A constant-volume valve for high-pressure testing

Abstract

This invention provides a constant-volume valve for high-pressure testing, comprising a valve body, a valve seat, a valve needle, and a valve stem. The valve body has an overflow channel and an outlet channel, the overflow channel penetrating the valve body and communicating with the outlet channel. The valve seat is detachably installed within the overflow channel and has a valve seat channel penetrating the valve seat. The valve needle is slidably disposed within the overflow channel and opposite to the valve seat channel. The valve stem is rotatably disposed within the overflow channel. The valve needle can be screwed to the valve stem, and the valve needle can move within the overflow channel to open or close the communication between the valve seat channel and the outlet channel as the valve stem rotates in both directions. This design is convenient to operate and effectively ensures constant-volume performance.

Description

Technical Field

[0001] This invention relates to the field of valves, and more particularly to a constant-capacity valve for high-pressure testing. Background Technology

[0002] Pressure measurement covers pressure ranges from a few Pa to over 2000 MPa, typically categorized as micro-pressure (<10 kPa), low pressure (0.01 MPa–0.25 MPa), medium pressure (0.25 MPa–100 MPa), high pressure (>100 MPa), and ultra-high pressure (>600 MPa). The media transmitting pressure are primarily fluids such as gas and liquid. For high-pressure and ultra-high-pressure measurement, pressure generation and measurement are inevitably involved. Generally, the liquid medium is pressurized to the required pressure through pressure pipelines, valves, and a power source, and then the value is reproduced by a standard source. Valves are crucial in pressure measurement; their safety and sealing are important factors ensuring accurate pressure value transmission. In the direct comparison method of value transmission, maintaining a constant fluid volume within the pipeline when switching pipeline connection points, and not disrupting the original pressure balance, helps shorten pressure balancing time and improves operability and reliability in accurate pressure measurement.

[0003] Currently, pressure valves used in industrial applications mainly include check valves, relief valves, gate valves, and check valves. With the rapid development of the valve industry, higher requirements have been placed on various aspects of valves, such as technical parameters, resistance to strong corrosion, service life, and application structure.

[0004] For example, attached Figure 1 The constant-volume pressure valve shown has a three-section structure for its stem and sealing section: an upper stem section, a sealing middle section, and a lower stem section. These three sections are fixedly connected. Gas-driven up-and-down movement of the stem causes linear up-and-down movement of the sealing middle section, which, in conjunction with the valve body, achieves pipeline shut-off. (See attached figure.) Figure 2 The volumetric valve shown uses a gas-driven lifting structure to move the valve stem and sealing structure up and down, achieving the characteristics of a volumetric and on / off valve. Both types of valves described above have the following drawbacks:

[0005] (1) Under ultra-high pressure environment, the pressure valve of this structure cannot be used under high pressure (>200MPa). It uses a valve ball and air drive structure for sealing. Due to the large cross-sectional area of ​​the valve ball, the valve stem is subjected to too much force under high pressure. The structural components cannot support the large pressure and yield, which will eventually lead to the valve ball not sealing properly. Secondly, the valve stem is subjected to a large force, and the air drive structure cannot provide such a large support force. Therefore, it is not suitable for use under high pressure.

[0006] (2) Using gas to drive the valve to open is complicated and inefficient, and is not suitable for occasions where the valve needs to be opened and closed frequently.

[0007] (3) The upper and lower sections of the valve stem cannot change volume completely equally during the movement process, and cannot completely achieve the effect of constant volume. Summary of the Invention

[0008] To address the aforementioned problems, this invention provides a volume control valve for high-pressure testing that is easy to operate and effectively ensures volume control performance.

[0009] A constant-volume valve for high-pressure testing includes a valve body, a valve seat, a valve needle, and a valve stem. The valve body has an overflow channel and an outlet channel. The overflow channel passes through the valve body and communicates with the outlet channel. The valve seat is detachably installed in the overflow channel and has a valve seat channel passing through it. The valve needle is slidably disposed in the overflow channel and opposite to the valve seat channel. The valve stem is rotatably disposed in the overflow channel. The valve needle can be screwed to the valve stem and can move within the overflow channel to open or close the communication between the valve seat channel and the outlet channel as the valve stem rotates in both directions.

[0010] Alternatively, the flow passage includes a flow guide section and a sealing section that are interconnected, the outlet passage is connected to the sealing section, the valve needle is located within the sealing section, a first step is formed between the flow guide section and the sealing section, and the valve seat is located within the flow guide section and abuts against the first step.

[0011] Optionally, it may also include a first locking nut, which is screwed onto the side of the guide section opposite to the sealing section, so that the valve seat is detachably mounted between the first step and the first locking nut.

[0012] Alternatively, the mating surface between the valve seat and the first step is conical; the mating surface between the valve seat and the first locking nut is also conical.

[0013] Optionally, it may also include a sealing assembly disposed between the valve stem and the valve body.

[0014] Optionally, it may also include a first locking member and a second locking member, both of which are sleeved on the valve stem and abut against the upper and lower sides of the sealing assembly.

[0015] Alternatively, the first locking member may have a plurality of insertion portions through which the sealing assembly passes.

[0016] Optionally, it may also include a second locking nut, which is sleeved on the valve stem and screwed to the end of the flow passage opposite to the first locking nut, so as to lock the first locking member, the second locking member and the sealing assembly.

[0017] Optionally, it may also include a rolling element disposed between the valve stem and the second locking nut, and / or between the valve stem and the first locking element.

[0018] Optionally, it may also include a handle, wherein the end of the valve stem extending outside the flow passage is connected to a handle.

[0019] Compared with existing technologies, this technical solution has the following advantages:

[0020] The valve needle moves linearly up and down with the rotation of the valve stem, and its movement is limited to the sealed cavity formed between the valve stem and the valve seat. It only facilitates fluid movement within the valve body, without affecting fluid movement within the connecting pipe, disrupting pressure balance, changing the internal volume of the sealed cavity, or causing pressure changes, thus effectively ensuring constant volume. The constant volume valve can be opened and closed by rotating the valve stem in both directions, making it easy to operate, improving work efficiency, and expanding its application range. Furthermore, a sealing assembly is provided between the valve stem and the flow channel, and the sealing assembly and the valve seat are located on opposite sides of the sealing section, allowing the valve needle to move up and down within this section, improving sealing performance. The valve seat is detachably installed within the flow guide section, facilitating installation and replacement, reducing maintenance costs, and improving efficiency and value.

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of an existing constant-volume pressure valve;

[0023] Figure 2 This is a schematic diagram of an existing constant-volume valve;

[0024] Figure 3 This is a schematic diagram of the constant-volume valve structure for high-pressure testing as described in this invention;

[0025] Figure 4 for Figure 3 Enlarged diagram of A in the middle;

[0026] Figure 5 This is a schematic diagram of the sealing assembly described in this invention.

[0027] In the diagram: 100 Valve body, 110 Flow passage, 111 Guide section, 112 Sealing section, 113 Corner, 114 First step, 115 Control section, 116 Second step, 120 Outlet passage, 200 Valve seat, 210 Valve seat passage, 300 Valve needle, 400 Valve stem, 410 Abutment part, 510 First locking nut, 520 Second locking nut, 600 Sealing assembly, 610 First sealing ring, 620 Second sealing ring, 710 First locking element, 711 Insertion part, 720 Second locking element, 800 Handle, 810 Handle pin, 910 First steel ball, 920 Second steel ball. Detailed Implementation

[0028] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0029] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0030] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0031] like Figure 3As shown, the constant-capacity valve for high-pressure testing includes a valve body 100, a valve seat 200, a valve needle 300, and a valve stem 400. The valve body 100 has a flow passage 110 and an outlet passage 120. The flow passage 110 passes through the valve body 100 and communicates with the outlet passage 120. The valve seat 200 is detachably installed in the flow passage 110. The valve seat 200 has a valve seat passage 210 that passes through the valve seat 200. The valve needle 300 is slidably disposed in the flow passage 110 and is opposite to the valve seat passage 210. The valve stem 400 is rotatably disposed in the flow passage 110. The valve needle 300 can be screwed to the valve stem 400, and the valve needle 300 can move within the flow passage 110 to open or close the communication between the valve seat passage 210 and the outlet passage 120 as the valve stem 400 rotates in both directions.

[0032] Continue to refer to Figure 3 The valve seat 200 is located at the lower part of the valve body 100, the valve stem 400 is located at the upper part of the valve body 100, the outlet channel 120 is located at the upper part of the valve seat 200 and communicates with the flow channel 110, and the valve needle 300 is located between the valve stem 400 and the valve seat 200 and can move along the flow channel 110 to open or close the communication between the valve seat channel 210 and the outlet channel 120. Specifically, since the valve stem 400 and the valve needle 300 are screwed together, rotating the valve stem 400 can drive the valve needle 300 to move upward, so that the outlet channel 120 and the valve seat channel 210 are opened, thereby realizing the communication between the two. At this time, fluid flows in from the lower part of the flow channel 110 and enters the valve seat channel 210, and is discharged through the outlet channel 120. The valve stem 400 is rotated in the opposite direction to move the valve needle 300 away from the valve stem 400, thereby causing the valve needle 300 to move downward and blocking the valve seat passage 210 and the outlet passage 120, thus closing the connection between the valve seat passage 210 and the outlet passage 120. The lower part of the outlet passage 120 and the flow passage 110 can be connected to pipes for fluid transmission.

[0033] As can be seen, the constant-volume valve can control the opening and closing of the valve by rotating the valve stem 400 in both directions, which is convenient to operate, effectively improves work efficiency, and expands the application range. The valve needle 300 moves linearly up and down with the rotation of the valve stem 400, and only moves within the sealed cavity formed between the valve stem 400 and the valve seat 200. It only causes fluid movement within the valve body 100, does not cause fluid movement within the connecting pipe, does not disrupt the pressure balance, does not change the internal volume of the sealed cavity, and does not cause pressure changes, effectively ensuring the constant-volume effect.

[0034] like Figure 3 As shown, the flow passage 110 includes a flow guide section 111 and a sealing section 112 that are interconnected. The flow guide section 111 extends from the lower part of the valve body 100 to the sealing section 112, and the sealing section 112 extends from the flow guide section 111 to the upper part of the valve body 100. The outlet passage 120 is connected to the sealing section 112. The valve needle 300 is located in the sealing section 112 and is screwed to the valve stem 400 located in the upper part of the valve body 100. The valve seat 200 is located in the flow guide section 111.

[0035] The valve needle 300 has a gradually narrowing tip at the end opposite to the valve stem 400, which can be inserted into the valve seat channel 210 to block it. The valve needle 300 also has a threaded hole at the end opposite to the valve seat 200 for screwing onto the valve stem 400. The valve needle 300 blocks the outlet channel 120 with its sidewall, and when the valve needle 300 moves upward, the outlet channel 120 and the valve seat channel 210 become connected. Notably, the sealing section 112 is adapted to the cross-sectional shape of the valve needle 300, restricting the valve needle 300 to only vertical movement, thus preventing the valve needle 300 from rotating with the valve stem 400. In one example, both the valve needle 300 and the sealing section 112 have circular cross-sections.

[0036] like Figure 3 As shown, the cross-section of the guide section 111 is larger than the cross-section of the sealing section 112, so that a first step 114 is formed between the guide section 111 and the sealing section 112, and a corner 113 is located between the guide section 111 and the sealing section 112. The valve seat 200 is located inside the guide section 111 and abuts against the connection between the guide section 111 and the sealing section 112, i.e., at the first step 114. Further, the cross-section of the valve seat 200 is adapted to the cross-section of the guide section 111, and the mating surface of the valve seat 200 with the first step 114 is conical, so as to abut against the corner 113 formed between the guide section 111 and the sealing section 112. The valve seat 200 deforms under the action of external force to achieve a sealing connection between the valve seat 200 and the valve body 100, preventing the fluid from flowing back between the guide section 111 and the valve seat 200.

[0037] Optionally, the valve seat 200 is detachably installed within the flow guide section 111 to facilitate installation and replacement, reduce maintenance costs, and improve efficiency and value. Specifically, the constant-volume valve further includes a first locking nut 510, which is located on the side of the valve seat 200 opposite to the valve needle 300 and screwed to the flow guide section 111, allowing the valve seat 200 to be detachably installed between the first step 114 and the first locking nut 510. The first locking nut 510 has a hollow structure to allow fluid to pass through it into the valve seat channel 210.

[0038] Specifically, the mating surface between the valve seat 200 and the first locking nut 510 is also tapered, so that under the pre-tightening pressure of the first locking nut 510, the valve seat 200 is deformed to achieve a seal between the valve seat 200 and the valve body 100.

[0039] like Figure 3 and Figure 4 As shown, the constant-volume valve also includes a sealing assembly 600, which is sleeved between the valve stem 400 and the valve body 100 to improve sealing performance and facilitate the sealing of the valve stem 400 under high-pressure conditions.

[0040] The sealing assembly 600 can be a sealing structure formed by multiple sealing rings, see reference. Figure 5 The sealing assembly 600 includes two first sealing rings 610 and a second sealing ring 620, with the two first sealing rings 610 located on both sides of the second sealing ring 620.

[0041] like Figure 4 As shown, the constant volume valve also includes a first locking member 710 and a second locking member 720. The first locking member 710 and the second locking member 720 are both sleeved on the valve stem 400 and abut against the upper and lower sides of the sealing assembly 600 to lock the sealing assembly 600 and prevent the seal from failing, thus affecting the performance.

[0042] Specifically, the first locking member 710 is provided with a plurality of insertion portions 711, which pass through the sealing assembly 600 to fix the sealing assembly 600 between the first locking member 710 and the second locking member 720. The second locking member 720 may be a nut. Preferably, the plurality of insertion portions 711 are arranged in a circumferential array along the axis of the first locking member 710.

[0043] More specifically, see reference Figure 4The flow channel 110 further includes a control section 115, which is located on the side of the sealing section 112 opposite to the guide section 111. The cross-sectional area of ​​the control section 115 is larger than that of the sealing section 112, so that a second step 116 is formed between the control section 115 and the sealing section 112. The sealing assembly 600 is located within the control section 115, and the second locking member 720 abuts against the second step 116 to fix the sealing assembly 600.

[0044] like Figure 3 As shown, the constant volume valve also includes a second locking nut 520, which is sleeved on the valve stem 400 and screwed to the end of the flow passage 110 opposite to the first locking nut 510, so as to lock the first locking member 710, the second locking member 720 and the sealing assembly 600.

[0045] like Figure 3 As shown, the constant-volume valve further includes a rolling element, which is disposed between the valve stem 400 and the second locking nut 520, and / or between the valve stem 400 and the first locking member 710, changing the sliding friction between them into rolling friction, making the rotation of the valve stem 400 more effortless. The rolling element includes a first steel ball 910 and a second steel ball 920, with the first steel ball 910 located between the second locking nut 520 and the valve stem 400, and the second steel ball 920 located between the first locking member 710 and the valve stem 400.

[0046] Specifically, the valve stem 400 is provided with an abutment portion 410. The first steel ball 910 is located between the abutment portion 410 and the second locking nut 520, and the second steel ball 920 is located between the abutment portion 410 and the first locking member 710. The first steel ball 910 and the second steel ball 920 may be of different sizes; for example, the first steel ball 910 may be larger than the second steel ball 920. By providing the abutment portion 410, not only are the first steel ball 910 and the second steel ball 920 fixed, but the valve stem 400 is also prevented from moving up and down, so the valve stem 400 only rotates.

[0047] like Figure 3 As shown, the constant-volume valve also includes a handle 800. The valve stem 400 extends to one end outside the flow channel 110 and is connected to the handle. The user rotates the handle 800 to rotate the valve stem 400. The handle 800 is fixed to the valve stem 400 by a handle pin 810.

[0048] In summary, the valve needle 300 moves linearly up and down with the rotation of the valve stem 400, and its movement is limited to the sealed cavity formed between the valve stem 400 and the valve seat 200. It only facilitates fluid movement within the valve body 100, without affecting fluid movement within the connecting pipe, disrupting pressure balance, changing the internal volume of the sealed cavity, or causing pressure changes, thus effectively ensuring a constant volume effect. The constant volume valve can control the opening and closing of the valve by rotating the valve stem 400 in both directions, making operation convenient, improving work efficiency, and expanding its application range. Furthermore, a sealing assembly 600 is provided between the valve stem 400 and the flow channel 110, and the sealing assembly 600 and the valve seat 200 are located on opposite sides of the sealing section 112, allowing the valve needle 300 to move up and down within the sealing section 112, improving sealing performance. The valve seat 200 is detachably installed within the guide section 111, facilitating installation and replacement, reducing maintenance costs, and improving efficiency and value.

[0049] In addition, those skilled in the art can also change the shape, structure and material of the valve body 100 and valve seat 200 according to the actual situation. As long as the same or similar technical solutions are adopted on the basis of the above disclosure of the present invention, the same or similar technical problems are solved and the same or similar technical effects are achieved, they all fall within the protection scope of the present invention. The specific embodiments of the present invention are not limited thereto.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and any variations or modifications may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. A constant volume valve for high pressure testing, characterized by, The valve body (100) is provided with a flow passage (110) and an outlet passage (120), the flow passage (110) penetrates the valve body (100) and communicates with the outlet passage (120), the valve seat (200) is detachably installed in the flow passage (110), the valve seat (200) is provided with a valve seat passage (210) penetrating the valve seat (200), the valve needle (300) is slidably arranged in the flow passage (110) and opposite to the valve seat passage (210), the valve stem (400) is rotatably arranged in the flow passage (110), the valve needle (300) can be screwed with the valve stem (400), and the valve needle (300) can move in the flow passage (110) to open and close the communication between the valve seat passage (210) and the outlet passage (120) with the forward and reverse rotation of the valve stem (400); The flow passage (110) comprises a flow guide section (111) and a sealing section (112) in communication with each other, the outlet passage (120) communicates with the sealing section (112), the valve needle (300) is located in the sealing section (112), a first step (114) is formed between the flow guide section (111) and the sealing section (112), and the valve seat (200) is located in the flow guide section (111) and abuts against the first step (114); The first locking nut (510) is screwed on the side of the flow guide section (111) away from the sealing section (112), so that the valve seat (200) is detachably installed between the first step (114) and the first locking nut (510); the valve seat (200) is deformed under the pre-tightening pressure of the first locking nut (510), so as to realize the sealing connection between the valve seat (200) and the valve body (100); The mating surface of the valve seat (200) and the first step (114) is conical, and the mating surface of the valve seat (200) and the first locking nut (510) is conical; The sealing assembly (600) is sleeved between the valve stem (400) and the valve body (100).

2. The constant volume valve for high pressure testing of claim 1, wherein, The first locking member (710) and the second locking member (720) are both sleeved on the valve stem (400) and abut against the upper and lower sides of the sealing assembly (600).

3. The constant volume valve for high pressure testing of claim 2, wherein, The first locking member (710) is provided with a plurality of insertion portions (711), and the insertion portions (711) penetrate the sealing assembly (600).

4. The constant volume valve for high pressure testing of claim 2, wherein, The second locking nut (520) is sleeved on the valve stem (400) and is screwed with the end of the flow passage (110) away from the first locking nut (510) to lock the first locking member (710), the second locking member (720) and the sealing assembly (600).

5. The constant volume valve for high pressure testing of claim 4, wherein, The rolling member is arranged between the valve stem (400) and the second locking nut (520) and / or between the valve stem (400) and the first locking member (710).

6. The constant volume valve for high pressure testing of claim 1, wherein, The handle (800) is connected to the end of the valve stem (400) extending outside the flow passage (110).

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