153. Solenoid valve air outlet; 160. Rear cover cavity; 161. Second air inlet of valve body;

[0042] 170. Valve stem assembly; 171. Valve stem; 172. Valve needle; 173. Pin;

[0043] 180. Lever; 181. Rotating part; 182. Pressing part; 183. Lifting part;

[0044] 200, main fire channel; 300, secondary fire channel. Detailed Implementation

[0045] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical methods of the present invention. However, the present invention is not limited to these embodiments.

[0046] like Figure 1-7 As shown, the present invention provides a two-stage flow synchronous regulating plug valve, comprising:

[0047] The valve body 100 has an air intake chamber, a main ignition channel 200 and a secondary ignition channel 300. The main ignition channel 200 and the secondary ignition channel 300 are arranged in parallel. A valve core chamber 110 is provided between the air intake chamber and the main ignition channel 200 and the secondary ignition channel 300. The air intake chamber is connected to the main ignition channel 200 and the secondary ignition channel 300 through the valve core chamber 110.

[0048] The valve core 120 is rotatably installed in the valve core cavity 110. The rotation of the valve core 120 adjusts the communication area between the intake cavity and the valve core cavity 110. As the communication area changes, the main ignition channel 200 and the secondary ignition channel 300 can be ignited, ignited, and the ignition volume can be adjusted synchronously.

[0049] The flow regulating plate 130 is connected to the valve core 120 and rotates synchronously with the valve core 120. During the rotation of the flow regulating plate 130, the intake air volume is adjusted to increase the linear flow level of the valve core 120.

[0050] It should be noted that in the existing technology, gas usually flows into the main fire channel 200 and the secondary fire channel 300 through the air inlet of the valve core 120. Due to the small size of the valve core 120 and its insufficient circumference, there are fewer flow levels during the rotation of the valve core 120, making it difficult for the user to accurately adjust the flame to the required size.

[0051] In contrast, in this embodiment, as the valve core 120 rotates and drives the flow regulating plate 130 to rotate synchronously, the flow regulating plate 130 first adjusts the amount of air entering the valve core cavity 110. Then, based on the change in the communication area between the air intake cavity and the valve core cavity 110, it further controls the flow rate of the gas entering the main fire channel 200 and the secondary fire channel 300. This increases the flow rate levels when the valve core 120 rotates, allowing the user to more accurately adjust to the required fire intensity level.

[0052] Preferably, the valve body 100 has a first air inlet 140, and the air inlet chamber includes:

[0053] The solenoid valve cavity 150 is equipped with a solenoid valve 151 and has a solenoid valve inlet 152 and a solenoid valve outlet 153. The solenoid valve inlet 152 and the solenoid valve outlet 153 are connected by the movement of the solenoid valve 151.

[0054] The rear cover cavity 160 and the solenoid valve cavity 150 are provided. The rear cover cavity 160 has a second air inlet 161 of the valve body, which is connected to the air outlet 153 of the solenoid valve.

[0055] Specifically, the gas enters the rear cover cavity 160 through the first air inlet 140 of the valve body, the air inlet 152 of the solenoid valve, and the air outlet 153 of the solenoid valve in sequence. Then it enters the valve core cavity 110 through the second air inlet 161 of the valve body. Subsequently, the gas is diverted to the main flame channel 200 and the secondary flame channel 300 to achieve synchronous ignition.

[0056] Preferably, the portion of the valve core 120 located within the valve core cavity 110 has an arc-shaped air inlet groove 121. During the rotation of the valve core 120, the communication area between the arc-shaped air inlet groove 121 and the second air inlet 161 of the valve body gradually changes, thereby adjusting the air intake of the main fire channel 200 and the secondary fire channel 300. In addition, since the valve core 120 contains grease for a long time, the arc-shaped air inlet groove 121 solves the problem of grease easily clogging the air inlet compared to the existing air inlet structure. It also solves the problem that the existing valve core 120 cannot be machined into extremely small holes, and the small rotation angle, large interconnection area, and imprecise air flow between the valve core 120 and the second air inlet 161 of the valve body when the valve core 120 rotates improves the stability and reliability during use.

[0057] Preferably, the flow regulating plate 130 is installed on the side of the valve core 120 located in the rear cover cavity 160. At the same time, at least part of the flow regulating plate 130 covers the second air inlet 161 of the valve body. During the rotation of the flow regulating plate 130, the second air inlet 161 of the valve body is gradually opened or gradually closed. When the second air inlet 161 of the valve body is opened, the gas can enter the position of the valve core 120.

[0058] Furthermore, the flow regulating plate 130 has a flow regulating port 131. As the flow regulating plate 130 rotates, the conduction area between the flow regulating port 131 and the second air inlet 161 of the valve body changes, thereby changing the amount of air entering the valve core cavity 110.

[0059] Specifically, the flow regulating port 131 can be configured as a fan-shaped hole or multiple vent holes of different sizes. Regardless of whether the flow regulating port 131 is configured as a fan-shaped hole or multiple vent holes of different sizes, its maximum ventilation range is when the second air inlet 161 of the valve body is fully open. Then, as the flow regulating plate 130 rotates, the flow regulating port 131 gradually becomes smaller, and the amount of gas entering the second air inlet 161 of the valve body from the flow regulating port 131 decreases accordingly, thereby achieving the purpose of regulating the intake air volume.

[0060] It is worth mentioning that, through the setting of the flow regulating plate 130 and its flow regulating port 131, the amount of gas entering from the second air inlet 161 of the valve body can be controlled to be less, which ultimately results in less gas entering the main fire channel 200 and the secondary fire channel 300, thereby achieving the purpose of increasing the linear flow level of the valve core 120.

[0061] In addition, a sealing gasket 132 can be installed between the flow regulating plate 130 and the valve core 120 to ensure that the gas can only enter the second air inlet 161 of the valve body through the flow regulating port 131, thus avoiding the problem of gas leakage.

[0062] Preferably, it also includes a valve stem assembly 170 and a lever 180. The valve stem assembly 170 passes through the valve core 120 and extends into the rear cover cavity 160. At the same time, the lever 180 is located in the rear cover cavity 160. One end of the lever 180 abuts against the valve stem assembly 170 and the other end extends into the bottom of the solenoid valve 151. By pressing the valve stem assembly 170 inward, the lever 180 is rotated and the solenoid valve 151 is lifted upward. At this time, the air inlet 152 of the solenoid valve is connected to the air outlet 153 of the solenoid valve.

[0063] In other words, when in use, simply press the valve stem assembly 170 inward, and the lever 180 will push the solenoid valve 151 upward, allowing the gas to enter the valve body's second air inlet 161.

[0064] Preferably, the valve stem assembly 170 includes:

[0065] The valve stem 171 is connected to the valve core 120, so that the valve stem 171 can drive the valve core 120 to rotate synchronously.

[0066] The valve needle 172 has one end connected to the end of the valve stem 171 and the other end passing through the valve core 120 and extending into the rear cover cavity 160 to abut against the lever 180. By pressing the valve stem 171 inward, the valve needle 172 can be pushed forward and the lever 180 can be rotated to lift the solenoid valve 151.

[0067] Specifically, when the valve stem 171 is pressed, the gas enters the second air inlet 161 of the valve body from the air inlet chamber of the solenoid valve 151. At this time, by rotating the valve stem 171, the valve core 120 and the flow regulating plate 130 are driven to rotate, and the gas can smoothly enter the main fire channel 200 and the secondary fire channel 300, and achieve the purpose of simultaneous ignition of the two channels. In addition, the ignition volume of the two channels can be adjusted synchronously during the rotation of the valve core 120.

[0068] Preferably, the lever 180 includes a rotating part 181 and pressing parts 182 and lifting parts 183 at both ends thereon. The pressing part 182 abuts against the valve needle 172. The lifting part 183 passes through the air outlet of the solenoid valve 151 and extends into the bottom of the solenoid valve 151. When the valve needle 172 pushes forward, the pressing part 182 drives the rotating part 181 to rotate and causes the lifting part 183 to tilt upward to lift the solenoid valve 151.

[0069] Preferably, the portion of the valve core 120 located outside the valve core cavity 110 has a spring cavity and a slot 122. The spring cavity is used to install a spring 123 for resetting the valve needle 172. The slot 122 cooperates with the pin 173 on the valve stem 171. The pin 173 allows the valve stem 171 to drive the valve core 120 to rotate.

[0070] In summary, the specific working process of the entire plug valve is as follows:

[0071] 1. Press the valve stem 171 inward to rotate the lever 180 and push the solenoid valve 151 upward. The solenoid valve inlet 152 and the solenoid valve outlet 153 are connected. At this time, the gas entering through the valve body inlet can enter the rear cover cavity 160 through the solenoid valve inlet 152 and the solenoid valve outlet 153 in sequence.

[0072] 2. By rotating the valve stem 171, the valve core 120 and the flow regulating plate 130 are driven to rotate. The gas enters the second air inlet 161 of the valve body from the flow regulating port 131 on the flow regulating plate 130 and comes to the side of the valve core 120. At the same time, due to the rotation of the valve core 120, the valve core cavity 110 is connected to the second air inlet 161 of the valve body. At this time, the gas can enter the valve core cavity 110 and be diverted to the main fire channel 200 and the secondary fire channel 300, and the two channels can be ignited simultaneously.

[0073] In addition, in this embodiment, the second air inlet 161 of the valve body, the air inlet of the main fire channel 200, and the air inlet of the secondary fire channel 300 are on the same straight line. This layout allows the overall thickness of the valve body to be thinner, reducing the amount of material used and thus reducing costs.

[0074] In addition, the air inlet of the valve body is located on the upper left side of the solenoid valve 151, which reduces the thickness of the valve body, reduces the scrap rate during processing, and makes the stove easier to install and maintain.

[0075] The technical means disclosed in this invention are not limited to those described above, but also include technical solutions composed of any combination of the above technical features. The above are specific embodiments of this invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

[0076] 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.

[0077] Furthermore, in this invention, descriptions involving terms such as "first," "second," and "a" 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0078] 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.

[0079] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

Claims

1. A two-stage flow synchronous regulating plug valve, characterized in that, include: The valve body has an intake chamber, a main ignition channel and a secondary ignition channel, the main ignition channel and the secondary ignition channel are arranged in parallel, and a valve core cavity is provided between the intake chamber and the main ignition channel and the secondary ignition channel. The intake chamber is connected to the main ignition channel and the secondary ignition channel through the valve core cavity. The valve core is rotatably installed in the valve core cavity. The rotation of the valve core adjusts the communication area between the intake cavity and the valve core cavity. As the communication area changes, the main ignition channel and the secondary ignition channel can be ignited, ignited, and the ignition volume can be adjusted synchronously. A flow regulating plate is connected to the valve core and rotates synchronously with the valve core. During the rotation of the flow regulating plate, the air intake volume is adjusted to increase the linear flow level of the valve core. The valve body has a first air inlet, and the air inlet chamber includes: The solenoid valve cavity is equipped with a solenoid valve and has a solenoid valve inlet and a solenoid valve outlet. The solenoid valve is moved so that the solenoid valve inlet and the solenoid valve outlet are connected. The rear cover cavity, the solenoid valve cavity, the rear cover cavity having a second air inlet of the valve body, the second air inlet of the valve body being connected to the air outlet of the solenoid valve; The gas enters the valve core cavity through the first air inlet of the valve body, the air inlet of the solenoid valve, the air outlet of the solenoid valve, and the second air inlet of the valve body in sequence; The valve core has an arc-shaped air inlet groove in the part located in the valve core cavity. During the rotation of the valve core, the communication area between the arc-shaped air inlet groove and the second air inlet of the valve body gradually changes, thereby adjusting the air intake of the main fire channel and the secondary fire channel. The flow regulating plate is installed on one side of the valve core located in the rear cover cavity, and at least part of the flow regulating plate covers the second air inlet of the valve body. During the rotation of the flow regulating plate, the second air inlet of the valve body is gradually opened or gradually closed.

2. The two-stage flow synchronous regulating plug valve according to claim 1, characterized in that, The flow regulating plate has a flow regulating port. As the flow regulating plate rotates, the conduction area between the flow regulating port and the second air inlet of the valve body changes, thereby changing the amount of air entering the valve core cavity.

3. The two-stage flow synchronous regulating plug valve according to claim 2, characterized in that, The flow regulating port is configured as a fan-shaped hole or multiple vent holes of different sizes, and the valve core can increase its flow level through the flow regulating port.

4. The two-stage flow synchronous regulating plug valve according to claim 1, characterized in that, It also includes a valve stem assembly and a lever. The valve stem assembly passes through the valve core and extends into the rear cover cavity. At the same time, the lever is located in the rear cover cavity. One end of the lever abuts against the valve stem assembly and the other end extends into the bottom of the solenoid valve. By pressing the valve stem assembly inward, the lever is rotated and the solenoid valve is lifted upward. At this time, the air inlet of the solenoid valve is connected to the air outlet of the solenoid valve.

5. A two-stage flow synchronous regulating plug valve according to claim 4, characterized in that, The valve stem assembly includes: A valve stem, which is connected to the valve core, so that the valve stem can drive the valve core to rotate synchronously; The valve needle has one end connected to the end of the valve stem and the other end passing through the valve core and extending into the rear cover cavity to abut against the lever. By pressing the valve stem inward, the valve needle can be pushed forward and the lever can be rotated to lift the solenoid valve.

6. A two-stage flow synchronous regulating plug valve according to claim 5, characterized in that, The lever includes a rotating part and pressing and lifting parts at both ends. The pressing part abuts against the valve needle. The lifting part passes through the air outlet of the solenoid valve and extends to the bottom of the solenoid valve. When the valve needle pushes forward, the pressing part drives the rotating part to rotate and causes the lifting part to tilt upward to lift the solenoid valve.

7. A two-stage flow synchronous regulating plug valve according to claim 5, characterized in that, The valve core has a spring cavity and a slot located outside the valve core cavity. The spring cavity is used to install a spring for the valve needle to reset, and the slot cooperates with the pin on the valve stem.

Images