Liquid flow control valve

Abstract

The utility model discloses a liquid flow control valve which comprises a valve body, a valve cover, a valve seat, a valve rod, a valve element and an executing mechanism. An inflow channel, an outflow channel and a mounting valve port connecting the inflow channel and the outflow channel are arranged in the valve body, and an upper opening is formed in the top of the valve body; the valve seat is arranged in the valve body and is provided with a guide section and a sealing section which are distributed up and down, the sealing section is supported on the mounting valve port, the side wall of the guide section is provided with an opening for a medium to flow out, and the upper end of the guide section extends upwards to the upper opening; the valve cover is arranged on the upper opening and abuts against the upper end of the guide section at the same time, the valve seat is pressed downwards, and the sealing section of the valve seat is pressed on the installation valve port. After the valve core moves downwards, the lower end of the valve core is blocked on the sealing section; the lower end of the valve rod is connected with the valve element, the upper end of the valve rod penetrates through the valve cover and then is connected with the executing mechanism, and the executing mechanism drives the valve rod and the valve element to move up and down. The stability of the valve element can be remarkably improved, so that the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of control valves, in particular to a liquid flow control valve. Background Art

[0002] The flow control valve is a multifunctional valve that uses a high-precision pilot method to control the flow. It is suitable for water distribution pipes that need to control flow and pressure. It keeps the predetermined flow unchanged, limits excessive flow to a predetermined value, and appropriately reduces the upstream high pressure. Even if the pressure upstream of the main valve changes, it will not affect the flow downstream of the main valve. Its connection methods are divided into flange type, threaded type, and welding type. The control and adjustment methods are divided into automatic and manual.

[0003] The structure of the flow control valve mainly includes a valve body, a valve seat, a valve stem and an actuator. The valve seat is arranged on the mounting valve port in the valve body. The middle and upper parts of the valve stem are lifted and matched in the top position of the valve seat. The upper end is connected to the actuator and is driven up and down by the actuator. The bottom of the valve stem has a valve core. When the valve stem moves downward, the valve core is blocked on the valve hole of the valve seat to close the valve hole. When the valve stem moves upward, the valve core is separated from the valve hole of the valve seat and the valve hole is opened. In the current flow control valve structure, when the valve hole is opened, the fluid medium will impact the valve core, exerting a certain impact force on the valve core and the valve stem, while the valve core at the lower end of the valve stem is in a suspended state. After long-term use and impact, the valve core is prone to shaking, resulting in loosening of the coordination between the structures, causing sealing problems and reducing the service life of the flow control valve. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a liquid flow control valve, which can significantly improve the stability of the valve core to increase the service life.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A liquid flow control valve, characterized in that it comprises a valve body, a valve cover, a valve seat, a valve stem, a valve core and an actuator;

[0007] The valve body is provided with an inflow channel, an outflow channel and a mounting valve port connecting the inflow channel and the outflow channel, and the top of the valve body is provided with an upper opening;

[0008] The valve seat is arranged in the valve body and has a guide section and a sealing section distributed up and down, the sealing section is supported on the mounting valve port, the side wall of the guide section has an opening for the medium to flow out, and the upper end of the guide section extends upward to the upper opening;

[0009] The valve cover is arranged on the upper opening and pressed against the upper end of the guide section to press the valve seat downward so that the sealing section of the valve seat is pressed tightly against the installation valve port;

[0010] The valve core is lifted and matched in the guide section, and after the valve core moves downward, the lower end is sealed on the sealing section;

[0011] The lower end of the valve stem is connected to the valve core, and the upper end is connected to the actuator after passing through the valve cover, and the valve stem and the valve core are driven by the actuator to move up and down.

[0012] Preferably, an inner installation step is provided on the inner wall of the installation valve port, and an outer installation step is provided on the outer wall of the sealing section, and the outer installation step is supported on the inner installation step.

[0013] Preferably, the upper inner wall of the sealing section has a first sealing slope, and the lower outer wall of the valve core has a second sealing slope that matches the first sealing slope.

[0014] Preferably, a limiting inner step is provided on the inner wall of the sealing section, and the limiting inner step is located below the first sealing inclined surface to provide support for the bottom surface of the valve core.

[0015] Preferably, the sealing section is provided with an avoidance groove at a position corresponding to the connection between the first sealing inclined surface and the limiting inner step.

[0016] Preferably, the valve core comprises a sealing plug, a connecting block, a spring and a cap;

[0017] The sealing plug is fitted in the guide section, and a connecting hole is provided on the top of the sealing plug;

[0018] The connecting block is fitted in the connecting hole and can move up and down, and the lower end of the valve stem passes through the connecting block and is fixed with the connecting block by threaded fit;

[0019] The spring is sleeved on the valve stem and is located below the connecting block, the upper end of the spring abuts against the connecting block, and the lower end abuts against the inner step of the connecting hole;

[0020] The cover cap is arranged on the top of the connecting hole to limit the connecting block in the connecting hole.

[0021] Preferably, a first sealing ring is provided between the inner wall of the guide section and the outer wall of the valve core, the first sealing ring is located above the opening, and a second sealing ring is provided between the inner wall of the upper opening and the outer wall of the valve seat.

[0022] The advantages of the utility model are:

[0023] 1. The entire valve core is in the guide section and is supported by a stable force in the horizontal direction. Therefore, it can remain stable even if it is impacted by the medium, ensuring sealing and increasing service life;

[0024] 2. The setting of the inner step of the limiter can avoid the problem of the first sealing bevel surface excessively squeezing the second sealing bevel surface and causing deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A cross-sectional view of the liquid flow control valve provided in this embodiment;

[0026] Figure 2 A three-dimensional diagram of the liquid flow control valve provided in this embodiment. DETAILED DESCRIPTION

[0027] Combination Figure 1 to Figure 2 The liquid flow control valve of the utility model is further described.

[0028] A liquid flow control valve is characterized by comprising a valve body 1, a valve cover 2, a valve seat 6, a valve stem 3, a valve core 5 and an actuator 7.

[0029] The valve body 1 has an inflow channel 12, an outflow channel 11, and a mounting valve port 13 connecting the inflow channel 12 and the outflow channel 11. The top of the valve body 1 has an upper opening, and the upper opening is located directly above the mounting valve port 13. The valve seat 6 is arranged in the valve body 1, and has a guide section 61 and a sealing section 62 distributed up and down. The sealing section 62 is supported on the mounting valve port 13, and the outer side wall of the sealing section 62 is in contact with the inner side wall of the mounting valve port 13. The side wall of the guide section 61 has an opening 63 for medium to flow out, and the opening 63 has three or four openings that are evenly distributed around the center of the guide section 61; the upper end of the guide section 61 extends upward to the upper opening, and the outer side wall of the guide section 61 is in contact with the inner side wall of the upper opening. The valve cover 2 is arranged on the upper opening of the valve body 1, and at the same time presses against the upper end of the guide section 61, pressing the valve seat 6 downward, so that the sealing section 62 of the valve seat 6 is pressed tightly against the installation valve port 13, and the sealing section 62 and the installation valve port 13 are kept sealed while the valve seat 6 is fixed. The valve core 5 is lifted and matched in the guide section 61, and after the valve core 5 moves downward, the lower end is blocked on the sealing section 62, closing the valve hole 624 on the sealing section 62. The lower end of the valve stem 3 is connected to the valve core 5, and the upper end is connected to the actuator 7 after passing through the valve cover 2, and the valve stem 3 and the valve core 5 are driven by the actuator 7 to move up and down. The actuator 7 is a prior art, so it is not described in detail in this embodiment.

[0030] In the fixing structure of the valve seat 6, the inner wall of the valve port 13 is provided with an inner mounting step, and the outer wall of the sealing section 62 is provided with an outer mounting step, and the outer mounting step is supported on the inner mounting step to provide an upward supporting force for the valve seat 6, and the valve seat 6 is fixed in cooperation with the valve cover 2. During installation, in order to improve the sealing between the two, a sealant may be applied on the outer wall of the sealing section 62.

[0031] A gasket 8 is provided between the lower surface of the valve cover 2 and the upper end of the valve seat 6 , and the gasket 8 can improve the stability of the valve cover 2 pressing down on the valve seat 6 .

[0032] The valve cover 2 is screwed onto the upper opening at the top of the valve body 1 by means of bolts, so as to close the upper opening and fix the valve seat 6 in the valve body 1 at the same time.

[0033] A guide tube 4 is provided in the valve cover 2 , and the middle and upper section of the valve stem 3 fits in the guide tube 4 to ensure the stability of the valve stem 3 in moving up and down.

[0034] In the sealing structure between the sealing section 62 and the valve core 5, the inner diameter of the sealing section 62 is smaller than the inner diameter of the guide section 61, so the inner wall of the sealing section 62 protrudes from the inner wall of the guide section 61. A first sealing slope 621 is provided on the inner wall of the upper end of the sealing section 62, and the inner diameter of the first sealing slope 621 gradually decreases from top to bottom; a second sealing slope 55 is provided on the outer wall of the lower end of the valve core 5 to match the first sealing slope 621, and the slope of the second sealing slope 55 is the same as that of the first sealing slope 621, so when the valve core 5 moves to the lowest position, the second sealing slope 55 just fits on the first sealing slope 621 to achieve sealing between the two.

[0035] The inner wall of the sealing section 62 is provided with a limiting inner step 623, which is located below the first sealing slope 621 and is provided to support the bottom surface of the valve core 5. When the valve core 5 moves to the lowest position, that is, when the second sealing slope 55 is attached to the first sealing slope 621, the bottom surface of the valve core 5 is also supported on the limiting inner step 623, which supports the valve core 5. When the valve stem 3 is accidentally over-pressed, the limiting inner step 623 can support the valve core 5, protect the first sealing slope 621 and the second sealing slope 55, and improve the service life of the utility model.

[0036] The sealing section 62 is provided with an escape groove 622 at a position corresponding to the connection between the bottom of the first sealing inclined surface 621 and the limiting inner step 623. The setting of the escape groove 622 enables the bottom wall of the valve core 5 to stably abut against the limiting inner step 623.

[0037] The valve core 5 structure includes a sealing plug 54, a connecting block 52, a spring 53 and a cap 51. The sealing plug 54 is guided and matched in the guide section 61. The top of the sealing plug 54 has a connecting hole 541 and a surrounding wall 542 arranged around the top opening of the connecting hole 541. The surrounding wall 542 has an external thread. The connecting block 52 is matched in the connecting hole 541 and can move up and down. The matching structure of the connecting block 52 and the connecting hole 541 is a polygonal structure, such as a quadrilateral or a hexagon, so that the circumferential rotation of the connecting block 52 in the connecting hole 541 can be limited. The lower end of the valve stem 3 passes through the connecting block 52 and is threadedly connected to the connecting block 52, so that the valve stem 3 can drive the connecting block 52 to rise and fall synchronously in the connecting hole 541. The spring 53 is sleeved on the valve stem 3 and is located below the connecting block 52. The upper end of the spring 53 abuts against the connecting block 52, and the lower end abuts against the inner step of the connecting hole 541, providing an upward thrust to the connecting block 52 and the valve stem 3. The cap 51 is threadedly fitted on the surrounding wall 542 and is located at the top of the connecting hole 541. The central hole of the cap 51 is smaller than the diameter of the connecting block 52 to limit the connecting block 52 in the connecting hole 541. In the natural state, the spring 53 pushes the connecting block 52 upward, so that the connecting block 52 abuts against the cap 51, so that the connecting block 52 is in the highest position. When the valve stem 3 is pressed down normally, the valve stem 3 moves down normally through the connecting block 52 and the spring 53 pressing down the sealing plug 54, and the valve hole 624 on the sealing section 62 is closed. When the valve stem 3 is accidentally over-pressed, since the bottom wall of the sealing plug 54 is supported on the inner limit step 623 and has a large supporting force, the valve stem 3 will continue to move downward, and the spring 53 will be compressed to play a buffering and protective role.

[0038] In order to ensure the sealing performance, a first sealing ring 8 is arranged between the inner side wall of the guide section 61 and the outer side wall of the valve core 5. The first sealing ring 8 is located above the opening 63. The first sealing ring 8 is arranged on the sealing plug 54, and the retaining ring presses the first sealing ring 8 against the step of the outer side wall of the sealing plug 54. A second sealing ring 9 is arranged between the inner side wall of the upper opening and the outer side wall of the valve seat 6. The second sealing ring 9 is arranged on the outer side wall of the guide section 61.

[0039] During use, the entire valve core 5 is in the guide section 61 within the up and down stroke range, and is subjected to stable support force in the horizontal direction. Therefore, it can remain stable even if it is impacted by the medium for a long time, thereby ensuring the sealing and improving the service life; the setting of the inner step 623 can avoid the problem of deformation caused by excessive squeezing of the first sealing bevel 55 by the second sealing bevel, thereby further ensuring the sealing and service life of the utility model.

[0040] Unless otherwise specified, in the present utility model, if there are terms such as "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicating orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the orientation or position relationship in the present utility model are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood in conjunction with the drawings and according to specific circumstances.

[0041] Unless otherwise specified and limited, in the present invention, the terms "disposed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A liquid flow control valve, characterized in that: Including valve body, valve cover, valve seat, valve stem, valve core and actuator; The valve body is provided with an inflow channel, an outflow channel and a mounting valve port connecting the inflow channel and the outflow channel, and the top of the valve body is provided with an upper opening; The valve seat is arranged in the valve body and has a guide section and a sealing section distributed up and down, the sealing section is supported on the mounting valve port, the side wall of the guide section has an opening for the medium to flow out, and the upper end of the guide section extends upward to the upper opening; The valve cover is arranged on the upper opening and pressed against the upper end of the guide section to press the valve seat downward so that the sealing section of the valve seat is pressed tightly against the installation valve port; The valve core is lifted and matched in the guide section, and after the valve core moves downward, the lower end is sealed on the sealing section; The lower end of the valve stem is connected to the valve core, and the upper end is connected to the actuator after passing through the valve cover, and the valve stem and the valve core are driven by the actuator to move up and down.

2. The liquid flow control valve according to claim 1, characterized in that: An inner installation step is provided on the inner wall of the installation valve port, and an outer installation step is provided on the outer wall of the sealing section, and the outer installation step is supported on the inner installation step.

3. The liquid flow control valve according to claim 1, characterized in that: The upper inner wall of the sealing section is provided with a first sealing inclined surface, and the lower outer wall of the valve core is provided with a second sealing inclined surface matching the first sealing inclined surface.

4. The liquid flow control valve according to claim 3, characterized in that: A limiting inner step is provided on the inner wall of the sealing section, and the limiting inner step is located below the first sealing inclined surface and is used for supporting the bottom surface of the valve core.

5. The liquid flow control valve according to claim 4, characterized in that: The sealing section is provided with an avoidance groove at a position corresponding to the connection between the first sealing inclined surface and the limiting inner step.

6. The liquid flow control valve according to claim 1, characterized in that: The valve core comprises a sealing plug, a connecting block, a spring and a cap; The sealing plug is fitted in the guide section, and a connecting hole is provided on the top of the sealing plug; The connecting block is fitted in the connecting hole and can move up and down, and the lower end of the valve stem passes through the connecting block and is fixed with the connecting block by threaded fit; The spring is sleeved on the valve stem and is located below the connecting block, the upper end of the spring abuts against the connecting block, and the lower end abuts against the inner step of the connecting hole; The cover cap is arranged on the top of the connecting hole to limit the connecting block in the connecting hole.

7. The liquid flow control valve according to claim 1, characterized in that: A first sealing ring is arranged between the inner side wall of the guide section and the outer side wall of the valve core, and the first sealing ring is located above the opening. A second sealing ring is arranged between the inner side wall of the upper opening and the outer side wall of the valve seat.

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