Check valve device with foreign object intrusion prevention function

Abstract

To prevent intrusion of foreign matter into a check valve to thereby prevent check leakage caused by foreign matter caught in a valve seat surface, with a result that increase in pipe pressure losses is suppressed even if periodic maintenance is not performed, thus enabling maintenance-free operation for an extended period of time.SOLUTION: A weir structure 5 is provided on a bottom surface of an inlet / outlet coupling portion of a check valve body 4 to prevent foreign matter such as dust accumulated on bottom portions of a pipe from being brought into the valve body. The weir structure 5 may be plate-shaped, mesh-shaped, or net-shaped; any structure is acceptable as long as it can prevent intrusion of foreign matter flowing into bottom portions of a pipe in a manner that does not impede fluid flow to the valve body as much as possible.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a check valve device that prevents foreign matter from entering the check valve and prevents check valve leakage caused by foreign matter biting into the valve seat surface.

Background Art

[0002] When check valve leakage occurs, fluid may flow backward to the primary side of the check valve where it should not flow originally, which may cause problems in the process and various devices. Among the factors causing check valve leakage, the most common one is foreign matter biting into the valve seat surface. Rust generated over time in the pipe or foreign matter mixed in from outside the system adheres to the valve seat surface of the check valve, resulting in poor closing performance and causing check valve leakage.

[0003] To prevent foreign matter from entering the check valve, a strainer may be installed on the primary side of the check valve. However, the strainer requires regular maintenance. If the maintenance is neglected, the strainer may become clogged, leading to an increase in pipe pressure loss, and the planned flow rate may not flow, which may have an adverse effect on the process. In a horizontal pipe, foreign matter such as dust tends to accumulate at the bottom of the pipe due to gravity, and the dust may be brought into the check valve along the bottom of the pipe.

[0004] In addition, in Patent Document 1 below, in a check valve device installed in a weep hole of a subterranean structure having a water passage, a valve body having a flow path installed in the weep hole, a main valve seat formed in the valve body facing the water passage side, and a main valve body that contacts and separates from the main valve seat are provided. A main check valve that allows the flow toward the water passage and prohibits the reverse flow, and a protection means arranged on the opening side of the weep hole from the operating region of the main valve body, which allows the flow toward the water passage and restricts the intrusion of foreign matter from the water passage into the operating region of the main valve body are disclosed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In a horizontal pipe, foreign matter easily flows along the bottom of the pipe. Especially in a steam pipe, a steam drain flow occurs at the bottom of the pipe, forming a two-layer flow pattern. Compared with the steam flow flowing in the pipe, the steam drain is more likely to collect foreign matter such as dust, and it is expected that foreign matter will be brought into the check valve through the flow of the steam drain.

[0007] In order to solve the above problems, the present invention provides a check valve device that prevents steam drain flowing along the bottom of the pipe from entering the check valve by providing a weir such as a mesh, a plate-like structure, or a net-like structure only at the bottom of the check valve, and also prevents foreign matter such as dust contained in the steam drain from entering the check valve by stopping it at the weir portion, thereby preventing foreign matter from entering the check valve and preventing check valve leakage due to foreign matter biting into the valve seat surface.

Means for Solving the Problems

[0008] The check valve device having a foreign matter intrusion prevention function of the present invention is a check valve device installed in a pipe having a flow path. It has a valve body installed between an inlet pipe and an outlet pipe and having a flow path, a valve seat formed on the valve body and facing the flow path side, a valve element that contacts and separates from this valve seat, and a check valve that allows the flow toward the flow path and prohibits the reverse flow. It is characterized in that a weir structure is provided on the bottom surface of the inlet and outlet connection part of the valve body.

[0009] In the device of the present invention, as the weir structure, a plate-like structure, a mesh-like structure, a net-like structure, etc. can be used. In short, any structure may be used as long as it can prevent the intrusion of foreign matter flowing at the bottom of the pipe in a form that does not inhibit the fluid flow to the valve element as much as possible.

[0010] In the device of the present invention, when the check valve device is used in a steam pipe, steam drain containing foreign matter blocked from entering the check valve by the weir structure can be discharged together with the steam drain from the steam traps (steam traps) installed before and after the check valve.

Advantages of the Invention

[0011] In the present invention, by providing a weir (dam) such as a mesh or a plate only at the bottom of the check valve, it is possible to prevent steam drain flowing along the bottom of the pipe from entering the check valve, and also to prevent foreign matter such as dust contained in the steam drain from entering the check valve by stopping it at the weir part, thereby preventing reverse leakage due to foreign matter biting into the valve seat surface. Further, by installing a weir only on a part of the bottom of the check valve, there will be no obstacles that increase the pressure loss in most of the pipe flow path, so the increase in pipe pressure loss like a strainer will not occur even without regular maintenance, and it is possible to operate without maintenance for a long time.

[0012] When the check valve device is used in a steam pipe, the steam drain containing foreign matter blocked from entering the check valve by the weir structure (weir structure part) is discharged together with the steam drain from the steam traps (steam traps) installed before and after the check valve, so that the disassembly and cleaning of the weir structure (weir structure part) are not required, and maintenance-free can be realized.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0014] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments and can be implemented with appropriate modifications.

[0015] In this embodiment, by providing a weir structure on the bottom surface of the inlet / outlet connection part of the check valve body, foreign matters such as dust accumulated at the bottom of the pipe are prevented from being brought into the valve body. Regarding the weir structure, a plate shape, a mesh shape, a net shape, etc. are conceivable, and any structure may be used as long as it can prevent the intrusion of foreign matters flowing at the bottom of the pipe in a form that does not impede the fluid flow to the valve body as much as possible.

[0016] FIG. 1 and FIG. 2 show an example of the schematic configuration of the check valve device of the present invention. In the check valve device 1, a valve body 4 is installed between the inlet pipe 2 and the outlet pipe 3. Although detailed illustration is omitted, the check valve device 1 is provided with a valve seat formed on the valve body 4 facing the flow path side, a valve body that contacts and separates from this valve seat, and a check valve that allows the flow toward the flow path and prohibits the reverse flow. A weir structure 5 is provided on the bottom surface of the inlet / outlet connection part of the valve body 4.

[0017] By providing the weir structure 5 only at the bottom of the check valve, it is possible to prevent the steam drain flowing along the bottom of the pipe from entering the check valve, and for foreign matters such as dust contained in the steam drain, by stopping them at the weir part, it is possible to prevent the intrusion of foreign matters into the check valve and prevent check valve leakage due to foreign matters biting into the valve seat surface. Also, by installing the weir structure 5 only on a part of the bottom of the check valve, there will be no obstacle that increases the pressure loss in most of the pipe flow path, so the increase in pipe pressure loss like a strainer will not occur even without regular maintenance, and it becomes possible to operate without maintenance for a long time.

[0018] FIG. 3 is an example of a configuration in which a steam trap is installed before and after the check valve when the check valve device is used in a steam pipe to achieve an automatic cleaning effect (maintenance-free) by steam drain. The steam drain containing foreign matter blocked from entering the check valve device 1 by the weir structure 5 is discharged together with the steam drain from the steam traps 6 and 7 installed before and after the check valve, eliminating the need for disassembling and cleaning the weir structure 5 (weir structure section). Specifically, the steam trap 6 is provided in the steam drain discharge pipe 8 branched from the inlet pipe 2. Similarly, the steam trap 7 is specifically provided in the steam drain discharge pipe 9 branched from the outlet pipe 3.

Explanation of Reference Numerals

[0019] 1 Check valve device 2 Inlet pipe 3 Outlet pipe 4 Valve body 5 Weir structure 6, 7 Steam traps 8, 9 Steam drain discharge pipes

Claims

1. In a check valve device installed in a pipe having a flow path, a valve body installed between an inlet pipe and an outlet pipe and having a flow path, a valve seat formed on the valve body and facing the flow path side, a valve element that contacts and separates from this valve seat, and a check valve that allows the flow toward the flow path and prohibits the reverse flow. A check valve device having a foreign matter intrusion prevention function, characterized in that a weir structure for preventing the intrusion of foreign matter contained in steam drain is provided on the bottom surface of the inlet / outlet connection part of the valve body.

2. The check valve device having a foreign matter intrusion prevention function according to claim 1, wherein the weir structure is any one of a plate-like structure, a mesh-like structure, and a net-like structure.

3. When the check valve device is used in a steam pipe, the steam drain containing foreign matter whose intrusion into the check valve is blocked by the weir structure is discharged together with the steam drain from steam traps installed before and after the check valve. The check valve device having a foreign matter intrusion prevention function according to claim 1 or 2.

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