A fully self-tightening sealing truncated cone valve and its processing and assembly method

Abstract

The present invention relates to a fully self-tightening truncated cone valve and a processing and assembly method thereof, which mainly includes a valve body, a valve cover, a valve core and a driving device. The valve body is provided with a truncated cone chamber, the truncated cone chamber is provided with a columnar through hole and a valve core is installed, the upper part of the valve core is a truncated cone, the lower part is a valve stem, the rod body of the valve stem passes through the valve body and is connected to the driving device below, a truncated cone is provided on the valve core truncated cone and a circular through hole passing through the side, a sealing mechanism is provided between the outer side surface of the valve core truncated cone and the truncated cone chamber, the ratio of the self-tightening force area of ​​the valve core truncated cone to the sealing surface area is greater than 1.35, and a magnetic elastic mechanism is provided on the valve body to give the valve core an axial downward thrust, the valve core's own gravity forms an initial pre-tightening force, and the magnetic elastic force strengthens the initial pre-tightening effect of the valve core. The truncated cone valve has a very simple structure, can achieve full self-tightening sealing and fully automatic compensation for wear, and compared with other existing valves, it has a small opening and closing torque, a good sealing effect, and a very long service life.

Description

Technical Field

[0001] The invention relates to a fully self-tightening sealing truncated cone valve and a processing and assembling method thereof. Background Art

[0002] Existing valves mainly achieve internal sealing by locking bolts or valve stems to make the valve core and valve seat sealing surface fit effectively, and external sealing is achieved by using various stuffing boxes or sealing gasket devices. The internal seal usually does not have self-tightening sealing performance. The external sealing device is reasonably designed and can achieve self-tightening sealing by using the pressure of the conveying medium. However, no matter which type of valve is used, the sealing surface will wear and corrode after a period of use, resulting in a decrease in the sealing pressure ratio, and it can usually only achieve very limited wear self-compensation. Therefore, internal and external leakage often occurs. Even for valves with self-sealing properties, internal and external leakage are difficult to avoid as the sealing material hardens or ages. For this reason, a fully self-tightening sealing valve is needed. Summary of the invention

[0003] The object of the present invention is to provide a fully self-tightening truncated cone valve and a processing and assembly method thereof. The truncated cone valve has a simple structure, small torque, strong wear self-compensation capability, can achieve fully self-tightening sealing inside and outside, and has a good sealing effect.

[0004] The technical solution of the present invention is: a fully self-tightening truncated cone valve, including a valve body, a valve cover and a valve core. The valve body is laterally provided with an inlet channel and an outlet channel, and longitudinally provided with an upper through hole connected to the inlet channel and a truncated cone chamber connected to the outlet channel and provided with a columnar through hole at the bottom, the upper end surface of the upper through hole is provided with an annular platform connected to the valve cover, the valve core is installed in the truncated cone chamber, the upper part of the valve core is a truncated cone, and the lower part is a valve stem, the stem of the valve stem passes through the valve body and is connected to the driving device, the truncated cone is provided with a truncated cone cavity and a circular through hole passing through the side, a sealing mechanism is provided between the outer side surface of the truncated cone and the truncated cone chamber, a pressure ring is provided on the upper end surface of the truncated cone chamber, and a magnetic elastic mechanism that enables the valve core to have an axial downward thrust is provided below the pressure ring,

[0005] Furthermore, the magnetic elastic mechanism includes a positioning groove arranged on the pressure ring, and a pair of annular magnetic blocks with the same matching surface magnetic poles are arranged on the positioning groove, and the annular magnetic block located on the lower side abuts against the upper bottom surface of the valve core cone.

[0006] Furthermore, the sealing mechanism includes an upper sealing ring and a lower sealing ring arranged on the upper and lower parts of the outer side of the cone, and a sealing strip is arranged between the upper sealing ring and the lower sealing ring to divide the side of the cone into four areas along the circumferential direction, and the circular through hole is arranged in one of the areas.

[0007] Furthermore, the upper sealing ring, the lower sealing ring and the sealing strip on the outer side surface of the truncated cone are integrally formed with the valve core, and the sealing surfaces of the upper sealing ring, the lower sealing ring and the sealing strip are located on the same conical surface.

[0008] Furthermore, the sealing mechanism includes a truncated cone-shaped valve sleeve wrapped around the valve core cone, and an upper sealing ring and a lower sealing ring are provided on the upper and lower parts of the outer side surface of the valve sleeve. A sealing strip is provided between the upper sealing ring and the lower sealing ring, which divides the truncated cone side surface into four areas along the circumferential direction, and a circular hole matching the circular through hole is provided in one of the areas.

[0009] Furthermore, the upper and lower parts of the side surface of the valve core cone are respectively provided with annular positioning flanges corresponding to the upper and lower sealing rings, and a positioning protrusion corresponding to the sealing strip is provided between the positioning flanges to divide the side surface of the cone into four areas along the circumferential direction. The circular through hole is provided in one of the areas, and n small holes communicating with the cone-shaped cavity are provided in the other three areas. The valve sleeve is wrapped on the cone by injection molding, and the inner and outer sides of the valve sleeve are connected through small holes.

[0010] Furthermore, the upper sealing ring, the lower sealing ring and the sealing strip on the outer side of the valve sleeve are integrally formed with the valve sleeve during injection molding, and the sealing surfaces formed by the upper sealing ring, the lower sealing ring and the sealing strip are located on the same conical surface.

[0011] Furthermore, the ratio of the self-tightening force bearing area of ​​the truncated cone to the sealing surface area is greater than 1.35.

[0012] Furthermore, a sealing groove is provided on the annular end surface of the valve body for cooperating with the valve cover, and a sealing ring is provided in the sealing groove.

[0013] Furthermore, a clearance for self-compensation of wear is reserved between the lower bottom surface of the truncated cone of the valve core and the chamber.

[0014] Furthermore, the processing and assembly method of the fully self-tightening truncated cone valve comprises the following steps:

[0015] (1) Prefabricated valve body, valve cover and valve core. After machining, the sealing surface formed by the truncated cone chamber of the valve body and the truncated cone of the valve core is hardened by spraying, nitriding or ion plating to improve wear resistance. The sealing surface is closely fitted to form an effective seal through mechanical grinding and matching by a grinder or other machine.

[0016] (2) The valve core cone is lined with a soft sealing material such as PFA by injection molding, and the sealing surface of the one-piece valve sleeve is precision machined to ensure that the taper and roughness meet the sealing requirements;

[0017] (3) Install the valve core in the truncated cone-shaped chamber of the valve body, ensuring that the truncated cone of the valve core fits against the chamber wall by its own weight, and the cylindrical valve stem of the valve core passes through the valve body and is connected to the drive device below;

[0018] (4) The compression ring is locked in the valve body by bolts and washers, so that the annular magnetic block always contacts the upper bottom surface of the valve core.

[0019] (5) Connect and seal the valve body and valve cover with bolts and gaskets.

[0020] Compared with the prior art, the present invention has the following advantages: the structure of the truncated cone valve is very simple and compact, the initial pre-tightening force is formed by the deadweight of the valve core and the initial pre-tightening is strengthened by the annular magnetic block; the simple structure and the effect of the medium pressure realize the effective full self-tightening sealing and full automatic wear compensation of the truncated cone valve; compared with the existing valves, it has a long service life, small torque, and is very easy to process, assemble and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure and valve core force of the fully self-tightening hard-sealed truncated cone valve of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure and valve core force of the fully self-tightening soft-sealed truncated cone valve of the present invention;

[0023] Figure 3 It is a schematic diagram of the valve core structure of the fully self-tightening hard-sealed truncated cone valve of the present invention;

[0024] Figure 4 For the present invention Figure 3 Schematic diagram of the structure viewed from above;

[0025] Figure 5 It is a structural schematic diagram of a fully self-tightening soft-sealed round table valve lined with a valve core of the present invention;

[0026] Figure 6 For the present invention Figure 5 Schematic diagram of the structure viewed from above;

[0027] In the figure: 10-valve body 11-upper through hole 12-truncated cone chamber 13-sealing ring 14-bolt 15-gasket 20-valve cover 30-valve core 31-truncated cone cavity 32-circular through hole 33-upper sealing ring 34-lower sealing ring 35-sealing strip 36-positioning flange 37-positioning convex strip 38-valve sleeve 40-pressing ring 41-positioning groove 42-annular magnetic block 50-limiting block 60-wear compensation gap 70-driving device S1-sealing surface area S2-self-tightening force area. DETAILED DESCRIPTION

[0028] In order to make the above features and advantages of the present invention more easily understood, embodiments are given below with reference to the accompanying drawings for detailed description, but the present invention is not limited thereto.

[0029] Example 1 Reference Figure 1 , Figure 3 , Figure 4

[0030] A fully self-tightening hard-sealed truncated cone valve comprises a valve body 10, a valve cover 20 and a valve core 30. The valve body is provided with an inlet channel and an outlet channel in the transverse direction, and is provided with an upper through hole 11 connected with the inlet channel and a truncated cone chamber 12 connected with the outlet channel and provided with a columnar through hole in the lower part in the longitudinal direction, the upper end surface of the upper through hole is provided with an annular platform connected with the valve cover, the valve core is installed in the truncated cone chamber, the upper part of the valve core is a truncated cone, and the lower part is a valve stem, the stem of the valve stem passes through the valve body and is connected with a driving device 70, the truncated cone is provided with a truncated cone cavity 31 and a circular through hole 32 passing through the side, a sealing mechanism is provided between the outer side surface of the truncated cone and the truncated cone chamber, a pressure ring 40 is provided on the upper end surface of the truncated cone chamber, and a magnetic elastic mechanism that enables the valve core to have an axial downward thrust is provided below the pressure ring.

[0031] In this embodiment, in order to realize the axial downward thrust of the valve core, the magnetic elastic mechanism includes a positioning groove 41 arranged on the pressure ring, and a pair of annular magnetic blocks 42 with the same magnetic poles on the mating surfaces are arranged on the positioning groove, and the annular magnetic block located on the lower side is abutted against the upper bottom surface of the valve core cone.

[0032] In this embodiment, in order to ensure the sealing effect, the sealing mechanism includes an upper sealing ring 33 and a lower sealing ring 34 arranged on the upper and lower parts of the outer side surface of the cone, and a sealing strip 35 is arranged between the upper sealing ring and the lower sealing ring to divide the side surface of the cone into four areas along the circumferential direction. The circular through hole is arranged in one of the areas, and the other adjacent area is used as the inner seal of the cone valve.

[0033] In this embodiment, in order to ensure the sealing effect, the upper sealing ring, the lower sealing ring and the sealing strip on the outer side of the truncated cone are integrally formed with the valve core, and the sealing surfaces of the upper sealing ring, the lower sealing ring and the sealing strip are located on the same conical surface.

[0034] In this embodiment, the ratio of the self-tightening force bearing area S2 of the truncated cone to the sealing surface area S1 is greater than 2.69.

[0035] In this embodiment, in order to achieve self-compensation after wear, a wear compensation gap 60 is reserved between the truncated cone bottom surface of the valve core and the truncated cone-shaped chamber.

[0036] In this embodiment, in order to ensure the sealing effect between the valve body and the valve cover, a sealing groove is further provided on the annular platform of the main valve body for cooperating with the valve cover, and a sealing ring 13 is provided in the sealing groove. The valve body and the valve cover are connected via bolts 14 and gaskets 15.

[0037] In this embodiment, the valve core's own gravity makes the valve core and the truncated cone-shaped chamber fit together at all times, thereby forming an initial sealing pressure ratio. The elastic force generated by the magnetic blocks with the same magnetic poles and the same direction as the gravity of the valve core strengthens the pre-tightening effect between the valve core and the truncated cone-shaped chamber. During the opening and closing process of the truncated cone valve, the medium pressure P acts on the self-tightening force-bearing surface of the valve core truncated cone, so that the sealing pressure ratio on the sealing surface exceeds the medium pressure by more than 2.69 times. Regardless of how the medium pressure changes, the truncated cone valve can maintain a good sealing effect. Due to the conical surface fit, the more the truncated cone valve sealing surface is worn, the smoother it becomes, and the better the fit. After wear occurs, under the action of the valve core's gravity and the medium pressure, the valve core automatically moves downward, and continues to maintain its close fit with the truncated cone-shaped chamber, so that the truncated cone valve has a reliable sealing effect and a long service life.

[0038] In this embodiment, the assembly method of the fully self-tightening truncated cone valve comprises the following steps:

[0039] (1) The valve body, valve cover and valve core are prefabricated. After machining, the sealing surface formed by the truncated cone chamber of the valve body and the truncated cone of the valve core is hardened by spraying, nitriding or ion plating to improve wear resistance. The sealing surface is closely fitted to form an effective seal through mechanical grinding and matching.

[0040] (2) Install the valve core in the truncated cone-shaped chamber of the valve body, ensuring that the truncated cone of the valve core fits against the chamber wall by its own weight, and the cylindrical valve stem of the valve core passes through the valve body and is connected to the drive device below;

[0041] (3) The compression ring is locked in the valve body by means of bolts and washers so that the annular magnetic block always contacts the upper bottom surface of the valve core.

[0042] (4) Connect and seal the valve body and valve cover with bolts and gaskets.

[0043] Example 2 Reference Figure 2 , Figure 5 , Figure 6

[0044] A fully self-tightening soft-sealed truncated cone valve comprises a valve body 10, a valve cover 20 and a valve core 30. The valve body is provided with an inlet channel and an outlet channel in the transverse direction, and is provided with an upper through hole 11 connected with the inlet channel and a truncated cone chamber 12 connected with the outlet channel and provided with a columnar through hole in the lower part in the longitudinal direction, the upper end surface of the upper through hole is provided with an annular platform connected with the valve cover, the valve core is installed in the truncated cone chamber, the upper part of the valve core is a truncated cone, and the lower part is a valve stem, the stem of the valve stem passes through the valve body and is connected with a driving device 70, the truncated cone is provided with a truncated cone cavity 31 and a circular through hole 32 passing through the side, a sealing mechanism is provided between the outer side surface of the truncated cone and the truncated cone chamber, a pressure ring 40 is provided on the upper end surface of the truncated cone chamber, and a magnetic elastic mechanism that enables the valve core to have an axial downward thrust is provided below the pressure ring.

[0045] In this embodiment, in order to realize the axial downward thrust of the valve core, the magnetic elastic mechanism includes a positioning groove 41 arranged on the pressure ring, and a pair of annular magnetic blocks 42 with the same magnetic poles on the mating surfaces are arranged on the positioning groove, and the annular magnetic block located on the lower side is abutted against the upper bottom surface of the valve core cone.

[0046] In this embodiment, in order to achieve a soft sealing effect, the sealing mechanism includes a conical valve sleeve 38 wrapped around the valve core conical cone, and an upper sealing ring 33 and a lower sealing ring 34 are provided on the upper and lower parts of the outer side surface of the valve sleeve. A sealing strip 35 is provided between the upper sealing ring and the lower sealing ring, which divides the conical side surface into four areas along the circumferential direction. A circular hole matching the circular through hole is provided in one of the areas, and the other adjacent area is used as an inner seal of the conical valve.

[0047] In this embodiment, in order to achieve a soft sealing effect, the upper and lower parts of the side surface of the valve core cone are respectively provided with annular positioning flanges 36 corresponding to the upper and lower sealing rings, and a positioning protrusion 37 corresponding to the sealing strip is provided between the positioning flanges, which divides the side surface of the cone into four areas along the circumferential direction. The circular through hole is provided in one of the areas, and n small holes communicating with the cone-shaped cavity are provided in the other three areas. The valve sleeve is wrapped on the cone by injection molding, and the inner and outer sides of the valve sleeve are connected through small holes.

[0048] In this embodiment, in order to achieve a soft sealing effect, the upper sealing ring, lower sealing ring and sealing strip on the outer side of the valve sleeve are integrally formed with the valve sleeve during injection molding, and the sealing surfaces formed by the upper sealing ring, lower sealing ring and sealing strip are located on the same conical surface.

[0049] In this embodiment, the ratio of the self-tightening force bearing area S2 of the truncated cone to the sealing surface area S1 is greater than 1.35.

[0050] In this embodiment, in order to achieve self-compensation after wear, a wear compensation gap 60 is reserved between the truncated cone bottom surface of the valve core and the truncated cone-shaped chamber.

[0051] In this embodiment, in order to ensure the sealing effect between the valve body and the valve cover, a sealing groove is further provided on the annular platform of the main valve body for cooperating with the valve cover, and a sealing ring 13 is provided in the sealing groove. The valve body and the valve cover are connected via bolts 14 and gaskets 15.

[0052] In this embodiment, the valve core's own gravity makes the valve core and the truncated cone-shaped chamber fit together at all times, thereby forming an initial sealing pressure ratio. The elastic force generated by the magnetic blocks with the same magnetic poles and the same direction as the gravity of the valve core strengthens the pre-tightening effect between the valve core and the truncated cone-shaped chamber. During the opening and closing process of the truncated cone valve, the medium pressure P acts on the self-tightening force-bearing surface of the valve core truncated cone, so that the sealing pressure ratio on the sealing surface exceeds the medium pressure by more than 1.35 times. Regardless of how the medium pressure changes, the truncated cone valve can maintain a good sealing effect. Due to the conical surface fit, the more the truncated cone valve sealing surface is worn, the smoother it becomes, and the better the fit. After wear occurs, under the action of the valve core's gravity and the medium pressure, the valve core automatically moves downward, and continues to maintain its close fit with the chamber, so that the truncated cone valve has a reliable sealing effect and a long service life.

[0053] In this embodiment, the processing and assembly method of the fully self-tightening truncated cone valve includes the following steps:

[0054] (1) Prefabricated valve body, valve cover and valve core;

[0055] (2) The valve core cone is lined with a soft sealing material such as PFA by injection molding, and the sealing surface of the one-piece valve sleeve is precision machined to ensure that the taper and roughness meet the sealing requirements;

[0056] (3) Install the valve core in the truncated cone-shaped chamber of the valve body, ensuring that the truncated cone of the valve core fits against the chamber wall by its own weight, and the cylindrical valve stem of the valve core passes through the valve body and is connected to the drive device below;

[0057] (4) The compression ring is locked in the valve body by means of bolts and washers so that the annular magnetic block is always in contact with the upper bottom surface of the valve core.

[0058] (5) Connect and seal the valve body and valve cover with bolts and gaskets.

[0059] refer to Figures 1 to 6

[0060] The stress condition of the valve core of the round table valve in the pipeline is shown in Figure 1-Figure 4 Among them, F--the force of the medium on the valve core, f--the friction between the valve core and the valve seat, N--the reaction force of the valve seat on the valve core, P--the medium pressure, β--the cone angle of the cone, here, the gravity and magnetic elastic force formed by the valve core are negligible.

[0061] The various forces acting on the frustum valve core have the following relationship: F= 2N (sin β+ γ cos β).

[0062] If the friction coefficient γ between the valve core and the valve seat is 0.1, the cone angle of the frustum is 38°, the sealing surface area is S1, and the force area of ​​the frustum bottom is S2, then N=1.19F. Since F=pS2, N=1.19 pS2.

[0063] For soft-sealed valves, the prerequisite for sealing is: N / S1≥ 1.6P, that is, S2≥1.35S1.

[0064] For hard-sealed valves, the prerequisite for sealing is: N / S1≥ 3.2P, that is, S2≥2.69 S1.

[0065] In this embodiment, see Figure 3-Figure 6 , where R1--the radius of the lower bottom surface of the valve core cone, which is also the radius of the lower bottom surface of the lower sealing ring, R2--the radius of the upper bottom surface of the lower sealing ring, R3--the radius of the lower bottom surface of the upper sealing ring, R4--the radius of the upper bottom surface of the upper sealing ring, which is also the radius of the upper bottom surface of the valve core cone, H--the height of the valve core cone, B--the width of the sealing ring and the width of the sealing strip, S1--the area of ​​the valve core sealing surface, S11--the area of ​​the sealing ring under the valve core, S12--the area of ​​the sealing ring on the valve core, S13--the area of ​​the sealing strip 4 of the valve core, S2--the self-tightening force area of ​​the valve core cone, S21--the area of ​​the valve core cone without self-tightening force, S--the area of ​​the lower bottom surface of the valve core cone.

[0066] The bottom area of ​​the valve core cone is S=πR1²

[0067] Sealing surface area S1 = S11 + S12 + S13 = πB (R1 + R2) + πB (R3 + R4) + 4B (H / cos-2B)

[0068] =πB(R1+R2+R3+R4)+4B(H / cosβ-2B)

[0069] The self-tightening force area of ​​the valve stem round table S2 = S-S21

[0070] =πR1²- [(πR2 ²-πR3 ²) / 2 +2B(H / cosβ-2B)]

[0071] =π(R1²- ½R2²+ ½R3²) +2B(H / cosβ-2B)

[0072] For DN50 soft seal round table valve R1=49.00 R2=48.02 R3=25.88 R4=24.90

[0073] H=70.00 B=3.00 β=19°

[0074] S1= πB(R1+R2+R3+R4)+4B(H / cosβ-2B)

[0075] =3.14×3.00×(49.00+48.02+25.88+24.90)+4×3.00×(70.00 / 0.9455-2×3.00)

[0076] =2208.64

[0077] S2 = π(R1²- ½R2²+ ½R3²) +2B(H / cosβ-2B)

[0078] =5331.76

[0079] S2 =2.41S1≥1.35S1 meets the fully self-tightening sealing conditions of the soft sealing valve.

[0080] For DN50 hard-seal truncated cone valve, B=2.00, R2=48.35, R3=25.55, other data remain unchanged;

[0081] S1=1488.46 S2=5173.96

[0082] S2 =3.57S1≥2.69S1 meets the fully self-tightening sealing conditions of the hard sealing valve.

[0083] For soft-sealed and hard-sealed truncated cone valves of various specifications, by reasonably designing the structural dimensions of R1, R2, R3, R4, H, B, and β, the ratio of S2 to S1 can meet the prerequisite of self-tightening sealing.

[0084] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A processing and assembly method of a fully self-tightening truncated cone valve, comprising a valve body, a valve cover and a valve core, characterized in that: The valve body is laterally provided with an inlet channel and an outlet channel, and is longitudinally provided with an upper through hole connected to the inlet channel and a truncated cone-shaped chamber connected to the outlet channel and provided with a columnar through hole at the bottom, the valve core is installed in the truncated cone-shaped chamber, the upper part of the valve core is a truncated cone, and the lower part is a valve stem, the stem of the valve stem passes through the valve body and is connected to the driving device, the truncated cone is provided with a truncated cone-shaped cavity and a circular through hole passing through the side, a sealing mechanism is provided between the outer side surface of the truncated cone and the truncated cone-shaped chamber, a pressure ring is provided on the upper end surface of the truncated cone-shaped chamber, and a magnetic elastic mechanism that gives the valve core an axial downward thrust is provided under the pressure ring; the magnetic elastic mechanism includes a positioning groove provided on the pressure ring, and a pair of annular magnetic blocks with the same magnetic poles on the mating surfaces are provided on the positioning groove, and the annular magnetic block located on the lower side abuts against the upper bottom surface of the valve core truncated cone; comprising the following steps: (1) Prefabricate the valve body, valve cover and valve core. After machining, the sealing surface formed by the truncated cone chamber of the valve body and the truncated cone of the valve core is hardened by spraying, nitriding or ion plating, and the hardened layer of the sealing surface is ground and polished by machinery; (2) The valve core cone is lined with a valve sleeve using a soft sealing material by injection molding, and the one-piece valve sleeve sealing surface is fine-machined using a precision lathe; (3) The valve core is installed in the truncated cone-shaped chamber of the valve body, and the cylindrical valve stem of the valve core passes through the valve body and is connected to the driving device below; (4) Tighten the compression ring in the valve body with bolts and washers so that the annular magnetic block always contacts the upper bottom surface of the valve core; (5) Connect and seal the valve body and valve cover with bolts and gaskets.

2. A processing and assembly method of a fully self-tightening truncated cone valve according to claim 1, characterized in that: The upper end surface of the upper through hole is provided with an annular platform connected with the valve cover.

3. A processing and assembly method of a fully self-tightening truncated cone valve according to claim 1 or 2, characterized in that: The sealing mechanism includes an upper sealing ring and a lower sealing ring arranged on the upper and lower parts of the outer side of the truncated cone, a sealing strip is arranged between the upper sealing ring and the lower sealing ring to divide the side surface of the truncated cone into four areas along the circumferential direction, and the circular through hole is arranged in one of the areas.

4. A method for machining and assembling a fully self-tightening truncated cone valve according to claim 3, characterized in that: The upper sealing ring, the lower sealing ring and the sealing strip on the outer side surface of the truncated cone are integrally formed with the valve core, and the sealing surfaces of the upper sealing ring, the lower sealing ring and the sealing strip are located on the same conical surface.

5. A processing and assembly method of a fully self-tightening truncated cone valve according to claim 1 or 2, characterized in that: The sealing mechanism includes a truncated cone-shaped hollow valve sleeve wrapped around the valve core truncated cone, an upper sealing ring and a lower sealing ring are arranged on the upper and lower parts of the outer side surface of the valve sleeve, a sealing strip is arranged between the upper sealing ring and the lower sealing ring and divides the truncated cone side surface into four areas along the circumferential direction, and a circular hole matching the circular through hole is arranged in one of the areas.

6. A method for machining and assembling a fully self-tightening truncated cone valve according to claim 5, characterized in that: The upper and lower parts of the side surface of the valve core cone are respectively provided with annular positioning flanges corresponding to the upper and lower sealing rings, and a positioning protrusion corresponding to the sealing strip is provided between the positioning flanges, which divides the side surface of the cone into four areas along the circumferential direction. The circular through hole is provided in one of the areas, and n small holes communicating with the cone-shaped cavity are provided in the other three areas. The valve sleeve is wrapped on the cone by injection molding, and the inner side and outer side of the valve sleeve are connected through small holes.

7. The processing and assembly method of a fully self-tightening truncated cone valve according to claim 5 is characterized in that: The upper sealing ring, the lower sealing ring and the sealing strip on the outer side of the valve sleeve are integrally formed with the valve sleeve during injection molding, and the sealing surfaces formed by the upper sealing ring, the lower sealing ring and the sealing strip are located on the same conical surface.

8. A method for machining and assembling a fully self-tightening truncated cone valve according to claim 1, 4, 6 or 7, characterized in that: The ratio of the self-tightening force bearing area of ​​the truncated cone to the sealing surface area is greater than 1.35.

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