A ball check valve

Abstract

This invention belongs to the field of check valve technology, specifically a float-type check valve, including a valve body, a mounting base, a float housing, and a hollow float. The float housing is rotatably assembled via a spherical seat on the mounting base. A ball bearing is provided between the spherical seat and the ball head of the float housing, allowing the float housing to automatically adjust its verticality when the valve body is tilted, maintaining its central axis perpendicular to the horizontal plane. The float housing has a through hole communicating with the inlet, a spherical cavity accommodating the float, and a through groove communicating with the outlet. A branch channel extending to the valve seat sealing surface is opened on the inner wall of the through hole, which can assist in pushing the float open during forward flow. A multi-stage staggered-hole throttling disc is provided on the inner side of the outlet end to reduce the reverse flow velocity. The float housing adopts a split plug-in structure. This invention solves the problems of poor sealing, difficulty in opening under low pressure, and susceptibility to water hammer in traditional float valves installed at tilted angles. It has advantages such as reliable sealing, sensitive response, and adaptability to complex installation environments.

Description

Technical Field

[0001] This invention belongs to the field of check valve technology, specifically a float-type check valve. Background Technology

[0002] Small-flow float check valves are common low-flow-rate fluid control devices, mainly used in pipeline systems to prevent backflow of media. Their basic working principle is based on a hollow float that can move freely within the valve cavity as the opening and closing element. When the media flows in the forward direction, the flow channel is open for normal drainage; when the flow reverses, the float rises under the action of the reverse fluid and contacts the valve seat to form a seal, thus blocking the backflow. They are widely used in pipelines in water supply and drainage fields, relying on the vertical movement of the float to achieve a one-way shut-off function.

[0003] Currently, existing float-type check valves have the following drawbacks: When the valve is installed in an environment with an uneven foundation, the valve body tilts, and the float and valve seat of the traditional structure cannot self-adjust. This causes a deviation between the direction of the fluid force on the float and the normal direction of the valve seat sealing surface, making it impossible to form a uniform and vertical clamping force. This easily leads to poor sealing and media leakage, severely limiting its reliability and safety in critical fields such as maritime and river transport. Furthermore, when the reverse fluid keeps the float and valve seat in contact for a long time, the float will generate an adsorption force with the valve seat due to particle accumulation. When starting under low pressure or low flow conditions, the driving force of the forward fluid may not be sufficient to overcome the viscous force formed between the float and valve seat due to media adhesion, static conditions, or impurity accumulation. This results in slow valve opening or even failure to open normally, affecting the system response speed and operating efficiency. Therefore, a float-type check valve is proposed to address the above problems. Summary of the Invention

[0004] To overcome the shortcomings of existing float-type check valves, a new type of float-type check valve is proposed.

[0005] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a float-type check valve, comprising a valve body, the valve body including an inlet end and an outlet end, a float housing being assembled in the valve body via a mounting seat, the top opening of the mounting seat communicating with the inlet end, the float housing being rotatably assembled with the mounting seat via a spherical seat on the mounting seat, the two ends of the float housing communicating with the inlet end and the outlet end respectively, the lower part of the float housing being assembled with a hollow float via a provided spherical cavity, and the upper part of the float housing forming a valve seat portion that cooperates with the hollow float to block the outlet end and the inlet end, when the valve body is tilted, the float housing can rotate relative to the valve body via the spherical seat, and the central axis of the float housing is perpendicular to the horizontal line.

[0006] Preferably, the spherical seat is detachably assembled with the mounting base by screws, the float shell includes a ball head rotatably assembled with the spherical seat, and a plurality of balls for universal rotation of the ball head are rotatably assembled on the spherical inner wall of the spherical seat opposite to the outer spherical surface of the ball head, and a through hole is opened in the ball head to communicate with the inlet end and the spherical cavity.

[0007] Preferably, the spherical seat has a tapered chamfer, and a sealing ring is provided between the tapered chamfer and the outer spherical surface of the ball head to prevent the medium from flowing from the gap between the ball head and the spherical seat to the inlet end. When the valve body is tilted, the tapered chamfer increases the rotation range of the float housing.

[0008] Preferably, the inner wall of the through hole is provided with branch channels in a ring array at equal intervals, and the other end of the branch channel extends to the contact surface between the valve seat and the hollow float, so that when the medium enters the through hole through the inlet end, part of the medium enters the branch channel and applies pressure to the contact surface between the hollow float and the valve seat, so that the hollow float can fall off the valve seat.

[0009] Preferably, the spherical cavity is provided with a through groove that communicates with the outlet end. When the medium enters the spherical cavity from the inlet end through the through hole, it can be discharged from the outlet end through the through groove.

[0010] Preferably, the bottom center of the spherical cavity is provided with an arc-shaped positioning groove for positioning the hollow float. When the hollow float lands on the bottom of the float shell, the arc-shaped positioning groove is attached to the bottom circumferential surface of the hollow float.

[0011] Preferably, a throttling component is provided on the inner wall of the valve body near the outlet end and at the bottom end of the float housing. The throttling component can reduce the flow rate of the medium entering the valve body from the outlet end.

[0012] Preferably, the throttling component includes a throttling disc with a flow channel hole. When the medium enters the valve body through the outlet end, the flow channel hole on the throttling disc reduces the medium flow rate.

[0013] Preferably, the float shell is composed of two paired and spliced ​​first components and second components. The first components and the second components are spliced ​​together by a plug-in structure. The plug-in structure includes a positioning pin on the mating surface of the first component and a positioning groove on the mating surface of the second component that cooperates with the positioning pin.

[0014] Preferably, both the first component and the second component have opposing fixing plates at their bottom ends, and the bottom ends of the first component and the second component are fixed by passing bolts through holes in the fixing plates.

[0015] The beneficial effects of this invention are:

[0016] 1. By using a low-friction universal rotating pair consisting of a spherical seat, balls and ball head, the float housing can automatically adjust and keep the central axis vertical when the valve body is tilted. This ensures that the fluid force on the hollow float always acts perpendicularly on the valve seat sealing surface when the valve is closed in the reverse direction. This solves the problem of poor sealing and leakage caused by tilted installation and improves the reliability and adaptability of the valve's check seal in tilted environments.

[0017] 2. The sealing surface area of ​​the outlet guide valve seat in the branch channel: when the valve needs to be opened from the closed state, part of the medium flowing in the forward direction is guided through these branch channels and acts on the contact surface between the hollow float and the valve seat, generating a downward auxiliary thrust, causing the hollow float to fall off the valve seat, ensuring that the valve can be opened sensitively and reliably even at low flow rate or low pressure, improving the certainty of action and response speed;

[0018] 3. The multi-stage staggered-hole throttling disc significantly consumes the kinetic energy of the reverse medium by extending and tortuous the flow channel, reducing its flow velocity and impact, effectively preventing water hammer and protecting internal components. In addition, the split plug-in design of the float shell and the detachable mounting base structure greatly facilitate the assembly, maintenance and replacement of internal components. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0020] Figure 1 This is an internal sectional view and partial enlarged view of the valve body during forward drainage of the present invention;

[0021] Figure 2 This is an internal cross-sectional view of the valve body during reverse flow of the present invention;

[0022] Figure 3 This is a diagram showing the state of the float housing when the valve body of the present invention is tilted and in the reverse flow state.

[0023] Figure 4 This is an enlarged sectional view of the mounting base and ball head positions of the present invention;

[0024] Figure 5 This is an exploded perspective view of the float shell of the present invention;

[0025] Figure 6 This is a three-dimensional structural diagram of the throttling component of the present invention;

[0026] Figure 7 This is a mechanical diagram showing the force direction of the hollow float ball of the present invention relative to the central axis of the valve seat.

[0027] Figure 8This is a structural diagram of the float shell and spherical positioning groove in Embodiment 2 of the present invention;

[0028] Figure 9 This is a structural diagram showing the state of the float and the direction of the force when the valve body is tilted in the prior art;

[0029] Legend:

[0030] 1. Valve body; 101. Inlet end; 102. Outlet end; 103. Support ring; 2. Mounting base; 201. Mounting flange; 3. Float housing; 031. First assembly; 032. Second assembly; 301. Valve seat; 302. Spherical cavity; 3021. Through groove; 3022. Arc-shaped positioning groove; 3023. Spherical positioning groove; 3024. Liquid cavity; 3025. Micro-through hole; 303. Ball head; 3031. Through... 3032, branch channel; 4, hollow float; 5, spherical seat; 501, ball bearing; 502, sealing ring; 503, tapered chamfer; 6, throttling component; 601, throttling disc; 602, flow channel hole; 7, fixing plate; 8, load-bearing component; 801, outer shell; 802, mounting cavity; 803, load-bearing block; 9, plug-in structure; 901, locating pin; 902, locating groove; a, direction of force; b, central axis. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Specific implementation examples are given below.

[0033] Please see Figures 1-8 The present invention discloses a float-type check valve, comprising a valve body 1, the valve body 1 including an inlet end 101 and an outlet end 102, a float housing 3 being assembled inside the valve body 1 via a mounting seat 2, the top opening of the mounting seat 2 communicating with the inlet end 101, the float housing 3 being rotatably assembled with the mounting seat 2 via a spherical seat 5 on the mounting seat 2, the two ends of the float housing 3 communicating with the inlet end 101 and the outlet end 102 respectively, a hollow float 4 being assembled in the lower part of the float housing 3 via a provided spherical cavity 302, and a valve seat portion 301 being formed in the upper part of the float housing 3 to cooperate with the hollow float 4 to block the outlet end 102 and the inlet end 101; when the valve body 1 is tilted, the float housing 3 can rotate relative to the valve body 1 via the spherical seat 5, and the central axis of the float housing 3 is perpendicular to the horizontal line;

[0034] The mounting base 2 is provided with a mounting flange 201, and the inner wall of the valve body 1 is provided with a support ring 103 that cooperates with the mounting flange 201. When the mounting base 2 is installed in the valve body 1, the support ring 103 holds the mounting flange 201, and the mounting base 2 is installed in the valve body 1 by passing through the two with fixing bolts.

[0035] The spherical seat 5 is detachably assembled with the mounting base 2 by screws. The float shell 3 includes a ball head 303 rotatably assembled with the spherical seat 5. A plurality of balls 501 for the universal rotation of the ball head 303 are rotatably assembled on the spherical inner wall of the spherical seat 5 opposite to the outer spherical surface of the ball head 303. A through hole 3031 is opened in the ball head 303 so that the inlet end 101 communicates with the spherical cavity 302.

[0036] The spherical cavity 302 is provided with a through groove 3021 that communicates with the outlet end 102. When the medium enters the spherical cavity 302 from the inlet end 101 through the through hole 3031, it can be discharged from the outlet end 102 through the through groove 3021.

[0037] During operation, the valve body 1 serves as the main body, with standard pipe connection interfaces at its inlet end 101 and outlet end 102 for connection to external piping systems. The mounting base 2 aligns with the support ring 103 on the inner wall of the valve body 1 via its mounting flange 201 and is secured with fixing bolts, achieving a detachable overall fixation of the internal components. The ball head 303 at the top of the float housing 3 and the detachable spherical seat 5 form a low-friction universal rotation connection through multiple balls 501. During forward flow discharge, the medium enters from the inlet end 101, flows through the opening at the top of the mounting base 2, and passes through the ball head 303. The through-hole 3031 enters the spherical cavity 302 at the lower part of the float housing 3. At this time, the hollow float 4 is located at the bottom of the spherical cavity 302 under the action of gravity and does not contact the valve seat 301. The medium then flows smoothly to the outlet end 102 through the through groove 3021. When reverse flow occurs, the medium enters the valve body 1 from the outlet end 102 in reverse, pushing the hollow float 4 to float up until it is tightly attached to the valve seat 301, closing the through-hole 3031, thereby blocking the backflow of the medium from the outlet end 102 to the inlet end 101. When the valve body 1 is tilted due to the installation foundation, the float housing 3 is under its own weight. Under the action of force, the ball head 303 rotates omnidirectionally within the spherical seat 5, automatically adjusting its central axis to be perpendicular to the horizontal line. This ensures that when reverse flow occurs, the upward force a exerted by the reverse fluid medium on the hollow float 4 is always parallel to and perpendicular to the central axis b of the valve seat 301, acting on the sealing surface of the valve seat 301. This results in a uniform and tight fit between the hollow float 4 and the valve seat 301, effectively preventing the force direction a of the hollow float 4 from shifting from the central axis b of the valve seat 301 due to the tilting of the valve body 1, which would otherwise cause friction between the sealing surfaces. The design and coordination of the above structures facilitate the maintenance and replacement of internal components through the detachable installation of the mounting base 2. The low-friction universal joint formed by the ball bearing 501 and the spherical seat 5 enables the float housing 3 to have an automatic sag adjustment function, ensuring that the buoyancy sealing direction of the hollow float 4 inside the valve body 1 remains optimal under tilted or unstable operating conditions. This improves the reliability and adaptability of the check seal in complex installation environments. By ensuring that the force applied when the fluid flows in reverse and closes is aligned with the axis of the sealing surface, the tightness and reliability of the seal are improved.

[0038] Furthermore, a tapered chamfer 503 is provided on the spherical seat 5. A sealing ring 502 is provided between the tapered chamfer 503 and the outer spherical surface of the ball head 303 to prevent the medium from flowing from the gap between the ball head 303 and the spherical seat 5 to the inlet end 101. When the valve body 1 is tilted, the tapered chamfer 503 increases the rotatable range of the float housing 3. During operation, a tapered chamfer 503 with a tapered flared structure is provided between the contact area of ​​the spherical seat 5 and the ball head 303. In this chamfered area, a sealing ring 502 is embedded between the outer spherical surface of the ball head 303 and the inner wall of the tapered chamfer 503. An adhesive is applied between the embedded groove and the sealing ring 502. The sealing ring 502 is compressed and filled in the gap, effectively preventing the medium from flowing from the float. The internal structure of the housing 3 leaks outward to the inlet end 101 cavity through the rotation gap; at the same time, the design of the conical chamfer 503 provides a larger clearance space for the swing of the ball head 303 in terms of mechanical structure. When the valve body 1 is tilted, causing the float housing 3 to swing and adjust its verticality significantly, the upper part of the ball head 303 can deflect at a larger angle without structural interference with the spherical seat 5. Meanwhile, the conical chamfer 503 limits the swing range of the float housing 3 so that it will not contact the inner wall of the valve body 1. The setting of the sealing ring 502 ensures the static and dynamic sealing performance of the rotating connection, ensuring the working efficiency and sealing reliability of the valve. At the same time, the conical chamfer 503 expands the effective swing angle of the float housing 3, improves the valve's adaptability to larger tilt installation angles, and enhances the application flexibility of the product.

[0039] Furthermore, the inner wall of the through hole 3031 is provided with branch channels 3032 arranged in a ring array at equal intervals. The other end of the branch channels 3032 extends to the contact surface between the valve seat 301 and the hollow float 4, so that when the medium enters the through hole 3031 through the inlet end 101, a portion of the medium enters the branch channels 3032 and applies pressure to the contact surface between the hollow float 4 and the valve seat 301, facilitating the hollow float 4 to detach from the valve seat 301. During operation, when the fluid medium flows in the reverse direction from the outlet end 102 into the valve body 1 for a long time, the hollow float 4 is in contact with the valve seat 301 for a long time. When the adhesion force generated by the adsorption between the hollow float 4 and the valve seat 301 or the accumulated particles prevent the hollow float 4 from falling under its own weight, the above structure is evenly distributed circumferentially on the inner wall of the main through hole 3031 of the ball head 303. Multiple branch channels 3032 are arranged, which start from the through hole 3031 and lead to the sealing surface area of ​​the valve seat 301 below. When the medium flows through the through hole 3031, a part of the medium will be diverted into these branch channels 3032 and guided to the contact surface area between the hollow float 4 and the valve seat 301. This diverted medium generates a downward pressure at the contact surface, which helps to break the adhesion force between the hollow float 4 and the valve seat 301 that may be caused by the characteristics of the medium, such as viscosity or adsorption after standing. The branch channels 3032 provide an active thrust assistance, which effectively solves the problem that the hollow float 4 may not be able to open in time due to adsorption force when the valve is started at low pressure. This ensures that the valve can respond sensitively and reliably to the forward flow, reduce the opening pressure, and improve the certainty and rapid response of the valve action.

[0040] Furthermore, the bottom center of the spherical cavity 302 is provided with an arc-shaped positioning groove 3022 for positioning the hollow float 4. When the hollow float 4 falls to the bottom of the float housing 3, the arc-shaped positioning groove 3022 is attached to the bottom circumferential surface of the hollow float 4. During operation, when the valve is fully open or the medium flow rate is high, the hollow float 4 is pushed to the bottom position away from the valve seat 301. At this time, the bottom of the hollow float 4 will naturally fall into and fit into the arc-shaped positioning groove 3022 for positioning. The arc-shaped positioning groove 3022 plays a role in center positioning and posture stability for the hollow float 4 falling to the bottom. It can prevent the hollow float 4 from rolling and moving randomly at the bottom of the spherical cavity 302, prevent abnormal aging caused by excessive friction of the hollow float 4, and improve its service life.

[0041] Example 2: Replace the arc-shaped positioning groove 3022 with the spherical positioning groove 3023. Please refer to [link / reference]. Figure 8Furthermore, the bottom center of the spherical cavity 302 is provided with a spherical positioning groove 3023 for positioning the hollow float 4. When the hollow float 4 rolls into the spherical positioning groove 3023, the inner wall of the opening end of the spherical positioning groove 3023 is in contact with the outer spherical surface of the hollow float 4. A liquid cavity 3024 is formed between the hollow float 4 and the spherical positioning groove 3023. A micro-through hole 3025 is opened at the bottom end of the liquid cavity 3024. When the hollow float 4 falls into the spherical positioning groove 3023 at the bottom of the float shell 3, a negative pressure is formed in the liquid cavity 3024, which adsorbs the hollow float 4 into the spherical positioning groove 3023. The diameter of the micro-hole 3025 is set between 0.3mm and 1mm. During operation, when the valve is opened and the medium flows in the forward direction, the hollow float 4 is pushed towards the bottom of the spherical cavity 302 and falls into the spherical positioning groove 3023. Since the contour of the spherical positioning groove 3023 is in contact with the outer spherical surface of the hollow float 4, When the two are combined, a relatively sealed liquid cavity 3024 is formed. At this moment, the liquid in the liquid cavity 3024 can only be slowly discharged outward through the micro-hole 3025 at the bottom when the hollow float 4 is pressed in. This discharge process will generate a local negative pressure vacuum effect in the liquid cavity 3024, thereby applying an additional adsorption force to the hollow float 4, making it more stably held in the spherical positioning groove 3023. The diameter of the micro-hole 3025 is controlled between 0.3mm and 1mm to ensure that the negative pressure is moderately formed, providing sufficient adsorption stability, and allowing the medium to pass through or the pressure to balance when the float needs to float in reverse flow, without affecting its normal opening and closing. Through the cooperation of the spherical positioning groove 3023 and the micro-hole 3025, an adsorption force is generated when the hollow float 4 is in place. Even when there is no drainage or backflow, the hollow float 4 can be positioned at the bottom without moving, reducing the wear or noise caused by unnecessary collision and friction between the hollow float 4 and the spherical cavity 302.

[0042] Furthermore, a throttling component 6 is provided on the inner wall of the valve body 1 near the outlet end 102 and at the bottom of the float housing 3. The throttling component 6 can reduce the flow velocity of the medium entering the valve body 1 from the outlet end 102. The throttling component 6 includes a throttling disc 601, on which flow channel holes 602 are opened. When the medium enters the valve body 1 through the outlet end 102, the flow channel holes 602 on the throttling disc 601 reduce the medium flow velocity. At least three throttling discs 601 are provided, and the flow channel holes 602 on each throttling disc 601 are distributed in different positions, so as to increase the medium flow path through the throttling discs 601 and the flow trajectory is meandering. During operation, in the valve body 1 cavity inside the outlet end 102, the throttling component 6 installed in the downstream direction of the float housing 3 consists of at least three parallel throttling discs 601 stacked at intervals. The components are arranged such that the axial positions of the flow channel holes 602 on each throttling disc 601 are staggered and not on a straight line. When reverse flow occurs, and the medium attempts to flow back into the valve body 1 from the outlet end 102, it must pass through the flow channel holes 602 on these multiple throttling discs 601 in sequence. Due to the staggered hole positions, the medium flow needs to change direction when passing through each stage of throttling disc 601, and the flow path is significantly lengthened and becomes tortuous. Through the design and coordination of the above structure, the multi-stage staggered hole throttling component 6 produces a significant throttling and damping effect on the reverse-flowing medium by lengthening and torturing the flow channel, effectively consuming its kinetic energy, greatly reducing its flow velocity and impact energy, and avoiding the direct and violent impact of high-speed backflow on the float shell 3 or hollow float 4, which could lead to sealing failure, component damage, or severe water hammer. This improves the stability and lifespan of the valve in preventing water hammer and reverse sealing.

[0043] Furthermore, the central axes of the float housing 3 and the throttling disc 601 are aligned. The flow channel holes 602 on the throttling disc 601 closest to the float housing 3 are located at the peripheral edge of the throttling disc 601, so that the medium does not directly impact the float housing 3 when it comes into contact with it. During operation, all throttling discs 601 are coaxially mounted with the float housing 3. The throttling disc 601 closest to the bottom of the float housing 3 has its flow channel holes 602 located at the outer peripheral edge of the disc surface, rather than in the central area. This structure ensures that when the reverse medium, after being slowed down by the previous stages, flows out from the final stage throttling disc 601, its main flow direction is towards the circumference of the inner wall of the valve body 1, rather than directly aligned with the bottom of the float housing 3 on the axis. It guides the flow of the slowed reverse medium to the side, allowing it to flow along the inner wall of the valve body 1, thereby avoiding the direct impact of residual kinetic energy on the bottom of the float housing 3. This further protects the float housing 3 and its internal hollow float 4 from impact vibration, and further ensures the sealing performance during backflow.

[0044] Furthermore, the float shell 3 is composed of two paired components, a first component 031 and a second component 032, which are spliced ​​together by a plug-in structure 9. The plug-in structure 9 includes a positioning pin 901 on the mating surface of the first component 031 and a positioning groove 902 on the mating surface of the second component 032 that cooperates with the positioning pin 901. During operation, the float shell 3 is manufactured in a split manner, consisting of two symmetrical and complementary half-shells, the first component 031 and the second component 032, spliced ​​along the central axis plane. During assembly, the positioning pin 901 of the first component 031 is inserted into the positioning groove 902 of the second component 032 to achieve precise positioning and alignment of the two components. When docking, sealant is applied to the mating surfaces of the two components to prevent fluid leakage from the gaps. Through the design and coordination of the above structure, the split structure simplifies the manufacturing process of the float shell 3, reduces the processing difficulty, and also facilitates subsequent assembly and maintenance.

[0045] Furthermore, both the first component 031 and the second component 032 have opposing fixing plates 7 at their bottom ends. The bottom ends of the first component 031 and the second component 032 are fixed by passing bolts through the holes on the fixing plates 7. During operation, the bottom outer sides of the first component 031 and the second component 032 are respectively designed with outward extending fixing plates 7. After the first component 031 and the second component 032 are initially connected by the plug-in structure 9, their bottom fixing plates 7 will fit together. By passing bolts through the pre-aligned holes on these fixing plates 7 and tightening them, a fastening force can be applied from the bottom to firmly lock the two components together.

[0046] Furthermore, a load-bearing component 8 is provided at the bottom of the float housing 3. The load-bearing component 8 includes two outer shells 801 located opposite each other at the bottom of the first component 031 and the second component 032. Each of the two outer shells 801 has an installation cavity 802 on its opposite surface, and a load-bearing block 803 is assembled in the installation cavity 802. During operation, the load-bearing component 8 adopts a split structure, which is formed by the two outer shells 801 belonging to the first component 031 and the second component 032 respectively. When the first component 031 and the second component 032 are spliced ​​together, the load-bearing block 803 inside is also fixed at the same time. The load-bearing component 8 provides a stable additional counterweight for the float housing 3, which helps to lower the center of gravity of the entire float housing 3 and increase its overall mass rotational inertia. When the valve body 1 is tilted, the heavier float housing 3 with a lower center of gravity has a more stable vertical adjustment action, stronger resistance to flow disturbance, and can more reliably maintain a vertical posture, thereby indirectly ensuring the effectiveness of the gravity seal of the hollow float 4.

[0047] Furthermore, the load-bearing component 8 is aligned with the center axis of gravity of the float shell 3. During operation, the load-bearing component 8 is symmetrically installed at the center of the bottom of the float shell 3 to ensure that its own mass distribution is symmetrical about the center axis of the float shell 3. This ensures that the center of gravity of the load-bearing component 8 coincides with the rotation axis of the float shell 3, avoiding additional unbalanced torque caused by the eccentricity of the counterweight. This prevents the float shell 3 from deflecting due to uneven mass distribution when it is rotated and adjusted by the spherical seat 5.

[0048] Furthermore, the surface of the hollow float 4 is covered with a rubber sealing layer to increase the sealing performance when the hollow float 4 contacts the valve seat 301. During operation, an elastic rubber sealing layer is integrally wrapped or vulcanized and adhered to the outer surface of the metal hollow float 4. When reverse flow occurs, the hollow float 4 is pushed upward by the medium and comes into contact with the valve seat 301. Under the action of contact pressure, the rubber sealing layer undergoes elastic deformation. This deformation can effectively fill the microscopic uneven gaps that may exist between the surface of the hollow float 4 and the sealing surface of the valve seat 301, and fit tightly against the sealing contour of the valve seat 301, improving the contact sealing effect and effectively blocking minor leakage. The selection of rubber materials such as nitrile rubber and fluororubber can be adapted to media with different properties such as oil, water, and corrosive fluids, enhancing the valve's media adaptability and sealing reliability.

[0049] Furthermore, the inner wall contour of the valve seat 301 is set as an arc surface that matches the outer wall of the hollow float 4. During operation, the sealing surface of the valve seat 301 that contacts the hollow float 4 is machined into a concave arc surface that matches the curvature of the outer spherical surface of the hollow float 4. When the hollow float 4 floats up and closes, the rubber sealing layer on its surface forms a large-area, conformal surface contact with the concave arc surface of the valve seat 301, maximizing the sealing contact area. This ball-and-socket fit has a self-guiding effect on the closing position of the hollow float 4, ensuring the stability of the closing action and the centering of the sealing surface, further improving the stability and consistency of the seal.

[0050] Furthermore, the transition surface between the spherical cavity 302 and the valve seat 301 is an arc surface; during operation, it eliminates sharp angles or right-angle steps, firstly providing a smooth flow path for the medium. When the medium enters from the through hole 3031 and flows to the outlet end 102, it can reduce eddies and local resistance, which helps to reduce the flow resistance coefficient of the valve and improve the flow capacity. Secondly, during the up-and-down movement of the hollow float 4, the smooth arc surface transition avoids interference or jamming on its movement trajectory and prevents the steps from hitting the hollow float 4 hard, thus improving the reliability of operation.

[0051] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," 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 invention. In this specification, 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.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A float-type check valve, comprising a valve body (1), the valve body (1) including an inlet end (101) and an outlet end (102), characterized in that: The valve body (1) is fitted with a float housing (3) via a mounting seat (2). The top opening of the mounting seat (2) is connected to the inlet end (101). The float housing (3) is rotatably fitted to the mounting seat (2) via a spherical seat (5) on the mounting seat (2). The two ends of the float housing (3) are connected to the inlet end (101) and the outlet end (102) respectively. The lower part of the float housing (3) is fitted with a hollow float (4) via a spherical cavity (302). The upper part of the float housing (3) is formed with a valve seat (301) that cooperates with the hollow float (4) to block the outlet end (102) and the inlet end (101). When the valve body (1) is tilted, the float housing (3) can rotate relative to the valve body (1) via the spherical seat (5), and the central axis of the float housing (3) is perpendicular to the horizontal line. The spherical seat (5) is detachably assembled with the mounting base (2) by screws. The float shell (3) includes a ball head (303) rotatably assembled with the spherical seat (5). Several balls (501) for universal rotation of the ball head (303) are rotatably assembled on the spherical inner wall of the spherical seat (5) opposite to the outer spherical surface of the ball head (303). A through hole (3031) is opened in the ball head (303) to communicate with the inlet end (101) and the spherical cavity (302). The spherical cavity (302) is provided with a through groove (3021) that communicates with the outlet end (102). When the medium enters the spherical cavity (302) from the inlet end (101) through the through hole (3031), it can be discharged from the outlet end (102) through the through groove (3021).

2. The float-type check valve according to claim 1, characterized in that: A tapered chamfer (503) is provided on the spherical seat (5). A sealing ring (502) is provided between the tapered chamfer (503) and the outer spherical surface of the ball head (303) to prevent the medium from flowing from the gap between the ball head (303) and the spherical seat (5) to the inlet end (101). When the valve body (1) is tilted, the tapered chamfer (503) increases the rotatable range of the float housing (3).

3. A float-type check valve according to claim 1, characterized in that: The inner wall of the through hole (3031) is provided with branch channels (3032) in a ring array at equal intervals. The other end of the branch channel (3032) extends to the contact surface between the valve seat (301) and the hollow float (4), so that when the medium enters the through hole (3031) through the inlet end (101), a part of the medium enters the branch channel (3032) and applies pressure to the contact surface between the hollow float (4) and the valve seat (301), so that the hollow float (4) can fall off the valve seat (301).

4. A float-type check valve according to claim 1, characterized in that: The bottom center of the spherical cavity (302) is provided with an arc-shaped positioning groove (3022) for positioning the hollow float (4). When the hollow float (4) falls on the bottom of the float shell (3), the arc-shaped positioning groove (3022) is attached to the bottom circumferential surface of the hollow float (4).

5. A float-type check valve according to claim 1, characterized in that: A throttling component (6) is provided on the inner wall of the valve body (1) near the outlet end (102) and at the bottom of the float housing (3). The throttling component (6) can reduce the flow rate of the medium entering the valve body (1) from the outlet end (102).

6. A float-type check valve according to claim 5, characterized in that: The throttling component (6) includes a throttling disc (601) with a flow channel hole (602) on it. When the medium enters the valve body (1) through the outlet end (102), the flow channel hole (602) on the throttling disc (601) reduces the medium flow rate.

7. A float-type check valve according to claim 1, characterized in that: The float shell (3) is composed of two paired components (031) and a second component (032). The first component (031) and the second component (032) are spliced ​​together by a plug-in structure (9). The plug-in structure (9) includes a positioning pin (901) on the mating surface of the first component (031) and a positioning groove (902) on the mating surface of the second component (032) that cooperates with the positioning pin (901).

8. A float-type check valve according to claim 1, characterized in that: The bottom center of the spherical cavity (302) is provided with a spherical positioning groove (3023) for positioning the hollow float (4). The inner wall of the opening end of the spherical positioning groove (3023) is adapted to fit the outer spherical surface of the hollow float (4), and a liquid cavity (3024) is formed between the two. A micro-hole (3025) is provided at the bottom end of the liquid cavity (3024). The liquid cavity (3024) forms a negative pressure through the micro-hole (3025) to adsorb the hollow float (4).

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