Quick maintenance butterfly check valve
By using a dual-valve shaft with a limit-position integrated embedded butterfly plate assembly and a sealing ring structure, the problem of easy detachment of the butterfly check valve's sealing ring and the inability to perform on-site maintenance is solved, enabling rapid replacement and efficient sealing, and reducing maintenance costs and leakage risks.
Patent Information
- Application Number
- CN202511756612.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-27
- Publication Date
- 2026-01-27
AI Technical Summary
The rubber seals of existing butterfly check valves are prone to falling off, leading to leakage risks. They cannot be repaired on-site and need to be returned to the factory for vulcanization, which is costly and time-consuming.
It adopts a dual-valve shaft integral embedded butterfly plate assembly with limit and a sealing ring with a support ring. The sealing ring is a single raised structure with double dovetail anti-erosion tenon groove vulcanization, which is fixed by pressure ring. The butterfly plate and valve shaft are designed with axial clearance to achieve quick replacement and reliable sealing.
When the sealing ring is damaged, it can be quickly replaced on site to prevent it from falling off and being washed away, reducing maintenance costs and time, ensuring that the valve body is leak-free, and making the sealing performance more reliable under high pressure.
Smart Images
Figure CN121408484A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of check valve technology. Background Technology
[0002] Currently used butterfly check valves have rubber seals that are integrally vulcanized onto the valve body. This requires periodically transporting the entire valve back to the manufacturer for re-vulcanization, making on-site maintenance impossible. When the butterfly check valve is located at the pump outlet, the impact force of the medium is significant, and the outer end face of the rubber seal is easily eroded and impacted by the medium, causing the seal to detach and posing a leakage risk. Summary of the Invention
[0003] To address the shortcomings of existing technologies, this invention provides a quick-repair butterfly check valve, comprising a valve body, a double valve shaft integral embedded butterfly plate assembly with limiting function installed in the valve shaft seat hole of the valve body, and a sealing ring with a support ring installed between the butterfly plate assembly and the valve body channel. The sealing ring is a single raised structure with double dovetail anti-erosion tenon groove vulcanization, and the sealing ring is fixed by a pressure ring.
[0004] Preferably, the dual-valve shaft integrated embedded butterfly plate assembly with limiter includes a butterfly plate, a spring, a bushing, a valve shaft, and a valve shaft seat.
[0005] Preferably, the pressure ring has a stop.
[0006] Preferably, the butterfly plate and the valve shaft are designed with axial clearance. Beneficial effects
[0007] The individual sealing ring component allows for easy replacement of only the sealing ring component if it is damaged. The single raised sealing ring structure with double dovetail anti-erosion tenon groove vulcanization features anti-loosening and anti-erosion functions. The dual valve shaft with limit integrated embedded butterfly plate assembly structure features no through hole in the valve body, enabling quick replacement of the butterfly plate assembly and eliminating the risk of valve body leakage. The pressure ring adopts a stop design, and the pressure ring above the stop is misaligned by the bolt preload, providing good anti-loosening effect. The butterfly plate and valve shaft are designed with axial clearance. Under low pressure, the spring preload provides reliable sealing, and under high pressure, the butterfly plate can float freely within the axial clearance. The higher the pressure, the more reliable the medium force seal. Attached Figure Description
[0008] Figure 1 This is a structural diagram of the present invention; Figure 2 This is a side view of the present invention; Figure 3 for Figure 2 Enlarged view of part I.
[0009] In the diagram: 1. Valve body; 2. Butterfly plate; 3. Valve shaft; 4. Spring; 5. Valve shaft seat; 6. Bushing; 7. Pressure block; 8. Sealing ring; 801. Support ring; 802. Double dovetail anti-erosion tenon groove vulcanized single raised sealing ring; 9. Pressure ring. Detailed Implementation
[0010] 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.
[0011] See Figure 1-3 A quick-repair butterfly check valve, wherein the butterfly plate, spring and bushing are installed on the valve shaft in sequence, and valve shaft seats are installed at both ends of the valve shaft. The above constitutes a double valve shaft with limit integral embedded butterfly plate assembly structure, which is installed in the valve shaft seat hole of the valve body and fixed by pressure blocks.
[0012] The sealing ring consists of a support ring and a single raised sealing ring with double dovetail anti-erosion tenon groove vulcanization, which prevents the sealing ring from falling off and erosion. The sealing ring is installed as a whole into the valve body channel and contacts the butterfly plate assembly plane. Once the rubber sealing ring is damaged, only the sealing ring needs to be replaced on site, without having to be sent back to the manufacturer. The replacement can be completed within 1 hour, which is much faster than sending it back to the factory for repair, which takes at least 1 month, saving time and costs.
[0013] The sealing ring is fixed by a pressure ring. The pressure ring has a stop in the radial direction and several threaded holes in the axial direction. The pressure ring is misaligned above the stop by the pre-tightening force of the bolt, which plays a good role in preventing loosening.
[0014] The butterfly valve shaft hole and valve shaft are designed with axial clearance. Under low pressure, the spring preload provides reliable sealing, while under high pressure, the butterfly plate can float freely within the axial clearance. The higher the pressure, the more reliable the medium force seal.
[0015] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.
Claims
1. A quick-repair butterfly check valve, comprising a valve body, characterized in that, The valve body has a double valve shaft with a limit integral embedded butterfly plate assembly installed in the valve shaft seat hole. A sealing ring with a support ring is installed between the butterfly plate assembly and the valve body channel. The sealing ring is a single raised structure with double dovetail anti-erosion tenon groove vulcanization. The sealing ring is fixed by a pressure ring.
2. The quick-repair butterfly check valve according to claim 1, characterized in that, The dual-valve shaft integrated embedded butterfly plate assembly with limiter includes a butterfly plate, a spring, a bushing, a valve shaft, and a valve shaft seat.
3. The quick-repair butterfly check valve according to claim 1, characterized in that, The pressure ring is provided with a stop.
4. The quick-repair butterfly check valve according to claim 1, characterized in that, The butterfly plate and valve shaft are designed with an axial clearance.