JP2002267032A - Ball check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ball check valve which is very simple in structure of a valve body, easy in manufacture, small in parts number, easy in disassembly/ assembly, and excellent in fluid back-flow preventing performance. SOLUTION: An inflow port 6 opened downwardly at a lower end of the valve casing 2 having a valve chest 3 swollen in the transverse direction with an outline of elliptical shape long in the vertical direction and a center part thereof of the maximum diameter, and having the inside diameter larger than the diameter of a ball valve element 4 is provided, an outflow port 8 opened upwardly in an upper end of the valve casing 2 is provided, and a valve element receiving part 12 is formed of projecting and bent parts 11 and 11 projecting in the valve chest 3 with a constricted portion 10 provided on an upper part close to the outflow port 8 of the valve casing 2. The ball valve element 4 formed of elastic material such as rubber and resin is inserted from the inflow port 6, and stored in the valve chest 3 movably in the vertical direction and in the transverse direction, and a valve seat 14 is provided on an inner end part of a cylindrical body 5 tightly fitted to the inflow port 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball type check valve used for preventing backflow of a fluid in a vertical pipe.

[0002]

2. Description of the Related Art Conventionally, as a ball type check valve attached to a vertical pipe such as a discharge pipe of a pumping pump, for example, Japanese Unexamined Utility Model Publication No. 6-62274, Japanese Unexamined Patent Publication No. 9-28767.
No. 0 is known.

[0003]

However, all of the above-mentioned conventional ball check valves have a structure in which a ball valve body is retracted to a standby position provided in a valve box when a fluid is flowing. In addition, since the valve box is provided with an inspection port and a lid for sealing the inspection port is provided, the structure of the valve box becomes complicated and the number of parts is large.

The present invention has been made in view of the above circumstances, has a very simple structure of a valve box, is easy to manufacture and process, has a small number of parts, and can be easily disassembled and assembled. However, an object of the present invention is to provide a ball type check valve having excellent fluid backflow prevention performance.

[0005]

In order to achieve the above object, a ball check valve of the present invention has an elliptical shape whose outer shape is long in the vertical direction, and a central portion bulges in the horizontal direction with a maximum diameter. An inlet having a larger inner diameter than the diameter of the ball valve body is provided at a lower end of a valve box having a valve chamber having an opening, and an outlet is provided at an upper end of the valve box, and an outlet is provided at an upper end of the valve box. A valve body receiving portion is formed by a bent portion protruding into the valve chamber with a constricted portion provided in an upper portion near the outlet of the valve box, and a ball valve body made of an elastic material such as rubber or resin is provided. A valve seat is provided at an inner end portion of a cylindrical body which is inserted from an inlet and is movably accommodated in the valve chamber in a vertical direction and a lateral direction, and is closely fitted to the inlet.

[0006] The valve body receiving portion is formed by a pair of curved portions projecting in an arc shape opposite to each other into the valve chamber. It is preferable that a wide channel is provided, and the ball valve element is configured to be movably received in the lateral direction along the two bent portions.

[0007] Further, a pipe connection port is formed by a rear end protruding portion of the cylindrical body closely fitted to the inflow port, and a cylindrical section forming a pipe connection port is connected to the outflow port. In addition, when the outer diameter of the cylindrical body and the cylindrical portion is designed to the standard size of the pipe member, a commercially available pipe member can be directly fitted to the cylindrical body and the cylindrical portion to be easily assembled.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show an embodiment of a ball type check valve according to the present invention. The check valve 1 includes an elliptical valve box 2 having an external shape that is long in the vertical direction, and the valve box 2. A ball valve body 4 housed in the valve chamber 3 so as to be movable in the vertical and horizontal directions, and a cylindrical body 5 tightly fitted to an inflow port 6 described later to form a valve seat 14 of the ball valve body 4. It is configured.

The valve box 2 is formed in an elliptical shape from a hard resin material or a metal material such as cast iron or bronze, and the valve chamber 3 has a large volume with a central portion having a maximum diameter and swelling in the lateral direction. . The diameter of the central part of the valve chamber 3 is the diameter d of the ball valve body 4
Is designed to be about 1.5 times larger than
It is movably accommodated in the vertical and horizontal directions.

At the lower end of the valve box 2, a cylindrical inflow port 6 having an inner diameter D which is opened downward and is slightly larger than the diameter d of the ball valve element 4 is continuously provided. An annular recess 7 is provided for fitting the sealing ring 15 to be fitted. At the upper end of the valve box 2, an outlet 8 opening upward and a cylindrical portion 9 forming a connection port of a pipe are continuously provided. The inlet 6 and the outlet 8 are arranged on the same axis. Further, a pair of constricted portions 10 and 10 (see FIG. 2) diametrically opposed to each other are provided in an upper portion near the outlet 8 of the valve box 2 so as to be opposed to each other in the valve chamber 3 as shown in FIG. As a result, a pair of protruding portions 11, 11 protruding in an arc shape are formed, and a valve body receiving portion 12 for receiving the ball valve body 4 pushed up in the valve chamber 3 by the two protruding portions 11, 11 is formed. At the same time, a flow path 13 having a minimum width at the center position and gradually widening to both sides is provided between the two bent portions 11 and 11.

As described above, when the valve element receiving portion 12 is formed by the arc-shaped projecting portions 11, 11 opposed to each other, the ball valve element 4 received by the valve element receiving portion 12 makes the ball valve element 4 of the flow path 13. The ball valve 4 is moved to one side of the flow path 13 as shown by an imaginary line in FIG. And the flow path 13 can secure a large flow area, and clogging of foreign matter can be effectively prevented.

The ball valve body 4 is made of an elastic material such as rubber or resin, and is inserted into the valve chamber 3 from the inflow port 6 before the cylindrical body 5 is closely fitted to the inflow port 6, and is inserted into the valve chamber 3. It is housed in a floating state that is movable vertically and horizontally. In addition, the valve box 2 is not provided with an inspection work port for replacing the ball valve element 4 or performing an inspection or the like in the valve chamber 3 and a lid for sealing the work port. It has a simple structure.

The cylindrical body 5 is made of a pipe material having an outer shape substantially equal to the inner diameter D of the inflow port 6 to be closely fitted to the inflow port 6, and the inner end portion is chamfered to form a valve seat 14 of the ball valve body 4. Is provided. The cylindrical body 5 is shown in FIGS.
As shown in FIG. 2, the seal is tightly fitted to the inlet 6 via the seal ring 15 fitted in the annular recess 7 of the inlet 6.

In the illustrated embodiment, the cylindrical body 5 closely fitted to the inflow port 6 and the cylindrical portion 9 of the outflow port 8 have the same external dimensions, and are designed in accordance with the standard dimensions of the piping member. ing. Therefore, in the ball check valve 1 of the present invention having the above-described configuration, a commercially available piping member (not shown) is provided for the cylindrical body 5 on the inlet 6 side and the cylindrical portion 9 on the outlet 8 side, respectively. Just by directly fitting and connecting, it can be easily assembled to the vertical piping.

In the ball type check valve 1 having the above structure, the downwardly opening inflow port 6 is connected to, for example, a discharge pipe (not shown) of a submersible pump in a sewage treatment apparatus.
The cylindrical portion 9 of the outlet 8 opening upward is connected to a discharge pipe (not shown) for use.

The ball valve 4 is pushed up from the valve seat 14 under the pressure of the liquid flowing from the inlet 6 to open the inlet 6, and the ball valve 4 moves freely in the valve chamber 3. While moving upward while receiving the valve body 12 (11, 11).
It is received in contact with. However, the ball valve 4
Has a tendency to constantly move in the lateral direction along the two protruding portions 11 without stopping at the center position as described above. On the other hand, the liquid that has flowed into the valve chamber 3 from the inflow port 6 is discharged through the outflow port 8 and the cylindrical section 9 through the flow path 13 formed between the two bent portions 11. At this time, when a foreign matter such as a solid material flows into the valve chamber 3 together with the liquid, the ball valve element 4 moves the flow path 1 as shown by an imaginary line in FIG.
By moving to one side of 3 and securing a large flow area, foreign matter is discharged through the flow path 13 without any trouble.

When the inflow of the liquid from the inflow port 6 is stopped or weakened, the ball valve 4 descends in the valve chamber 3 under its own weight and the head pressure in the discharge pipe, and sits on the valve seat 14 to flow therethrough. The entrance 6 is closed. If the inflow of the liquid from the inlet 6 is suddenly stopped, a water hammer phenomenon may occur. However, the valve chamber 3 expands in the lateral direction and has a large volume. When the body 4 descends while floating in the valve chamber 3, the occurrence of water hammer can be suppressed.

It is possible to remove foreign substances clogged in the valve box 2,
When replacing the ball valve element 4, the cylindrical body 5 closely fitted to the inflow port 6 is pulled out, and the ball valve element 4 is inserted through the inflow port 6.
In addition, since a foreign substance clogged in the valve chamber 3 can be easily taken out, inspection and replacement work can be easily performed.

FIGS. 4 to 6 show another embodiment of the present invention. This embodiment differs from the previous embodiment only in that flanges 16 are provided at the inflow port 6 and the outflow port 8 of the valve box 2, and the other configuration is the same. And the description thereof is omitted. In the check valve 1 configured as described above, connecting a pipe member (not shown) to the inflow port 6 and the outflow port 8 via the flange 16 is the same as the ordinary pipe connection.

[0020]

As described above, according to the present invention,
Since the valve box is not provided with an inspection work port and a lid that seals the work port, the replacement work of the ball valve body and the check work in the valve chamber are performed through the inlet provided at the lower end of the valve box. Since the structure of the valve box is simple, the manufacturing process is easy, and the number of parts is small, it can be provided at low cost. Also, disassembly and inspection work can be performed easily. Further, since the valve box has an elliptical shape that is long in the vertical direction and has a large-sized valve chamber that expands in the horizontal direction, it is possible to suppress the occurrence of a water hammer when the fluid flows backward.

Further, according to the second aspect of the present invention, it is possible to secure a large flow passage area in the flow passage in the valve body receiving portion provided in the valve chamber, and to prevent clogging of foreign matters.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a ball check valve according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is a longitudinal sectional front view showing another embodiment of the ball type check valve according to the present invention.

FIG. 5 is a sectional view taken along the line 5-5 in FIG. 4;

FIG. 6 is a sectional view taken along line 6-6 in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ball type check valve 2 Valve box 3 Valve room 4 Ball valve element 5 Cylindrical body 6 Inlet 7 Annular concave part 8 Outlet 9 Cylindrical part 10 Constriction part 11 Protrusion part 12 Valve body receiving part 13 Flow path 14 Valve seat 15 Seal ring

Claims (3)

[Claims] 1. An inner diameter larger than the diameter of a ball valve body which is open downward at the lower end of a valve box having a valve chamber having a maximum diameter and having a valve chamber bulging in the horizontal direction with an outer shape having an elliptical shape elongated in a vertical direction. Is provided, and an outlet opening upward is provided at the upper end of the valve box, and further, a constricted portion is provided at an upper portion of the valve box close to the outlet, and the valve box projects into the valve chamber. A valve body receiving portion is formed by the protruding portion, and a ball valve body made of an elastic material such as rubber or resin is inserted from the inflow port and housed in the valve chamber so as to be movable vertically and horizontally. A ball check valve, wherein a valve seat is provided at an inner end portion of a cylindrical body closely fitted to the inflow port. 2. The valve body receiving portion is formed by a pair of protruding portions projecting in an arc shape opposite to each other into the valve chamber. 2. A ball check valve according to claim 1, wherein a flow path gradually increasing in width is provided, and the ball valve body is configured to be movably received in the lateral direction along the two bent portions. . 3. A connection port of a pipe is formed by a rear end protruding portion of the cylindrical body closely fitted to the inflow port, and a cylindrical section forming a connection port of the pipe is connected to the outflow port. 1
Or the ball type check valve according to 2.