Needle valve with back flush

专利摘要:
Needle valve for controlling a media flow and with a spindle (4) provided with a spindle tip (3) which can be contacted by axial downward movement against a contact surface for closing the medium through the valve from inlet (13) towards outlet (14) and which, in axial upward movement, allows flow of the medium, which needle valve (1) is further provided with a lower sealing structure including a bottom ring (5) or a scraper, around the spindle (4) to secure, that the medium does not flow upward in the structure.
公开号:DK201870124A1
申请号:DKP201870124
申请日:2018-02-26
公开日:2019-10-04
发明作者:Bolund Falkø Brian
申请人:Ev Metalværk A/S；
IPC主号:

专利说明:

Needle valve with rear flush
The present invention relates to a needle valve for controlling a flow of media and to a spindle provided with a spindle tip which can be contacted by axial downward movement against a contact surface for closing the medium through the valve from inlet to outlet, and which by axial upward movement, the medium is allowed to flow, which needle valve is further provided with a lower sealing structure, including a bottom ring, around the spindle to ensure that the medium does not flow upward in the structure.
Needle valves of the above type are used to control flow of media in a wide variety of areas. A particularly advantageous application is in connection with closure under very high pressures. The special design of the needle valve means that with a relatively low pressing force it is possible to ensure a tight closure even under such very high pressures (for example over 500 Bar). Often at such high pressures there will be a high risk of depositing material at the tip of the needle or spindle. When deposits on the spindle tip and spindle occur, it is most often due to the material crystallizing. The crystallized material may cause tearing of the seals. The high pressure can cause material to be pressed into gaps in gaskets and joints, and from this it is difficult to remove. It may cause tearing of seals and possibly be the cause of bacterial growth. It is thus an object of the invention to provide a structure which ensures that it is possible to clean the valve without having to disassemble the valve.
DK 2018 70124 A1
The object of the invention is met by means of a needle valve of the above-mentioned type, the needle valve being characterized in that the spindle tip can be pulled further upwards, thereby providing access for flushing fluid flowing from the flushing inlet, around the spindle tip and past the bottom or scraper, thereby .a. cleaning the outside of the spindle tip and the inside of the bottom ring or scraper.
This ensures that there is no need to separate the valve to clean it. Such a backwashing system is particularly advantageous, for example, for applications where hygienic requirements are set or where the primary medium, as mentioned, adheres to the spindle and seals, thereby causing increased wear on the seal.
According to an advantageous embodiment, the needle valve, as defined in claim 2, is designed such that the rinsing fluid flows out of either the inlet or outlet of the process medium or out of both. This also makes it possible to clean these channels with the rinse liquid.
In order to ensure that the rinse liquid cannot penetrate the structure, the embodiment of claim 3 is characterized in that a further sealing structure is placed around the spindle over the rinse inlet.
DK 2018 70124 A1
According to an advantageous embodiment, a non-return valve is located in the flushing fluid supply. This ensures that rinsing cannot occur if there is process medium under pressure in the valve.
According to the embodiment of claim 5, the needle valve is configured such that the seal upwards, when the valve is in the open state, is secured by a sealing ring located around the spindle between the bottom ring and the intermediate bushing. This sealing ring may advantageously be made of PTFE. According to claim 5, an uncomplicated and inexpensive construction is obtained.
According to a further advantageous embodiment, the needle valve according to the invention is characterized in that the seal upwards, when the valve is in the open state, is secured by the bottom ring, which is designed as a scraper, and which is provided with a lower part, which is formed with a elastic taper so that the system pressure against the spindle increases as the pressure in the process medium increases.
According to claim 7, it is advantageous that a sealing ring is arranged between the outside of the scraper and the valve housing and that the intermediate ring is provided with an inner and outer sealing ring. This bottom sealing ring ensures tightness upwards on the outside of the bottom ring and at the same time acts to bias the lower tip of the bottom ring so that sealing is also ensured at low pressures. The inner and outer sealing ring on the middle ring ensures that tightness is achieved upwards under the rinse cycle.
DK 2018 70124 A1
As stated in claim 8, it is advantageous that at least the valve body, the spindle and the intermediate ring are made of stainless steel and the scraper is made of high molecular weight polyethylene. This results in a hygienic construction with the desired properties for mutual sealing.
According to claim 9, it is advantageous for the rinsing liquid to be a so-called ClP liquid or a solvent. CIP stands for Cleaning-ln-Place, and the liquid is thus intended for cleaning by flushing. ClP liquid is suitable for degreasing, while diluent / solvent is suitably used in media that crystallizes and adheres to the blanks.
The invention will now be explained in more detail with reference to the drawings, in which:
FIG. 1 is a side view of a needle valve according to the invention, viewed from the side with certain parts removed,
FIG. 2 is a cross-sectional view of another embodiment of the needle valve;
FIG. 3 shows a needle valve according to FIG. 1 is a side view of the invention,
FIG. 4 shows a section through the valve body with the spindle in the closed position,
FIG. 5 shows a section through the valve housing with the spindle in the open position,
FIG. 6 shows a section through the valve housing with the spindle in the flushing position, and
DK 2018 70124 A1
FIG. 7 shows in cross-section and magnification an example of a sealing structure according to the invention, cf. FIG. 2nd
The needle valve according to the invention basically comprises two parts, a valve housing 1 and an actuator 2. In the valve housing 1 there is indicated by a reference numeral 3 a rotating spindle tip which forms the end of the spindle 4. In the valve housing 1 a base ring 5 is mounted around the spindle 4 with a seal 6. Above this is placed an intermediate sleeve 7 and above this an upper bottom ring 8 with an associated upper seal
9. Above the upper seal 9 is mounted an upper intermediate ring 10, which abuts against a top piece 11, which is provided with an external thread, on which a nut 12 is mounted.
The valve 1 has two operating modes (also called modes). Normal mode, in which valve 1 acts as a regular needle valve with a needle (spindle tip 3) raised when valve 1 opens and lowered to a seat when the valve closes. In Rinse mode, the spindle tip 3 is retracted even further, thereby allowing a medium to pass through the area between the bushing 7 and the spindle tip 3. In this way, deposits around the spindle tip 3 at the seal 6 can be flushed away.
The operation of the needle valve will be further explained in the following with the aid of Figs. 4-6 showing the embodiment with a sealing ring 6. In FIG. 4, the valve is shown in the closed position. The spindle tip 3 presses against the valve housing 1 and blocks the medium that normally enters
DK 2018 70124 A1 The valve body under the spindle tip via the conduit 13. The medium can be discharged from the valve body via the connection marked with 14. The flushing fluid enters via the connection 15. When the valve is in the closed position, the flushing fluid cannot get past the two seals 6 and 9. In the embodiment shown in FIG. 2 and 7, when the valve is in the closed position, the flushing fluid cannot pass the seals 5a, 17, 18 and 19.
In FIG. 5, the valve is shown in the open position. The spindle tip 3 is raised from the seat of the valve body 1 and no longer blocks the medium which can flow past the spindle tip 3. When the valve is in normal open position, the flushing fluid cannot pass the two seals 6 and 9 (seals 5a, 17, 18 and 19 in Fig. 2).
In FIG. 6, the valve is shown in Rinse mode: With the valve in Rinse mode, the pressure in the inlet and outlet of the medium must be less than the pressure in the connection 15. The spindle tip 3 is retracted so far that the lower part of the spindle having a smaller diameter than the upper part, is released from the inner lower bore of the intermediate bushing. Hereby it is opened that the medium in the flush light connection 15 can pass down past the seal 6 and further out through the connection 13 or 14. As the top piece 11 presses on the upper seal via the upper intermediate ring 10, it packs against the valve housing 1 and the spindle tip 3. This ensures that no process medium or rinse medium flows out at the head 11. The pressure from the head 11 propagates further down through the upper bottom ring 8, which presses on the intermediate sleeve 7 and the seal 6. In Rinse mode, the seal is pressed against the valve body and prevents flow between the seal and the
DK 2018 70124 A1 valve body. In normal mode, the seal is also pressed against the spindle tip, preventing flow between spindle tip and seal. The pressure from the cylinder head propagates to the bottom ring 5. This is designed to pack against the valve housing 1 and prevent flow between the bottom ring 5 and valve housing 1. For the embodiment shown in FIG. 2, as mentioned, sealing is achieved by the scraper 5a and the O-rings 17, 18 and 19.
It is advantageous if the spindle tip 3 communicates with the spindle 4 in such a way that the spindle tip 3 can rotate freely. The valve can be actuated manually with a spindle controlled by a thread, or automatically via an actuator which can be pneumatically, hydraulically or electrically operated.
As mentioned, a square PTFE seal can be used 6. Depending on the pressure, temperature and process media, other materials and sealing structures can be selected. For example, the seals may be elastomeric seals or plastic seals, and in the preferred embodiment, the seal is formed in the manner shown in FIG. 7. Exterior of the scraper 5a is located a sealing ring 17 which seals between the scraper 5a and the valve body. The sealing ring 17 is an O-ring. Sealing against the process medium flowing upwards along the spindle is ensured by the lower part of the scraper 5a being formed with an elastic taper so that the contact pressure against the spindle increases as the pressure in the process medium increases. Advantageously, the scraping can be made of high molecular weight polyethylene. Above the scraper 5a sits the intermediate ring 16 which in the illustrated embodiment is provided with an inner sealing ring 18
DK 2018 70124 A1 and an outer sealing ring 19, both of which are O-rings. In total, the three sealing rings and the scraper ensure that no pressure is lost upwards in the structure, either when the valve is open for normal operation or when flushing with flushing liquid through the duct 15.
In another preferred embodiment, a flush valve (not shown) is provided in connection with the inlet 15 for flushing liquid, which ensures that no flushing can be opened if the process medium is still under too high pressure.
The system of the present invention is particularly advantageous for very high pressure applications, but the principle can be applied to valves at all pressures. depends on the nature, temperature and pressure of the media.
It should be noted that the ups and downs here are indicated as directions relative to what is shown in the drawings, but the valve will also function if it is oriented differently in the room.

权利要求:
Claims (10)
[1]
patent claims
A needle valve for controlling a media flow and with a spindle (4) provided with a spindle tip (3), thereby contacting axial downward movement against a contact surface for closing the medium through the valve from the inlet (13) towards the outlet (14) and which, in axial upward movement, allows for flow of the medium, which needle valve is further provided with a lower sealing structure including a bottom ring (5) or a scraper (5a), around the spindle (4) to secure that the medium does not flow upwardly in the structure, which needle valve recognizes the characteristic that the spindle tip (3) can be pulled further upwards, thereby providing access for flushing fluid flowing from the flushing inlet (15), around the spindle tip (3) and past the bottom ring (5) ) or the scraper (5a), a cleaning of the outside of the spindle tip and the inside of the bottom ring (5) or the scraper (5a) is performed.
[2]
Needle valve according to claim 1, characterized in that the rinsing fluid flows out of either the inlet (13) or the outlet (14) for the process medium or out of both.
[3]
Needle valve according to claim 1 or 2, characterized in that a further sealing structure (9) is arranged around the spindle (4) above the rinsing inlet (15).
[4]
Needle valve according to any one of claims 1-3, characterized in that a non-return valve is located in the flushing fluid supply.
DK 2018 70124 A1
[5]
Needle valve according to any one of the preceding claims, characterized in that the seal upwards, when the valve is in the open state, is secured by a sealing ring (6) located around the spindle (4) between the bottom ring (5). and the intermediate bushing (7).
[6]
Needle valve according to any one of claims 1-4, characterized in that the seal upwards, when the valve is in the open state, is secured by means of the scraper (5a) equipped with a lower part, which is formed with a elastic taper so that the system pressure against the spindle increases as the pressure in the process medium increases.
[7]
Needle valve according to claim 6, characterized in that a sealing ring (17) is provided between the outside of the scraper (5a) and the valve housing (1) and the inner ring (16) is provided with an inner and outer sealing ring (18, 19). .
[8]
Needle valve according to any one of claims 6 or 7, characterized in that at least the valve housing (1), the spindle (4) and the intermediate ring (16) are made of stainless steel and the scraper (5a) is made of high molecular weight polyethylene.
[9]
Needle valve according to any one of claims 1 to 8, characterized in that the rinsing liquid is a so-called ClP liquid or a solvent.
[10]
A needle valve according to any one of the preceding claims, characterized in that the working medium's working pressure is above 500 bar and the working medium's working pressure is about 15 bar.

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同族专利:

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DK180003B1|2020-01-16|

引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
2019-10-04| PAT| Application published|Effective date: 20190827 |

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2020-01-16| PME| Patent granted|Effective date: 20200116 |

优先权:

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申请号 | 申请日 | 专利标题

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DKPA201870124A|DK180003B1|2018-02-26|2018-02-26|Needle valve with back flush|DKPA201870124A| DK180003B1|2018-02-26|2018-02-26|Needle valve with back flush|