Stop check valve

Abstract

The utility model relates to a stop check valve, and relates to the technical field of valves, the stop check valve comprises a valve body, a valve cover mounted on the valve body, a valve rod penetrating through the valve cover and extending into the valve body, and a valve clack slidably connected with the valve rod, an execution part is arranged at the outer end of the valve rod, and a valve seat located below the valve clack is arranged in the valve body; a connecting assembly is arranged in the valve body and comprises a limiting sleeve located between the valve clack and the valve rod and an anti-rotation piece arranged on the inner side face of the valve deck, a limiting through groove allowing the valve rod to penetrate through is formed in the limiting sleeve, and the end, away from the valve deck, of the limiting sleeve is fixedly connected with the valve clack. The anti-rotation piece is used for preventing the valve rod from rotating around the axis; compared with the contact area of direct sliding connection of the valve rod and the valve clack, the contact area of the outer circumferential face of the valve rod and the inner wall of the limiting through groove is larger, the stability of the valve rod and the valve clack in the sliding process is improved, and the influence of medium impact on the assembling connection position of the valve clack and the valve rod is reduced.

Description

Technical Field

[0001] The present application relates to a stop check valve, and in particular to a stop check valve. Background Art

[0002] The stop check valve is a multi-purpose valve that has the functions of a stop valve and a check valve. Its structure is similar to that of a stop valve, but the valve stem and the valve disc are not fixedly connected.

[0003] In the related art, the stop check valve includes a valve body, a valve cover, a valve stem and a valve disc. The valve body is provided with a valve cavity and an inlet and outlet fluid channel formed in the transverse direction. The fluid channel runs through the valve cavity. The valve disc is arranged in the valve body and connects the inlet and outlet fluid channels. The valve cover is fixed on the upper end face of the valve body. The valve stem passes through the valve cover and is linked with the valve disc. The valve stem and the valve disc are in sliding fit. When the valve stem descends and presses the valve disc tightly against the valve seat, it acts as a stop valve; after the valve stem rises, it acts as a check valve. When it acts as a check valve and the medium flows forward, the valve disc can slide axially relative to the valve stem under the impact of the medium. At this time, a gap for the medium to flow appears between the valve disc and the valve seat, and it is in an open state; when the medium flows in the reverse direction, the medium squeezes the valve disc. At the same time, due to the influence of the valve disc's own weight, the valve disc of the stop check valve fits the valve seat and is in a closed state.

[0004] Since the medium will continuously impact the valve disc during the use of the stop check valve, the stability of the connection between the valve disc and the valve stem will be affected, and the valve disc and the valve stem may become relatively loose or shaken, especially when the valve body is installed in a non-vertical state and when the weight of the valve disc itself is large, the coaxiality of the valve stem and the valve disc will be more affected. The valve disc will tilt to one side due to gravity, resulting in a gap between the valve disc and the valve seat when in the closed state, causing the stop check valve to have insufficient sealing. There is room for improvement. Utility Model Content

[0005] The purpose of the present application is to provide a stop check valve to solve the problem in the above-mentioned related art that during the use of the stop check valve, the medium will continuously impact the valve disc, which will affect the connection stability between the valve disc and the valve stem, and the valve disc and the valve stem may become relatively loose or shaken. Especially when the valve body is installed in a non-vertical state and when the weight of the valve disc itself is large, the coaxiality of the valve stem and the valve disc will be more affected. The valve disc will tilt to one side due to gravity, resulting in a gap between the valve disc and the valve seat in the closed state, causing the stop check valve to have insufficient sealing.

[0006] The stop check valve provided in this application adopts the following technical solution:

[0007] A stop check valve comprises a valve body with a flow channel, a valve cover installed on the valve body, a valve stem that passes through the valve cover and extends to the inside of the valve body, and a valve disc that is slidably connected to the valve stem and is located inside the valve body, the outer end of the valve stem is provided with an actuator for controlling the depth of the valve stem inserted into the valve body, and the interior of the valve body is provided with a valve seat located below the valve disc; a connecting assembly is provided inside the valve body, and the connecting assembly comprises a limiting sleeve located between the valve disc and the valve stem and an anti-rotation member arranged on the inner side of the valve cover, the limiting sleeve is provided with a limiting groove for the valve stem to pass through, and the end of the limiting sleeve away from the valve cover is fixedly connected to the valve disc; the anti-rotation member is used to prevent the valve stem from rotating around its own axis.

[0008] By adopting the above technical scheme, in the process of connecting the valve stem and the valve disc, through the installation setting of the limiting sleeve, one end of the limiting sleeve is fixedly connected to the valve disc, and the valve stem is inserted into the other end of the limiting sleeve and slidably connected thereto. Compared with the contact area of ​​the direct sliding connection between the valve stem and the valve disc, the contact area between the outer peripheral surface of the valve stem and the inner wall of the limiting groove is larger, thereby realizing an indirect sliding connection between the valve disc and the valve stem, and at the same time, it also improves the stability of the valve stem and the valve disc during the sliding process, and reduces the impact of the medium impact on the assembly connection between the valve disc and the valve stem.

[0009] Optionally, a fixing screw portion is provided at the end of the limiting sleeve close to the valve disc, and a fixing thread groove into which the fixing screw portion is screwed is provided on the valve disc.

[0010] By adopting the above technical solution, during the assembly process of the limit sleeve and the valve disc, the fixed screw portion on the limit sleeve is screwed into the fixed thread groove on the valve disc, thereby facilitating the assembly and fixation of the limit sleeve and the valve disc and improving the assembly efficiency of the limit sleeve and the valve disc.

[0011] Optionally, an anti-rotation positioning piece is sleeved on the fixed screw portion, and a first folding piece bent toward the valve flap is provided on the outer peripheral edge of the anti-rotation positioning piece, and a first abutting surface that fits with the first folding piece is provided on the valve flap; a second folding piece bent toward the limiting sleeve is provided on the outer peripheral edge of the anti-rotation positioning piece, and a second abutting surface that fits with the second folding piece is provided on the outer peripheral surface of the limiting sleeve.

[0012] By adopting the above technical solution, an anti-rotation positioning plate is installed between the fixed screw part and the valve disc, and the first folding plate is bent using a tool to fit it with the first abutting surface on the valve disc, and the second folding plate is bent and fits it with the second abutting surface on the limiting sleeve. This arrangement reduces the possibility of loosening of the fixed screw part that has been tightened in the fixed thread groove.

[0013] Optionally, the anti-rotation component includes a guide anti-rotation slide rod and an anti-rotation frame fixedly mounted on the outer circumference of the valve stem, one end of the guide anti-rotation slide rod is fixed to the inner side surface of the valve cover, and the anti-rotation frame is provided with a guide groove for the guide anti-rotation slide rod to pass through and slide.

[0014] By adopting the above technical solution, when the valve stem moves along its own length direction, the anti-rotation frame is simultaneously driven to move, and the anti-rotation frame can only slide along the length direction of the guide anti-rotation slide rod, so that the valve stem can only slide along its own length direction and cannot rotate around its own axis, thereby reducing the situation where the valve stem cannot be moved and adjusted due to the self-rotation of the valve stem, thereby improving the performance of the stop check valve.

[0015] Optionally, the outer circumferential surface of the limiting sleeve is provided with a guide limiting groove for inserting the guide anti-rotation sliding rod.

[0016] By adopting the above technical solution, when the medium impacts the valve disc, the valve disc and the limit sleeve may move away from the valve seat. Since the guide anti-rotation slide rod is inserted into the guide limit groove on the limit sleeve, the sliding process of the limit sleeve is limited, so that the limit sleeve can only slide along the length direction of the guide anti-rotation slide rod, thereby preventing the limit sleeve and the valve disc from rotating relative to the valve stem under the impact of the medium, thereby further improving the assembly stability of the valve stem and the valve disc.

[0017] Optionally, a first screw portion is provided at the end of the guide anti-rotation slide rod close to the valve cover, a first thread groove for the first screw portion to be screwed into is provided on the inner side surface of the valve cover, and a stop pad is sleeved on the first screw portion.

[0018] By adopting the above technical solution, during the assembly process of the guide anti-rotation slide bar and the valve cover, the first screw portion on the guide anti-rotation slide bar is screwed into the first threaded groove on the valve cover, and then the anti-retraction pad is used to reduce the possibility of loosening of the tightened first screw portion in the first threaded groove. This arrangement facilitates the assembly and fixation of the guide anti-rotation slide bar and the valve cover, and also improves the installation stability of the guide anti-rotation slide bar.

[0019] Optionally, an elastic sealing ring is provided on the side of the valve disc, and a sealing ring groove for the elastic sealing ring to be installed is opened on the side of the valve disc close to the valve seat.

[0020] By adopting the above technical solution, when installing the elastic sealing ring, the elastic sealing ring is installed inside the sealing ring groove on the valve disc; when the stop check valve is in a closed state, the side of the valve disc away from the valve stem abuts against the valve seat, and the elastic sealing ring abuts against the edge of the valve seat, and the sealing performance of the stop check valve in the closed state is improved through the double sealing setting of soft sealing and hard sealing.

[0021] Optionally, an annular pressure plate for fastening the elastic sealing ring and a plurality of fastening bolts for fastening the annular pressure plate are provided on the side of the valve disc away from the valve stem, and a double-ear stop washer located on the side of the annular pressure plate away from the valve disc is sleeved on the fastening bolts.

[0022] By adopting the above technical solution, when the elastic sealing ring is fixed and limited, the elastic sealing ring is first squeezed by using an annular pressure plate, and then the annular pressure plate is fixed to the valve disc by using bolts, so as to achieve the installation and fixation of the elastic sealing ring and improve the installation stability of the elastic sealing ring; and due to the installation setting of the double-ear stop washer, the possibility of the tightening bolts loosening again after being tightened is reduced.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. Through the installation of the limiting sleeve, the contact area between the outer peripheral surface of the valve stem and the inner wall of the limiting groove is larger than the contact area of ​​the direct sliding connection between the valve stem and the valve disc, thereby realizing an indirect sliding connection between the valve disc and the valve stem. At the same time, it also improves the stability of the valve stem and the valve disc during the sliding process, and reduces the impact of the medium impact on the assembly connection between the valve disc and the valve stem.

[0025] 2. Through the setting of the elastic sealing ring, when the stop check valve is in a closed state, the side of the valve disc away from the valve stem abuts against the valve seat, and the elastic sealing ring abuts against the edge of the valve seat. The double sealing setting of soft seal and hard seal improves the sealing performance of the stop check valve in a closed state. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0028] Figure 2 It is a schematic cross-sectional structure diagram of the installation and cooperation between the valve disc and the valve stem in the embodiment of the present application;

[0029] Figure 3 It is a partial cross-sectional structural schematic diagram of the embodiment of the present application showing the installation and cooperation between the valve disc and the valve stem;

[0030] Figure 4 It is a partial structural diagram of the installation and matching of the limiting sleeve in the embodiment of the present application;

[0031] Figure 5It is a partial structural diagram of the installation and coordination of the anti-rotation component in the embodiment of the present application;

[0032] Figure 6 It is a structural schematic diagram of the installation distribution of the anti-retraction pad and the guide anti-rotation slide bar in the embodiment of the present application;

[0033] Figure 7 It is a partial cross-sectional structural schematic diagram of the embodiment of the present application embodying the installation and cooperation of the elastic sealing ring;

[0034] Figure 8 yes Figure 7 Enlarged schematic diagram of part A.

[0035] In the figure, 1, valve body; 11, flow channel; 12, valve seat; 2, valve stem; 21, actuator; 211, operating handle; 212, adjusting nut; 3, valve cover; 31, first thread groove; 4, connecting assembly; 41, limiting sleeve; 411, limiting through groove; 412, fixing screw portion; 413, second abutting surface; 414, guide limiting groove; 42, anti-rotation member; 421, anti-rotation frame; 4211, guide through groove Groove; 422, guide anti-rotation slide rod; 4221, first screw portion; 423, anti-retraction pad; 43, anti-rotation positioning plate; 431, first folding piece; 432, second folding piece; 5, valve disc; 51, fixed thread groove; 52, first abutment surface; 53, sealing ring groove; 54, fastening bolt; 55, annular pressure plate; 551, first through hole; 56, second thread groove; 57, double-ear stop washer; 6, elastic sealing ring. DETAILED DESCRIPTION

[0036] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0037] Example:

[0038] Reference Figure 1 and Figure 2 , a stop check valve, comprising a valve body 1 with a flow channel 11, a valve cover 3 installed on the valve body 1, a valve stem 2 penetrating the valve cover 3 and extending into the interior of the valve body 1, and a valve disc 5 slidably connected to the valve stem 2 and located inside the valve body 1, the two end openings of the flow channel 11 are respectively a feed port and a discharge port, an outer end portion of the valve stem 2 is provided with an actuator 21 for controlling the depth of the valve stem 2 inserted into the valve body 1, and the interior of the valve body 1 is provided with a valve seat 12 located below the valve disc 5; when the stop check valve acts as a check valve and the medium flows in a forward direction, the valve disc 5 can slide in a direction away from the valve seat 12 under the impact of the medium; when the medium flows in a reverse direction, the medium squeezes the valve disc 5, and at the same time, due to the influence of the self-weight of the valve disc 5, the valve disc 5 is pressed against the valve seat 12, so that the stop check valve is in a closed state.

[0039] Reference Figure 2The actuator 21 includes an operating handle 211 and an adjusting nut 212. The adjusting nut 212 is threadedly sleeved on the threaded portion on the circumferential surface of the outer end of the valve stem 2. The valve stem 2 remains stationary. The operating handle 211 drives the adjusting nut 212 to rotate relative to the screw rod, thereby adjusting the length of the valve stem 2 in the valve body 1. This is a conventional structure and will not be described in detail here.

[0040] Reference Figure 2 and Figure 3 A connecting assembly 4 is provided inside the valve body 1, and the connecting assembly 4 includes a limiting sleeve 41 located between the valve disc 5 and the valve stem 2 and an anti-rotation component 42 arranged on the inner side of the valve cover 3. The limiting sleeve 41 is used to ensure the coaxiality between the valve disc 5 and the valve stem 2, and the anti-rotation component 42 is used to prevent the valve stem 2 from rotating when adjusting the depth of insertion into the valve body 1.

[0041] Reference Figure 3 and Figure 4 A limiting through groove 411 for the valve stem 2 to pass through is provided on the limiting sleeve 41, and the end of the limiting sleeve 41 away from the valve cover 3 is fixedly connected to the valve disc 5; wherein a fixing screw portion 412 is provided at the end of the limiting sleeve 41 close to the valve disc 5, and a fixing threaded groove 51 is provided on the valve disc 5 for the fixing screw portion 412 to be screwed into, thereby realizing the assembly and fixation of the limiting sleeve 41 and the valve disc 5; and an anti-rotation positioning sheet 43 is sleeved on the fixing screw portion 412.

[0042] Reference Figure 4 A first folding piece 431 is provided on the outer peripheral edge of the anti-rotation positioning piece 43, which is bent toward the valve disc 5, and a first abutting surface 52 which is in contact with the first folding piece 431 is provided on the valve disc 5; a second folding piece 432 is provided on the outer peripheral edge of the anti-rotation positioning piece 43, which is bent toward the limiting sleeve 41, and a second abutting surface 413 which is in contact with the second folding piece 432 is provided on the outer peripheral surface of the limiting sleeve 41, so as to reduce the possibility of loosening of the tightened fixing screw part 412 in the fixing thread groove 51.

[0043] Reference Figure 3 and Figure 4 The anti-rotation component 42 includes two guide anti-rotation slide bars 422 and an anti-rotation frame 421 which is fixedly sleeved on the outer peripheral surface of the valve stem 2 by pins, wherein one end of the guide anti-rotation slide bar 422 is fixed to the inner side surface of the valve cover 3, and a first screw portion 4221 is provided at the end of the guide anti-rotation slide bar 422 close to the valve cover 3, and a first threaded groove 31 for the first screw portion 4221 to be screwed into is provided on the inner side surface of the valve cover 3, so as to realize the assembly and fixation of the guide anti-rotation slide bar 422 and the valve cover 3; and a guide through groove 4211 is provided on the anti-rotation frame 421 for the guide anti-rotation slide bar 422 to penetrate and slide, and when the valve stem 2 moves along its own length direction, the anti-rotation frame 421 is synchronously driven to move.

[0044] Reference Figure 5 and Figure 6 The first screw portion 4221 is fixedly sleeved with a stop pad 423. Figure 3 ) is screwed into the first thread groove 31 (see Figure 3 ), use a tool to bend the edge of the stop pad 423 toward the side close to the valve cover 3, so as to lower the first screw portion 4221 (see Figure 3 ) in the first thread groove 31 (see Figure 3 The outer circumference of the limiting sleeve 41 is provided with a guide limiting groove 414 for the guide anti-rotation slide rod 422 to be inserted, so as to prevent the limiting sleeve 41 and the valve disc 5 from rotating relative to the valve stem 2 under the impact of the medium, and further improve the assembly stability of the valve stem 2 and the valve disc 5.

[0045] Reference Figure 7 , an elastic sealing ring 6 is provided on the side of the valve disc 5, and the elastic sealing ring 6 is made of polytetrafluoroethylene, wherein the valve disc 5 is close to the valve seat 12 (see Figure 2 ) is provided with a sealing ring groove 53 for installing the elastic sealing ring 6; an annular pressure plate 55 for fastening the elastic sealing ring 6 and a plurality of fastening bolts 54 for fastening the annular pressure plate 55 are provided on the side of the valve disc 5 away from the valve stem 2. The annular pressure plate 55 squeezes and limits the inner ring edge of the elastic sealing ring 6, and a plurality of first through holes 551 for screwing the fastening bolts 54 are evenly distributed on the annular pressure plate 55. A plurality of second threaded grooves 56 are provided on the side of the valve disc 5 away from the valve stem 2. The fastening bolts 54 penetrate the annular pressure plate 55 and are screwed into the second threaded grooves 56 on the valve disc 5, thereby fastening the elastic sealing ring 6.

[0046] Reference Figure 7 and Figure 8 A double-ear stop washer 57 is sleeved on the outer circumferential surface of the fastening bolt 54, and the double-ear stop washer 57 is located between the fastening bolt 54 and the annular pressure plate 55, wherein one ear of the double-ear stop washer 57 is bent toward the inner side of the annular pressure plate 55, and the other ear of the double-ear stop washer 57 is bent toward the nut portion of the fastening bolt 54, thereby reducing the possibility of the fastening bolt 54 becoming loose again after being tightened.

[0047] The implementation principle of the embodiment of the present application is:

[0048] When the stop check valve acts as a check valve and the medium flows in the forward direction, the valve flap 5 can slide in the direction away from the valve seat 12 under the impact of the medium; when the medium flows in the reverse direction, the medium squeezes the valve flap 5, and at the same time, due to the influence of the valve flap 5's own weight, the valve flap 5 and the valve seat 12 are pressed tightly, so that the stop check valve is in a closed state;

[0049] By cooperating with the anti-rotation part 42 and the limiting sleeve 41, the assembly stability of the valve stem 2 and the valve disc 5 is enhanced, and the influence of the medium impact on the assembly connection between the valve disc 5 and the valve stem 2 is reduced; when the stop check valve is in a closed state, the side of the valve disc 5 away from the valve stem 2 abuts against the valve seat 12, and the elastic sealing ring 6 abuts against the edge of the valve seat 12, and the double sealing setting of the soft seal and the hard seal is used to improve the sealing performance of the stop check valve in the closed state.

[0050] Unless otherwise defined, the terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The "first", "second", "third" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and other similar words do not indicate a quantitative limit, but indicate that there is at least one. "Including" or "comprising" and other similar words mean that the elements or objects appearing in front of "including" or "comprising" cover the elements or objects listed after "including" or "comprising" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0051] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A stop check valve, comprising a valve body (1) having a flow channel (11), a valve cover (3) mounted on the valve body (1), a valve stem (2) penetrating the valve cover (3) and extending into the interior of the valve body (1), and a valve flap (5) slidably connected to the valve stem (2) and located inside the valve body (1), an actuator (21) for controlling the depth of the valve stem (2) inserted into the valve body (1) is provided at the outer end of the valve stem (2), and a valve seat (12) located below the valve flap (5) is provided inside the valve body (1); It is characterized in that A connecting assembly (4) is provided inside the valve body (1), and the connecting assembly (4) includes a limiting sleeve (41) located between the valve disc (5) and the valve stem (2) and an anti-rotation component (42) arranged on the inner side of the valve cover (3); the limiting sleeve (41) is provided with a limiting groove (411) for the valve stem (2) to pass through, and the end of the limiting sleeve (41) away from the valve cover (3) is fixedly connected to the valve disc (5); the anti-rotation component (42) is used to prevent the valve stem (2) from rotating around the axis.

2. A stop check valve according to claim 1, characterized in that: The end of the limiting sleeve (41) close to the valve flap (5) is provided with a fixing screw portion (412), and the valve flap (5) is provided with a fixing thread groove (51) into which the fixing screw portion (412) is screwed.

3. A stop check valve according to claim 2, characterized in that: An anti-rotation positioning piece (43) is sleeved on the fixed screw portion (412), a first folding piece (431) bent in a direction close to the valve flap (5) is provided on the outer peripheral edge of the anti-rotation positioning piece (43), and a first abutting surface (52) abutting against the first folding piece (431) is provided on the valve flap (5); A second folding piece (432) is provided on the outer peripheral edge of the anti-rotation positioning piece (43) and is bent toward the limiting sleeve (41). The outer peripheral surface of the limiting sleeve (41) is provided with a second abutting surface (413) that is in contact with the second folding piece (432).

4. A stop check valve according to claim 1, characterized in that: The anti-rotation component (42) comprises a guide anti-rotation slide bar (422) and an anti-rotation frame (421) fixedly sleeved on the outer peripheral surface of the valve stem (2); one end of the guide anti-rotation slide bar (422) is fixed to the inner side surface of the valve cover (3); and the anti-rotation frame (421) is provided with a guide groove (4211) for the guide anti-rotation slide bar (422) to pass through and slide.

5. A stop check valve according to claim 4, characterized in that: The outer peripheral surface of the limiting sleeve (41) is provided with a guide limiting groove (414) for the guide anti-rotation sliding rod (422) to be inserted.

6. A stop check valve according to claim 5, characterized in that: The end of the guide anti-rotation sliding rod (422) close to the valve cover (3) is provided with a first screw rod portion (4221), the inner side surface of the valve cover (3) is provided with a first thread groove (31) for the first screw rod portion (4221) to be screwed into, and the first screw rod portion (4221) is sleeved with a stop pad (423).

7. The stop check valve according to claim 1, characterized in that: An elastic sealing ring (6) is provided on the side of the valve flap (5), and a sealing ring groove (53) for the elastic sealing ring (6) to be installed is provided on the side of the valve flap (5) close to the valve seat (12).

8. A stop check valve according to claim 7, characterized in that: An annular pressure plate (55) for fastening the elastic sealing ring (6) and a plurality of fastening bolts (54) for fastening the annular pressure plate (55) are provided on the side of the valve disc (5) away from the valve stem (2), and a double-ear stop washer (57) located on the side of the annular pressure plate (55) away from the valve disc (5) is sleeved on the fastening bolts (54).

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