Ultra-short axial-flow type check valve
By designing an ultra-short axial flow check valve and adopting a sealing structure with straight sections and curved sections, the installation and noise problems of the axial flow check valve in a narrow space are solved, and the smooth passage of the medium and noise reduction are achieved.
Patent Information
- Application Number
- CN202423030931.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-12-10
AI Technical Summary
The existing axial flow check valve cannot be installed when the axial space is narrow and generates huge noise when the medium is backwashed.
An ultra-short axial flow check valve is designed. The valve disc includes a straight section and a curved section. Two sealing surfaces are set in the middle of the valve body and the guide tube. The curved section is convex and curved toward the inlet cavity. The medium swirls and buffers during backwash check. The straight section diverts the medium to reduce the impact force. The spring and gland structure are combined to adjust the valve opening pressure and guidance.
It effectively shortens the axial length of the valve body, alleviates the impact noise of the medium, ensures the normal passage of the medium, adapts to installation in narrow spaces, and reduces recoil noise.
Smart Images
Figure CN223360007U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of valves, in particular to an ultra-short axial flow check valve. Background Art
[0002] Axial flow check valves are primarily used in pipelines where media flow in one direction. They are automatic valves and are widely used at pump outlets for oil, gas, and pipeline networks. The main components of an axial flow check valve are the valve body, disc, stem, and spring. When there is no media pressure upstream, the spring force pushes the disc to move, allowing the disc sealing surface to mate with the valve body sealing surface, forming a seal. Due to mechanical issues with existing axial flow check valves, the valve body itself occupies a relatively large axial space, making them impractical to install and operate in confined axial spaces. Furthermore, shortening the axial length of existing axial flow check valves reduces the media travel, resulting in significant noise from media backflow. Summary of the Invention
[0003] In view of the deficiencies in the prior art, the utility model provides an ultra-short axial flow check valve.
[0004] The technical solutions provided by this utility model are:
[0005] An ultra-short axial flow check valve includes a valve body and a valve disc. A guide cylinder is fixed in the valve body, and the guide cylinder divides the flow channel of the valve body into upper and lower channels. The flow channel includes an inlet cavity and an outlet cavity. A valve stem is passed through the guide cylinder, and one end of the valve stem extends out of the guide cylinder and is connected to the valve disc. A spring is provided between the valve stem and the guide cylinder. The valve disc includes a straight section and a curved section. A first sealing surface that cooperates with one end of the curved section is provided in the middle of the valve body, and the guide cylinder is provided with a second sealing surface that cooperates with the other end of the curved section. The curved section is convex and curved toward the inlet cavity.
[0006] The inner diameter of the inlet cavity gradually decreases from the inlet end to the middle of the valve body.
[0007] The straight section is provided with a connecting plate, and one end of the valve stem is fixed to the middle of the connecting plate through a nut.
[0008] The end of the valve stem arranged in the guide cylinder is provided with a spring seat, and the guide cylinder is provided with a pressure cover. One end of the spring presses against the spring seat, and the other end presses against the pressure cover.
[0009] The gland is provided with a guide portion along the circumference of the outer side of the valve stem.
[0010] The pressure cover is provided with a plurality of step surfaces corresponding to the spring.
[0011] A lifting ring is provided on the valve body.
[0012] The beneficial effects of the present invention are as follows: the present invention designs a new valve disc, which includes a straight section and a curved section. Two sealing surfaces cooperating with the curved section are arranged in the middle part of the valve body and the guide tube. The curved section is convex and curved toward the inlet cavity, and the straight section cooperates with the valve stem to move laterally, thereby effectively shortening the axial length of the valve body. When the medium is in a backwash check, the medium can swirl at the curved structure, and the straight section can also divert the recoil medium. The two sealing contact surfaces simultaneously alleviate the impact force generated by the impact of the medium, thereby avoiding severe recoil noise. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of an embodiment of the present utility model. DETAILED DESCRIPTION
[0014] The embodiments of the present invention will be further described below with reference to the accompanying drawings.
[0015] like Figure 1 As shown, an ultra-short axial flow check valve includes a valve body 1, a valve disc 8, and a guide tube 2. The guide tube 2 is hollow and fixed in the valve body by welding. The guide tube 2 divides the flow channel of the valve body into upper and lower channels. The flow channel includes an inlet cavity 11 and an outlet cavity 12. The guide tube 2 is penetrated by a valve stem 3. One end of the valve stem 3 extends out of the guide tube 2 and is connected to the valve disc 8. A spring 13 is provided between the valve stem 3 and the guide tube 2. The valve disc 8 includes a straight section 6 and a curved section 7. A first sealing surface 5 that cooperates with one end of the curved section is provided in the middle of the valve body. The guide tube 2 is provided with a second sealing surface 4 that cooperates with the other end of the curved section. The curved section 7 protrudes toward the inlet cavity. Bending. When there is no medium pressure upstream, the elastic force of the spring 13 makes the bent section fit with the two sealing surfaces to form a seal. When the medium recoils and stops, since the bent section 7 bends toward the inlet cavity, it forms a buffer zone close to the outlet cavity for medium swirl buffering, which can alleviate the impact force of the backwash medium. The straight section 6 can accommodate the right side of the second sealing surface 4 of the guide cylinder 2, which is conducive to shortening the axial length of the valve body and diverting the backwash medium, so that part of the medium is diverted between the straight section 6 and the guide cylinder 2. The two sealing contact surfaces simultaneously alleviate the impact force generated by the medium impact and avoid severe backwash noise.
[0016] In this embodiment, the inner diameter of the inlet cavity 11 gradually decreases from the inlet end to the middle of the valve body, increasing the speed at which the upstream medium flows into the valve body, thereby increasing the pressure of the medium passing through. The valve flap curved section 7 is convex and curved toward the inlet cavity, which is conducive to the medium pushing the valve flap open and ensuring the normal passage of the medium.
[0017] In this embodiment, the straight section 6 is provided with a connecting plate 16, and one end of the valve stem 3 is fixed to the middle of the connecting plate 16 by a nut 17. The connecting plate 16 makes the valve disc 8 receive relatively uniform thrust from the valve stem 3, avoiding the valve disc tilting caused by uneven force.
[0018] In this embodiment, a spring seat 18 is provided at the end of the valve stem 3 arranged in the guide cylinder, and the guide cylinder 2 is provided with a pressure cover 9. One end of the spring 13 presses against the spring seat 18, and the other end presses against the pressure cover 9. The structure is simple and convenient to assemble. The pressure cover 9 is provided with a plurality of step surfaces 14 corresponding to the spring, which can be adapted to springs of different sizes and conveniently adjust the valve opening pressure of the valve. The pressure cover 9 is provided with a guide portion 15 along the circumference of the outer side of the valve stem to provide guidance for the lateral movement of the valve stem 3 to prevent it from deflecting.
[0019] In this embodiment, a lifting ring 10 is provided on the valve body 1. The lifting ring 10 can provide support during installation, improve installation efficiency, and facilitate installation when the axial space is narrow.
[0020] The embodiments should not be regarded as limiting the present invention, and any non-inventive improvements based on the spirit of the present invention should be regarded as falling within the protection scope of the present invention.
Claims
1. An ultra-short axial flow check valve comprising a valve body and a valve disc. A guide cylinder is fixed within the valve body, the guide cylinder dividing the flow passage of the valve body into upper and lower channels, the flow passage comprising an inlet cavity and an outlet cavity. A valve stem is passed through the guide cylinder, one end of the valve stem extending out of the guide cylinder and connected to the valve disc. A spring is provided between the valve stem and the guide cylinder, characterized in that: The valve flap includes a straight section and a curved section. The middle of the valve body is provided with a first sealing surface that cooperates with one end of the curved section. The guide tube is provided with a second sealing surface that cooperates with the other end of the curved section. The curved section is convex and curved toward the inlet cavity.
2. The ultra-short axial flow check valve according to claim 1, characterized in that: The inner diameter of the inlet cavity gradually decreases from the inlet end to the middle of the valve body.
3. The ultra-short axial flow check valve according to claim 1, characterized in that: The straight section is provided with a connecting plate, and one end of the valve stem is fixed to the middle of the connecting plate through a nut.
4. The ultra-short axial flow check valve according to claim 1, characterized in that: The end of the valve stem arranged in the guide cylinder is provided with a spring seat, and the guide cylinder is provided with a pressure cover. One end of the spring presses against the spring seat, and the other end presses against the pressure cover.
5. The ultra-short axial flow check valve according to claim 4, characterized in that: The gland is provided with a guide portion along the circumference of the outer side of the valve stem.
6. The ultra-short axial flow check valve according to claim 4, characterized in that: The pressure cover is provided with a plurality of step surfaces corresponding to the spring.
7. The ultra-short axial flow check valve according to claim 1, characterized in that: A lifting ring is provided on the valve body.