A valve and pressure driving device

Abstract

The present invention discloses a valve and a pressure drive device. The valve comprises at least a valve seat, a valve core, a valve body and an elastic member. The valve seat comprises a first seat body and a second seat body which are continuous in the axial direction. A valve core cavity is provided in the first seat body, and a valve core channel is provided in the second seat body which is connected to the valve core cavity. The valve core comprises a valve core body and a valve core rod. An air flow channel is provided between the valve core rod and the valve core channel. The valve core has a first sealing position. The elastic member is configured to drive the valve core to remain in the first sealing position. The valve body comprises at least a first valve body section and a second valve body section which are continuous in the axial direction. In the above structure, the special structural form of the valve core, valve seat and valve body not only integrates inflation, pressure maintenance and high-pressure release, but also cleverly utilizes the pressure difference to drive the valve seat to move axially, so that the gas in the pressure chamber can be quickly released, and the released pressure can be used to achieve the corresponding function.

Description

Technical Field

[0001] The invention relates to a valve and a pressure driving device. Background Art

[0002] Pressure-driven devices that store energy through compressed gas and then release the compressed gas to obtain power are widely used and have the technical advantages of low cost and high driving force. In addition, compressed air is a clean energy source and does not pollute the environment, so it has very large market potential.

[0003] The core component of the pressure-driven device is the air valve. The structure of the air valve determines its application scenario, energy storage form, power release efficiency, etc. In the existing technology, the air valve structure has technical defects such as complex structure and limited application scenarios.

[0004] In addition, in the pressure-driven device in the prior art, the pressure release mechanism and the launched component are usually independent of each other, and the pressure released by the pressure release component is used to perform work on the launching component. Its structure is complex and the energy loss is large. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a valve with a simple structure and a wider range of application scenarios, and a pressure drive device including the valve.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a valve, comprising at least:

[0007] A valve seat, the valve seat comprising a first seat body and a second seat body continuous in an axial direction, wherein a valve core cavity is provided in the first seat body, and a valve core channel is provided in the second seat body axially penetrating the second seat body, wherein the valve core channel is in communication with the valve core cavity;

[0008] a valve core, the valve core being axially movably connected to the valve seat, the valve core comprising a valve core body cooperating with the valve core cavity and a valve core rod cooperating with the valve core passage, an air flow passage being provided between an outer wall of the valve core rod and an inner wall of the valve core passage, the valve core having a first sealing position, in which the valve core body covers and seals the valve core passage, and a free end of the valve core rod protruding from a free end of the second seat body;

[0009] an elastic member configured to drive the valve core to maintain the first sealing position; and

[0010] The valve body comprises at least a first valve body section and a second valve body section which are continuous in the axial direction; a valve body cavity for accommodating a first seat body is provided in the first valve body section, the valve body cavity is communicated with the valve core cavity, the first seat body can move axially relative to the first valve body section in the valve body cavity, an air flow gap is provided between the outer wall of the first seat body and the inner wall of the valve body cavity, a slot which passes through the wall of the valve body cavity is provided in the position of the first valve body section close to the second valve body section; an air flow release channel which is communicated with the valve body cavity is provided in the second valve body section, and the valve seat has a second sealing position which covers and seals the air flow release channel.

[0011] In a preferred embodiment, the inner wall of the valve core channel is provided with a plurality of ribs extending in the axial direction, and the air flow channel is formed between adjacent ribs.

[0012] In a preferred embodiment, the convex ribs surround the valve core rod and are evenly distributed along the circumference.

[0013] In a preferred embodiment, the valve core body is provided with a first sealing surface facing the valve core rod side, and the bottom of the valve core cavity is provided with a second sealing surface arranged opposite to the first sealing surface. In the first sealing position, the first sealing surface covers and seals the valve core channel.

[0014] In a preferred embodiment, a mounting column for mounting an elastic member is provided on a side of the valve core body away from the valve core rod.

[0015] In a preferred embodiment, a first cavity is provided in the first seat body, an annular extension portion is provided in the first cavity and extends axially from the second sealing surface, a cylinder is adapted to be mounted on the annular extension portion, and the cylinder and the inner cavity of the annular extension portion form the valve core cavity.

[0016] In a preferred embodiment, an annular cavity is formed between the annular extension and the inner wall of the first cavity, and a positioning mechanism is provided between the bottom of the annular cavity and the free end of the cylinder.

[0017] In a preferred embodiment, the positioning mechanism includes a positioning protrusion provided on the bottom of the annular cavity and a positioning groove provided on the free end of the cylinder.

[0018] In a preferred embodiment, a vent groove communicating with the valve core cavity and the annular cavity is provided on the annular extension portion and the cylinder wall of the cylinder.

[0019] In a preferred embodiment, an annular groove is provided on the outer periphery of the first seat body near the third sealing surface.

[0020] In a preferred embodiment, a connecting portion is provided between the first valve body section and the second valve body section, the connecting portion is provided with a through hole for accommodating the passage of the second seat body, and a connecting arm is provided between the connecting portion and the inner wall of the second valve body section.

[0021] In a preferred embodiment, at the position where the third sealing surface contacts and cooperates with the fourth sealing surface, the free end of the valve core rod protrudes from the free end surface of the second valve body section.

[0022] In a preferred embodiment, the free end of the first valve body section is provided with an end cover.

[0023] In a preferred embodiment, an annular fourth sealing surface is provided at a position of the second valve body section close to the first valve body section, and a third sealing surface adapted to the fourth sealing surface is provided at one end of the first seat body facing the second seat body, and in the second sealing position, the third sealing surface is in contact with the fourth sealing surface.

[0024] A pressure-driven device comprises at least a pressure cylinder and the valve, wherein a pressure chamber is arranged inside the pressure cylinder, the valve is installed at the cylinder mouth of the pressure cylinder, the valve body chamber in the first valve body section is connected to the pressure chamber through the groove, and the outer wall of the second valve body section is sealed with the cylinder mouth of the pressure cylinder.

[0025] In a preferred embodiment, an annular platform is provided on the outer wall of the second valve body section near the free end.

[0026] A preferred embodiment further comprises a pressure cover for fixing the valve at the mouth of the pressure cylinder, wherein the pressure cover is fixedly connected to the mouth of the pressure cylinder.

[0027] In a preferred embodiment, the gland is connected to the mouth of the pressure cylinder by threads.

[0028] The beneficial effect of the valve of this embodiment is that, through the special structural form of the valve core, valve seat and valve body, a method different from the use of compressed gas in the prior art is formed. It not only integrates inflation, pressure maintenance and high-pressure release, but also cleverly utilizes the pressure difference to drive the valve seat to move axially, so as to quickly release the gas in the pressure chamber and utilize the released pressure to achieve the corresponding function.

[0029] The pressure-driven device of this embodiment has a wide range of applications. In this embodiment, the pressure cylinder and valve are an integral structure. By releasing the high-pressure gas in the pressure cylinder, the pressure cylinder and valve as a whole can be launched as a launchable component. This differs from the prior art structure in which the launchable component and the pressure release mechanism are independent of each other, and the pressure release mechanism is used to drive the launch component. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the external structure of the valve shown in the first embodiment of the present application;

[0031] Figure 2 for Figure 1 The cross-sectional view of the valve is shown, wherein the state is the state of the valve core rod being triggered at the moment of inflation or high pressure release;

[0032] Figure 3 for Figure 1 Another structural diagram of the valve shown;

[0033] Figure 4 for Figure 3 The cross-sectional view of the valve is shown, wherein the state is a schematic diagram of the state during high pressure release;

[0034] Figure 5 for Figure 1 A schematic diagram of the external structure of the valve body of the valve shown;

[0035] Figure 6 for Figure 5 A top view of the valve body shown;

[0036] Figure 7 for Figure 5 The cross-sectional structural diagram of the valve body is shown;

[0037] Figure 8 for Figure 1 Schematic diagram of the external structure of the valve seat in the valve shown;

[0038] Figure 9 for Figure 8 Another structural diagram of the valve seat (slightly viewed from above) is shown;

[0039] Figure 10 for Figure 8 The cross-sectional structural diagram of the valve seat is shown;

[0040] Figure 11 for Figure 8 Another structural diagram of the valve seat (viewed from above);

[0041] Figure 12 for Figure 1 A schematic diagram of the structure of the cylinder in the valve shown;

[0042] Figure 13 for Figure 1 A schematic diagram of the structure of the valve core in the valve shown;

[0043] Figure 14 for Figure 13 A schematic diagram of the front view structure of the valve core in the valve shown;

[0044] Figure 15 This is a schematic diagram of the external structure of the pressure drive device shown in the second embodiment of the present application;

[0045] Figure 16 for Figure 15 The schematic diagram of the explosion state structure of the pressure drive device shown;

[0046] Figure 17 This is a partial cross-sectional structural diagram of the pressure drive device shown in the second embodiment of the present application, wherein this state is a structural diagram of the initial state or the pressure-maintaining state;

[0047] Figure 18 This is a partial cross-sectional structural diagram of the pressure drive device shown in the second embodiment of the present application, wherein the state is a structural diagram of the moment when the valve core is triggered in the inflation state or when high pressure is released;

[0048] Figure 19 This is a partial cross-sectional structural diagram of the pressure drive device shown in the second embodiment of the present application, wherein this state is a structural diagram of the high-pressure release process. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0050] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, an integral connection, or a detachable connection; it can be the internal communication of two components; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] First embodiment

[0053] like Figure 1-4 As shown, a valve of this embodiment includes a valve seat 10 , a valve core 20 , a valve body 60 and an elastic member 40 .

[0054] The valve seat 10 of this embodiment is as follows: Figure 8-11 The device comprises a first seat body 11 and a second seat body 12 which are continuous in the axial direction, and the outer diameter of the first seat body 11 is greater than the outer diameter of the second seat body 12 .

[0055] like Figure 2 、 Figure 4 As shown, the first seat body 11 is provided with a valve core cavity 14; Figure 2 、 Figure 4 as well as Figure 10 As shown, the second seat body 12 is provided with a valve core channel 15 axially penetrating the second seat body, and the valve core channel 15 is communicated with the valve core cavity 14 .

[0056] The valve core 20 of this embodiment, as shown in FIG. Figure 13 、 Figure 14 As shown, it includes a valve core body 21 and a valve core rod 22, as shown in FIG. Figure 2 、 Figure 4 As shown, the valve core body 21 is installed in the valve core cavity 14 , and the valve core rod 22 is installed in the valve core channel 15 .

[0057] In this embodiment, the valve core 20 is axially movably connected to the valve seat 10, and the valve core body 21 has an axial movement space in the valve core cavity 14. An air flow channel 17 is provided between the outer wall of the valve core rod 22 and the inner wall of the valve core channel 15.

[0058] The valve seat 10 of this embodiment is as follows Figure 9 、 Figure 10 As shown, the first seat 11 is provided with a first cavity, the first cavity is provided with an annular extension 19 extending axially from the second sealing surface 18, and the annular extension 19 is adapted to be installed Figure 12 The cylinder 50 shown in FIG. 5 forms the valve core cavity 14 together with the inner cavity of the annular extension 19 .

[0059] In this embodiment, the cylinder body 50 includes a cylinder bottom 51 and a cylinder wall 52 adapted to and sleeved on the outer circumference of the annular extension portion 19 .

[0060] Preferably, in this embodiment, an annular cavity 110 is formed between the annular extension 19 and the inner wall of the first cavity, and a positioning mechanism is provided between the bottom of the annular cavity 110 and the free end of the cylindrical body 50. In this embodiment, the positioning mechanism includes a pair of oppositely disposed positioning protrusions 111 provided on the bottom of the annular cavity 110 and a positioning groove 53 provided on the free end of the cylindrical body 50. The number and shape of the positioning grooves 53 are adapted to the positioning protrusions 111.

[0061] In this embodiment, ventilation grooves are provided on the annular extension 19 and the cylinder wall 52 of the cylinder body 50 to connect the valve core cavity 14 and the annular cavity 110. Specifically, a first ventilation groove 54 is provided on the cylinder wall 52, and a second ventilation groove 112 is provided on the annular extension 19.

[0062] The first ventilation groove 54 and the second ventilation groove 112 are located correspondingly.

[0063] Preferably, in this embodiment, a pair of first ventilation grooves 54 are provided and arranged opposite to each other, and their shapes are the same as those of the positioning grooves 53. The advantage of such a setting is that when installing the cylinder 50, there is no need to deliberately match the positioning grooves and the positioning protrusions, and the installation is more convenient.

[0064] As a preference, in this embodiment, Figure 10 、 Figure 11 As shown, the inner wall of the valve core channel 15 is provided with a plurality of axially extending ribs 16, with the airflow channel 17 formed between adjacent ribs 16. The ribs 16 surround the valve core stem and are evenly distributed along the circumference. This structural arrangement ensures a high degree of concentricity between the valve core stem and the valve core channel, while ensuring an airflow channel between them. This provides structural support for the axial movement of the valve core relative to the valve seat.

[0065] In this embodiment, the valve core 20 has a first sealing position, in which the valve core body 21 covers and seals the valve core channel 15. Figure 4 As shown, in the first sealing position, the free end of the valve core rod 22 protrudes from the free end of the second seat body 12 .

[0066] In this embodiment, Figure 14 As shown, the valve core body 21 is provided with a first sealing surface 23 facing the side of the valve core rod 22. Correspondingly, the bottom of the valve core cavity 14 is provided with a second sealing surface 18 arranged opposite to the first sealing surface 23. In the first sealing position, the first sealing surface 23 contacts the second sealing surface 18 and covers and seals the valve core channel 15.

[0067] As an equivalent alternative, a sealing ring or a sealing gasket may be provided between the valve core body 21 and the bottom of the valve core cavity 14 to achieve sealing of the valve core channel.

[0068] As a preference, Figure 13 、 Figure 14 As shown, the valve core body 11 of this embodiment is provided with a mounting post 24 for mounting the elastic member 40 on the side away from the valve core rod 12. Figure 2 、 Figure 4As shown, one end of the elastic member 40 is mounted on the mounting post 24 , and the other end abuts against the top wall of the valve core cavity 14 .

[0069] In this embodiment, the elastic member 40 functions to provide an elastic preload force to the valve core 20 to maintain the valve core in the first sealing position. Preferably, in this embodiment, the elastic member 40 is a compression spring that is normally in a compressed state, thereby providing an elastic preload force to the valve core 20.

[0070] The valve body 60 of this embodiment is as follows Figure 5 、 Figure 7 As shown, it includes a first valve body section 61 and a second valve body section 62 that are continuous in the axial direction.

[0071] The first valve body section 61 is provided with a valve body cavity 63 for accommodating the first seat body 11 , and the valve body cavity 63 is in communication with the valve core cavity 14 . The first seat body 11 is axially movable relative to the first valve body section 61 within the valve body cavity 63 .

[0072] An airflow gap is provided between the outer wall of the first seat body 11 and the inner wall of the valve body cavity 63 , and a notch 65 penetrating the cavity wall of the valve body cavity 63 is provided in the first valve body section 61 near the second valve body section 62 .

[0073] In this embodiment, an annular fourth sealing surface 66 is provided at a position of the second valve body section 62 close to the first valve body section 61, wherein the end of the first seat body 11 facing the second seat body 12 is provided with a third sealing surface 113 adapted to the fourth sealing surface 66, and an airflow release channel 64 connected to the valve body cavity 63 is provided in the second valve body section 62.

[0074] In this embodiment, the valve seat has a second sealing position that covers and seals the airflow release channel 64 . In the second sealing position, the third sealing surface 113 contacts and cooperates with the fourth sealing surface 66 .

[0075] In this embodiment, Figure 10 As shown, the outer periphery of the first seat body 11 is close to the third sealing surface 113

[0076] An annular groove 114 is provided at the position.

[0077] In this embodiment, Figure 4-6 As shown, a connecting portion 67 is provided between the first valve body section 61 and the second valve body section 62. The connecting portion 67 is connected to the inner wall of the second valve body section 62 via a plurality of connecting arms 68. The connecting portion 67 is provided with a through hole 69 for accommodating the passage of the second seat 12. The airflow release channel 64 communicates with the valve body cavity 63 through the gaps between adjacent connecting arms 68.

[0078] In this embodiment, Figure 2 As shown, at the position where the third sealing surface 113 contacts and cooperates with the fourth sealing surface 66 , the free end of the valve core rod 22 protrudes from the free end surface of the second valve body section 62 .

[0079] As a preferred embodiment, as shown in FIG Figure 1-4 As shown, an end cover 70 is installed at the free end of the first valve body section 61 , and the end cover 70 seals the upper end of the valve body cavity 63 .

[0080] During the installation process of the valve of the above structure, the valve structure composed of the valve seat and the valve core is first placed into the valve body cavity 63 of the first valve body section 61, and the second seat body 12 is driven through the through hole 69, and finally the end cover 70 is sealed and fixedly connected to the free end of the first valve body section 61.

[0081] When the valve of the above structure is used in a pressure driven device, a pressure cylinder is sleeved on the outer side of the first valve body section 61, wherein the pressure chamber of the pressure cylinder is connected to the notch 65 on the first valve body section 61. When the driving device needs to be inflated, the outlet of the inflating device is connected to the air flow channel 17 of the valve, and the gas enters from the air flow channel 17 and is discharged. Figure 2 As shown, the valve core 20 is lifted up to drive the valve core away from the first sealing position. At this time, the elastic member 40 is further compressed, and air flows into the valve core cavity. Since the valve core cavity is connected with the valve body cavity 63 through the vent grooves (the first vent groove 54 and the second vent groove 112), high pressure is generated in the valve body cavity 63. This pressure drives the third sealing surface 113 of the first seat body to contact and cooperate with the fourth sealing surface 66, so that the valve body cavity 63 and the airflow release channel 64 are separated and sealed.

[0082] Because an airflow gap is provided between the outer wall of the first seat body 11 and the inner wall of the valve body cavity 63, the high-pressure gas in the valve body cavity 63 enters the pressure chamber through the gap and the notch 65, making the pressure in the pressure chamber equal to the pressure in the valve body cavity 63. After inflation is completed, the valve core 20 returns to the first sealing position under the elastic restoring force of the elastic member 40. At this time, the valve core cavity, the valve body cavity, and the pressure chamber are all in a high-pressure state. Based on the cooperation between the first sealing surface and the second sealing surface, and the cooperation between the third sealing surface and the fourth sealing surface, the system is in a pressure-maintaining state.

[0083] In this embodiment, since in the above-mentioned first sealing position, the free end of the valve core rod 22 protrudes from the free end of the second seat body 12, and at the position where the third sealing surface contacts the fourth sealing surface, the free end of the valve core rod 22 protrudes from the free end of the second valve body section.

[0084] When the free end of the valve core rod 22 is subjected to inward axial pressure, the valve core can be pushed away from the first sealing position, so that the valve core cavity and the valve body cavity are connected to the outside, and the pressure in the valve core cavity and the valve body cavity is reduced. At this time, since the pressure cavity is still in a high-pressure state, under the change of pressure difference, the high-pressure gas acts on the annular groove 114 of the first seat body 11, driving the valve seat to slide axially upward to Figure 3 、 Figure 4 In the state shown, the pressure chamber is connected to the airflow release channel 64 through the slot 65, the bottom of the valve body cavity and the gap between adjacent connecting arms 68, so that the high-pressure gas in the pressure chamber can be quickly released, and the corresponding function is achieved by using the quickly released high-pressure gas.

[0085] The beneficial effect of the valve structure mentioned above is that, through the special structural form of the valve core, valve seat and valve body, a method different from the use of compressed gas in the prior art is formed. It not only integrates inflation, pressure maintenance and high-pressure release together, but also has the technical advantages of simple structure and high functional integration. At the same time, the pressure difference is cleverly used to drive the valve seat to move axially, so that the gas in the pressure chamber can be quickly released, and the released pressure can be used to achieve the corresponding function.

[0086] Second embodiment

[0087] A pressure driven device of this embodiment, such as Figure 15 、 Figure 16 As shown, the valve comprises a pressure cylinder 80 and the valve described in the first embodiment. A pressure chamber 84 is provided within the pressure cylinder 80, and the valve is mounted at the cylinder opening 81 of the pressure cylinder 80. The valve body cavity 63 within the first valve body section 61 communicates with the pressure chamber 84 via the notch 65, and the outer wall of the second valve body section 62 is sealed to the cylinder opening 81 of the pressure cylinder 80.

[0088] Preferably, in this embodiment, a ring platform 610 is provided on the outer wall of the second valve body section 62 near the free end, and the diameter of the ring platform 610 is larger than the diameter of the barrel mouth 81. During the installation process, the first valve body section of the valve enters the pressure cylinder from the barrel mouth, is limited by the ring platform 610 and overlaps the barrel mouth position.

[0089] Furthermore, in this embodiment, a preferred fixing method is as follows: Figure 15-19 As shown, the cylinder mouth 81 is provided with an external thread 83, and the pressure cover 82 is threadedly connected to the external thread 83, thereby realizing a detachable fixed connection between the valve and the cylinder body.

[0090] Preferably, the positions where the barrel opening, the second valve body section and the gland cooperate can be adapted to be fitted with a seal to achieve a sealed connection between the second valve body section and the barrel opening.

[0091] In this embodiment, the principles of inflation, pressure maintenance and high-pressure gas release are the same as those of the second embodiment, wherein: Figure 17 The diagram shows the initial state or pressure holding state structure. Figure 18 The figure shows the structure of the valve core at the moment of triggering when the valve core is in the inflation state or when the high pressure is released; Figure 19 Shown is a schematic diagram of the structure during high-pressure release.

[0092] The pressure-driven device of this embodiment has a wide range of applications. In this embodiment, the pressure cylinder and valve are an integral structure. By releasing the high-pressure gas within the pressure cylinder, the pressure cylinder and valve, as a whole, can be launched as a launchable component. Possible applications include, for example, a children's toy mortar. After inflation, the pressure-driven device is released by applying force to the valve core rod, such as by impacting the ground or by inserting it into the barrel of a toy mortar. Once the valve core rod is stressed, the entire pressure-driven device is launched.

[0093] Another feasible application range is, for example, as a thrower in the field of firefighting. The cylinder where the pressure cylinder is located can also be used to place fire extinguishing materials. The release of high-pressure gas allows the thrower to be released, realizing non-contact fire extinguishing. In the prior art, the thrower for firefighting is usually configured with a high-pressure drive mechanism, through which the shells filled with fire extinguishing materials are thrown to the fire source to achieve long-distance fire extinguishing. The drawback of this method is that after a fire extinguishing shell is thrown, it needs to be inflated before the next one is thrown. The interval time is long, which affects the efficiency of fire extinguishing. However, with the structure of this embodiment, each independent thrower can be inflated in advance, and there is no need to inflate when throwing and launching. Multiple throwers can be launched at the same time. It is not limited by the efficiency and interval time of inflation, and its fire extinguishing efficiency will be greatly improved.

[0094] In short, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A valve, characterized in that: At least: A valve seat, the valve seat comprising a first seat body and a second seat body continuous in an axial direction, wherein a valve core cavity is provided in the first seat body, and a valve core channel is provided in the second seat body axially penetrating the second seat body, wherein the valve core channel is in communication with the valve core cavity; a valve core, the valve core being axially movably connected to the valve seat, the valve core comprising a valve core body cooperating with the valve core cavity and a valve core rod cooperating with the valve core passage, an air flow passage being provided between an outer wall of the valve core rod and an inner wall of the valve core passage, the valve core having a first sealing position, in which the valve core body covers and seals the valve core passage, and a free end of the valve core rod protruding from a free end of the second seat body; The valve core body is provided with a first sealing surface facing one side of the valve core rod, and in the first sealing position, the first sealing surface covers and seals the valve core channel; The valve body comprises at least a first valve body section and a second valve body section which are continuous in the axial direction; a valve body cavity for accommodating a first seat body is provided in the first valve body section, the valve body cavity is communicated with the valve core cavity, the first seat body can axially move relative to the first valve body section in the valve body cavity, an air flow gap is provided between the outer wall of the first seat body and the inner wall of the valve body cavity, a slot penetrating the wall of the valve body cavity is provided in the first valve body section near the second valve body section; an air flow release channel which is communicated with the valve body cavity is provided in the second valve body section, and the valve seat has a second sealing position which covers and seals the air flow release channel; The bottom of the valve core cavity is provided with a second sealing surface arranged opposite to the first sealing surface, the first seat is provided with a first cavity, the first cavity is provided with an annular extension portion extending axially from the second sealing surface, the annular extension portion is adapted to be mounted on a cylindrical body, and the cylindrical body and the inner cavity of the annular extension portion form the valve core cavity; The annular extension portion and the cylinder wall of the cylinder are provided with a vent groove communicating with the valve core cavity and the valve body cavity; A third sealing surface is provided on one end of the first seat body facing the second seat body, and an annular groove is provided on the outer circumference of the first seat body near the third sealing surface; an annular fourth sealing surface is provided on the second valve body section near the first valve body section, and in the second sealing position, the third sealing surface contacts the fourth sealing surface; The valve body further comprises an elastic member, which is disposed between the valve core and the cylinder and is configured to drive the valve core to remain in the first sealing position.

2. The valve according to claim 1, characterized in that The inner wall of the valve core channel is provided with a plurality of ribs extending in the axial direction, and the air flow channel is formed between adjacent ribs. The ribs surround the valve core rod and are evenly distributed along the circumference; the side of the valve core body away from the valve core rod is provided with a mounting column for mounting an elastic part.

3. The valve according to claim 2, characterized in that An annular cavity is formed between the annular extension and the inner wall of the first cavity, and a positioning mechanism is provided between the bottom of the annular cavity and the free end of the cylinder; the positioning mechanism includes a positioning protrusion provided on the bottom of the annular cavity and a positioning groove provided on the free end of the cylinder.

4. The valve according to claim 1, characterized in that A connecting portion is provided between the first valve body section and the second valve body section. The connecting portion is provided with a through hole for accommodating the passage of the second seat body. A connecting arm is provided between the connecting portion and the inner wall of the second valve body section.

5. The valve according to claim 4, characterized in that The free end of the first valve body section is provided with an end cover; at the position where the third sealing surface contacts and cooperates with the fourth sealing surface, the free end of the valve core rod protrudes from the free end surface of the second valve body section.

6. A pressure driven device, characterized in that: It at least includes a pressure cylinder and the valve according to claim 5, a pressure chamber is provided inside the pressure cylinder, the valve is installed at the cylinder mouth of the pressure cylinder, the valve body chamber in the first valve body section is connected with the pressure chamber through the notch, and the outer wall of the second valve body section is sealed with the cylinder mouth of the pressure cylinder; a ring platform is provided on the outer wall of the second valve body section near the free end.

7. The pressure drive device according to claim 6, characterized in that: It also includes a pressure cover for fixing the valve at the cylinder mouth of the pressure cylinder, and the pressure cover is fixedly connected to the cylinder mouth of the pressure cylinder.

8. The pressure drive device according to claim 7, characterized in that: The gland is connected to the opening of the pressure cylinder via threads.

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