A ball valve for chemical sampling

Abstract

The utility model relates to the technical field of sampling ball valves, specifically to a sampling ball valve for chemical sampling, comprising a sampling ball valve with an upper valve body, a middle body and a lower valve body, and is characterized in that a rotatable ball is built into the middle body, a sampling blind hole is provided on the ball, a valve seat is provided between the ball and the upper valve body and the lower valve body, the valve seat is an elastic structure, a sampling port which can be communicated with the sampling blind hole is provided at the lower part of the lower valve body, a rotating control structure for driving the ball to rotate is provided on the middle body, the ball has good sealing performance, sampling is pressure-free, safe and reliable, and will not be sprayed due to excessive medium pressure.

Description

Technical Field

[0001] The utility model relates to the technical field of sampling ball valves, in particular to a chemical sampling ball valve. Background Art

[0002] Sampling valves are valves used to obtain medium samples in pipelines or equipment. Sampling valves are used in many occasions where chemical analysis of medium samples is required frequently. Different types of sampling valves are selected according to the characteristics of the medium and the sampling volume. In the field of fine chemicals, the sampling of phenol in the non-phosgene production of polycarbonate projects, the sampling of intermediate base in the production of rubber additives, and the sampling of free acids in the chemical industry all require sampling valves: For sampling with a sampling volume of 10-30ml, plug-type sampling valves are usually selected. The plug-type sampling valve is ideal in theory, with a sealing surface of the coating structure, no dead angles and cavities, ensuring the freshness of the sample liquid, etc. The size of the sampling hole on the plug can be processed according to the sampling volume required by the customer, so as to achieve quantitative sampling, safety and environmental protection, no waste of sample liquid, and pressureless sampling. However, the operating torque of the plug-type sampling valve is relatively large, the operation is laborious, and the valve that needs to be opened frequently is prone to leakage, and it is not easy to adjust after leakage. There are certain natural defects in practical applications; for sampling with a sampling volume of more than 100ml, a stop-type sampling valve is usually selected. The stop-type sampling valve can achieve no dead angles and cavities, ensuring the freshness of the sample liquid, etc., but it usually cannot achieve pressureless sampling, which increases the risk of sampling. In addition, this type of sampling valve is large in size and inconvenient to install. In view of the insufficient use of the above conventional sampling valves, combined with the characteristics and requirements of the sampling valve, it is necessary to design and develop alternative products with better performance, which plays an important role in broadening the market in the chemical field and better meeting user needs. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the utility model provides a ball valve for chemical sampling, which has good sealing performance, pressure-free sampling, is safe and reliable, and will not spray out due to excessive medium pressure.

[0005] (II) Technical solution

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a ball valve for chemical sampling, comprising a sampling ball valve with an upper valve body, a middle body and a lower valve body, wherein a rotatable ball is built in the middle body, a sampling blind hole is provided in the ball, valve seats are provided between the ball and the upper valve body and the lower valve body, the valve seats are elastic structures, a sampling port which can be communicated with the sampling blind hole is provided at the lower part of the lower valve body, and a rotation control structure for driving the ball to rotate is provided on the middle body.

[0007] Preferably, an O-ring 1 is provided on the bottom side of the valve seat.

[0008] Preferably, the rotation control structure includes a valve stem fixedly connected to one end of the sphere, the outer part of the valve stem is sleeved with a valve stem sleeve fixedly connected to the middle body, the outer part of the valve stem sleeve is provided with a handle assembly connected to the valve stem, and a sealing packing clamping mechanism is provided between the valve stem sleeve and the side of the valve stem sleeve away from the sphere.

[0009] Preferably, the sealing packing clamping mechanism includes a sealing packing and a pressure ring, a stuffing box is provided on the side of the valve stem sleeve away from the sphere, the sealing packing is pressed in the sealing packing by the pressure ring, and a disc spring is arranged on the outside of the pressure ring, and the disc spring is pre-tightened by a fastening nut.

[0010] Preferably, an O-ring 2 is provided on the side of the valve stem and the valve stem sleeve close to the sphere.

[0011] Preferably, the connection between the ball and the upper valve body, the middle body and the lower valve body adopts a dead zone-free design, and the upper valve body, the middle body and the lower valve body all adopt arc transition and additional spoiler bosses.

[0012] Preferably, the sampling port is provided with a connecting sleeve fixedly connected to the lower valve body, and also includes a sampling bottle threadedly connected to the connecting sleeve.

[0013] Preferably, an exhaust hole is provided on the side of the connecting sleeve.

[0014] Preferably, the connecting sleeve is made of PTFE material, and the sampling bottle is made of fully transparent glass with volume scale.

[0015] Preferably, the sampling blind hole is configured as a U-shaped single-port structure.

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the utility model provides a ball valve for chemical sampling, which has the following beneficial effects:

[0018] 1. The valve seat adopts an elastic structure to ensure the sealing performance of the valve, reduce the friction torque of the valve seat and the flexibility of the opening and closing of the ball, and the operating torque is small; the upstream and downstream valve seats adopt a double sealing structure. By rotating the handle assembly 180 degrees, the downstream valve seat always remains sealed during the closing process of the upstream valve seat and the ball, and the upstream valve seat is sealed before the liquid in the ball cavity flows into the sampling bottle, ensuring that the liquid medium in the ball cavity flows into the sampling bottle without pressure, which is safe and reliable and will not be sprayed out due to excessive medium pressure.

[0019] 2. An O-ring is installed on the bottom side of the valve seat to form a piston effect when the valve seat moves forward, pushing the valve seat to better press the ball to ensure the inlet seal and fully ensure that the pipeline fluid will not flow into the cavity when the ball is closed.

[0020] 3. The connection between the ball and the upper valve body, middle body and lower valve body adopts a dead zone design. The spherical surface of the ball is very close to the pipeline channel. The arc transition on both sides, plus the spoiler boss design on the upper part, makes the flow channel have no dead angle, ensuring the freshness of the sample liquid.

[0021] 4. The size of the sampling blind hole can be processed according to the sampling volume required by the customer to achieve quantitative sampling, which is safe and environmentally friendly without wasting sample liquid.

[0022] 5. The sampling bottle is made of fully transparent glass with volume scale, which makes it easy to see the sampling amount.

[0023] 6. The connection sleeve is made of PTFE material with good sealing performance. The connection sleeve and the sampling bottle are connected by threads, which is convenient and quick to disassemble. At the same time, there is an exhaust hole on the side of the connection sleeve to release the residual pressure in the cavity and ensure the safety of the sampling bottle when sampling.

[0024] 7. The O-ring and sealing packing between the valve stem and the valve stem sleeve ensure that the medium will not leak out. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0026] Figure 2 It is a structural schematic diagram of the sampling process of the utility model;

[0027] Figure 3 It is a structural schematic diagram of the sphere of the utility model.

[0028] Markings in the attached figure: 1. Upper valve body; 2. Middle body; 3. Ball; 4. Valve seat; 5. O-ring 1; 6. Lower valve body; 7. Connecting sleeve; 8. Sampling bottle; 9. O-ring 2; 10. Valve stem; 11. Valve stem sleeve; 12. Sealing packing; 13. Pressing ring; 14. Fastening nut; 15. Disc spring; 16. Handle assembly. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Example:

[0031] See also Figure 1-3A ball valve for chemical sampling, the ball valve for chemical sampling comprising a sampling ball valve having an upper valve body 1, a middle body 2 and a lower valve body 6, wherein a rotatable ball 3 is built in the middle body 2, the ball 3 is provided with a sampling blind hole, a valve seat 4 is provided between the ball 3 and the upper valve body 1 and the lower valve body 6, the valve seat 4 is an elastic structure, a sampling port which can be communicated with the sampling blind hole is provided at the lower part of the lower valve body 6, and a rotation control structure for driving the ball 3 to rotate is provided on the middle body 2. When sampling is required, it is only necessary to rotate the ball 3 180 degrees, and online sampling can be achieved without stopping the machine or connecting an external bypass. The upstream and downstream valve seats 4 double sealing structure is adopted. By rotating the handle assembly 16 180 degrees, the downstream valve seat 4 always remains sealed during the closing process of the upstream valve seat 4 and the ball 3, and the upstream valve seat 4 is sealed before the liquid in the ball cavity flows into the sampling bottle 8, ensuring that the liquid medium in the ball cavity flows into the sampling bottle 8 without pressure, which is safe and reliable, and will not be sprayed out due to excessive medium pressure; the sealing of the downstream valve seat 4 ensures that the liquid medium in the ball cavity flows into the sampling bottle 8 without pressure during the sampling process, which is safe and reliable, and will not be sprayed out due to excessive medium pressure; the elastic sealing structure helps to ensure the sealing performance of the valve, reduce the friction torque of the valve seat 4 and the flexibility of opening and closing of the ball 3; ensure the sealing performance of the valve, reduce the friction torque of the valve seat 4 and the flexibility of opening and closing of the ball 3, and the operating torque is small; the size of the sampling blind hole can be processed according to the sampling amount required by the customer, to achieve quantitative sampling, safety and environmental protection, and no waste of sample liquid.

[0032] Specifically, an O-ring 5 is provided on the bottom side of the valve seat 4. On the one hand, it can provide the valve seat 4 with a force to squeeze the ball 3 and increase the sealing force of the valve seat 4. On the other hand, it can ensure that the outer side of the valve seat 4 will not leak, and better ensure the sealing of the valve sampling inlet end; an O-ring is installed on the outer side of the valve seat 4, and a piston effect is formed when the valve seat 4 moves forward, pushing the valve seat 4 to better press the ball 3, ensuring the inlet sealing, and fully ensuring that the pipeline fluid will not flow into the cavity when the ball 3 is closed.

[0033] Specifically, the rotation control structure includes a valve stem 10 fixedly connected to one end of the sphere 3, the outer part of the valve stem 10 is sleeved with a valve stem sleeve 11 fixedly connected to the middle body 2, the outer part of the valve stem sleeve 11 is provided with a handle assembly 16 connected to the valve stem 10, and a sealing packing clamping mechanism is provided between the valve stem sleeve 11 and the side of the valve stem sleeve 11 away from the sphere 3.

[0034] Specifically, the sealing packing pressing mechanism includes a sealing packing 12 and a pressure ring 13. A stuffing box is provided on the side of the valve stem sleeve 11 away from the ball 3. The sealing packing 12 is pressed into the sealing packing 12 by the pressure ring 13. A disc spring 15 is provided outside the pressure ring 13, and the disc spring 15 is pre-tightened by the fastening nut 14. The disc spring 15 provided between the pressure ring 13 and the fastening nut 14 continuously provides a pressing force to the sealing packing 12, thereby ensuring the permanent sealing of the sealing packing 12, and no leakage occurs at the valve stem 10.

[0035] Specifically, an O-ring 9 is provided on the side of the valve stem 10 and the valve stem sleeve 11 close to the ball 3 to provide another seal for the valve stem 10, making the seal safer.

[0036] Specifically, the connection between the sphere 3 and the upper valve body 1, the middle body 2 and the lower valve body 6 adopts a dead zone design, and the upper valve body 1, the middle body 2 and the lower valve body 6 adopt arc transition and additional spoiler bosses. The dead zone design and internal polishing ensure that there is no residual liquid in the cavity during sampling, and the sampling quality is guaranteed. The connection adopts a dead zone design, the spherical surface is very close to the pipeline channel, the arc transition on both sides, and the spoiler boss design on the upper part make the flow channel have no dead angle, and ensure the freshness of the sample liquid.

[0037] Specifically, the sampling port is provided with a connecting sleeve 7 fixedly connected to the lower valve body 6, and also includes a sampling bottle 8 threadedly connected to the connecting sleeve 7, which is corrosion-resistant, easy to seal, and convenient and quick to disassemble.

[0038] Specifically, a vent hole is provided on the side of the connecting sleeve 7 to release the residual pressure in the cavity and ensure the safety of the sampling bottle 8 when sampling.

[0039] Specifically, the connecting sleeve 7 is made of PTFE material, and the sampling bottle 8 is made of fully transparent glass with volume scale, which is convenient for viewing the sampling amount. The connecting sleeve 7 is made of PTFE material and has good sealing performance.

[0040] Specifically, the sampling blind hole is set to a U-shaped single-port structure.

[0041] It should be noted that the phrases "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0042] It should be easily understood that “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0043] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0044] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A ball valve for chemical sampling, comprising an upper valve body (1), a middle valve body (2), and a lower valve body (6), characterized in that: The middle body (2) has a rotatable ball (3) built in, the ball (3) is provided with a sampling blind hole, a valve seat (4) is provided between the ball (3) and the upper valve body (1) and the lower valve body (6), the valve seat (4) is an elastic structure, the lower part of the lower valve body (6) is provided with a sampling port that can be connected with the sampling blind hole, and a rotation control structure for driving the ball (3) to rotate is provided on the middle body (2).

2. The ball valve for chemical sampling according to claim 1, characterized in that: An O-ring (5) is provided on the bottom side of the valve seat (4).

3. The ball valve for chemical sampling according to claim 2 is characterized in that: The rotation control structure comprises a valve stem (10) fixedly connected to one end of the ball (3); the valve stem (10) is externally sleeved with a valve stem sleeve (11) fixedly connected to the middle body (2); the valve stem sleeve (11) is externally provided with a handle assembly (16) connected to the valve stem (10); and a sealing packing clamping mechanism is provided between the valve stem sleeve (11) and on the side of the valve stem sleeve (11) away from the ball (3).

4. The ball valve for chemical sampling according to claim 3 is characterized in that: The sealing packing clamping mechanism comprises a sealing packing (12) and a pressure ring (13); a stuffing box is provided on the side of the valve stem sleeve (11) away from the ball (3); the sealing packing (12) is pressed into the sealing packing (12) by the pressure ring (13); a disc spring (15) is provided outside the pressure ring (13); and the disc spring (15) is pre-tightened by a fastening nut (14).

5. The ball valve for chemical sampling according to claim 4, characterized in that: An O-ring 2 (9) is provided on the side of the valve stem (10) and the valve stem sleeve (11) close to the sphere (3).

6. The ball valve for chemical sampling according to claim 5, characterized in that: The connection between the ball (3) and the upper valve body (1), the middle body (2) and the lower valve body (6) all adopts a dead zone-free design, and the upper valve body (1), the middle body (2) and the lower valve body (6) all adopt arc transitions and additional spoiler bosses.

7. The ball valve for chemical sampling according to claim 6, characterized in that: The sampling port is provided with a connecting sleeve (7) fixedly connected to the lower valve body (6), and also includes a sampling bottle (8) threadedly connected to the connecting sleeve (7).

8. The ball valve for chemical sampling according to claim 7, characterized in that: The side surface of the connecting sleeve (7) is provided with an exhaust hole.

9. The ball valve for chemical sampling according to claim 8, characterized in that: The connecting sleeve (7) is made of PTFE material, and the sampling bottle (8) is made of fully transparent glass material with volume scale.

10. The ball valve for chemical sampling according to claim 9, characterized in that: The sampling blind hole is set as a U-shaped single-port structure.

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