A gas pressure reducing valve structure with an additional adjustable damping element and a method thereof

Abstract

The present invention discloses a gas pressure reducing valve structure with an additional adjustable damping element and a method thereof, and relates to the field of pressure reducing valve devices. The present invention reduces the fluctuation amplitude of the valve core under the valve opening condition by setting an adjustable damping element, which can not only increase the service life of the valve core, but also accelerate the process from the beginning of the high-pressure hydrogen entering to the stable pressure reduction. In actual use, due to the change of the internal pressure of the valve body, the valve core has a tendency to move downward. Due to the throttling effect of the slider and the valve body gap, the internal pressure of the feedback chamber is almost unchanged in a short time of opening, so the pressure in the upper chamber of the valve body increases, and an upward force is generated on the slider. The regulating spring connecting the slider and the valve core has an obstructive effect on the downward movement of the valve core, thereby reducing the fluctuation of the valve core in the open state, which can not only increase the life of the valve core and the stability of the output hydrogen, but also improve the valve adjustment accuracy, thereby improving the service life and working efficiency of the hydrogen fuel cell.

Description

Technical Field

[0001] The invention relates to the field of pressure reducing valve devices, in particular to an integrated two-stage pressure reducing valve group used in a hydrogen supply system of a fuel cell. Background Art

[0002] Hydrogen has the advantages of high efficiency, cleanliness, safety, and renewability, and is considered to be an important alternative to future energy. Among them, hydrogen fuel cell vehicles are one of the important areas of hydrogen application. In the use of hydrogen fuel cell vehicles, high-pressure hydrogen storage and transportation has become an important technical issue, and the high-pressure hydrogen pressure reducing valve group, as a key component in the high-pressure hydrogen storage system, is responsible for adjusting the high-pressure hydrogen to a suitable pressure and stabilizing the flow of hydrogen, maintaining the safety and stability of the high-pressure hydrogen system. Since hydrogen has a large mass energy density but a small volume energy density, in order for the hydrogen stored in electric vehicles to meet the needs of driving, high-pressure storage (35-70MPa) must be performed. If you want to increase the mileage of hydrogen fuel cell vehicles to 500 kilometers, 70MPa has become one of the main development goals of on-board hydrogen storage cylinder charging.

[0003] During vehicle driving, the pressure fluctuation range of the hydrogen storage bottle is 10-70MPa. The high-pressure hydrogen flows through the pipeline and is reduced to the front pressure of the hydrogen fuel cell (about 0.16MPa) in the pressure reducing valve group, and then flows into the battery to generate electricity. For this reason, the pressure reducing valve group is often composed of 2-3 pressure reducers. If the pressure reducing valve group fails during use, the high-pressure hydrogen in the hydrogen storage bottle cannot be reduced to the pressure before the fuel cell, which will greatly affect the battery life and energy conversion effect, and even break down the hydrogen fuel cell, which has a direct impact on vehicle safety.

[0004] The importance of high-pressure hydrogen pressure reducing valve group to the vehicle-mounted hydrogen system is self-evident. The increase in the pressure of the high-pressure hydrogen storage bottle puts higher requirements on the pressure reducing valve group, and it is crucial to ensure the safe and stable pressure reduction of the pressure reducing valve group. Since the first-stage pressure reducer is subjected to a large pressure difference during pressure reduction, its valve structure is a positive-acting valve, which leads to a large movement of the valve core in the open condition. The repeated collision between the conical valve core and the valve seat will greatly reduce the safety and stability of the gas pressure reducing valve. The first-stage pressure reducing valve core is the most core component of the pressure reducing valve, and its service life and working stability are related to the operation of the entire pressure reducing valve group.

[0005] In summary, it is necessary to optimize the internal structure of the pressure reducing valve to reduce the fluctuation of the first-stage pressure reducing valve of the pressure reducing valve group when it is opened, so as to ensure the stability of the first-stage pressure reducing valve core during use and a longer service life, thereby improving the working safety and service life of the hydrogen fuel cell. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects in the prior art and provide a gas pressure reducing valve structure and method with an additional adjustable damping element, specifically to provide an optimized structure and method that can increase the stability of the opening condition of the high-pressure hydrogen pressure reducing valve and improve the life of the valve core. By adding a spring slider mechanism behind the first-level valve core, the fluctuation amplitude of the valve core under the valve opening condition is reduced, which can not only increase the service life of the valve core, but also speed up the process from the initial entry of high-pressure hydrogen to stable pressure reduction.

[0007] The specific technical solutions adopted by the present invention are as follows:

[0008] In a first aspect, the present invention provides a gas pressure reducing valve structure with an additional adjustable damping element, comprising an inlet connector, a valve body, a valve core, a slider, an adjusting spring, a supporting spring, a positioning spring and an end cover;

[0009] The inlet at the bottom of the valve body is sealed and connected with an inlet joint, and the top is detachably sealed and connected with an end cover, and a valve core is arranged in the valve cavity of the valve body; the upper part of the valve core is sealed and slidably connected with the inner wall of the valve body in a circumferential direction, and the valve cavity is divided into an upper cavity and a lower cavity which are not connected to each other; the side wall of the valve body is provided with an outlet connected with the upper cavity; the lower part of the valve core extends into the first groove at the top of the inlet joint, and is sealed and slidably connected with the inner wall of the first groove of the inlet joint in a circumferential direction, and the lower end part is a conical structure and can seal the air inlet of the inlet joint; the lower part of the valve core is provided with an air inlet channel, and when the lower end part leaves the air inlet of the inlet joint, The air inlet can be connected with the upper cavity through the air inlet channel; a support spring which can always provide vertical elastic force is provided on the lower part of the valve core, and a positioning spring which can always provide vertical elastic force is provided between the top of the valve core and the end cover; the stiffness of the support spring is greater than the stiffness of the positioning spring, so that the valve core is in an open state in the initial state; a second groove is provided at the bottom of the end cover, a slide groove is vertically provided on the inner wall of the second groove, a slider is fitted through the sliding gap of the slide groove, and the second groove above the slider constitutes a feedback cavity; an adjusting spring which can always provide vertical elastic force is connected between the lower surface of the slider and the upper surface of the valve core.

[0010] Preferably, the valve core is a T-shaped structure, including a horizontal part and a vertical part; the horizontal part is circumferentially provided with a sealing ring for sealing with the inner wall of the valve body, dividing the valve cavity into an upper cavity and a lower cavity that are not connected to each other; the vertical part is sleeved with a support spring on the outer periphery, and the bottom part extends into the first groove of the inlet joint, and is sealed and connected to the inner wall of the first groove through a set sealing ring.

[0011] Furthermore, one end of the support spring is fixed to the inner bottom of the valve body, and the other end is pressed on the lower surface of the horizontal part of the valve core.

[0012] Furthermore, one end of the positioning spring is fixed to the bottom surface of the end cover, and the other end is pressed onto the upper surface of the horizontal portion of the valve core.

[0013] Preferably, the air inlet channel includes a horizontal channel and a vertical channel, a plurality of horizontal channels are opened through the lower part of the valve core extending into the first groove, all the horizontal channels are connected with the vertical channels, and the upper ends of the vertical channels are connected with the upper cavity.

[0014] Preferably, a third groove is provided on the upper portion of the valve core; one end of the regulating spring is located at the inner bottom of the third groove and fixedly connected thereto, and the other end is fixedly connected to the bottom of the slider.

[0015] Preferably, the inlet connector, valve body, valve core, slider, support spring, positioning spring, regulating spring and end cover are all coaxially arranged.

[0016] Preferably, the inlet connector is positioned with the valve body via a stop shoulder.

[0017] Preferably, the end cover is fixed to the valve body by bolts, and is connected to the upper end of the valve body by a sealing fit of a sealing ring.

[0018] In a second aspect, the present invention provides a method for using a gas pressure reducing valve structure with an additional adjustable damping element according to any one of the first aspects, as follows:

[0019] When the gas pressure reducing valve is in a stable working state, the gas inside the valve body is in a stable flow state, and the gas pressures in the upper chamber, lower chamber and feedback chamber are consistent; because the stiffness of the support spring is greater than the stiffness of the positioning spring, the valve core is in an open state at this time, and the pressure regulating area between the inlet and the inlet joint is fully open;

[0020] In a short period of time after the high-pressure gas is introduced through the air inlet of the inlet joint, due to the existence of the air inlet channel, the gas pressure in the upper chamber increases, while the gas pressure in the lower chamber remains basically stable. At this time, the downward pressure on the upper end face of the valve core is greater than the upward pressure on the lower end face, and the valve core moves downward; at the same time, due to the blocking effect of the slider, the gas pressure in the feedback chamber remains basically unchanged, the upward pressure on the lower end face of the slider is greater than the downward pressure on the upper end face, and the slider moves upward, driving the regulating spring to stretch, generating an upward pulling force on the valve core, delaying the downward movement trend of the valve core, making the valve core move less downward, thereby reducing the fluctuation of the valve core during the opening condition, which not only increases the stability of the output gas, but also protects the valve core.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1) The structure is simple and compact, and is easy to implement. By adding an adjustable damping element inside the first-stage valve core, the state of the first-stage pressure reducing valve opening under large pressure difference conditions is directly optimized.

[0023] 2) The adjustable damping element (including a slider and an adjusting spring) of the present invention directly improves the fluctuation when the valve core of the first-stage pressure reducing valve is opened, which may cause damage to the valve core or fluctuation in hydrogen pressure, thereby improving the first-stage pressure regulation accuracy and the service life of the valve core, thereby improving the service life and working efficiency of the hydrogen fuel cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the gas pressure reducing valve of the present invention;

[0025] Figure numerals: inlet connector 1, valve body 2, valve core 3, slider 4, support spring 5, positioning spring 6, regulating spring 7, inlet 8, outlet 9, feedback chamber 10, air intake channel 11, end cover 12. DETAILED DESCRIPTION

[0026] The present invention is further described and illustrated below in conjunction with the accompanying drawings and specific embodiments. The technical features of each embodiment of the present invention can be combined accordingly without conflicting with each other.

[0027] like Figure 1 As shown, a gas pressure reducing valve structure with an additional adjustable damping element provided by the present invention mainly comprises an inlet connector 1, a valve body 2, a valve core 3, a slider 4, an adjusting spring 7, a supporting spring 5, a positioning spring 6 and an end cover 12. The slider 4 and the adjusting spring 7 are used as adjustable damping elements.

[0028] The structure and connection method of each component will be described in detail below.

[0029] In the present invention, an inlet 8 is provided at the bottom of the valve body 2, and an inlet joint 1 is sealed and connected at the inlet 8. In actual use, the inlet joint 1 is connected to the inlet 8 through the sealing fit of the sealing ring, and the inlet joint 1 is coaxially arranged with the valve body 2 and the valve core 3. The top of the valve body 2 is detachably sealed and connected with an end cover 12, and a valve core 3 is arranged in the valve cavity of the valve body 2. In actual use, the end cover 12 is coaxially arranged with the valve body 2, fixed with the valve body 2 by bolts, and connected with the upper end of the valve body 2 by the sealing fit of the sealing ring; there are a total of six bolts connecting the end cover 12 with the valve body 2, which are evenly distributed on the end cover 12 along the circumferential direction.

[0030] In the present invention, the upper part of the valve core 3 is circumferentially sealed and slidably connected to the inner wall of the valve body 2, dividing the valve cavity into an upper cavity and a lower cavity that are not connected to each other. The valve core 3 can slide up and down along the inner wall of the valve body 2. An outlet 9 is provided on the side wall of the valve body 2, and the outlet 9 is connected to the upper cavity. The lower part of the valve core 3 extends into the first groove at the top of the inlet connector 1, and is circumferentially sealed and slidably connected to the inner wall of the first groove of the inlet connector 1. The lower end is a conical structure and can seal the air inlet of the inlet connector 1. An air inlet channel 11 is provided at the lower part of the valve core 3. When the lower end of the valve core 3 leaves the air inlet of the inlet connector 1, the air inlet can be connected to the upper cavity through the air inlet channel 11. In other words, the gas after decompression through the gap between the conical structure of the valve core 3 and the inlet connector 1 enters the upper cavity of the valve body 2 through the air inlet channel 11.

[0031] In actual use, the valve core 3 can move up and down in a small range along the axial direction, and can also move relative to the inlet joint 1; there will be no relative movement between the inlet joint 1 and the valve body 2.

[0032] As a preferred embodiment of the present invention, the valve core 3 is a T-shaped structure, including a connected horizontal part and a vertical part. A sealing ring is provided on the outer circumference of the horizontal part, and the sealing ring is used to be connected to the inner wall of the valve body 2 in a sealed sliding manner. Through the provision of the sealing ring, the horizontal part divides the valve cavity into an upper cavity and a lower cavity that are not connected to each other. A supporting spring 5 is sleeved on the outer circumference of the vertical part, and the bottom part extends into the first groove of the inlet joint 1, and is sealed and connected to the inner wall of the first groove through the provided sealing ring. In actual use, due to the sealing effect of the sealing ring, the internal pressure of the lower cavity is basically in a constant state.

[0033] As a preferred embodiment of the present invention, the air intake channel 11 mainly includes a horizontal channel and a vertical channel. A plurality of horizontal channels are opened through the lower part of the valve core 3 extending into the first groove. The horizontal channels are arranged above the adjacent conical structure. All horizontal channels are connected to the vertical channels, and the upper ends of the vertical channels are connected to the upper cavity.

[0034] In the present invention, a support spring 5 that can always provide vertical elastic force is sleeved on the lower part of the valve core 3, and a positioning spring 6 that can always provide vertical elastic force is arranged between the top of the valve core 3 and the end cover 12. The stiffness of the support spring 5 is greater than the stiffness of the positioning spring 6, so that the valve core 3 is in an open state in the initial state (i.e., before the valve is passed with gas).

[0035] As a preferred embodiment of the present invention, one end of the support spring 5 is fixed in the groove at the bottom of the valve body 2 for positioning, and the other end is pressed on the lower surface of the horizontal part of the valve core 3. One end of the positioning spring 6 is fixed in the groove at the bottom of the end cover 12 for positioning, and the other end is pressed on the upper surface of the horizontal part of the valve core 3.

[0036] In the present invention, a second groove is provided at the bottom of the end cover 12, a slide groove is provided vertically on the inner wall of the second groove, a slider 4 is fitted through the sliding gap of the slide groove, and the second groove above the slider 4 constitutes a feedback chamber 10. An adjustment spring 7 which can always provide vertical elastic force is connected between the lower surface of the slider 4 and the upper surface of the valve core 3.

[0037] As a preferred embodiment of the present invention, a third groove is provided on the upper part of the valve core 3, one end of the regulating spring 7 is located at the bottom of the third groove and is fixedly connected thereto, and the other end of the regulating spring 7 is fixedly connected to the bottom of the slider 4. The feedback cavity 10 is a cavity located at the center of the end cover 12, coaxial with the valve core 3; the slider 4 slides in the feedback cavity 10 and moves through the slide groove; the regulating spring 7 is connected to the slider 4 and the inner groove surface of the valve core 3; the regulating spring 7 is in a slightly compressed state only under the gravity of the slider 4 when not working.

[0038] As a preferred embodiment of the present invention, the inlet connector 1, the valve body 2, the valve core 3, the slider 4, the support spring 5, the positioning spring 6, the regulating spring 7 and the end cover 12 are all coaxially arranged.

[0039] In actual use, the adjustable damping element can be adjusted to the opening condition under different rated inlet pressures by selecting adjustment springs 7 of different specifications.

[0040] By using the above-mentioned gas pressure reducing valve structure with an additional adjustable damping element, the present invention also provides a method for increasing the stability of the opening condition of the high-pressure hydrogen pressure reducing valve and improving the life of the valve core. The specific use method is as follows:

[0041] When the gas pressure reducing valve is in a stable working state, the gas inside the valve body 2 is in a stable flow state, and the gas pressures in the upper chamber, the lower chamber and the feedback chamber 10 are consistent. Since the stiffness of the support spring 5 is greater than the stiffness of the positioning spring 6, the valve core 3 is in an open state at this time, and the pressure regulating area between the valve core 3 and the air inlet of the inlet connector 1 is fully open.

[0042] In a short period of time after the high-pressure gas is introduced through the air inlet of the inlet connector 1, the gas pressure in the upper chamber increases due to the existence of the air inlet passage 11, while the gas pressure in the lower chamber remains basically stable. At this time, the downward pressure on the upper end face of the valve core 3 is greater than the upward pressure on the lower end face, and the valve core 3 moves downward. At the same time, due to the blocking effect of the slider 4, the gas pressure in the feedback chamber 10 remains basically unchanged, the upward pressure on the lower end face of the slider 4 is greater than the downward pressure on the upper end face, and the slider 4 moves upward, driving the adjustment spring 7 to stretch, generating an upward pulling force on the valve core 3, delaying the downward movement trend of the valve core 3, making the valve core 3 move downward less, thereby reducing the fluctuation of the valve core 3 in the open working condition, which not only increases the stability of the output gas, but also protects the valve core 3.

[0043] That is to say, without adding an adjustable damping element: when the valve is in a stable working state, the hydrogen pressure inside the valve body 2 is basically at 0.3MPa, in a stable flow state, and the valve core 3 is in a fully open state. At this time, the pressure regulating area between the valve core 3 and the inlet joint 1 is fully open. In a short period of time after the high-pressure hydrogen is introduced through the inlet joint 1, the pressure in the upper chamber of the valve body 2 is higher than 0.3MPa (for example, reaching 0.7MPa), while the pressure in the lower chamber remains stable. At this time, the higher pressure will act on the upper end face of the valve core 3, causing the valve core 3 to be forced downward, thereby reducing the opening of the valve core 3, and even causing the valve core 3 to directly hit the conical inclined surface on the inlet joint 1. The valve core 3 will continue to fluctuate for a period of time, and will only stabilize when the internal pressure of the valve body 2 gradually stabilizes to 0.3MPa. The fluctuation of the valve core 3 under the open working condition not only affects the stability of the output hydrogen, but also greatly affects the service life of the valve core 3.

[0044] After adding the adjustable damping element: Under the opening condition, the internal pressure of the valve body 2 will still be greater than 0.3MPa at the beginning, thus acting on the valve core 3, causing it to tend to move downward. However, since the pressure inside the valve body 2 is greater than 0.3MPa when it is just opened, the pressure in the feedback chamber 10 has almost no significant change due to the throttling effect of the slide groove, and is still around 0.3MPa. Therefore, the inside of the valve body 2 will also act on the slider 4, causing it to tend to move upward, and the regulating spring 7 is stretched at this time. Since the tension of the regulating spring 7 acts upward on the valve core 3, the downward movement of the valve core 3 is smaller, so that the fluctuation of the valve core 3 is reduced under the opening condition. Not only does it increase the stability of the output hydrogen, but it also protects the valve core 3.

[0045] In the present invention, after high-pressure hydrogen is inputted into the inlet joint, the valve core tends to move downward due to the change in the pressure inside the valve body. Due to the throttling effect of the slider and the valve body gap, the pressure inside the feedback chamber hardly changes in a short time after opening, so the pressure in the upper chamber of the valve body increases, generating an upward force on the slider. The regulating spring connecting the slider and the valve core has an obstructive effect on the downward movement of the valve core, thereby reducing the fluctuation of the valve core in the open state, which not only increases the life of the valve core and the stability of the output hydrogen, but also improves the valve adjustment accuracy, thereby improving the service life and working efficiency of the hydrogen fuel cell.

[0046] The above-described embodiment is only a preferred solution of the present invention, but it is not intended to limit the present invention. A person skilled in the relevant technical field may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A gas pressure reducing valve structure with an additional adjustable damping element, characterized in that: It comprises an inlet connector (1), a valve body (2), a valve core (3), a slider (4), an adjusting spring (7), a supporting spring (5), a positioning spring (6) and an end cover (12); The inlet (8) at the bottom of the valve body (2) is sealed and connected to an inlet joint (1), and the top is detachably sealed and connected to an end cover (12). A valve core (3) is provided in the valve cavity of the valve body (2); the upper part of the valve core (3) is circumferentially sealed and slidably connected to the inner wall of the valve body (2), dividing the valve cavity into an upper cavity and a lower cavity that are not connected to each other; the side wall of the valve body (2) is provided with an outlet (9) that is connected to the upper cavity; the lower part of the valve core (3) extends into the first groove at the top of the inlet joint (1), and is circumferentially sealed and slidably connected to the inner wall of the first groove of the inlet joint (1), and the lower end is a conical structure and can seal the air inlet of the inlet joint (1); the lower part of the valve core (3) is provided with an air inlet channel (11), and when the lower end leaves the air inlet of the inlet joint (1), the air inlet channel (11) is opened. , the air inlet can be connected to the upper chamber through the air inlet channel (11); the lower part of the valve core (3) is sleeved with a support spring (5) that can always provide vertical elastic force, and a positioning spring (6) that can always provide vertical elastic force is provided between the top of the valve core (3) and the end cover (12); the stiffness of the support spring (5) is greater than the stiffness of the positioning spring (6), so that the valve core (3) is in an open state in the initial state; a second groove is opened at the bottom of the end cover (12), and a sliding groove is vertically provided on the inner wall of the second groove, and a slider (4) is matched through the sliding gap of the sliding groove, and the second groove located above the slider (4) constitutes a feedback chamber (10); an adjustment spring (7) that can always provide vertical elastic force is connected between the lower surface of the slider (4) and the upper surface of the valve core (3).

2. A gas pressure reducing valve structure with an additional adjustable damping element according to claim 1, characterized in that: The valve core (3) is a T-shaped structure, comprising a horizontal portion and a vertical portion; the horizontal portion is provided with a sealing ring around its circumference for sealing with the inner wall of the valve body (2), thereby dividing the valve cavity into an upper cavity and a lower cavity that are not connected to each other; the vertical portion is provided with a supporting spring (5) around its outer circumference, and the bottom portion extends into the first groove of the inlet joint (1) and is sealed and connected to the inner wall of the first groove via a provided sealing ring.

3. A gas pressure reducing valve structure with an additional adjustable damping element according to claim 2, characterized in that: One end of the support spring (5) is fixed to the inner bottom of the valve body (2), and the other end is pressed onto the lower surface of the horizontal part of the valve core (3).

4. A gas pressure reducing valve structure with an additional adjustable damping element according to claim 2, characterized in that: One end of the positioning spring (6) is fixed to the bottom surface of the end cover (12), and the other end is pressed onto the upper surface of the horizontal portion of the valve core (3).

5. A gas pressure reducing valve structure with an additional adjustable damping element according to claim 1, characterized in that: The air inlet channel (11) comprises a horizontal channel and a vertical channel. A plurality of horizontal channels are opened through the lower part of the valve core (3) extending into the first groove. All horizontal channels are connected to the vertical channels. The upper ends of the vertical channels are connected to the upper chamber.

6. A gas pressure reducing valve structure with an additional adjustable damping element according to claim 1, characterized in that: A third groove is provided on the upper part of the valve core (3); one end of the regulating spring (7) is located at the bottom of the third groove and is fixedly connected thereto, and the other end is fixedly connected to the bottom of the slider (4).

7. A gas pressure reducing valve structure with an additional adjustable damping element according to claim 1, characterized in that: The inlet joint (1), valve body (2), valve core (3), slider (4), support spring (5), positioning spring (6), adjustment spring (7) and end cover (12) are all coaxially arranged.

8. The gas pressure reducing valve structure with an additional adjustable damping element according to claim 1, characterized in that: The inlet joint (1) is positioned with the valve body (2) via a stop shoulder.

9. A gas pressure reducing valve structure with an additional adjustable damping element according to claim 1, characterized in that: The end cover (12) is fixed to the valve body (2) by means of bolts, and is connected to the upper end of the valve body (2) by means of a sealing ring.

10. A method for using the gas pressure reducing valve structure with an additional adjustable damping element according to any one of claims 1 to 9, characterized in that: The details are as follows: When the gas pressure reducing valve is in a stable working state, the gas inside the valve body (2) is in a stable flow state, and the gas pressures in the upper chamber, the lower chamber and the feedback chamber (10) are consistent; because the stiffness of the support spring (5) is greater than the stiffness of the positioning spring (6), the valve core (3) is in an open state at this time, and the pressure regulating area between the valve core (3) and the gas inlet of the inlet connector (1) is fully open; In a short period of time after high-pressure gas is introduced into the air inlet through the inlet joint (1), due to the existence of the air inlet passage (11), the gas pressure in the upper chamber increases, while the gas pressure in the lower chamber remains basically stable. At this time, the downward pressure on the upper end face of the valve core (3) is greater than the upward pressure on the lower end face, and the valve core (3) moves downward. At the same time, due to the blocking effect of the slider (4), the gas pressure in the feedback chamber (10) remains basically unchanged, the upward pressure on the lower end face of the slider (4) is greater than the downward pressure on the upper end face, and the slider (4) moves upward, driving the adjustment spring (7) to stretch, generating an upward pulling force on the valve core (3), delaying the downward movement trend of the valve core (3), making the valve core (3) move less downward, thereby reducing the fluctuation of the valve core (3) during the opening condition, which not only increases the stability of the output gas, but also protects the valve core (3).

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