CN113915382A - Improved check valve for rail transit vehicles and method of manufacture - Google Patents
Improved check valve for rail transit vehicles and method of manufacture Download PDFInfo
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- CN113915382A CN113915382A CN202010653134.9A CN202010653134A CN113915382A CN 113915382 A CN113915382 A CN 113915382A CN 202010653134 A CN202010653134 A CN 202010653134A CN 113915382 A CN113915382 A CN 113915382A
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 35
- 230000006835 compression Effects 0.000 claims abstract description 14
- 238000007906 compression Methods 0.000 claims abstract description 14
- 238000004891 communication Methods 0.000 claims description 5
- 238000003801 milling Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 238000013016 damping Methods 0.000 description 4
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- 238000004880 explosion Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
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- 238000003754 machining Methods 0.000 description 2
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- 230000002411 adverse Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
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- 238000013022 venting Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/06—Check valves with guided rigid valve members with guided stems
- F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
Abstract
The present invention relates to an improved check valve for rail transit vehicles and a method of manufacture. The check valve includes: the valve body comprises a valve seat, the valve cover comprises a guide hole, the guide hole is provided with an opening only at one end, the valve clack comprises a valve head and a valve cone, the valve cone is movably received in the guide hole at least partially through the opening, the outer diameter of the valve cone is basically equal to the inner diameter of the guide hole so as to define a longitudinal central axis, a compression spring is arranged between the valve clack and the valve cover and surrounds the outer wall of the guide hole, the outer surface of the valve cone or the inner surface of the guide hole is provided with a material removing part, so that gas in an air chamber formed between the valve cone and the guide hole can be partially discharged through the material removing part in the direction opposite to the movement of the valve cone when the valve cone moves in the direction of entering the guide hole, and meanwhile, the pressure difference between the inside of the air chamber and the outside of the air chamber is basically maintained.
Description
Technical Field
The present invention relates to an improved check valve for rail transit vehicles and a method of manufacture.
Background
At present, check valves are widely used in rail transit vehicles, for example in pipelines involving piston gas compressors (such as VV120 type wind sources), in particular at the rear end (downstream) of the piston gas compressor.
In the case of compressed gas, a pressure gas flow enters from the inlet of the check valve, acts on the flap, opening the valve seat against the reaction force, whereby the check valve opens and the pressure gas flow exits from the outlet. The valve seat cannot be opened from the outlet to the inlet in the reverse direction, and therefore, the valve seat is not stopped.
Because of the characteristics and principle of the piston compressor, the compressed gas is not smooth and forms a stream of pressure gas flow, so that the valve clack moves up and down continuously when the pressure gas flow passes through.
The applicant has found that the check valve, in addition to the compression spring, forms an air chamber which both acts as a cushion and protection for the flap.
However, the check valve downstream of the piston compressor generates high frequency noise during its operation, which can be objectionable.
Disclosure of Invention
The invention is therefore based on the object of providing a solution which allows to effectively reduce or even eliminate high frequency noise and which advantageously maintains the above mentioned buffering and protection functions.
According to the invention, this object is achieved by providing a check valve comprising: a valve body, a valve clack, a valve cover, an inlet and an outlet arranged on the valve body,
the valve body comprises a valve seat,
the valve cover includes a guide hole having an opening only at one end,
the valve clack comprises a valve head and a valve cone,
the valve flap is operable to urge the valve head against the valve seat to disconnect the inlet and outlet ports from communication, the valve flap is further operable to urge the valve head away from the valve seat to allow the inlet and outlet ports to communicate,
a valve cone is movably received at least partially in the guide bore via the opening, an outer diameter of the valve cone being substantially equal to an inner diameter of the guide bore, thereby defining a longitudinal center axis,
the compression spring is arranged between the valve clack and the valve cover and surrounds the outer wall of the guide hole,
the non-return valve is characterized in that the outer surface of the valve cone or the inner surface of the guide hole is provided with a material removal, so that the gas in the gas chamber formed between the valve cone and the guide hole when the valve cone moves in the direction into the guide hole can be partly discharged via the material removal in the direction opposite to the movement of the valve cone, while substantially maintaining a pressure difference between the inside and the outside of the gas chamber.
Before measures to solve the problem can be found, a great deal of research must be carried out on the structural details and the working principle of the check valve.
It can be seen that the mechanism of such a check valve is relatively intuitive, and mainly the flap and compression spring move and displace during the passage of the high pressure gas compressed by the piston compressor. For this reason, when searching for the source of the abnormal sound generated by the passage of the compressed gas, the main focus is on the moving parts and the parts in contact therewith.
The applicant has first noted that such noise is not a component impact sound, and therefore the contact between the valve head and the valve seat for breaking the communication is not a source of noise.
In order to verify whether the compressed gas passes through the compression spring and the abnormal sound caused by the frequent displacement action of the compression spring, the following test verification is firstly performed:
the abnormal sound cannot be eliminated or improved by replacing the spring;
the abnormal noise is not eliminated or improved by coating lubricating grease on the surface of the spring.
The applicant has thus realised that the movement of the compression spring is also not a source of noise.
Then, in response to the abnormal sound problem, it will likely occur between such a pair of relatively moving parts, the valve flap and the valve cover, particularly between the valve cone of the valve flap and the guide hole of the valve cover.
The applicant has realised that in practice a gas chamber is formed between the valve cone and the guide bore, which will be strongly pressurised and depressurised during the vigorous reciprocating movement, thereby generating a certain reaction force and thus a certain cushioning effect. However, during this process, the negative pressure and the positive pressure are switched rapidly, and unstable sudden changes occur in the air chamber. Particularly in the case of a gas compressed in a gas chamber, such unstable transients tend to diffuse with a certain initial momentum into any accessible space. Here, the valve cone and the guide bore are at least not in an interference fit relationship, so that high pressure gas can pass through possible gaps between the valve cone and the inner wall of the guide bore. However, the discharge path of such a gap is not a path for efficient and rapid discharge of the gas in the gas chamber. As a result, a gas burst noise is generated. Thus, during the process of a burst of compressed gas entering from the inlet to the outlet, the gas explosion caused by the frequent reciprocating up-and-down movement of the valve cone within the guide bore is a source of the high frequency noise.
As described above, the valve cone and the pilot bore cannot be in a complete open-fitting relationship (e.g., the outer diameter of the valve cone is smaller than the inner diameter of the pilot bore) because the cushioning effect of the air chamber is always ensured. However, the valve cone and the pilot bore cannot be in a completely, especially sealed, tight-fitting relationship (e.g., the frictional force at the interface between the valve cone and the pilot bore would be dissipative resistance).
This is the reason for the present invention, because it is based on the novel recognition that the high frequency noise generated in the check valve during operation is caused by the explosion of gas generated by the compression of the air chamber formed between the valve cone and the guide hole when the valve cone moves, thereby solving such a problem on the premise that the cushioning effect of the air chamber is substantially secured.
According to some embodiments of the invention, the material removal portion extends longitudinally along a length of an outer surface of the valve cone or an inner surface of the guide bore.
According to some embodiments of the invention, the material removal portion forms a platform substantially parallel to the longitudinal central axis.
According to some embodiments of the invention, the material removal portion, preferably the platform, is open in plurality in the circumferential direction along the outer circumference of the valve cone or the inner circumference of the guide bore.
According to some embodiments of the invention, the material removal portions, preferably the lands, are evenly distributed in the circumferential direction along the outer circumference of the valve cone or the inner circumference of the guide bore.
According to some embodiments of the invention, the material removing portion, preferably the land, is provided three at equal angles of 120 ° in the circumferential direction along the outer circumference of the valve cone or the inner circumference of the pilot hole.
According to some embodiments of the invention, the width of the platform is about 2.5mm to 3.5mm, particularly preferably about 3mm, or the ratio of the width of the platform to the outer diameter of the valve cone is about 0.15 to 0.25, particularly preferably about 0.2.
According to some embodiments of the invention, the check valve further comprises a seal disposed between the bonnet and the valve body.
According to some embodiments of the invention, the valve cover is a plug screw and the valve body comprises receiving threads.
According to some embodiments of the invention, the check valve further comprises a thread protection cap provided at the outlet and/or the inlet.
According to the present invention, the object is also achieved by providing a method of manufacturing a check valve, comprising: providing a check valve, the check valve comprising: a valve body, a valve clack, a valve cover, an inlet and an outlet arranged on the valve body,
the valve body comprises a valve seat,
the valve cover includes a guide hole having an opening only at one end,
the valve clack comprises a valve head and a valve cone,
the valve flap is operable to urge the valve head against the valve seat to disconnect the inlet and outlet ports from communication, the valve flap is further operable to urge the valve head away from the valve seat to allow the inlet and outlet ports to communicate,
a valve cone is movably received at least partially in the guide bore via the opening, an outer diameter of the valve cone being substantially equal to an inner diameter of the guide bore, thereby defining a longitudinal center axis,
the compression spring is arranged between the valve clack and the valve cover and surrounds the outer wall of the guide hole,
the method is characterized in that a material removal is machined into the outer surface of the valve cone or into the inner surface of the guide hole, so that the gas in the gas chamber formed between the valve cone and the guide hole when the valve cone moves in the direction into the guide hole can be partially discharged through the material removal in the opposite direction to the movement of the valve cone, while substantially maintaining a pressure difference between the inside of the gas chamber and the outside of the gas chamber.
According to some embodiments of the invention, the material removal is obtained by milling.
Preferably, the features described above in relation to the non-return valve are also obtained by the method according to the invention.
In the improved check valve and manufacturing method for rail transit vehicles according to the present invention, the applicant has noted in particular that, although the material removal on the outer surface of the valve cone or on the inner surface of the pilot hole can be carried out substantially conveniently, the situation on the outer surface of the valve cone is more advantageous with respect to the machining process and costs than the situation on the inner surface of the pilot hole. It is therefore particularly preferred that the material removal is provided on the outer surface of the valve cone.
Drawings
Examples of embodiments of the invention are described in more detail below with reference to the accompanying drawings, in which:
FIG. 1 shows a schematic cross-sectional view of a check valve according to some embodiments of the invention.
Fig. 2 illustrates an exploded perspective view of main portions of a check valve according to some embodiments of the present invention.
FIG. 3 illustrates a side view of a valve flap of a check valve according to some embodiments of the invention.
FIG. 4 illustrates a top view of a flap of a check valve according to some embodiments of the invention.
Fig. 5A-5B illustrate partial schematic views of check valves according to some comparative examples.
Detailed Description
In connection with this specification, the terminology used in the related publications and patents is also used. It should be noted, however, that these terms are used only to facilitate understanding. The spirit of the invention and the scope of the claims should not be limited in interpretation by the specific choice of terms. The present invention may be readily transferred to other conceptual systems and/or fields. In other areas of expertise, these terms should be applied similarly.
Referring to FIG. 1, a schematic diagram of a check valve 100 is shown, according to some embodiments of the invention. The check valve 100 includes: the valve comprises a valve body 1, a valve clack 2, a valve cover 3, an inlet P1 and an outlet P2, wherein the inlet P1 and the outlet P2 are arranged on the valve body 1. The valve body 1 comprises a valve seat 11. The valve cover 3 includes a guide hole 31, and the guide hole 31 has an opening 32 only at one end. The valve flap 2 comprises a valve head 21 and a valve cone 22. The flap 2 is operable to urge the valve head 21 against the valve seat 11 to disconnect the inlet P1 from the outlet P1, and the flap 2 is also operable to move the valve head 21 away from the valve seat 11 to connect the inlet P1 to the outlet P1. The valve cone 22 is movably received at least partially in the guide bore 31 via the opening 32, the outer diameter of the valve cone 22 being substantially equal to the inner diameter of the guide bore 31, thereby defining a longitudinal center axis X-X. The compression spring 4 is disposed between the valve flap 2 and the valve cover 3 and surrounds the outer wall of the guide hole 31. Specifically, the compression spring 4 engages the wall of the valve cover 3 at one end and the valve head 21 at the other end opposite the face contacting the valve seat 11.
The check valve 100 according to the invention is designed for rail vehicles, for example for use in pipelines involving piston gas compressors (for example of the VV120 type), in particular at the rear end (downstream) of the piston gas compressor. Thus, it will be compressed air that flows through the check valve 100.
The check valve 100 shown in fig. 1 is a horizontal check valve. The inlet P1 and the outlet P2 are both substantially horizontally open and are located on opposite sides of the valve body 1, respectively. The bonnet 3 is located at a substantially top center position of the valve body 1. Thus, the check valve 100 has an overall substantially inverted T-shaped configuration. The flow of air enters the check valve 100 from the inlet P1, is deflected from generally horizontal to generally upward along the first curved path, pushes the valve head 21 away from the valve seat 11, thereby bypassing the valve head 21 to the second curved path, is deflected from generally upward to generally downward slope along the second curved path, and finally exits the check valve 100 from the outlet P2 generally horizontally. Thus, the valve head 21, in combination with the valve seat 11, defines two curved channels of the inner cavity of the check valve 100. Conversely, the incoming (e.g. reverse) airflow from outlet P2 will act on the upper surface of valve head 21, with the result that valve head 21 still abuts valve seat 11 and cannot move further upstream against it. Thus, the check valve 100 may also be referred to as a one-way valve, and the arrows in the figures also indicate such unidirectionality.
According to the invention, the outer surface of the valve cone 22 or the inner surface of the guide hole 31 is provided with a material removal (not shown in fig. 1) so that the gas in the gas chamber formed between the valve cone 22 and the guide hole 31 can be partly discharged via the material removal in the opposite direction to the movement of the valve cone (downwards in the illustration) when the valve cone 22 is moved in the direction into the guide hole (upwards in the illustration), while substantially maintaining a pressure difference between inside and outside the gas chamber. In other words, there is communication between the inside and outside of the chamber at the material removal portion, while the gas inside the chamber still generates an effective reaction force, i.e. still has a cushioning effect. Importantly, this advantageously reduces or even eliminates high frequency noise, particularly gas burst noise.
As mentioned above, the applicant has recognised the origin of high frequency noise, aiming to reduce or even eliminate it, while maintaining the advantageous damping function of the check valve itself.
From the force analysis, when the pressure air flow enters from the inlet P1 to pass through the valve clack 2 to reach the outlet P2, the valve clack 2 is subjected to the following forces: air thrust at the lower part, spring restoring force at the upper part, reacting force of the air chamber and gravity of the valve clack.
When F (air flow thrust) -mg (valve flap gravity) -F (spring restoring force) -F (air chamber reaction force) >0, the valve flap 2 rises.
When F (airflow thrust) -mg (flap gravity) -F (spring restoring force) -F (chamber reaction force) <0, the flap 2 is lowered.
Of course, the valve flap 2 also needs to overcome potential friction forces when ascending and descending.
Based on the reciprocating staged wind supply characteristics of a VV120 type wind source such as described above, F (airflow thrust) may fluctuate, causing the valve flap 2 to lift between closed, open, or any intermediate position.
There will also be a change in magnitude of F (spring return force) and F (chamber reaction force) due to the movement of the valve flap 2.
The applicant has noted that the response of F (spring return force) is substantially linear, i.e. proportional to the amount of deformation, but is generally less affected in possible transient drastic changes of the air flow. For F (air chamber reaction force), i.e. the damping action of the air chamber, this is achieved by the cooperation between the valve flap 2 and the valve cover 3, in particular the valve cone 22, in the guide bore 31. The air chamber is targeted and the varying resultant force acts on it, which in turn generates a reaction force. The resultant force of this variation is in particular due to the varying F (airflow thrust). The (reaction) action (response) of the air chamber is more pronounced when the valve flap 2 is in close contact with the valve cover 3, in particular when the valve cone 22 is in close contact with the inner wall of the guide bore 31.
As analyzed above, a high frequency response that mitigates F (gas cell reaction force) is considered and achieved such that unstable transients can be initially mitigated, but at the same time the advantageous presence of F (gas cell reaction force) is not substantially impaired.
Referring to fig. 2, there is shown an exploded perspective view of the main portions of the check valve 100 according to some embodiments of the present invention. Fig. 2 mainly shows a valve body 1, a valve flap 2, a valve cover 3, a compression spring 4, and a seal 5. A seal 5 is provided between the bonnet 3 and the valve body 1. Preferably, the bonnet 3 is a screw plug and the valve body 1 comprises a receiving thread arranged in a receiving hole. The screw plug is thus screwed to the receiving thread and is sealed with the valve body 1 by means of the seal 5.
Referring to fig. 3, a side view of the valve flap 2 of the check valve 100 is shown according to some embodiments of the invention. The material removal portion extends longitudinally along the length of the outer surface of the valve cone 22. The material removal forms a platform 200 substantially parallel to the longitudinal central axis X-X. Thus, the width W of the platform 200 is substantially constant along the length/longitudinal central axis X-X. This configuration not only satisfies the above-mentioned object, but also is economical and convenient in terms of manufacturing manner. For example, the platform 200 may be simply obtained by milling. In an embodiment, the overall height H of the valve flap 2 may be about 34mm, the outer diameter of the valve head 21 may be about D about 38mm, and the outer diameter D of the valve cone 22 may be about 15 mm.
Referring to fig. 4, a top view of the valve flap 2 of the check valve 100 is shown, according to some embodiments of the invention. Three lands 200-1, 200-2, 200-3 formed by material removal extending longitudinally along the length of the outer surface of the valve cone 22, substantially parallel to the longitudinal central axis X-X, are circumferentially disposed at equal angles of 120 ° along the circumference of the valve cone 22. In this way, the valve cone 22 and thus the valve flap 2 are also kept in equilibrium during the venting process, while the above-mentioned object is likewise achieved. For example, torsion and/or deflection do not readily occur.
The applicant has also studied in particular the effect of the width W of the platforms 200, 200-1, 200-2, 200-3 on the valve cone 22 on the retention of the damping and the elimination of the abnormal sounds. Surprisingly, applicants have found that a width W of the lands 200, 200-1, 200-2, 200-3 on the valve cone 22 of about 3mm has particularly good results.
The above description relates to the preferred embodiment in which the material removal portion is provided on the outer surface of the valve cone 22. Other embodiments are possible without departing from the spirit and scope of the present invention.
The applicant has additionally studied the cases of the comparative examples in comparison and found that they have a significant adverse effect on the cushioning function of the air cells.
Referring to fig. 5A-5B, partial schematic views of check valves according to some comparative examples are shown (with springs omitted for clarity). In the check valve of fig. 5A, a hole 500A is formed directly in the flap so that, after installation, the space above the valve cone communicates directly to the second tortuous path, and thus to the outlet. In the check valve of fig. 5B, a hole 500B is directly formed in the valve cover so that, after installation, the space inside the guide hole is directly communicated to the second curved path, and thus directly communicated to the outlet. Both of these comparative examples employ a pore scheme. Surprisingly, the applicant has found that even though such holes may improve the air burst, the cushioning function of the air chamber is greatly impaired and even there is a certain risk of failure. Once the cushioning effect of the air chamber fails, the upper surface of the valve flap and the valve cover may come into direct hard contact, and may stick together, which may cause the one-way passage function to fail, and may even affect safety. Therefore, the check valve 100 of the present invention does not have the above-described configuration. In other words, the check valve 100 of the present invention does not include at least an aperture provided in the valve flap 2 (e.g., the valve cone 22) and an aperture provided in the valve cover (e.g., the annular wall of the guide hole 31) through which the air chamber communicates with the outside (e.g., the inlet P1 and/or the outlet P2).
According to the present invention, there is also provided a method of manufacturing a check valve 100, comprising: providing a check valve 100, the check valve 100 comprising: the valve comprises a valve body 1, a valve flap 2, a valve cover 3, and an inlet P1 and an outlet P2 arranged on the valve body 1, wherein the valve body 1 comprises a valve seat 11, the valve cover 3 comprises a guide hole 31, the guide hole 31 has an opening 32 only at one end, the valve flap 2 comprises a valve head 21 and a valve cone 22, the valve flap 2 is operable to make the valve head 21 abut against the valve seat 11 to disconnect the inlet P1 and the outlet P2, the valve flap 2 is also operable to make the valve head 21 leave the valve seat 11 to make the inlet P1 and the outlet P2 communicate, the valve cone 22 is movably received in the guide hole 31 at least partially through the opening 32, the outer diameter of the valve cone 22 is substantially equal to the inner diameter of the guide hole 31 to define a longitudinal central axis X-X, and a compression spring 4 is arranged between the valve flap 2 and the valve cover 3 and surrounds the outer wall of the guide hole 31. According to the invention, the method comprises machining a material removal in the outer surface of the valve cone 22 or in the inner surface of the guide hole 31, so that the gas in the gas chamber formed between the valve cone 22 and the guide hole 31 when the valve cone 22 is moved in the direction into the guide hole can be partly discharged via the material removal in the opposite direction to the movement of the valve cone, while substantially maintaining a pressure difference inside and outside the gas chamber. Preferably, the material removal is obtained by milling.
Of course, the features described above in relation to the non-return valve 100 can also be obtained by the method according to the invention.
The use of the improved non-return valve and the production method according to the invention for rail vehicles allows high-frequency noise to be effectively reduced or even eliminated and the functions of damping and protection to be advantageously maintained.
The foregoing is illustrative of the present invention and is not to be construed as limiting thereof. Although exemplary embodiments of this invention have been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of this invention. Accordingly, all such modifications are intended to be included within the scope of this invention as defined in the claims. The invention is defined by the following claims, with equivalents of the claims to be included therein.
Claims (12)
1. A check valve, comprising: a valve body, a valve clack, a valve cover, an inlet and an outlet arranged on the valve body,
the valve body comprises a valve seat,
the valve cover includes a guide hole having an opening only at one end,
the valve clack comprises a valve head and a valve cone,
the valve flap is operable to urge the valve head against the valve seat to disconnect the inlet and outlet ports from communication, the valve flap is further operable to urge the valve head away from the valve seat to allow the inlet and outlet ports to communicate,
a valve cone is movably received at least partially in the guide bore via the opening, an outer diameter of the valve cone being substantially equal to an inner diameter of the guide bore, thereby defining a longitudinal center axis,
the compression spring is arranged between the valve clack and the valve cover and surrounds the outer wall of the guide hole,
characterized in that the outer surface of the valve cone or the inner surface of the guide hole is provided with a material removal portion, so that the gas in the gas chamber formed between the valve cone and the guide hole when the valve cone moves in the direction into the guide hole can be partially discharged through the material removal portion in the direction opposite to the movement of the valve cone, while substantially maintaining a pressure difference between the inside and the outside of the gas chamber.
2. The check valve of claim 1, wherein the material removal portion extends longitudinally along a length of an outer surface of the valve cone or an inner surface of the pilot bore.
3. The check valve according to claim 3, wherein the material removing portion is opened in plurality in a circumferential direction along an outer periphery of the valve cone or an inner periphery of the pilot hole.
4. The check valve of claim 4, wherein the material removal portions are evenly distributed in a circumferential direction along an outer circumference of the valve cone or an inner circumference of the pilot hole.
5. The check valve according to claim 5, wherein the material removing portion is provided three at an equal angle of 120 ° in a circumferential direction along an outer circumference of the valve cone or an inner circumference of the pilot hole.
6. The check valve of any of claims 2-5, wherein the material removal portion forms a platform substantially parallel to the longitudinal central axis.
7. The check valve of claim 6, wherein the width of the land is 2.5mm to 3.5mm, or the ratio of the width of the land to the outer diameter of the valve cone is 0.15 to 0.25.
8. The check valve of claim 7, wherein the width of the land is about 3 mm.
9. The check valve of any of claims 1-5, wherein the material removal portion is disposed on an outer surface of the valve cone.
10. The non-return valve according to any one of claims 1-5, wherein the non-return valve further comprises a seal arranged between the valve cap and the valve body, and/or wherein the valve cap is a screw plug and the valve body comprises receiving threads, and/or wherein the non-return valve further comprises a thread protection cap arranged at the outlet and/or the inlet.
11. A method of manufacturing a check valve according to any of claims 1-10, comprising: the check valve is characterized in that a material removal part is machined on the outer surface of the valve cone or the inner surface of the guide hole, so that the gas in the gas chamber formed between the valve cone and the guide hole can be partially discharged through the material removal part in the direction opposite to the movement of the valve cone when the valve cone moves in the direction of entering the guide hole, and meanwhile, the pressure difference between the gas chamber and the gas chamber is basically maintained.
12. The method of claim 11, wherein the material removal is obtained by milling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010653134.9A CN113915382A (en) | 2020-07-08 | 2020-07-08 | Improved check valve for rail transit vehicles and method of manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010653134.9A CN113915382A (en) | 2020-07-08 | 2020-07-08 | Improved check valve for rail transit vehicles and method of manufacture |
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| CN113915382A true CN113915382A (en) | 2022-01-11 |
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| CN202010653134.9A Pending CN113915382A (en) | 2020-07-08 | 2020-07-08 | Improved check valve for rail transit vehicles and method of manufacture |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050166971A1 (en) * | 2004-01-31 | 2005-08-04 | Gennady Arov | Y-pattern piston check valve, piston valve assembly for a Y-pattern piston check valve, and method |
| CN201610944U (en) * | 2010-03-30 | 2010-10-20 | 铁岭方众阀门有限公司 | Elevating type micro-damp slow closed check valve |
| CN202280885U (en) * | 2011-10-11 | 2012-06-20 | 浙江新化化工股份有限公司 | Lift check valve |
| CN104879538A (en) * | 2015-05-26 | 2015-09-02 | 大丰市南亚阀门有限公司 | Automatic check valve |
| JP2016044787A (en) * | 2014-08-26 | 2016-04-04 | 株式会社Ihi | Valve and pressure maintaining valve with non-return valve including the same |
| CN205446830U (en) * | 2016-03-23 | 2016-08-10 | 宇明阀门集团有限公司 | Shock attenuation non return case and use check valve of this non return case |
| CN206320362U (en) * | 2016-12-28 | 2017-07-11 | 胜利油田瑞特机械制造有限责任公司 | A kind of angle type check valve |
| CN208651714U (en) * | 2018-07-20 | 2019-03-26 | 上海国之鼎铁路机电有限公司 | Rail traffic pressure-control check valve |
-
2020
- 2020-07-08 CN CN202010653134.9A patent/CN113915382A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050166971A1 (en) * | 2004-01-31 | 2005-08-04 | Gennady Arov | Y-pattern piston check valve, piston valve assembly for a Y-pattern piston check valve, and method |
| CN201610944U (en) * | 2010-03-30 | 2010-10-20 | 铁岭方众阀门有限公司 | Elevating type micro-damp slow closed check valve |
| CN202280885U (en) * | 2011-10-11 | 2012-06-20 | 浙江新化化工股份有限公司 | Lift check valve |
| JP2016044787A (en) * | 2014-08-26 | 2016-04-04 | 株式会社Ihi | Valve and pressure maintaining valve with non-return valve including the same |
| CN104879538A (en) * | 2015-05-26 | 2015-09-02 | 大丰市南亚阀门有限公司 | Automatic check valve |
| CN205446830U (en) * | 2016-03-23 | 2016-08-10 | 宇明阀门集团有限公司 | Shock attenuation non return case and use check valve of this non return case |
| CN206320362U (en) * | 2016-12-28 | 2017-07-11 | 胜利油田瑞特机械制造有限责任公司 | A kind of angle type check valve |
| CN208651714U (en) * | 2018-07-20 | 2019-03-26 | 上海国之鼎铁路机电有限公司 | Rail traffic pressure-control check valve |
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