Check valve with safety valve

Abstract

This utility model relates to a check valve with a safety valve, comprising an outer valve body and an inner valve seat. The outer valve body has a closed end and an open end, and the inner valve seat is coaxially inserted into the closed end of the outer valve body. It also includes a pressure relief assembly disposed at the closed end of the outer valve body. The pressure relief assembly includes: a pressure relief port, located at the closed end of the outer valve body, for communicating with the outside; and a sealing element, slidably disposed on the outer valve body, which normally seals the pressure relief port and can slide open to relieve pressure in case of overload. In this utility model, the linkage ring in the pressure relief assembly forms a mechanical linkage with the valve core. When the medium pressure is overloaded, the linkage ring slides axially and actively forces the valve core to seal the inner valve seat, while simultaneously opening the pressure relief port to release pressure. Unlike traditional check valves that passively close due to medium backflow, this solution achieves a dual action of "actively closing the check channel + synchronous pressure relief" through the pressure relief assembly, thus improving the response speed.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and specifically relates to a check valve with a safety valve. Background Technology

[0002] In fluid transport systems such as petroleum, chemical, and water supply and drainage systems, check valves are critical components that prevent backflow of media, and their safety and reliability directly affect system operation. Traditional check valves face the following technical challenges in practical applications: System safety hazards caused by pressure overload; Existing check valves lack integrated pressure relief protection. When the system experiences an abnormal pressure surge, the medium pressure may exceed the equipment's tolerance limit, leading to pipeline rupture or equipment damage. For example, in oil pipelines, the pressure surge caused by valve malfunction can reach 3-5 times the normal operating pressure. Traditional check valves cannot relieve pressure in time, and statistics show that approximately 40% of pipeline leakage accidents originate from such overload problems.

[0003] Synergistic failure of check valve and pressure relief functions; Some systems use a parallel connection of check valves and safety valves, but this approach has the following drawbacks: Response delay: When the safety valve operates independently, the check valve remains open, and the medium may flow back during the depressurization process, causing secondary malfunctions; Complex structure: Parallel installation increases pipeline resistance and leakage points, and occupies a large space, making it unsuitable for compact scenarios such as offshore platforms and underground operations. Utility Model Content

[0004] This utility model addresses the problems of the prior art by providing a check valve with a safety valve. The specific technical solution is as follows: A check valve with a safety valve includes an outer valve body and an inner valve seat. The outer valve body has a closed end and an open end, and the inner valve seat is coaxially inserted into the closed end of the outer valve body. It also includes a pressure relief assembly disposed at the closed end of the outer valve body, the pressure relief assembly comprising: The pressure relief port is located at the closed end of the outer valve body and is used to connect the outer valve body to the outside. A sealing element is slidably mounted on the outer valve body, which blocks the pressure relief port under normal conditions and can slide open the pressure relief port to relieve pressure when the pressure is overloaded; Spring 2 is pre-compressed and connected between the plug and the outer valve body. Under normal conditions, it forces the plug to block the pressure relief port, and under pressure overload, it further compresses and cooperates with the sliding of the plug.

[0005] As a further technical solution of this utility model, the pressure relief port is provided in several groups and evenly distributed around the circumference.

[0006] As a further technical solution of this utility model, the insertion end of the inner valve seat is fitted with a valve core, and a spring is connected between the valve core and the inner valve seat. The spring is pre-stretched and connected between the valve core and the inner valve seat.

[0007] As a further technical solution of this utility model, the sealing component includes a sealing ring, a linkage ring, and a connecting rod. The sealing ring and the linkage ring are respectively disposed outside and inside the outer valve body. The connecting rod is connected between the sealing ring and the linkage ring to enable them to move synchronously. Under normal conditions, the sealing ring fits against the outer surface of the closed end and seals the pressure relief port. When the pressure is overloaded, the linkage ring moves axially and forces the valve core to seal the inner valve seat.

[0008] As a further technical solution of this utility model, the linkage ring is designed with a hollow structure to allow the medium to pass through.

[0009] The beneficial effects of this utility model are as follows: (1) Synchronous control mechanism for pressure relief and check valve; The linkage ring in the pressure relief assembly forms a mechanical linkage with the valve core. When the medium pressure is overloaded, the linkage ring slides axially and actively forces the valve core to block the inner valve seat, while opening the pressure relief port to release pressure. Unlike traditional check valves that rely solely on the backflow of the medium for passive closure, this solution achieves a dual action of "actively closing the check channel + synchronous pressure relief" through a pressure relief component, thus improving the response speed. The hollow design of the linkage ring ensures that the medium can still pass through during pressure relief, avoiding a sudden pressure rise due to throttling and achieving smooth control of the pressure relief process.

[0010] (2) Circumferential uniform pressure relief and dynamic sealing structure; The pressure relief ports are evenly distributed around the closed end of the outer valve body, and the sealing element is connected to the inner valve seat through a pre-compression spring, forming a synergistic design of annular sealing and uniform pressure relief.

[0011] Multiple sets of circumferentially distributed pressure relief ports ensure even release of overload pressure, preventing valve body deformation caused by local high pressure and improving pressure relief efficiency. Furthermore, the pre-compression force of spring two can be adjusted according to the working conditions to achieve precise control of the pressure relief threshold, while dynamically compensating for the wear of the sealing components and maintaining sealing reliability.

[0012] (3) Precise motion control driven by dual springs; Spring 1 pre-tension drives the valve core to normally close, while spring 2 pre-compresses to maintain the seal of the plugging component. The two are coupled through a linkage ring to transmit force.

[0013] The dual-spring system enables independent adjustment of the "check valve sealing force" and the "pressure relief trigger force," ensuring both the sealing reliability of the check valve and the precise setting of the pressure relief threshold. When the pressure is overloaded, the compression of spring 2 is linearly related to the sliding displacement of the linkage ring, ensuring the synchronicity and repeatability of the valve core closing and pressure relief action. Attached Figure Description

[0014] Figure 1 A schematic diagram of the overall structure of a check valve with a safety valve is shown. Figure 2 A schematic diagram of the internal structure of a check valve with a safety valve is shown.

[0015] Legend: 100. Outer valve body; 110. Closed end; 120. Open end; 200. Inner valve seat; 300. Valve core; 400. Spring 1; 500. Pressure relief assembly; 510. Pressure relief port; 520. Sealing component; 521. Sealing ring; 522. Linkage ring; 523. Connecting rod; 530. Spring 2. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0017] Figure 1 A schematic diagram of the overall structure of a check valve with a safety valve is shown. Figure 2 A schematic diagram of the internal structure of a check valve with a safety valve is shown.

[0018] Figure 1 The check valve with a safety valve includes: The outer valve body 100 has a closed end 110 and an open end 120. The inner valve seat 200 is coaxially inserted into the outer valve body 100 from the closed end 110; the medium flows from the inner valve seat 200 to the outer valve body 100.

[0019] Figure 2 In the design, the valve core 300 is attached to the insertion end of the inner valve seat 200. A spring 400 connects the valve core 300 and the inner valve seat 200. In actual use, the valve core 300 is attached to and seals the insertion end of the inner valve seat 200, achieving normal closure. When the water supply end is opened, the medium pushes open the valve core 300 and flows to the inner valve seat 200 to achieve water supply. The spring 400 is further stretched. When the water supply end is closed, the pressure on both sides of the valve core 300 is balanced. It is pulled back by the elastic force of the spring 400 and re-seals the insertion end of the inner valve seat 200 to form a check valve.

[0020] See also Figure 2 A pressure relief assembly 500 is also provided at the closed end 110 of the outer valve body 100. The pressure relief assembly 500 includes: The pressure relief port 510 is located at the closed end 110 of the outer valve body 100 and is used to connect the outer valve body 100 with the outside. Several sets of pressure relief ports 510 are provided and evenly distributed around the circumference. By using the pressure relief port 510, pressure can be relieved in time when the medium pressure is overloaded, which is beneficial to the stability of water supply at the water end. The sealing element 520 is slidably disposed on the outer valve body 100. Under normal conditions, it seals the pressure relief port 510 and can slide open the pressure relief port 510 to relieve pressure when the pressure is overloaded. Here, "slidable" means relative to the outer valve body 100 and the inner valve seat 200, and the sliding direction is axial. Spring 530 is connected between the plugging component 520 and the outer valve body 100. Under normal conditions, it forces the plugging component 520 to block the pressure relief port 510, and further compresses the sliding of the plugging component 520 when the pressure is overloaded. Spring 530 is used to further increase the sealing strength of the plugging component 520 on the pressure relief port 510, ensuring the stability of the plugging component 520 under normal medium pressure and ensuring the normal use of the valve core 300 and spring 400. It should be noted that the pre-compression strength of spring 530 is not specifically limited and can be set as needed, that is, the overload pressure relief judgment threshold can be set independently.

[0021] The sealing element 520 includes a sealing ring 521, a linkage ring 522, and a connecting rod 523. The sealing ring 521 and the linkage ring 522 are respectively disposed outside and inside the outer valve body 100. The connecting rod 523 is connected between the sealing ring 521 and the linkage ring 522 to enable them to move synchronously. Under normal conditions, the sealing ring 521 fits against the outer surface of the closed end 110 and blocks the pressure relief port 510. When the pressure is overloaded, the linkage ring 522 moves axially and forces the valve core 300 to block the inner valve seat 200. That is, when the pressure is overloaded, the axial sliding of the linkage ring 522 can interfere with the valve core 300, and can actively drive the valve core 300 to close the inner valve seat 200, thus preventing the continuous occurrence of the passage under the pressure relief state.

[0022] It should be noted that the linkage ring 522 has a hollow design to allow the medium to pass through. This is to prevent the linkage ring 522 from blocking the flow of the medium when it interferes with the valve core 300, and to ensure that the throttling area is not reduced when the medium flows.

[0023] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A check valve with a safety valve, comprising an outer valve body (100) and an inner valve seat (200), the outer valve body (100) having a closed end (110) and an open end (120), the inner valve seat (200) being coaxially inserted into the outer valve body (100) from the closed end (110); characterized in that It also includes a pressure relief assembly (500) disposed at the closed end (110) of the outer valve body (100), the pressure relief assembly (500) comprising: A pressure relief port (510) is provided at the closed end (110) of the outer valve body (100) to connect the outer valve body (100) with the outside. A sealing element (520) is slidably disposed on the outer valve body (100), which blocks the pressure relief port (510) under normal conditions and can slide open the pressure relief port (510) to relieve pressure when the pressure is overloaded; And spring two (530), which is pre-compressed and connected between the plug (520) and the outer valve body (100), forces the plug (520) to block the pressure relief port (510) under normal conditions, and further compresses the sliding of the plug (520) when the pressure is overloaded; The pressure relief port (510) is provided in several groups and is evenly distributed around the circumference.

2. The check valve with safety valve according to claim 1, characterized in that: The valve core (300) is attached to the insertion end of the inner valve seat (200), and a spring (400) is connected between the valve core (300) and the inner valve seat (200). The spring (400) is pre-stretched and connected between the valve core (300) and the inner valve seat (200).

3. The check valve with safety valve of claim 2, wherein: The sealing component (520) includes a sealing ring (521), a linkage ring (522), and a connecting rod (523). The sealing ring (521) and the linkage ring (522) are respectively disposed outside and inside the outer valve body (100). The connecting rod (523) is connected between the sealing ring (521) and the linkage ring (522) to make them move synchronously. Under normal conditions, the sealing ring (521) fits against the outer surface of the closed end (110) and seals the pressure relief port (510). When the pressure is overloaded, the linkage ring (522) moves axially and forces the valve core (300) to seal the inner valve seat (200).

4. The check valve with safety valve of claim 3, wherein: The linkage ring (522) is designed with a hollowed-out shape to allow the medium to pass through.

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