JPS629072A - Ball valve with strainer - Google Patents

Abstract

PURPOSE:To enable a single valve to serve also for use functioning as a primary side valve, strainer and a secondary side valve, by mounting a filter element to inside a branch pipe of the ball valve. CONSTITUTION:A ball valve, mounting a cylindrical filter element 5 in a branch pipe 3 forming a branch flow line 3a, fits one end part of said element 5 to the outlet through hole end of a ball 4 while fixes the other end part by a cover member 11. While the ball valve provides a through hole 4d, which introduces fluid, passing through the filter element 5, to an outlet flow line 1a, in a spherical part facing to the outlet flow line 1a mutually opposed to an inlet through hole of the ball 4. By this constitution, the ball valve enables a single valve to serve also for use functioning as a primary side valve, strainer and a secondary side valve.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a ball valve with a strainer. This invention relates to a ball valve with a strainer.

(Prior art) Strainers, which are conventionally installed in front of pulp and circulation pumps and used for the purpose of removing earth and sand and iron scraps in 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 pulp on the upstream side must first be blocked to prevent fluid from flowing out, and the pulp must be placed in a remote location. If it is in
It was very troublesome and there was a lot of fluid leakage. Also,
If there is no pulp on the downstream side of the strainer, there is a problem in that when the filter element is removed, the downstream fluid flows out. Therefore, in order to prevent the fluid from flowing out when removing the filter element, K had to provide a total of three devices, each requiring pulp before and after the strainer.

As a solution to these problems, a strainer with a fluid outflow prevention device is disclosed in Japanese Utility Model Publication No. 56-20020. The strainer has a branch pipe diagonally installed at an appropriate location on the side of the main pipe, a filter cylinder is provided inside the branch pipe, and the primary flow path of the main pipe is closed when the seed part inside the branch pipe is removed. A check valve is installed in the secondary flow path of the main pipe.

In other words, when the filter tube in the branch pipe is removed, the valves and reverse valves provided on the primary and secondary sides of the main pipe operate, allowing fluid from the upstream and downstream sides to flow into the branch pipe. This prevents

(Problems to be Solved by the Invention) However, the above strainer has the following problems. That is, although the strainer has only one device, it essentially consists of a pulp +- cylinder,
It consists of two devices: pulp and pulp).
Valves and check valves must be installed in the primary and secondary flow paths of the main pipe, resulting in a complex structure, a large number of parts, time-consuming assembly, and high manufacturing costs. It gets expensive.

In addition, the valve or check valve may be blocked by foreign matter in the fluid)
If the filter malfunctions, it will cause a malfunction.If the filter cylinder is removed, the fluid on the upstream or downstream side will flow out, and in some cases, the flow of fluid cannot be closed. It may be necessary to visit the site to freeze the pulp.

Furthermore, since the valve and the reverse valve are installed in the flow path, fluid resistance increases. That is, the 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 structure consisting essentially of a single VC device, which prevents fluid from flowing out when the filter element is removed. To easily provide a ball valve with a strainer.

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

That is, the measures taken to solve the problems of the present invention include an inlet channel and an outlet optical path that share an axis, a branch channel that intersects the channel in a T-shape, and a branch channel that intersects with the channel in a T-shape. In a ball valve that includes a ball inside that has an inlet hole and an outlet hole connected in an abbreviated shape to communicate with a flow path, a cylindrical filter element is installed in a branch pipe forming the branch flow path. one end of which is fitted into the end of the outlet hole of the ball, and the other end is fixed with a lid detachably attached to the outer end attachment port of the branch pipe;
Further, a spherical portion facing the outlet passageway opposite to the inlet passageway of the ball is provided with a through hole that guides the fluid that has passed through the filter element to the outlet passageway. .

The ball valve, which forms 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 either a type in which a union or a ball holder that clamps the ball via a sheet is attached to the pulp body from both sides or one side, or a type in which the attached state is simply an insertion 1 adhesive or screw attachment. Well, 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 fitted into the end of an outlet hole of a ball having an abbreviated hole. The method of fitting the filter element to the end of the nuclear outlet hole is not particularly limited, but for example, the outer peripheral end KO-! There is a method in which a filter element with a J-ring attached is inserted into the end of the outlet hole, and an annular notch groove is provided at the end of the outlet hole, and a 0- Examples include a method of fitting a filter element with a ring attached thereto. 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 to a lid removably attached to the outer end attachment port of the branch pipe.

#The filter element is composed of a substantially cylindrical mesh filter tube and a reinforcing tube that has a large number of holes arranged around its outer periphery or has a lattice-like frame, and both ends of the mesh filter 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 function of filtering foreign matter in the flow path. .

Suitable materials for the mesh-shaped recesses that serve as a filter include metals, plastics such as polyolefin resins, polyamide resins, and polyester resins, and composites thereof, but are not limited to these. isn't it.

In addition, the mesh may vary depending on the size of foreign objects in the fluid.
It can be selected freely.

One end of the filter element is open because it must communicate with the outlet hole of the ball, but the other end, which is fixed to the lid, must be closed. The closing method includes υ, in which the other end of the filter element is attached to a socket provided inside the lid;
There is a method of closing the filter element by attaching a flat gasket to the inside of the lid and holding the other end of the filter element together with the lid, but it is also possible to close the opening at the other end of the filter element and fix the filter element. Any method is fine.

Further, the lid body may be provided with a drain outlet for removing foreign matter in the fluid trapped 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 cock method. Note that in order to reduce the loss of fluid pressure on the upstream and downstream sides, it is better to provide the branch pipe with as large a diameter and length as possible.

The ball, which is rotatably mounted inside the ball valve body, has an inlet passage hole and an outlet passage hole that are connected in an abbreviated shape that communicates the inlet passage and the branch passage 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 through hole is provided in the spherical portion of the ball facing the outlet passage, which faces the inlet passage, for guiding the fluid that has passed through the cylindrical filter element to the outlet passage. 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 portion. Furthermore, it is preferable to provide a notch in which the spherical surface located downstream of the portion in contact with the sheet is cut out in a direction perpendicular to the axis of the flow path to reduce 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.

(Function) When the handle engaged with the ball is rotated through the stem], when the ball is rotated and the inlet flow path of the valve body and the branch flow path are communicated, the fluid on the upstream side flows through the inlet. From the flow path, it flows into the branch flow path via an abbreviated hole inside the ball. The fluid that has flowed into the branch flow path is
It passes through the mesh-shaped recessed part of the filter element, and flows out into the outlet passage through a running hole provided in the spherical part of the ball facing the outlet passage of the pulp body.

A seal ring attached to the filter element seals the space between the filter element and the end of the outlet hole of the ball, so that fluid flowing through the abbreviated hole in the ball can pass through the filter. Direct leakage to the outside of the element is prevented.

The foreign matter in the fluid inside the branch flow path is separated by the mesh-like recessed part of the filter element, and either adheres to the filter cylinder 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-shaped recessed part of the filter element and cleaning is required, or
If the filter element becomes damaged and needs to be replaced, rotating the handle moves the filter element to the closed position, i.e., the inlet flow path, branch flow path, and branch flow path of the pulp body are moved. The communication between the outlet flow path and the outlet flow path is cut off, and then the lid body, which is removably attached to the outer end attachment port of the branch pipe and which fixes the filter element, is removed from the branch pipe. All you have to do is remove 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. , pipe connection part 2a and flow path (inlet flow path in the figure, hereinafter referred to as inlet flow path) 21
) is inserted and adhered to the pulp body, and a branch pipe 3 forming a branch channel 3a orthogonal to both channels in a T-shape is integrally provided.

4 is a ball rotatably supported in the internal central valve chamber of the pulp body 1. The ball 4 includes a sheet 6 attached to the side of the union 2 facing the ball 4, and a sheet 7 attached to the side of the pulp body 1 facing the ball 4.
It is held between. Inside the ball 4, there is an inlet passage hole 4a that communicates with the inlet flow path 2b, an outlet hole 4b that communicates with the branch flow path 3a, and an outlet hole 4b that communicates with the branch flow path 3a. An annular notch groove 4a is provided at the end of 413.
is provided. The spherical portion facing the outlet flow path, which faces the inlet passage hole 4a, is cut out in a direction perpendicular to the flow path axis.

The fluid flowing into the branch flow path 5a is directed to the exit optical path 1b.
A through hole 4d that is perpendicular to the other direction is cut out. (
(See FIG. 2) Reference numeral 5 denotes a cylindrical filter element that is installed in the branch pipe 3 and forms a strainer together with the branch pipe 3 and a lid 11 to be described later.

The filter element 5 includes a cylindrical filter tube 5a made of mesh-like polyethylene resin, and is arranged around the outer periphery of the filter tube 5a.
It consists of a lattice-shaped reinforcing cylinder 5) made of hard vinyl chloride to which the filter cylinder 5a is fixed. (See Figure 3) The upper end of the filter element 5 is open,
An annular groove 5cK provided on the outer periphery of the upper end of the reinforcing tube 5b
It is fitted into the annular notched groove 4c of the ball 4 via the Q-+7 ring 8 mounted thereon. On the other hand, the lower end of the filter element 5 is fitted with a seal gasket 9 fitted into a swivel of a flange 5d provided on the outer periphery of the reinforcing cylinder 5b, and a circular flat gasket 10 is brought into contact with the lower end to open the lower end. The outer end (lower end in the figure) is fixed by a lid body 11 screwed onto the outer periphery of the mounting opening 3b.

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, when the handle 13 is rotated to open the strainer ball 4, the fluid flowing from the upstream pipeline passes through the inlet channel 2b formed by the union 2, The branch flow path 3a passes through the inlet hole 4a and the outlet hole 4t of the ball 4.
flows into. The fluid is then passed through the filter element 5
is filtered through the polyethylene resin mesh filter cylinder 5aK, flows out of the filter element 5, flows on the outer peripheral surface of the ball 4, and passes through the through hole 4d provided on the downstream outer peripheral surface of the ball 4. It flows out into the drainage flow path 1a. Note that the fluid flowing on the outer peripheral surface of the ball 4 is sealed by the seat 6 attached to the union 2r/C, so that it does not flow out of the inlet channel 2b@Ki.

On the other hand, if a large amount of foreign matter in the fluid is collected in the filter element 5 due to filtration and the filter element 5 needs to be cleaned or replaced, the handle 13 should be rotated 90 degrees. Then, the ball 4 is closed, and the communication between the inlet channel 2b, the branch channel 3a, and the outlet channel 1b is cut off.Then, the lid body 11 is removed from the branch pipe 3, and the filter element 5 is inserted into the branch pipe 3. Just pull it out from inside.

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.

As in the case of FIG. 1, the outlet hole 40'b of the ball 40 has a vertical opening area, and has a semicircular cross section as shown in FIG.

The spherical part of the ball 40 facing the outlet passageway, which faces the inlet passageway 40a, has a passageway 40 (l) consisting of the same notched groove as shown in FIG. A through hole 40e cut out in the shape of a square is provided to allow direct communication between the channels.As can be seen from FIG. It has become less.

The filter element 5o is fitted into the outlet hole 4°1)K of the ball 4o with an O-ring 8° interposed therebetween, so that the fitting portion has a semicircular cross section.

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
, an O-ring 11 attached to the inner surface of the socket 110a
It is rotatably fixed via 0'b.

Therefore, in the case of this embodiment, the handle 13 is
When the ball 4o is brought into a closed state by 0 rotation, the filter element 5o is also rotated by 90 degrees accordingly.

A drain hole 110c is provided in the center of the lid 110.
are provided and bolts 14 are screwed together.

When the bolt 14 is removed from the lid 11Q, the fluid inside the limb tube 5 is released and at the same time, the filter element 50
Foreign matter in the fluid that has accumulated at the bottom of the tank is also released, allowing the foreign matter to be removed.

(Effects of the Invention) As explained above, the ball valve with a strainer according to the present invention has a structure in which one pulp has all the five functions of primary pulp, strainer, and secondary pulp that were conventionally required. It is a highly functional pulp that can be easily produced. 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 flowing out, making the operation extremely simple and greatly improving work efficiency. In addition, the distance between the surfaces of the device itself can be shortened and the structure is simple, so costs can be reduced.Furthermore, the differential pressure between the upstream and downstream fluids can be made arbitrarily small. ing.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal 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. 4 is a longitudinal sectional view showing another embodiment of the present invention, FIG. 5 is a downstream side view of the ball in FIG. 4, and FIG. 6 is a bottom view of the ball. 1...Pulp body, 2...Union, 3...Branch pipe, 4.40...Ho k, 5, 5Q...Filter element, 6,7...C), 8.80 ...
0-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 an approximately L that communicates the inlet channel and the branch channel. In a ball valve equipped with a ball having an inlet passage hole and an outlet passage connected in the shape of a letter, a cylindrical filter element is installed in the branch pipe forming the branch flow path, and one end thereof is attached to the branch pipe forming the branch passage. is fitted into the end of the outlet hole of the ball, and the other end is fixed with a lid detachably attached to the outer end attachment port of the branch pipe,
Further, a strainer is provided, wherein a spherical portion facing the outlet flow path, which is opposite to the inlet hole of the ball, is provided with a through hole that guides the fluid that has passed through the filter element to the outlet flow path. Ball valve. 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 claims 1 and 2, characterized in that the lid body is provided with a drain.