JPS6353424B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a ball valve with a strainer, and more specifically, a ball valve with a strainer that prevents fluid from flowing out when a filter element constituting the strainer is removed. It concerns valves.

(Prior art) Strainers, which are conventionally installed in front of valves, circulation pumps, etc. and used for the purpose of removing earth, sand, iron chips, etc. from pipelines, are connected to appropriate places on the side of the main pipe. Generally, a filter element is provided within the branch pipe. However, with this type of strainer, when cleaning, repairing, or replacing the filter element, the upstream valve must first be closed to prevent fluid from flowing out, and the valve must be placed in a remote location. It was very troublesome and caused a lot of fluid to leak out. Furthermore, if there is no valve on the downstream side of the strainer, there is a problem in that when the filter element is removed, the fluid on the downstream side flows out. Therefore, in order to prevent fluid from flowing out when the filter element is removed, valves are required before and after the strainer, requiring a total of three devices.

As a solution to these problems, a strainer with a fluid outflow prevention device was introduced in 1986-20020.
has been disclosed. The strainer has a branch pipe diagonally installed at an appropriate location on the side of the main pipe, a filter cylinder is provided in the branch pipe, and a valve that closes when the filter cylinder in the branch pipe is removed is installed in the primary flow path of the main pipe. In addition, a check valve is installed in the secondary flow path of the main pipe. In other words, when the filter cylinder in the branch pipe is removed, the valves and check valves provided on the primary and secondary sides of the main pipe operate to prevent fluid from the upstream and downstream sides from flowing into the branch pipe. This is what I did.

(Problems to be Solved by the Invention) However, the above strainer has the following problems. In other words, although the strainer is one piece of equipment, it is actually made up of two pieces: a valve + tube and a valve, and the strainer is connected to the primary side of the main pipe and It is necessary to install a valve and a check valve in the secondary flow path, which complicates the structure, requires a large number of parts, takes time to assemble, and increases manufacturing costs.

In addition, if the valve or check valve is clogged with foreign matter in the fluid or malfunctions, it will malfunction and cannot close the flow of fluid, so if the filter tube is removed, the upstream side or Downstream fluid may escape and, in some cases, a trip may be required to close a remote valve.

Furthermore, since the valves and check valves are installed in the flow path, fluid resistance increases. That is,
Fluid pressure loss on the upstream and downstream sides of the strainer increases.

The present invention was made in view of the problems of the prior art as described above, and its purpose is to provide a simple structure consisting of essentially one device, which prevents fluid from flowing out when the filter element is removed. An object of the present invention is to provide a ball valve with a strainer.

(Means for Solving the Problems) In view of the problems of the above-mentioned prior art, the present inventors have
As a result of various studies on a strainer with a simple structure that allows the filter element to be easily removed without causing fluid to flow out, we focused on a three-way ball valve that can change the direction of fluid flow in two directions. The inventors have discovered that the above object can be fully achieved by installing a filter element inside the branch pipe, and have completed the present invention.

That is, the measures taken to solve the problems of the present invention include an inlet flow path and an outlet flow path that share an axis, a branch flow path that intersects with the flow path in a T shape, and In a ball valve that includes a ball inside that has a substantially L-shaped inlet hole and an outlet hole that communicate with a branch flow path, a cylindrical filter element is provided in the branch pipe forming the branch flow path. one end of which is fitted into the end of the outlet hole of the ball, the other end of which is fixed with a lid that is removably attached to the outer end attachment port of the branch pipe; The ball is characterized in that a spherical portion facing the outlet passageway opposite to the inlet passageway is provided with a throughhole for guiding the fluid that has passed through the filter element to the outlet passageway.

The ball valve forming the basic structure of the present invention may be made of metal or plastic, and its material is not particularly limited. In addition, the structure may be one in which a union or ball holder that holds the ball via a seat is attached to the valve body from both sides or one side, or a type in which the attachment is simply inserted, glued, or screwed. often,
This is also not particularly limited.

The strainer part in the present invention includes a branch pipe forming a branch pipe that intersects in a T-shape with the inlet flow path and the outlet flow path of the ball valve main body, a filter element installed inside the branch pipe, and the filter element. It consists of a lid that is removably attached to the outer end of the branch pipe to which it is fixed.

In the present invention, the above-mentioned "intersecting in a T-shape" does not necessarily mean perpendicular to the axes of the inlet flow path and the outlet flow path, but may also mean being slightly displaced with respect to the orthogonal axis. This means that it also includes.

The filter element installed in the branch pipe has a cylindrical shape, and one end of the filter element is approximately L.
It is fitted into the end of the outlet hole of a ball having a letter-shaped hole. The method of fitting the filter element into the end of the outlet hole is not particularly limited, but for example, a method of fitting a filter element with an O-ring attached to the outer peripheral end into the end of the outlet hole as it is, Examples include a method in which an annular notched groove is provided at the end of the outlet hole, and a filter element having an O-ring attached to the outer peripheral end or end face is fitted into the groove. The cross-sectional shape of the fitting portion of the filter element that fits into the outlet hole is provided to be the same as that of the outlet hole. Therefore, the shape may be circular or semicircular, and is not limited to this. On the other hand, the other end is fixed by a lid detachably attached to the outer end attachment port of the branch pipe.

The filter element is composed of a substantially cylindrical mesh tube and a reinforcing tube with a large number of openings arranged around the outer circumference or a grid-like frame, and both ends of the mesh tube. A common shape is one with a ring-shaped reinforcing frame attached to the outer periphery, but it is not particularly limited as long as it has the ability to filter out foreign matter in the flow path. .

Suitable materials for the mesh-shaped overtube serving as a filter include metal, plastics such as polyolefin resin, polyamide resin, and polyester resin, and composites thereof, but are not limited to these. do not have.

Further, the mesh can be freely selected depending on the size of foreign matter in the fluid.

One end of the filter element is open because it must communicate with the outlet hole of the ball, while the other end, which is fixed by the lid, is
Must be closed. The occlusion method includes:
Attach the other end of the filter element to the socket provided inside the lid, or attach a flat packing to the inside of the lid, and press the other end of the filter element together with the lid to close it. There are various methods, but any method may be used as long as the opening at the other end of the filter element is closed and the filter element is fixed.

Further, the lid may be provided with a drain in order to remove foreign matter in the fluid accumulated in the filter element and drain in the branch pipe. The drain may be removed by any commonly used method such as a plug method or a plug method. Incidentally, in order to reduce the loss of fluid pressure on the upstream and downstream sides, it is better to provide the branch pipe with a diameter and length as large as possible.

The ball, which is rotatably mounted inside the main body of the ball valve, has an inlet hole and an outlet hole that are connected in a substantially L-shape to communicate the inlet flow path and the branch flow path inside the valve body. As described above, one end of the filter element constituting the strainer section is fitted into the end of the outlet hole.

A cylindrical through hole for guiding the fluid that has passed through the filter element to the outlet flow path is provided in the spherical portion of the ball facing the outlet flow path, which faces the inlet hole. The through hole is preferably provided so that the opening area is as large as possible, and the through hole should be formed so that the spherical surface that is in contact with the sheet that has a sealing effect is left partially, and the hole is formed near the upstream side of the contact portion. This can be obtained by providing a notch groove in the direction of the tip of the spherical part. Furthermore, it is preferable to provide a notch in which the spherical part located downstream of the part in contact with the sheet is cut out in a direction perpendicular to the flow path axis, since this reduces fluid resistance. Furthermore, in order to increase the cross-sectional area of the notched groove, a method of setting the cross-section of the outlet hole of the ball in a semicircular shape and providing a large notched hole that communicates the branch flow path with the outlet flow path is also adopted. (See FIGS. 4 and 5) As described above, the reason why the contact portion of the spherical portion with the seat is left partially is to hold the ball to prevent it from wobbling.

(Operation) By rotating the handle that is engaged with the ball via the stem, the ball is rotated and the inlet flow path of the valve body and the branch flow path are communicated.
The upstream fluid flows from the inlet channel to the branch channel via a substantially L-shaped through hole inside the ball. The fluid that has flowed into the branch channel passes through the mesh-like tube of the filter element, passes through a hole provided in the spherical part of the ball facing the outlet channel of the valve body, and enters the outlet channel. It flows out.

Since the space between the filter element and the end of the outlet hole of the ball is sealed by a seal ring attached to the filter element,
The fluid flowing through the approximately L-shaped through hole in the ball is prevented from leaking directly to the outside of the filter element.

The foreign matter in the fluid that has flowed into the branch flow path is separated by the mesh-like tube of the filter element, and either adheres to the tube or accumulates at the bottom of the filter element that is blocked.

If a large amount of foreign matter in the fluid is collected in the mesh tube of the filter element and it becomes necessary to clean it, or if the filter element is damaged and needs to be replaced, turn the handle. By doing so, the ball is moved to the closed position, that is, the communication between the inlet flow path and the branch flow path of the valve body, and the communication between the branch flow path and the outlet flow path is cut off, and then it can be freely attached to and removed from the outer end attachment port of the branch pipe. What is necessary is to remove the lid attached to the branch pipe and fixing the filter element from the branch pipe, and then take out the filter element from inside the branch pipe.

(Example) Hereinafter, the present invention will be explained in more detail based on the example drawings.

FIG. 1 is a front vertical sectional view of a hard vinyl chloride resin ball valve with a strainer in an open state, showing an embodiment of the present invention.

In the figure, 1 has a pipe connection part 1a and a flow path 1b (in the figure, an outlet flow path, hereinafter referred to as an outlet flow path) at one end (downstream end in the figure), and at the other end. , a union 2 having a pipe connection part 2a and a flow path (inlet flow path in the figure, hereinafter referred to as inlet flow path) 2b is inserted and bonded, and a branch flow path 3a that is orthogonal to both flow paths in a T-shape is formed. This valve body is integrally provided with a branch pipe 3 to form the valve body.

4 is a ball rotatably supported in the internal central valve chamber of the valve body 1. The ball 4 is
It is held between a seat 6 attached to the side of the union 2 facing the ball 4 and a seat 7 attached to the side of the valve body 1 facing the ball 4. Inside the ball 4, there is an inlet hole 4a that communicates with the inlet channel 2b, and an outlet hole 4b that is perpendicular to this and communicates with the branch channel 3a. An annular notch groove 4c is provided in the portion. Further, a spherical portion facing the outlet flow path opposite to the inlet passage hole 4a is cut out in a direction perpendicular to the flow path axis, and the branch flow path 3a
A perpendicular through hole 4d is cut out to guide the fluid flowing into the outlet channel 1b. (See Figure 2) 5 is installed in the branch pipe 3, and the branch pipe 3 and
It is a cylindrical filter element that forms a strainer together with the lid 11 described later.

The filter element 5 consists of a cylindrical overtube 5a made of mesh-like polyethylene resin, and a lattice-shaped reinforcing tube 5b made of hard vinyl chloride arranged around the outer periphery of the overtube 5a and fixing the overtube 5a. There is. (See FIG. 3) The upper end of the filter element 5 is open, and the ball 4 is inserted through an O-ring 8 installed in an annular groove 5c provided on the outer periphery of the upper end of the reinforcing cylinder 5b. It is fitted into the annular notch groove 4c. On the other hand, the lower end of the filter element 5 has a flange 5d provided on the outer periphery of the reinforcing cylinder 5b.
A seal gasket 9 is fitted around the lid, and a circular flat gasket 10 is further brought into contact to close the lower end opening, and the outer end (lower end in the figure) is screwed onto the outer periphery of the mounting port 3b. It is fixed by the body 11.

That is, the lid 11 functions to press and fix the filter element 5 against the ball 4.

12 is a stem fitted into an engagement groove provided on the upper part of the ball 4.

13 is a handle fitted and fixed to the upper part of the stem 12.

In the ball valve with a strainer of this embodiment, by rotating the handle 13, the ball 4
When opened, fluid flowing from the upstream pipeline flows through the inlet channel 2 formed by the union 2.
b, and flows into the branch channel 3a via the inlet hole 4a and outlet hole 4b of the ball 4.
The fluid then passes through the polyethylene resin mesh tube 5a of the filter element 5, flows out of the filter element 5, flows over the outer peripheral surface of the ball 4, and flows onto the downstream outer peripheral surface of the ball 4. It flows out into the outlet channel 1a through the provided through hole 4d. Incidentally, since the fluid flowing on the outer peripheral surface of the ball 4 is sealed by the seat 6 attached to the union 2, the fluid flowing on the outer circumferential surface of the ball 4 is
It will not leak to the side.

On the other hand, if a large amount of foreign matter in the fluid is collected in the filter element 5 and the filter element 5 needs to be cleaned or replaced, rotate the handle 13 by 90 degrees. to close the ball 4 and open the inlet channel 2b.
- blocking the communication between the branch flow path 3a and the outlet flow path 1b;
Next, the lid 11 is removed from the branch pipe 3 and the filter element 5 is pulled out from the inside of the branch pipe 3.

FIG. 4 shows a ball valve with a strainer showing another embodiment. Since this is an improved type of FIG. 1, only the different points will be explained.

The opening area of the outlet hole 40b of the ball 40 is approximately 1/2 that of the case shown in FIG. 1, and its cross section is semicircular as shown in FIG. The spherical portion of the ball 40 facing the outlet passageway, which faces the inlet passageway 40a, has a branch passageway and an outlet passageway in addition to the passageway 40d, which is the same notched groove as shown in FIG. A substantially L-shaped cutout through hole 40e for direct communication is provided. As can be seen from FIG. 4, the present embodiment is more effective than the embodiment shown in FIG.
Fluid pressure drop is extremely low.

The filter element 50 has an O-ring 80
The outlet hole 40b of the ball 40 is
, the cross section of the fitting portion is semicircular. The main body of the filter element 50 is formed into a circular cross-sectional shape with an enlarged diameter as in FIG. A socket 110a provided inside the lid 110 that is fitted
It is rotatably fixed via an O-ring 110b attached to the inner surface of the socket 110a.

Therefore, in the case of this embodiment, the handle 1
3 is rotated 90 degrees to close the ball 40,
The filter element 50 will also rotate 90 degrees accordingly.

A drain hole 110c is provided in the center of the lid 110, and a bolt 14 is screwed into the hole 110c.

When the bolt 14 is removed from the lid body 110, the fluid in the branch pipe 3 is released, and at the same time, the foreign matter in the fluid accumulated at the bottom of the filter element 50 is also discharged, and the foreign matter can be removed.

(Effects of the Invention) As explained above, the ball valve with a strainer according to the present invention has three functions, which are the primary valve, the strainer, and the secondary valve, which were conventionally required.
It is a highly functional valve with a simple structure that combines all functions in one valve. Therefore,
The flow of fluid can be closed on the spot by simply rotating the handle, and the filter element can be immediately removed without fluid leaking out, making operation extremely simple and greatly improving work efficiency. In addition, since the distance between the surfaces of the device itself can be reduced and the structure is simple, costs can be reduced, and the differential pressure between the upstream and downstream fluids can be arbitrarily reduced. There is.

[Brief explanation of the drawing]

1 is a longitudinal cross-sectional view showing one embodiment of the ball valve with a strainer of the present invention, FIG. 2 is a downstream side view of the ball in FIG. 1, and FIG. 3 is a view of the filter element in FIG. 1. FIG. 4 is a vertical sectional view showing another embodiment of the present invention, FIG. 5 is a downstream side view of the ball in FIG. 4, and FIG.
The figure is a bottom view of the ball. 1... Valve body, 2... Union, 3... Branch pipe, 4, 40... Ball, 5, 50... Filter element, 6, 7... Seat, 8, 80...
...O-ring, 9...Seal packing, 10...
Flat packing, 11,110...lid, 12...stem, 13...handle, 14...bolt.

Claims (1)

[Claims] 1. An inlet channel and an outlet channel that share an axis, a branch channel that intersects the channel in a T-shape, and a substantially L-shape that communicates the inlet channel and the branch channel. In a ball valve equipped with a ball having an inlet hole and an outlet hole connected to the mold, a cylindrical filter element is installed in the branch pipe forming the branch flow path, and one end thereof is connected to the ball. fitted into the end of the outlet hole of the branch pipe, the other end being fixed with a lid removably attached to the outer end attachment port of the branch pipe, and facing the inlet hole of the ball; A ball valve with a strainer, characterized in that a spherical portion facing the outlet flow path is provided with a through hole for guiding the fluid that has passed through the filter element to the outlet flow path. 2. Claim 1, characterized in that the cylindrical filter element fitted into the end of the outlet hole of the ball has a semicircular cross section at the fitting part. ball valve with strainer. 3. The ball valve with a strainer according to claim 1 or 2, characterized in that the lid body is provided with a drain.