JP2023110934A - Gasket having foreign matter intrusion prevention function - Google Patents

Abstract

To prevent a steam drain flowing along a piping bottom part in a piping system from intruding into an apparatus such as a check valve and a drain trap installed in the piping system, also, to prevent foreign matters such as rubbishes contained in the piping system from intruding into the check valve and the drain trap installed in the piping system, to prevent the occurrence of a cutoff-malfunction caused by the bite-in of the foreign matters to a valve seat face, and to avoid an increase of a piping pressure loss like in the case of a strainer even if periodical maintenance is not performed, thus enabling an operation without long-term maintenance.SOLUTION: Foreign matters such as rubbishes accumulated in a bottom part of piping are prevented from intruding into an apparatus such as a check valve and a drain trap installed in a piping system by arranging a weir structure 4 at a bottom face of a gasket 1 for use in the attachment of the apparatus to the piping system. A plate-shaped structure, a mesh-shaped structure and a net-shaped structure may be employed to the weir structure 4, and any type of a structure which can prevent the intrusion of the foreign matters flowing in the bottom part of the piping in a form not disturbing a flow of fluid in the piping as much as possible may be employed.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a gasket that prevents foreign matter from entering the valve seat surface of devices such as check valves and drain traps, and prevents problems in processes and various connected devices caused by foreign matter getting caught on the valve seat surface.

If check valves, drain traps, and other equipment installed in piping systems become clogged with dust, fluid may flow into systems where it should not flow, causing problems with processes and various connected equipment. Dust entrapment is foreign matter caught on the valve seat surface of equipment such as check valves and drain traps. Rust generated over time in the piping system and foreign matter mixed in from outside the system adhere to the valve seat surface of the equipment. However, it is known that the cut-off performance is poor.

In order to prevent foreign matter from entering equipment such as check valves and drain traps installed in the piping system, a strainer may be installed on the primary side of the equipment, but the strainer requires regular maintenance. If maintenance is neglected, the strainer will become clogged, leading to an increase in pressure loss in the piping, which may adversely affect the process because the planned flow rate will not flow.
In horizontal piping, foreign matter such as dust tends to stay at the bottom of the piping due to gravity, and dust may be carried along the bottom of the piping to the check valve.

Further, Patent Document 1 below discloses a device for preventing foreign objects from entering a general-purpose engine, in which a muffler and a filter are arranged above the engine, and a blower housing containing a cooling fan is arranged below the filter side. A gasket mounted between the exhaust port of the engine and the muffler is provided with an extended portion that covers a gap between the muffler and the filter that communicates with the blower housing. ing.

JP 2004-251148 A

In a horizontal pipe, foreign matter tends to flow along the bottom of the pipe. Especially in a steam pipe, drain flow of steam occurs at the bottom of the pipe, forming a two-layer flow. Compared to the steam flow that flows through the piping, the steam drain tends to collect foreign matter such as dust. is expected.

Gaskets are intended to block fluid between the primary side and the secondary side in a structure, and are processed into various shapes depending on the shape of the structure that requires fluid blocking.
The gasket shape can be changed arbitrarily, but the purpose is to block the fluid, and it is not used for the purpose of adding a foreign matter intrusion function to other equipment by installing the gasket.
The present invention proposes a new additional function to the gasket.

In order to solve the above problems, the present invention provides a mesh, plate-like, or net-like weir only at the bottom of a gasket used when installing equipment such as check valves and drain traps installed in a piping system into piping. By providing a weir, the steam drain that flows along the bottom of the pipe is prevented from entering equipment such as check valves and drain traps installed in the piping system, and dust contained in the steam drain is prevented. By stopping foreign matter at the weir, it is possible to prevent foreign matter from entering equipment such as check valves and drain traps installed in the piping system, and prevent poor shutoff performance due to foreign matter getting caught in the valve seat surface. It provides a gasket that

The gasket having the function of preventing foreign matter intrusion according to the present invention is a gasket that is installed between two members facing each other through which a fluid flows and maintains a sealing property, and prevents foreign matter from entering the bottom of the cavity of the gasket body through which the fluid flows. It is characterized by providing a weir structure for

In the gasket of the present invention, a plate-like structure, a mesh-like structure, a net-like structure, or the like can be used as the weir structure. In short, any structure may be used as long as it can prevent foreign matter flowing to the bottom of the pipe from entering while minimizing the obstruction of the fluid flow inside the pipe.

In the gasket of the present invention, when the gasket is used in a steam pipe, the gasket is installed on the inlet side and outlet side of a check valve, and the gasket is installed on the inlet side and outlet side of a steam trap (steam trap). The steam drain containing foreign matter blocked from entering the check valve by the structure can be discharged together with the steam drain from the steam trap system installed before and after the check valve. The steam drain containing the foreign matter blocked from entering the check valve by the weir structure can be discharged together with the steam drain from the steam trap bypass valve.

The present invention provides a mesh, plate-like, or net-like weir only at the bottom of a gasket used when installing devices such as check valves and drain traps installed in a piping system into the piping, thereby reducing the bottom of the piping. Prevents the steam drain that flows along the line from entering devices such as check valves and drain traps installed in the piping system. , prevent foreign matter from entering equipment such as check valves and drain traps installed in the piping system, and prevent poor shutoff performance due to foreign matter getting caught on the valve seat surface. In addition, by installing a weir only at the bottom of the gasket, there are no obstacles that increase pressure loss in most of the piping flow path. No increase occurs, and long-term operation without maintenance is possible.

When gaskets are used in steam piping, steam drain containing foreign matter that has been prevented from entering the check valve by the weir structure (weir structure) is discharged from the steam trap (steam trap) installed before and after the check valve. By being discharged together with the steam drain, it becomes unnecessary to disassemble and clean the weir structure (weir structure part), and maintenanceless can be realized.

FIG. 1 is an explanatory front view showing an example of a schematic configuration of a gasket having a foreign matter intrusion prevention function of the present invention. FIG. 2 is a side cross-sectional explanatory view showing an example of a schematic configuration of a gasket having a foreign matter intrusion prevention function of the present invention. FIG. 3 is a side cross-sectional explanatory view showing an example of a schematic configuration in the case of installing a gasket having a foreign matter intrusion prevention function of the present invention on a flange provided on a horizontal pipe. FIG. 4 is an explanatory diagram showing an example of a schematic configuration in the case of using the gasket having the function of preventing foreign matter from entering according to the present invention in a steam pipe.

Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to the following embodiments and can be implemented with appropriate modifications.
The purpose of the gasket is to block the fluid between the primary side and the secondary side in the structure, and it is processed into various shapes depending on the shape of the structure that needs to block the fluid. As far as this is concerned, the shape of the gasket can be changed arbitrarily.

In this embodiment, as an example, the inner ring of the spiral gasket with inner and outer rings is specially designed to provide a weir structure. The height of the weir structure can be arbitrarily determined. In addition, the weir structure may be plate-like, mesh-like, or net-like, and may be of any structure as long as it can prevent foreign matter from entering the bottom of the pipe while not impeding the fluid flow inside the pipe as much as possible. . Gasket materials include joint sheets (rubber-based, graphite-based, fiber-based, Teflon (registered trademark)-based, and other composite materials), semi-metals (combining metal hoop materials and filler materials, etc.), metal materials ( metals in general), etc. can be used.

1 and 2 show an example of the schematic configuration of the gasket of the present invention.
In the gasket 1 used when installing equipment such as a check valve and a drain trap installed in a piping system into the piping, a weir structure for preventing foreign matter from entering is provided at the bottom of the cavity 3 of the gasket body 2. A body 4 is provided. This gasket 1 is installed on a flange portion provided in a pipe to maintain sealing performance, and is also used when installing equipment such as a check valve and a drain trap installed in the piping system into the pipe.

FIG. 3 shows an example of a schematic configuration when the gasket shown in FIGS. 1 and 2 is installed on a flange provided on a horizontal pipe.
A function to prevent dust from entering check valves, steam traps, etc. (not shown in FIG. 3) by installing a gasket 1 incorporating a weir structure 4 on a flange portion 6 provided on a horizontal pipe 5. is exhibited.

In this way, by providing a weir structure on the bottom surface of the gasket used when installing equipment in the piping system, foreign matter such as dust accumulated at the bottom of the piping can be installed in the piping system such as check valves and drain traps. prevent it from being brought into the equipment. In more detail, by installing a mesh, plate-like or net-like weir only at the bottom of the gasket used when installing equipment such as check valves and drain traps installed in the piping system, the bottom of the pipe can be removed. Prevents the steam drain that flows along the line from entering devices such as check valves and drain traps installed in the piping system. , prevent foreign matter from entering equipment such as check valves and drain traps installed in the piping system, and prevent poor shutoff performance due to foreign matter getting caught on the valve seat surface. In addition, by installing a weir only on a part of the bottom of the gasket, there are no obstacles that increase pressure loss in most of the piping flow path. No increase occurs, and maintenance-free operation is possible for a long period of time. Also, by providing a weir-structured gasket in front of the steam trap system, the drain discharge section to the steam trap system can be clarified, and efficient steam drain discharge can be realized.

Fig. 4 shows an example of a configuration in which a steam trap (steam trap) is installed before and after the check valve to achieve an automatic cleaning effect (maintenance-free) by steam drain when the gasket is used in steam piping. be.

A gasket 1 is installed on the inlet side and the outlet side of the check valve 7, and the gasket 1 is installed on the inlet side and the outlet side of the steam traps (steam traps) 8, 9. The steam drain containing the foreign matter prevented from entering the check valve 7 in step 1 can be discharged together with the steam drain from the steam traps 8 and 9 installed before and after the check valve 7 . Specifically, the steam trap 8 is provided in a steam drain discharge pipe 11 branched from the inlet pipe 10 . Similarly, the steam trap 9 is specifically provided in a steam drain discharge pipe 13 branched from the outlet pipe 12 . Bypass lines 14 and 15 for discharging contaminants in the drain are provided in front of the steam traps 8 and 9 . 16 and 17 are steam trap bypass valves.
Steam drain containing foreign matter blocked from entering the check valve 7 by the weir structure 4 provided in the gasket 1 is discharged together with the steam drain from the steam traps 8 and 9 installed before and after the check valve. , disassembly cleaning of the weir structure 4 becomes unnecessary. In addition, by providing a weir-structured gasket in front of the steam trap system, the drain discharge section to the steam trap system can be clarified, and efficient steam drain discharge can be realized.

1 gasket 2 gasket body 3 cavity 4 weir structure 5 horizontal pipe 6 flange 7 check valve 8, 9 steam trap 10 inlet pipe 11, 13 steam drain discharge pipe 12 outlet pipe 14, 15 bypass line 16, 17 steam trap bypass valve

Claims (3)

A gasket that is installed between two members facing each other through which a fluid flows and maintains a sealing property, characterized in that a dam structure for preventing foreign matter from entering is provided at the bottom of a hollow portion of a gasket body through which the fluid flows. A gasket that has a foreign matter intrusion prevention function. 2. The gasket according to claim 1, wherein the weir structure is one of a plate-like structure, a mesh-like structure and a net-like structure. When using gaskets in steam piping, install gaskets on the inlet and outlet sides of the check valve and on the inlet and outlet sides of the steam trap to prevent intrusion into the check valve with a weir structure. The steam drain containing blocked foreign matter can be discharged together with the steam drain from the steam trap system installed before and after the check valve. 3. The gasket according to claim 1 or 2, wherein the steam drain containing the foreign matter blocked is discharged together with the steam drain from the steam trap bypass valve.

Images