阅读说明：本技术 一种阀座、膜片式单向阀及膜片式单向阀的生产工艺 (Valve seat, diaphragm type one-way valve and production process of diaphragm type one-way valve ) 是由 王伟东 吕锋 朱玉华 于 2020-07-02 设计创作，主要内容包括：本发明提供一种阀座,阀座内设有第二孔段和第一孔段,第一孔段内安装有磁铁。第一孔段内位于磁铁两侧的内壁上分别设有限位环台和固定部,当磁铁松动时限位环台和固定部可以阻挡磁铁进而防止磁铁掉落。还提供一种膜片式单向阀,包括管体,管体内设有上述阀座、膜片、支架以及滤网,其中滤网与支架固定设置,膜片活动式设于支架与阀座之间。本发明还提供一种膜片式单向阀的生产工艺,用于生产上述膜片式单向阀。限位环台和固定部能够将磁铁限制于第一孔段内,防止磁铁错位或掉出,进而防止了膜片式单向阀失效。(The invention provides a valve seat, wherein a second hole section and a first hole section are arranged in the valve seat, and a magnet is arranged in the first hole section. Be equipped with spacing ring platform and fixed part on the inner wall that lies in magnet both sides in the first hole section respectively, spacing ring platform and fixed part can block magnet and then prevent that magnet from dropping when magnet is not hard up. Still provide a diaphragm formula check valve, including the body, be equipped with above-mentioned disk seat, diaphragm, support and filter screen in the body, wherein filter screen and support fixed setting, the diaphragm is movable to be located between support and the disk seat. The invention also provides a production process of the diaphragm type one-way valve, which is used for producing the diaphragm type one-way valve. Spacing ring platform and fixed part can prevent magnet dislocation or fall out with magnet restriction in first hole section, and then prevented diaphragm formula check valve inefficacy.)

1. The utility model provides a valve seat, is applied to diaphragm formula check valve, be provided with cyclic annular sealed face (36) on one of them side end face of valve seat, be equipped with the valve seat hole in the valve seat, its characterized in that, the valve seat hole is including being close to first hole section (330) of cyclic annular sealed face (36) one side and keeping away from second hole section (37) of cyclic annular sealed face (36) one side, the diameter of first hole section (330) is less than the diameter of second hole section (37), just be close to in first hole section (330) one side of cyclic annular sealed face (36) is equipped with spacing ring platform (33), first hole section is kept away from one side of cyclic annular sealed face (36) is equipped with fixed part (34) that can buckle.

2. Valve seat according to claim 1, wherein a gap (35) is provided between the fixing portion (34) and the inner wall of the second bore section (37).

3. The valve seat according to claim 2, characterized in that the valve seat comprises a fixing section (31) and a positioning section (30), the outer diameter of the positioning section (30) is larger than that of the fixing section (31), and at least two rows of ring grooves (32) are circumferentially arranged on the outer circumferential wall of the fixing section (31).

4. A diaphragm-type check valve, comprising at least:

a pipe body (1);

the valve seat of claim 3, fixedly mounted within the body, and a magnet (2) fixedly mounted within the first bore section (330); the fixing part (34) is bent inwards, and the magnet (2) is positioned between the fixing part (34) and the limit ring table (33);

the support (4) is fixedly arranged in the pipe body (1), and the support (4) is positioned on one side of the valve seat, which is provided with an annular sealing surface (36);

the diaphragm (5) is movably connected between the support (4) and the annular sealing surface (36), and the diaphragm (5) completely covers the annular sealing surface (36) after being in contact with the annular sealing surface (36).

5. The diaphragm check valve as claimed in claim 4, wherein the tube (1) is provided with a neck portion (11) at a position corresponding to the fixing portion (31), and the neck portion (11) presses the outer circumferential surface of the portion of the fixing portion (31) where the annular groove (32) is provided to achieve the sealing fixation of the valve seat.

6. The diaphragm check valve as claimed in claim 5, wherein said neck portion (11) is provided on its outer peripheral surface with a plurality of ribs (12) extending axially along said tubular body (1).

7. The diaphragm type check valve as claimed in claim 6, wherein said support (4) comprises at least two columns (41) uniformly arranged along the circumference of said support (4), said columns (41) are provided with column blocking surfaces (410) facing one side of said valve seat (3), and said diaphragm (5) is movably connected between said column blocking surfaces (410) and said valve seat (3).

8. The diaphragm type check valve as recited in claim 7, further comprising a filter screen (3), wherein a filter screen hoop (61) is fixedly connected to an outer peripheral surface of the filter screen (3), and the filter screen (3) is fixedly disposed on a side of the valve seat (3) away from the support (4).

9. The diaphragm type check valve as recited in claim 8, wherein the tube body (1) is provided with a plurality of fixing grooves (13) at positions close to the filter screen hoop (61) and the support (4), the filter screen hoop (61) is located between the fixing grooves (13) and the valve seat and is pressed and fixed by the fixing grooves (13) and the valve seat, and the support (4) is located between the fixing grooves (13) and the valve seat and is pressed and fixed by the fixing grooves (13) and the valve seat.

10. A process for producing a diaphragm check valve for producing the diaphragm check valve of claim 9, comprising at least the steps of:

s1: processing and producing the pipe body, the valve seat, the magnet, the membrane, the bracket and the filter screen, wherein the annular sealing surface (36) is arranged on the end surface of one side of the valve seat (3), a second hole section (37) and a first hole section (330) are arranged in the valve seat (3), and the first hole section (330) is positioned on one side close to the annular sealing surface (36); the limiting ring table (33) is arranged on one side, close to the annular sealing surface (36), in the first hole section (330), an unbent fixing part (34) is arranged on one side, far away from the annular sealing surface (36), of the first hole section (330), and a gap (35) is formed between the fixing part (34) and the inner wall of the valve seat hole;

s2: mounting the magnet (2) into the first hole section (330) from the second hole section (37) side, enabling one end of the magnet (2) to be in contact with a limit ring table (33), and then bending the fixing part (34) inwards through a stamping process to fix the magnet (2) in the first hole section (330);

s3: installing the valve seat into the pipe body (1), carrying out necking processing on the pipe body (1) to process a necking section (11) so as to fix the valve seat;

s4: installing the diaphragm (5) and the support (4) into the pipe body (1), wherein the diaphragm (5) is movably installed between the diaphragm and the support (4);

s5: will filter screen (6) with filter screen hoop (61) fixed connection, and will filter screen (6) install into in body (1), later on processing on body (1) is used for fixing fixed recess (13) of support (4) and filter screen hoop (61) for filter screen hoop (61) and support (4) are respectively by fixed recess (13) with the valve seat extrusion is fixed.

Technical Field

The invention relates to the field of one-way valves, in particular to a valve seat, a diaphragm type one-way valve and a diaphragm type one-way valve production process.

Background

The check valve is widely applied to the field of refrigeration equipment. Traditional check valve is provided with a mobilizable case and a fixed disk seat usually, has the disk seat hole that is used for supplying the gas circulation in the disk seat, when the air current moved towards one of them direction, thereby the disk seat was kept away from to the case does not provide sealed effect, and the case was driven when the air current moved towards another direction, and the case finally moves the position of blockking up the disk seat hole, and the check valve is blockked up this moment, and the unable circulation of air current has realized the effect that one-way dams. One type of prior art check valve is a diaphragm type check valve. The diaphragm type one-way valve has the advantages that the magnet is arranged in the valve seat hole, when no airflow circulates, the magnet can attract the diaphragm to cover the valve seat hole, and the diaphragm is positioned at the position of blocking the diaphragm type one-way valve when no airflow exists.

However, in current diaphragm formula check valve, magnet often is direct installs inside the valve seat hole through interference fit's mode, and in long-term use, the air current can impact magnet repeatedly, and magnet produces easily and becomes flexible even fall out from the valve seat downthehole, can influence the adsorption effect of magnet to the diaphragm on the one hand, if on the other hand magnet falls out partly too much, can disturb the diaphragm and cover the valve seat hole, and then can lead to diaphragm formula check valve to lose the one-way effect of damming.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: after the existing diaphragm type one-way valve is used for a long time, the magnet arranged inside is easy to loosen or even fall out due to the impact of air flow, so that the diaphragm type one-way valve is invalid, and the service life of the diaphragm type one-way valve is shortened.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

the invention firstly provides a valve seat which is applied to a diaphragm type one-way valve, wherein an annular sealing surface is arranged on one side end face of the valve seat, a valve seat hole is arranged in the valve seat, the valve seat hole comprises a first hole section close to one side of the annular sealing surface and a second hole section far away from one side of the annular sealing surface, the diameter of the first hole section is smaller than that of the second hole section, a limiting ring table is arranged on one side, close to the annular sealing surface, in the first hole section, and a bendable fixing part is arranged on one side, far away from the annular sealing surface, of the first hole section.

Preferably, a gap is formed between the fixing part and the inner wall of the second hole section.

Preferably, the valve seat includes canned paragraph and locating section, the external diameter of locating section is greater than the canned paragraph, it is equipped with two row at least annular grooves to encircle along circumference on the periphery wall of canned paragraph.

The present invention also provides a diaphragm type check valve, at least comprising: a pipe body; the valve seat is fixedly arranged in the tube body, and the magnet is fixedly arranged in the first hole section; the fixing part is bent inwards, and the magnet is positioned between the fixing part and the limiting ring table; the support is fixedly arranged in the pipe body and is positioned on one side of the valve seat, which is provided with the annular sealing surface; a diaphragm movably connected between the bracket and the annular sealing surface and covering the annular sealing surface.

Preferably, the pipe body corresponds the position of canned paragraph is equipped with the necking down section, the extrusion of necking down section be equipped with on the canned paragraph the peripheral face of annular part is in order to realize right the sealed fixed of disk seat.

Furthermore, a plurality of convex ribs extending along the axial direction of the pipe body are arranged on the peripheral surface of the neck reducing section.

Furthermore, the support at least comprises two stand columns which are uniformly arranged along the circumferential direction of the support, stand column blocking surfaces facing one side of the valve seat are arranged on the stand columns, and the diaphragm is movably connected between the stand column blocking surfaces and the valve seat.

Further, still include the filter screen, fixedly connected with filter screen hoop on the outer peripheral face of filter screen, the filter screen is fixed to be located the disk seat is kept away from one side of support.

Further, the body is close to the filter screen hoop with the position of support is equipped with a plurality of fixed recesses, the filter screen hoop is located fixed recess with between the disk seat and by fixed recess with the disk seat extrusion is fixed, the support is located fixed recess with between the disk seat and by fixed recess with the disk seat extrusion is fixed.

The invention also provides a production process of the diaphragm type one-way valve, which is used for producing the diaphragm type one-way valve and at least comprises the following steps:

s1: processing and producing the pipe body, the valve seat, the magnet, the diaphragm, the bracket and the filter screen, wherein the annular sealing surface is arranged on the end surface of one side of the valve seat, a second hole section and a first hole section are arranged in the valve seat, and the first hole section is positioned on one side close to the annular sealing surface; the limiting ring table is arranged on one side, close to the annular sealing surface, in the first hole section, an unbent fixing part is arranged on one side, far away from the annular sealing surface, of the first hole section, and a gap is formed between the fixing part and the inner wall of the valve seat hole;

s2: installing the magnet into the first hole section from one side of the second hole section, enabling one end of the magnet to be in contact with the limiting ring table, and then bending the fixing part inwards through a stamping process to fix the magnet into the first hole section;

s3: installing the valve seat into the pipe body, carrying out necking processing on the pipe body, and processing the necking section to fix the valve seat;

s4: installing the diaphragm and the support into the tube body, wherein the diaphragm is movably installed between the diaphragm and the support;

s5: will the filter screen with filter screen hoop fixed connection, and will the filter screen is installed into in the body, later processing is used for fixing on the body the fixed recess of support and filter screen hoop makes filter screen hoop and support quilt respectively fixed recess with the disk seat extrusion is fixed.

The scheme has the following advantages:

1. the limiting ring platform and the fixing part can block the magnets from two sides respectively, and after the magnets are loosened, the limiting ring platform and the fixing part can block the magnets, so that the magnets are guaranteed to be located in the first hole section all the time, and the magnets are prevented from falling off.

2. In preferred scheme, the problem that it is difficult to conveniently install magnet under the condition that be equipped with spacing ring platform and fixed part has been solved in the setting in clearance, helps installing magnet more conveniently and processes spacing ring platform and fixed part more conveniently. Specifically, in the production process, the magnet is installed into the first hole section from one side of the second hole section, and the fixing part is not bent in the process, so that the installation of the magnet is not hindered. After the magnet is installed, the fixing portion is punched, for example, an extrusion tool is inserted into the gap, the fixing portion extending along the straight line originally is extruded and bent through pressure, and then the inner diameter of the first hole section at the position of the fixing portion is smaller than the length of the magnet, so that the fixing portion can limit the magnet. The scheme has simple processing operation and does not interfere the installation of the magnet.

3. In preferred scheme, the holistic sealing performance of diaphragm formula check valve is good, on the outer peripheral face position of disk seat in particular, the necking down section receives the extrusion back inner wall can be partly absorbed in the annular, forms multiunit line and seals, has both realized fixedly, has guaranteed the leakproofness again, and the pressurized area of necking down section is great in the course of working moreover, can also effectively avoid the body to be cut off by directly.

Drawings

FIG. 1 is a cross-sectional view of a preferred embodiment of a diaphragm check valve;

FIG. 2 is a schematic view of the exterior of the diaphragm check valve;

FIG. 3 is a schematic view of a valve seat;

FIG. 4 is a schematic view of the valve seat after the magnet is installed;

FIG. 5 is a schematic view of a stent;

FIG. 6 is a schematic view showing the mounting relationship between the diaphragm and the bracket;

FIG. 7 is a schematic view of a screen;

FIG. 8 is a schematic view showing the fixing portion pressed and bent by the insertion tool;

description of reference numerals: 1-a pipe body, 11-a neck-reducing section, 12-a convex rib, 13-a fixed groove, 2-a magnet, 3-a valve seat, 30-a positioning section, 31-a fixed section, 32-a ring groove, 33-a limit ring table, 330-a first hole section, 34-a fixed section, 35-a gap, 36-an annular sealing surface, 37-a second hole section, 4-a bracket, 41-a stand column, 410-a stand column blocking surface, 42-a bracket hole, 5-a membrane, 6-a filter screen and 61-a filter screen hoop.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, integrally connected, or detachably connected; may be communication within two elements; they may be directly connected or indirectly connected through an intermediate, and those skilled in the art will understand the specific meaning of the above terms in the present invention in specific situations.

A preferred embodiment of the diaphragm type check valve is shown in fig. 1, and at least comprises a tube body 1, wherein a filter screen 6, a valve seat 3, a diaphragm 5 and a support 4 are fixedly arranged in the tube body 1 from left to right in sequence, when airflow flows from left to right, the diaphragm 5 is pushed away from the valve seat 3, and the airflow normally circulates; when the airflow flows from right to left, the membrane 5 is pushed to cover the first hole section 330, so that the circulation of the airflow is cut off, and the unidirectional flow interception effect is achieved. In a preferred embodiment of the valve seat 3, as shown in fig. 3, a valve seat hole is formed in the valve seat 3, the valve seat hole includes a first hole section 330 and a second hole section 37, the first hole section 330 and the second hole section 37 are communicated with each other, and the air flow can flow along the first hole section 330 and the second hole section 37. The first hole section 330 is internally provided with the magnet 2, the magnetic pole direction of the magnet 2 faces the axial direction of the valve seat 3, the state after the magnet 2 is installed in the valve seat 3 is shown in fig. 4, and when the magnet 2 is selected, attention should be paid to the proper width of the selected magnet 2 to ensure that the normal circulation of air flow is not hindered. The inner wall of the first hole section 330 is respectively provided with a limit ring platform 33 and a fixing part 34 along the circumferential direction in a surrounding manner, the magnet 2 is arranged between the limit ring platform 33 and the fixing part 34, and the inner diameters of the limit ring platform 33 and the fixing part 34 are smaller than the length of the magnet 2. The magnet 2 is not normally moved. However, after the diaphragm type check valve is used for a long time, the magnet 2 is impacted by airflow for multiple times and may be loosened, at this time, although the magnet 2 moves, the length of the magnet 2 is still larger than the inner diameter of the limiting ring table 33 and the fixing portion 34, so that the limiting ring table 33 and the fixing portion 34 can respectively block the magnet 2 from two sides of the magnet 2, the magnet 2 is ensured not to fall out of the first hole section 330, and the problem that the diaphragm type check valve cannot be used due to the fact that the magnet 2 falls off is solved. The diameter of the first bore section 330 is smaller than that of the second bore section 37, which is mainly designed to facilitate the machining of the fixing portion 34. in the case that the diameter of the first bore section 330 is smaller than that of the second bore section 37, a step surface is formed between the first bore section 330 and the second bore section 37, and the fixing portion 34 can be conveniently machined by using the step surface.

The fixing portion 34 is bent and inclined inward as shown in fig. 3, and a gap 35 is provided between the fixing portion 34 and an inner wall of the second hole section 37. During processing, the limit ring table 33 is firstly processed, then the magnet 2 is extruded into the first hole section 330 from one side of the second hole section 37, then the extruded piece is inserted into the gap 35, in the inserting process, the fixing part 34 is extruded to be bent towards the axial direction, the inner diameter of the bent fixing part 34 is smaller than that of the first hole section 330, and the function that the fixing part 34 can block the magnet 2 is achieved.

Preferably, the valve seat 3 includes a fixing section 31, and at least two rows of ring grooves 32 are circumferentially formed on an outer circumferential surface of the fixing section 31. Meanwhile, the position of the pipe body 1 corresponding to the fixing section 31 is provided with the necking section 11, the necking section 11 is concave and extrudes the annular groove 32, the inner wall of part of the necking section 11 is sunk into the annular groove 32, and then the inner wall of the necking section 11 and the annular groove 32 form a multi-group line seal, so that the sealing performance and the fixing performance of the valve seat 3 at the position of the peripheral wall can be effectively improved. And because the neck section 11 extends for a certain length along the axial direction to form an extrusion surface, the pressure born by the extrusion of the pipe body 1 can be reduced during processing, and the pipe body 1 is prevented from being directly cut off. In order to improve the strength of the neck section 11, as shown in fig. 2, a plurality of ribs 12 are arranged on the neck section 11 along the axial direction of the pipe body 1, and the ribs 12 are uniformly arranged along the circumferential direction of the neck section 11.

Valve seat 3 still includes location section 30, and the external diameter of location section 30 is greater than the internal diameter of necking down section 11, and necking down section 11 can be blocked to location section 30, can provide the effect of location for necking down section 11 and valve seat 3 when installation and processing.

The structure of the support 4 is shown in fig. 5, the support 4 includes a support hole 42 provided at the center and four columns 41 uniformly arranged along the circumferential direction, and the columns 41 are provided with column blocking surfaces 410 facing one side of the valve seat 3. As shown in fig. 6, the membrane 5 is movably connected between the columns 41, and the columns 41 are uniformly arranged along the circumferential direction of the support 4, so that the membrane 5 is kept balanced when contacting with the column blocking surface 410, and the membrane 5 is prevented from being inclined by the impact of the airflow and then being clamped with the inner wall of the pipe body 1. As can be seen from fig. 1 and 6, when the gas flow flows from the left side to the right side of the tube 1, the gas flow pushes the diaphragm 5 away from the valve seat 3, the diaphragm 5 moves to a position contacting the pillar stopper surface 410, and the gas flows through the second hole section 37 and the first hole section 330, bypasses the diaphragm 5 in the direction indicated by the arrow in fig. 6, flows out along the bracket hole 42, and flows out from the right side of the tube 1; when the air current flows to the left side from the right side of the tube body 1, the air current blows the membrane 5 to cover the annular sealing surface 36, and the outer peripheral wall of the valve seat 3 and the inner wall of the tube body 1 are sealed, so that the air current cannot flow through the valve seat 3, and the one-way shutoff effect of the membrane type check valve is further realized.

In order to improve the sealing between the diaphragm 5 and the valve seat 3, an annular sealing surface 36 is further provided on the end surface of the valve seat 3 facing the diaphragm 5, and the air flow can blow the diaphragm 5 to press against the annular sealing surface 36 to seal the valve seat hole. At this time, because the contact area between the diaphragm 5 and the annular sealing surface 36 is smaller than that when the diaphragm is directly contacted with the end surface of the valve seat 3, the pressure generated when the diaphragm 5 and the annular sealing surface 36 are pressed against each other under the same air flow pressure is larger, and the sealing performance is better.

In order to prevent the gas flowing through the valve seat 3 from containing impurities, the filter screen 6 is fixedly connected to one side of the valve seat 3 far away from the membrane 5, and the gas firstly flows into the valve seat 3 after being preliminarily filtered by the filter screen 6 during flowing. In the prior art, the filter screen 6 is usually welded with the valve seat 3 directly, and this kind of scheme has the disadvantage that, when the product test is carried out, if the performance of the valve seat 3 does not reach the standard, the filter screen 6 is difficult to detach at this moment, and will destroy together with the valve seat 3, causing the waste of the filter screen 6, and increasing unnecessary cost. Consequently, in this scheme, filter screen 6 and filter screen hoop 61 fixed connection install filter screen 6 into body 1 in and fixed again, if the 3 performance of disk seat do not reach standard, only need pull down disk seat 3, and can not influence filter screen 6 and filter screen hoop 61, can effective reduction in production cost.

Because the support 4 is fixed without air tightness requirement, the pipe body 1 is provided with a plurality of fixing grooves 13 at the position close to the support 4 in the Shanghai, and the support 4 is fixed in a point extrusion mode.

The pipe body 1 can also be provided with a fixing groove 13 at the position corresponding to the filter screen hoop 61 to play the role of positioning and fixing.

In combination with the structure of the above solution, there is provided herein a preferred embodiment of a manufacturing process of a diaphragm type check valve, which at least includes the following steps:

s1: the tube body 1, the valve seat 3, the diaphragm 5, the support 4 and the filter screen 6 are formed by processing according to a conventional production method, and the magnet 2 is processed into a proper size.

For the production of the valve seat 3, externally, a positioning section 30 and a fixing section 31 are respectively formed on the valve seat 3, a plurality of rows of circumferential grooves 32 are formed on the fixing section 31, and the annular sealing surface 36 is formed on one side end surface of the valve seat 3; the second bore section 37 and the first bore section 330 are machined into the valve seat 3 on the inside, the first bore section 330 being located on the side close to the annular sealing surface 36. The side of the first bore section 330 close to the second bore section 37 is provided with an unbent fixing portion 34, and a gap 35 is provided between the fixing portion 34 and the valve seat bore, and the inner diameter of the fixing portion 34 is the same as the inner diameter of the first bore section 330. Meanwhile, the limit ring table 33 is finely turned on the side of the first hole section 330 far away from the second hole section 37;

s2: the magnet 2 is installed into the first hole section 330 from one side of the second hole section 37 until one end of the magnet 2 contacts the retainer ring land 33. After the magnet 2 is mounted, the fixing portion 34 is pressed, for example, by using the method shown in fig. 8, a pressing tool is pressed and inserted into the gap 35, and the fixing portion 34 is pressed to bend inward, so that the fixing portion 34 is finally formed to be bent obliquely as described above, so that the magnet 2 is fixed in the first hole section 330. The above process has an advantage that the fixing portion 34 is not bent to interfere with the installation of the magnet 2, and the fixing portion 34 has an inner diameter smaller than the length of the magnet 2 after the fixing portion 34 is bent, so that the fixing portion 34 can play a role of limiting the movement of the magnet 2, preventing the magnet 2 from falling into the second hole section 37, and not interfering with the installation of the magnet 2. Specifically, after the retainer ring 33 and the fixing portion 34 are finished, even if the magnet 2 moves in the first hole section 330, the magnet 2 can be stopped by the retainer ring 33 or the fixing portion 34 after moving to the retainer ring, and it can be ensured that the magnet 2 does not protrude outward and does not fall from the valve seat 3.

S3: it is right body 1 carries out necking down processing, processes out necking down section 11, necking down section 11 receive extrusion rear portion can be absorbed in annular 32 in, and fixed valve seat 3 keeps sealed between necking down section 11 and the valve seat 3 simultaneously. The necking process may be performed by direct molding using an extrusion die, and the rib 12 may be formed by the necking process by designing the shape of the extrusion die.

S4: the membrane 5 and the holder 4 are mounted in the tube 1, the membrane 5 being pressed against the annular sealing surface 36 by the attraction of the magnet 2 and at the same time completely covering the annular sealing surface 36.

S5: fixedly connecting a filter screen hoop 61 on the outer peripheral surface of the purchased filter screen 6, then installing the filter screen 6 into the pipe body 1, and processing the fixing groove 13 on the pipe body 1 for fixing the filter screen hoop 61. Then, a fixing groove 13 is processed on the pipe body 1 to fix the filter screen hoop 61. Compare in directly fixed with filter screen 6 directly with valve seat 3, this kind of scheme is simpler, and filter screen 6 is more convenient with valve seat 3's separation dismantlement moreover.

In conclusion, the above description is only for the preferred embodiment of the present invention and should not be construed as limiting the present invention, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.