Fluorine-lined sampling valve

Abstract

The utility model discloses a fluorine-lined sampling valve, which belongs to the field of fluid conveying equipment and comprises a valve body, a flow guide flow channel and a sampling hole, which are communicated with each other and are transversely and vertically communicated with each other, are arranged in the valve body; the valve rod is arranged in the sampling hole, and the bottom end of the valve rod is attached to the inner wall of the bottom end of the sampling hole; the sampling bottle is detachably arranged at the bottom end of the valve body and is communicated with the bottom end of the sampling hole. The lining layer is adopted, the fluorine lining characteristics of PFA, FEP, PTFE and the like are mainly utilized, and fluoroplastic materials have excellent chemical resistance and corrosion resistance, can resist all corrosive media at normal temperature and normal pressure and can be used for sampling the corrosive media, so that the reliability and durability of the valve in a severe environment are ensured, and the service life of the valve is prolonged. And the fluoroplastic materials such as PFA, FEP and PTFE are low in cost, so that the fluoroplastic can be produced on a large scale through molding processes such as injection molding, the cost is reduced, and the fluoroplastic can be widely applied to the industries such as pharmacy, chemical engineering and food.

Description

Technical Field

[0001] The utility model belongs to the field of fluid conveying equipment, and particularly relates to a fluorine-lined sampling valve. Background Art

[0002] A sampling valve is a valve used to obtain a medium sample in a pipeline or equipment, and is used in occasions where chemical analysis of the medium sample is required frequently. By opening and closing the sampling valve, the required sample can be taken out from the pipeline or container for subsequent analysis, detection, monitoring and other purposes.

[0003] However, the metal sampling valves in the prior art often show the characteristic of being corrosion-resistant when facing corrosive media, which limits their applications in industries such as chemical engineering, pharmaceuticals and food. Although special materials can be selected to manufacture the sampling valve, the cost of these special materials is usually too high and not suitable for large-scale industrial production. Therefore, a fluorine-lined sampling valve is proposed to solve the above problems. Summary of the Utility Model

[0004] In view of one or more of the above defects or improvement requirements of the prior art, the present utility model provides a fluorine-lined sampling valve, which has the advantages of simple structure, beautiful and firm, prefabricated and assembled construction, and convenient and fast construction.

[0005] To achieve the above object, the present utility model provides a fluorine-lined sampling valve, including:

[0006] A valve body, which is internally provided with a diversion flow channel and a sampling hole that are communicated with each other and penetrate horizontally and vertically respectively;

[0007] A valve stem, which is arranged in the sampling hole and the bottom end thereof is in contact with the inner wall of the bottom end of the sampling hole;

[0008] A sampling bottle, which is detachably arranged at the bottom end of the valve body and communicated with the bottom end of the sampling hole;

[0009] A handwheel mechanism, which is connected to the valve stem and used to drive the valve stem to move vertically to open / close the bottom end of the sampling hole;

[0010] The inner walls of the diversion flow channel, the sampling hole and the outer wall of the valve stem are all provided with a lining layer;

[0011] The lining layer includes at least one of PFA, FEP and PTFE.

[0012] As a further improvement of the present utility model, it further includes a joint, which is arranged at the bottom end of the valve body and is provided with a through hole communicated with the sampling hole, and the sampling bottle is detachably connected to the joint and communicated with the through hole.

[0013] As a further improvement of the present utility model, the handwheel mechanism includes:

[0014] A valve cover is arranged on the valve body and is provided with a mounting cavity connected to the sampling hole, and the valve stem is arranged in the mounting cavity and the top end thereof passes through the valve cover;

[0015] The hand wheel is transmission-connected to the valve cover and rotationally connected to the top end of the valve stem.

[0016] As a further improvement of the utility model, the valve cover comprises a lower cover body connected to the valve body and an upper cover body connected to the lower cover body;

[0017] The inner wall and the bottom end of the lower cover are both provided with a lining layer.

[0018] As a further improvement of the utility model, a sealing member is provided in the installation cavity and is located outside the valve stem and is used to seal the connection between the sampling hole and the installation cavity.

[0019] As a further improvement of the utility model, the sealing member includes a packing arranged in the installation cavity and a gland located on the packing, the gland is connected to the valve cover, and the gland and the packing are both located outside the valve stem.

[0020] As a further improvement of the utility model, the sealing member further comprises an annular sealing groove arranged in the installation cavity, and an O-ring in contact with the valve stem is arranged in the annular sealing groove.

[0021] As a further improvement of the utility model, the flow guide channel includes a sample inlet and a sample outlet, and the sample inlet and the sample outlet are respectively arranged at two ends of the valve body.

[0022] In general, compared with the prior art, the above technical solutions conceived by the utility model have the following beneficial effects:

[0023] The fluorine-lined sampling valve of the utility model adopts a lining layer, which mainly utilizes the fluorine-lined characteristics of PFA, FEP and PTFE. These fluoroplastic materials have excellent chemical resistance and corrosion resistance, and can withstand all corrosive media at room temperature and pressure. They can be used for sampling corrosive media, ensuring the reliability and durability of the valve in harsh environments. In addition, the cost of fluoroplastic materials such as PFA, FEP and PTFE is relatively low. These fluoroplastics can be mass-produced through molding processes such as injection molding to reduce costs, and can be widely used in the pharmaceutical, chemical, food and other industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a cross-sectional view of the utility model;

[0025] Figure 2 It is a side view of the utility model;

[0026] Figure 3 It is a front view of the utility model.

[0027] In all the attached drawings, the same reference numerals denote the same technical features, specifically: 1. valve body; 2. diversion flow channel; 21. sample inlet; 22. sample outlet; 3. sampling hole; 4. valve stem; 5. sampling bottle; 6. handwheel mechanism; 61. valve cover; 611. lower cover body; 612. upper cover body; 62. installation cavity; 63. handwheel; 64. seal; 641. packing; 642. gland; 643. O-ring seal; 7. lining layer; 8. joint. Detailed implementation mode

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the attached drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0029] Given by Figures 1-3 a fluorine-lined sampling valve, comprising:

[0030] a valve body 1, inside which there are a diversion flow channel 2 and a sampling hole 3 that are interconnected and respectively penetrate horizontally and vertically;

[0031] Specifically, the diversion flow channel 2 includes a sample inlet 21 and a sample outlet 22, and the sample inlet 21 and the sample outlet 22 are respectively arranged at both ends of the valve body 1;

[0032] Since the traditional sampling valve structure design often has problems such as flow channel retention and flow resistance, which will affect the flow rate of the pipeline and may lead to inaccurate sampling;

[0033] Therefore, a direct-through design is adopted between the sample inlet 21 and the sample outlet 22 of this application, and the fluid can directly pass through the valve without passing through complex turns or narrow channels, thereby reducing the turbulence and resistance of the fluid;

[0034] a valve stem 4, arranged in the sampling hole 3 and the bottom end thereof is in contact with the inner wall of the bottom end of the sampling hole 3;

[0035] a sampling bottle 5, detachably arranged at the bottom end of the valve body 1 and communicated with the bottom end of the sampling hole 3;

[0036] a handwheel mechanism 6, connected to the valve stem 4 for driving the valve stem 4 to move vertically to open / close the bottom end of the sampling hole 3;

[0037] Adopting the design of lifting the valve stem 4 instead of rotating the valve stem 4 can reduce the friction between the valve stem 4 and the valve body 1, thereby reducing the operating torque and flow resistance;

[0038] The inner walls of the diversion flow channel 2, the sampling hole 3 and the outer wall of the valve stem 4 are all provided with a lining layer 7;

[0039] The lining layer 7 includes at least one of PFA, FEP, and PTFE;

[0040] The above materials not only have corrosion resistance, but also have a smooth surface and a low friction coefficient, which helps the fluid to pass through smoothly.

[0041] Specifically, PFA (perfluoroalkoxy alkane) is a transparent and flexible fluoroplastic with excellent chemical resistance and heat resistance. It is almost inert to all chemicals, including strong acids, strong bases, solvents, and oxidants, and can even withstand higher temperatures for a short time;

[0042] FEP (fluorinated ethylene propylene copolymer) has similar properties to PFA, but slightly lower heat resistance;

[0043] PTFE (polytetrafluoroethylene) has a very low friction coefficient, does not absorb water and does not adhere, and is resistant to chemicals and high temperatures;

[0044] Therefore, PFA (perfluoroalkoxy alkane), FEP (fluorinated ethylene propylene copolymer), and PTFE (polytetrafluoroethylene) are widely used in the fields of chemical industry, semiconductors, medical equipment, and laboratory instruments, especially in occasions that require high corrosion resistance;

[0045] By using fluoroplastic materials such as PFA, FEP, and PTFE as the lining, this application solves the problem that the metal valve is not corrosion-resistant, and solves the expensive problem by reducing materials and manufacturing costs.

[0046] It also includes a joint 8, which is arranged at the bottom end of the valve body 1 and is provided with a through hole communicating with the sampling hole 3. The sampling bottle 5 is detachably connected to the joint 8 and communicates with the through hole;

[0047] Specifically, the sampling bottle 5 is also provided with a scale on its bottle body, which can be used to observe the inflow amount during sampling, meeting the user's sampling amount requirement;

[0048] Since the sample enters the sampling bottle 5 under pressure, therefore, the joint 8 is also provided with an exhaust port that communicates the sampling bottle 5 with the outside world. The pressure can be discharged through the exhaust port, realizing pressureless sampling and taking an appropriate amount;

[0049] And the sampling bottle 5 can be screwed off from the joint 8 by screwing the sampling bottle 5 onto the joint 8. It is convenient for the operator to quickly disassemble and assemble the sampling bottle 5. Then, after covering the bottle cap, the sampling bottle 5 can be sealed to avoid contaminating the sample and taking the sample to the laboratory for testing;

[0050] Among them, the sampling bottle 5 can be selected from two types: transparent and light-proof.

[0051] The handwheel mechanism 6 includes:

[0052] The valve cover 61 is arranged on the valve body 1 and is provided with a mounting cavity 62 which is connected with the sampling hole 3. The valve stem 4 is arranged in the mounting cavity 62 and the top end thereof passes through the valve cover 61.

[0053] The hand wheel 63 is transmission-connected to the valve cover 61 and rotationally connected to the top end of the valve stem 4 .

[0054] Specifically, the hand wheel 63 is threadedly connected to the valve cover 61, and the fluorine-lined valve stem 4 can be pulled up and down by rotating the hand wheel 63 to control the opening and closing degree of the valve stem 4 and the sampling hole 3, so as to accurately control the flow rate and the sampling volume, so that the sample enters the sampling bottle;

[0055] Furthermore, a mounting hole is provided on the hand wheel 63, an upper bearing is provided in the mounting hole, a dust plug covering the mounting hole is inserted at the top of the hand wheel 63, a lower bearing is provided on the inner wall of the top of the valve cover 61, the valve stem 4 is rotatably provided in the upper bearing and the lower bearing, and the top of the valve stem 4 is connected to the inner side of the dust plug;

[0056] By equipping two bearings, the operating torque can be reduced when the hand wheel 63 is rotated to drive the fluorine-lined valve stem 4 to move up and down, and the valve stem 4 only moves up and down without rotating, thus avoiding friction with the valve body 1 and prolonging its service life;

[0057] The valve cover 61 includes a lower cover body 611 connected to the valve body 1 and an upper cover body 612 connected to the lower cover body 611;

[0058] The inner wall and the bottom end of the lower cover body 611 are provided with a lining layer 7 .

[0059] A sealing member 64 is provided in the installation cavity 62 and is located outside the valve stem 4 and is used to seal the connection between the sampling hole 3 and the installation cavity 62 .

[0060] The sealing member 64 includes a packing 641 disposed in the mounting cavity 62 and a gland 642 located on the packing 641 . The gland 642 is connected to the valve cover 61 . Both the gland 642 and the packing 641 are located outside the valve stem 4 .

[0061] The sealing member 64 further includes an annular sealing groove disposed in the mounting cavity 62, and an O-ring 643 is disposed in the annular sealing groove and fits the valve stem 4;

[0062] By arranging the packing 641 and the gland 642 in the mounting cavity 62, and the O-ring 643 in the annular sealing groove, this design provides a multi-layer sealing mechanism, which can effectively prevent fluid leakage and maintain good sealing performance even under high pressure or frequent operation;

[0063] Moreover, the upper cover body 612, the lower cover body 611, and the gland 642 are all connected by bolts. The detachable structure can conveniently replace the worn seals or packings without replacing the entire valve, which reduces the maintenance cost and improves the reliability of the valve.

[0064] The usage process of the fluorine-lined sampling valve of the present utility model is as follows:

[0065] The sample flows through the pipeline, enters the valve from the sample inlet, and flows out to the pipeline from the sample outlet;

[0066] Among them, when the operator needs to take a sample, by operating the rotating handwheel, the handwheel rotates and moves upward on the upper cover body 612, driving the valve stem 4 to move upward, releasing the blockage between the bottom end of the valve stem 4 and the sampling hole 3, so that the sample flow can enter the sampling bottle 5 through the sampling hole 3;

[0067] As the volume in the sampling bottle 5 gradually increases, the excess air is discharged through the exhaust hole. When the target scale is reached, the operator can reverse the handwheel to move the valve stem 4 downward to block the sampling hole 3, then rotate the sampling bottle 5 to take it off, and after covering the bottle cap, the sampling bottle 5 can be sealed to avoid contaminating the sample, and the sample can be taken to the laboratory for testing;

[0068] For all areas where the above-mentioned sample flow circulates in the valve body 1, there is a lining layer 7 for anti-corrosion isolation.

[0069] In summary, the above content selects the preferred practical solutions of the present utility model for illustration, and it cannot be determined that the specific implementation of the present utility model is only limited to these descriptions.

[0070] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. Fluorine-lined sampling valve, characterized in that it comprises: A valve body (1) with a diversion flow channel (2) and a sampling hole (3) that are interconnected and penetrate horizontally and vertically respectively; A valve stem (4) disposed in the sampling hole (3) and having its bottom end in contact with the inner wall of the bottom end of the sampling hole (3); A sampling bottle (5) detachably disposed at the bottom end of the valve body (1) and communicating with the bottom end of the sampling hole (3); A handwheel mechanism (6) connected to the valve stem (4) for driving the valve stem (4) to move vertically to open / close the bottom end of the sampling hole (3); The inner walls of the diversion flow channel (2), the sampling hole (3) and the outer wall of the valve stem (4) are all provided with a lining layer (7); The lining layer (7) comprises at least one of PFA, FEP and PTFE.

2. The lined fluorine sampling valve according to claim 1, wherein It further comprises a joint (8) disposed at the bottom end of the valve body (1) and having a through hole communicating with the sampling hole (3), and the sampling bottle (5) is detachably connected to the joint (8) and communicates with the through hole.

3. The lined fluorine sampling valve according to claim 1, wherein The handwheel mechanism (6) comprises: A valve cover (61) disposed on the valve body (1) and having an installation cavity (62) communicating with the sampling hole (3), and the valve stem (4) is disposed in the installation cavity (62) and its top end penetrates through the valve cover (61); A handwheel (63) drivingly connected to the valve cover (61) and rotatably connected to the top end of the valve stem (4).

4. The lined fluorine sampling valve according to claim 1, wherein The valve cover (61) comprises a lower cover body (611) connected to the valve body (1) and an upper cover body (612) connected to the lower cover body (611); The inner wall and the bottom end of the lower cover body (611) are both provided with a lining layer (7).

5. The lined fluorine sampling valve according to claim 3, characterized in that, A seal (64) is disposed in the installation cavity (62) outside the valve stem (4) for sealing the connection between the sampling hole (3) and the installation cavity (62).

6. The lined fluorine sampling valve according to claim 5, characterized in that, The seal (64) comprises a packing (641) disposed in the installation cavity (62) and a gland (642) located on the packing (641), the gland (642) is connected to the valve cover (61), and both the gland (642) and the packing (641) are outside the valve stem (4).

7. The lined fluorine sampling valve according to claim 5, characterized in that, The seal (64) further comprises an annular seal groove disposed in the installation cavity (62), and an O-ring seal (643) fitting with the valve stem (4) is disposed in the annular seal groove.

8. The lined fluorine sampling valve according to claim 1, wherein The diversion flow channel (2) comprises a sample inlet (21) and a sample outlet (22), and the sample inlet (21) and the sample outlet (22) are respectively disposed at both ends of the valve body (1).

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