Check valve of bottom valve
By using a valve body shell made of CPVC plastic and a bottom valve check valve with a frustum-shaped filter structure, the problem of poor durability of existing check valve materials is solved, achieving low-cost, corrosion-resistant, and well-sealing fluid control.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YUHUAN DR COPPER VALVE
- Filing Date
- 2025-05-23
- Publication Date
- 2026-05-05
AI Technical Summary
Existing check valves made of copper or plastic suffer from high cost and poor durability. They are particularly prone to deformation or corrosion under high pressure and high temperature environments, which affects sealing performance and service life.
The valve body shell is made of CPVC plastic, combined with a valve core, retaining ring and elastic element for water-stopping structure. The valve core has a reinforcing rib at the top, the filter element adopts a frustum-shaped filter screen structure, and the sealing ring is used for buffering and isolation to ensure unidirectional fluid flow and filtration efficiency.
It achieves low-cost, corrosion-resistant, durable, and well-sealed fluid control, extending the service life of the equipment and reducing maintenance costs and energy consumption.
Smart Images
Figure CN224201186U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of check valve technology, and more specifically, to a bottom valve check valve. Background Technology
[0002] Whether in industrial production fields such as chemicals, petroleum, and power, or in daily water supply and drainage systems, it is essential to ensure that fluids flow in a specific direction to prevent backflow. Backflow can lead to a series of problems, including equipment damage, process disruption, and energy waste. For example, in a water pump system, backflow can reduce pump efficiency and may even damage the pump blades; in chemical pipelines, backflow can cause different chemicals to mix, triggering dangerous reactions. Therefore, check valves, as important fluid control devices, play an indispensable role in fluid transport systems.
[0003] Traditionally, both domestic and international check valve manufacturing processes have used copper or plastic bodies. On one hand, copper is a relatively expensive metal, increasing product costs. Furthermore, with the gradual depletion of global copper resources and significant price fluctuations, the production and sales of check valves are subject to uncertainty. On the other hand, plastics have relatively low mechanical strength, making them prone to deformation and even cracking under harsh conditions such as high pressure and high temperature, limiting their application range. Moreover, plastics have poor aging resistance; prolonged exposure to sunlight or high temperatures and humidity can degrade their properties, affecting the sealing performance and lifespan of the check valve. Utility Model Content
[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a safe, reliable, and well-sealed bottom valve check valve.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a bottom valve check valve, comprising a valve body, wherein the valve body is provided with a liquid flow channel, the channel is provided with a valve core and a water-stopping structure adapted to the valve core, the inlet end of the valve body is provided with a threaded filter element, and the outlet end of the valve body is provided with an internal thread for connection to an external connector, the water-stopping structure includes a retaining ring disposed in the channel and adapted to the top of the valve core, a clip sleeved on the bottom end of the valve core, and an elastic element disposed between the retaining ring and the clip, the water-stopping structure is configured such that when the water pump stops working, the elastic force generated by the deformation of the elastic element when the water pump is working causes the valve core to move in the axial direction and abut against the retaining ring, ensuring unidirectional fluid flow.
[0006] The present invention is further configured such that: a plurality of reinforcing ribs are evenly provided at the top of the valve core, and the reinforcing ribs are also used to limit the valve core from contacting the retaining ring in the channel.
[0007] The present invention is further configured such that: the filter element adopts a frustum-shaped filter structure, the bottom diameter of the filter element is 0.8 to 0.96 times the top diameter, and the bottom diameter of the filter element is 0.7 to 1.2 times the height.
[0008] The present invention is further configured such that the height of the filter screen opening of the filter element is 0.5 to 0.8 times the distance between adjacent filter screen openings.
[0009] The present invention is further configured such that the valve body shell is made of CPVC plastic material.
[0010] The present invention is further configured such that a sealing ring is fitted between the top of the valve core and the retaining ring.
[0011] The beneficial effects of this utility model are:
[0012] 1. The overall structure of the foot valve check valve is relatively simple, mainly composed of a few components such as the valve body, valve core, water-stop structure, and filter element. This simple structure not only reduces manufacturing difficulty and cost but also makes later maintenance and repair more convenient. The threaded filter element at the valve body inlet effectively filters the liquid entering the foot valve check valve, preventing impurities from entering the system and potentially causing wear and blockage to the pump, pipelines, and other related equipment, severely affecting the normal operation and service life of the equipment. The internal thread at the valve body outlet allows for easy connection to external connectors. In different fluid transport systems, it is necessary to adapt to various specifications and types of external connectors. The water-stop structure consists of a retaining ring, a clamp, and an elastic element that work together to effectively ensure unidirectional fluid flow. When the pump is working normally, the liquid pressure causes the valve core to overcome the elastic force of the elastic element and move, thereby opening the passage and allowing the liquid to pass smoothly. When the water pump stops working, the elastic force generated by the elastic element during the previous deformation will cause the valve core to move axially and come into contact with the retaining ring, sealing the passage and preventing liquid backflow.
[0013] 2. Several reinforcing ribs evenly distributed at the top of the valve core greatly enhance its structural strength. During actual operation, the valve core frequently withstands liquid pressure and impacts with the retaining ring. Without the reinforcement of these ribs, the valve core is prone to deformation or even damage over long-term use. The reinforcing ribs better resist external pressure and impact, extending the valve core's service life and reducing equipment failures and maintenance costs caused by valve core damage. When the pump stops working, the elastic element pushes the valve core to move, and the limiting effect of the reinforcing ribs ensures that the valve core accurately reaches the contact position with the retaining ring, achieving a good sealing effect and effectively preventing liquid backflow. The valve body shell is made of CPVC plastic, which has many significant advantages. CPVC plastic has excellent corrosion resistance and can resist the erosion of various chemicals. In different fluid transportation environments, especially in industrial production scenarios containing corrosive media, the CPVC valve body shell can maintain stable performance for a long time and will not be damaged by corrosion, greatly extending the service life of the foot valve / check valve.
[0014] 3. Compared to traditional flat filters, the frustum-shaped filter structure provides a larger filtration area within a limited space. When liquid flows in from the inlet, more liquid can simultaneously contact the filter for filtration, significantly improving filtration efficiency. Furthermore, it avoids premature clogging of localized areas due to overuse, extending the filter's lifespan. The bottom diameter of the filter element is 0.8 to 0.96 times the top diameter, ensuring a certain taper to achieve a larger filtration area without excessive taper that could lead to structural instability or connection problems with the valve body. This appropriate taper allows for smoother liquid flow through the filter element, reducing flow resistance and energy loss. This size ratio also facilitates the threaded connection between the filter element and the valve inlet, ensuring a tight and stable connection. The bottom diameter of the filter element is 0.7 to 1.2 times its height, ensuring a suitable overall height while maintaining a sufficient filtration area. Excessive height might increase the liquid flow path and resistance; insufficient height might not provide enough filtration space. The appropriate height-to-bottom diameter ratio allows the filter element to achieve efficient filtration within a limited space and is easy to install at the inlet end of the valve body.
[0015] 4. The height of the filter screen openings is 0.5 to 0.8 times the distance between adjacent screen openings, achieving a good balance between filtration efficiency and liquid flow rate. If the screen opening height is too large relative to the spacing, the liquid passage through the screen will widen. Although the flow rate may increase, larger impurities may pass through, reducing the filtration effect. Conversely, if the screen opening height is too small, although more impurities can be intercepted, the resistance to liquid flow through the screen will increase significantly, resulting in a slower flow rate and affecting the overall efficiency of the fluid transport system. The sealing ring acts as a buffer and isolation between the valve core and the retaining ring, reducing wear caused by direct contact between the valve core and the retaining ring. During long-term use, frequent collisions and friction between the valve core and the retaining ring can lead to surface wear, affecting the sealing effect and the service life of the components. The sealing ring can absorb some of the impact force, reducing wear, extending the service life of the valve core and retaining ring, and reducing equipment maintenance costs and downtime. Attached Figure Description
[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0017] Figure 2 This is a cross-sectional view of the present invention;
[0018] Figure 3 This is a three-dimensional structural diagram of the water-stopping structure of this utility model;
[0019] Figure 1-3 Reference numerals in the attached diagram: 1. Valve body; 2. Valve core; 3. Filter element; 4. Snap ring; 5. Clamp; 6. Elastic element; 7. Reinforcing rib; 8. Sealing ring. Detailed Implementation
[0020] Reference Figures 1 to 3 The embodiments of this utility model will be further described below.
[0021] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0022] Moreover, relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.
[0023] Figures 1 to 3 The illustrated bottom valve check valve includes a valve body 1 with a liquid flow channel. The channel houses a valve core 2 and a matching water-stopping structure. This simple structure reduces manufacturing difficulty and cost, and facilitates later maintenance and repair. The inlet end of the valve body 1 is equipped with a threaded filter element 3, which effectively filters the liquid entering the bottom valve check valve, preventing impurities from entering the system and potentially causing wear and blockage to pumps, pipes, and other related equipment, severely impacting their normal operation and lifespan. Furthermore, the outlet end of the valve body 1 has an internal thread for easy connection to external connectors. In different fluid transport systems, various specifications and types of external connectors need to be adapted. The water-stopping structure includes a retaining ring 4 fitted inside the channel and adapted to the top of the valve core 2, a clip 5 fitted at the bottom of the valve core 2, and an elastic element 6 positioned between the retaining ring 4 and the clip 5. This structure effectively ensures unidirectional fluid flow. When the water pump is operating normally, the liquid pressure causes the valve core 2 to overcome the elastic force of the elastic element 6, thus opening the channel and allowing the liquid to pass smoothly. When the water pump stops operating, the elastic force generated by the elastic element 6 during its previous deformation causes the valve core 2 to move axially and abut against the retaining ring 4, sealing the channel and preventing backflow of liquid.
[0024] The valve core 2 is also uniformly provided with several reinforcing ribs 7 at its top, which greatly enhances the structural strength of the valve core 2. During actual operation, the valve core 2 needs to frequently withstand liquid pressure and collisions with the retaining ring 4. Without the reinforcement of the reinforcing ribs 7, the valve core 2 is prone to deformation or even damage during long-term use. The reinforcing ribs 7 can better resist external pressure and impact, extending the service life of the valve core 2 and reducing equipment failures and maintenance costs caused by damage to the valve core 2. When the water pump stops working, the elastic element 6 pushes the valve core 2 to move, and the limiting effect of the reinforcing ribs 7 ensures that the valve core 2 can accurately reach the contact position with the retaining ring 4, achieving a good sealing effect and effectively preventing liquid backflow.
[0025] The filter element 3 adopts a frustum-shaped filter screen structure, which can provide a larger filtration area within a limited space. When liquid flows in from the inlet, more liquid can simultaneously contact the filter screen for filtration, greatly improving filtration efficiency. Moreover, it avoids premature clogging of local filter screens due to overuse, extending the service life of the filter element 3.
[0026] When the bottom diameter of filter element 3 is less than 0.8 times its top diameter, the small bottom diameter causes fluid to flow rapidly through the bottom area, easily leading to turbulence and increased energy loss. Conversely, when the bottom diameter is greater than 0.96 times its top diameter, the close proximity of the two diameters results in insignificant velocity changes within the filter element, hindering proper fluid distribution and potentially preventing some filter media from functioning effectively, thus reducing overall filtration efficiency. Therefore, the optimal bottom diameter for filter element 3 is between 0.8 and 0.96 times its top diameter. This ensures a certain degree of taper for a larger filtration area without excessive taper that could cause structural instability or connection problems with valve body 1. The appropriate taper allows for smoother liquid flow through filter element 3, reducing flow resistance and energy loss. Furthermore, this size ratio facilitates the threaded connection between filter element 3 and the inlet of valve body 1, ensuring a tight and stable connection.
[0027] When the bottom diameter of filter element 3 is less than 0.7 times its height, the small bottom diameter narrows the flow channel within the filter element 3, significantly increasing fluid resistance. To maintain normal flow, higher pressure is required to push the fluid through the filter element 3, increasing energy consumption and placing higher demands on power equipment such as pumps, thus increasing equipment and operating costs. When the bottom diameter of filter element 3 is greater than 1.2 times its height, the excessively large bottom diameter increases the flow space within the filter element 3, slowing the flow velocity and making the fluid prone to eddies, leading to turbulent fluid distribution. Therefore, a bottom diameter of 0.7 to 1.2 times the height of filter element 3 is optimal, ensuring a suitable filtration area while maintaining a moderate overall height. Excessive height may increase the liquid flow path and resistance; insufficient height may prevent adequate filtration space. A suitable height-to-bottom diameter ratio allows filter element 3 to achieve efficient filtration within a limited space and facilitates installation at the inlet end of valve body 1.
[0028] When the height of the filter screen opening of filter element 3 is less than 0.5 times the distance between adjacent filter screen openings, the height is too small. Although it can intercept more impurities, it will significantly increase the resistance of the liquid passing through the filter screen, resulting in a slower flow rate and affecting the working efficiency of the entire fluid transport system. When the height of the filter screen opening of filter element 3 is greater than 0.8 times the distance between adjacent filter screen openings, the height is too large. Some larger impurities may take the opportunity to pass through the filter screen, reducing the filtration effect. It will also make the structure of the filter screen relatively fragile. Under the impact of the fluid, the filter screen is more likely to deform or be damaged. Damage to the filter screen will directly affect the filtration effect and may even require the replacement of the entire filter screen, increasing the operating cost. Therefore, the optimal height of the filter screen opening of filter element 3 is between 0.5 and 0.8 times the distance between adjacent filter screen openings. This achieves a good balance between filtration efficiency and liquid flow rate, allowing the fluid to pass through filter element 3 stably and efficiently, and effectively intercepting impurities.
[0029] The valve body 1 shell is made of CPVC plastic, which has excellent corrosion resistance and can resist the erosion of various chemicals. In different fluid transportation environments, especially in some industrial production scenarios containing corrosive media, the CPVC valve body 1 shell can maintain stable performance for a long time and will not be damaged by corrosion, greatly extending the service life of the foot valve check valve.
[0030] A sealing ring 8 is fitted between the top of the valve core 2 and the retaining ring 4. The sealing ring 8 acts as a buffer and isolation between the valve core 2 and the retaining ring 4, reducing wear caused by direct contact between them. During long-term use, frequent collisions and friction between the valve core 2 and the retaining ring 4 can lead to surface wear, affecting the sealing effect and the service life of the components. The sealing ring 8 can absorb some of the impact force, reduce wear, extend the service life of the valve core 2 and the retaining ring 4, and reduce equipment maintenance costs and downtime.
[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A bottom valve check valve, comprising a valve body (1), characterized in that, The valve body (1) is provided with a liquid flow channel, the channel is provided with a valve core (2) and a water-stopping structure adapted to the valve core (2), the water inlet end of the valve body (1) is provided with a threaded filter element (3), and the water outlet end of the valve body (1) is provided with an internal thread for connection to an external connector. The water-stopping structure includes a retaining ring (4) provided in the channel and adapted to the top of the valve core (2), a clip (5) sleeved on the bottom of the valve core (2), and an elastic element (6) provided between the retaining ring (4) and the clip (5). The water-stopping structure is configured such that when the water pump stops working, the elastic element (6) deforms during the operation of the water pump and the elastic force generated causes the valve core (2) to move in the axial direction and abut against the retaining ring (4), ensuring unidirectional fluid flow.
2. The bottom valve check valve according to claim 1, characterized in that, The valve core (2) is also provided with several reinforcing ribs (7) evenly distributed at its top end. The reinforcing ribs (7) are also used to limit the valve core (2) from contacting the retaining ring (4) in the channel.
3. The bottom valve check valve according to claim 1, characterized in that, The filter element (3) adopts a frustum-shaped filter structure. The bottom diameter of the filter element (3) is 0.8 to 0.96 times the top diameter, and the bottom diameter of the filter element (3) is 0.7 to 1.2 times the height.
4. The bottom valve check valve according to claim 3, characterized in that, The height of the filter screen opening of the filter element (3) is 0.5 to 0.8 times the distance between adjacent filter screen openings.
5. The bottom valve check valve according to claim 1, characterized in that, The outer shell of the valve body (1) is made of CPVC plastic.
6. The bottom valve check valve according to claim 3, characterized in that, A sealing ring (8) is fitted between the top of the valve core (2) and the retaining ring (4).