JP2949340B2 - Ball valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a ball valve having a built-in strainer capable of removing impurities and the like contained in a flowing fluid.

[0002]

2. Description of the Related Art Conventionally, as this type of ball valve, for example, there is one as shown in FIG.

[0003] That is, this conventional one is a flow path of a valve body 1d.
A pair of ball seats 8b is mounted on the inner peripheral surface of 2a, and a ball 9a having a through hole 10a is provided between the ball seats 8b.
Is provided with a strainer 12a which is rotatably interposed and which has an opening 13a in the through hole 10a, in order to prevent the strainer 12a from coming off. A C-shaped retaining ring 27 is fitted in the concave groove 26 formed on the surface, and the opening of the strainer 12a when the valve is closed.
A strainer attachment / detachment hole (not shown) is formed in a side wall of the valve body 1d opposed to 13a.

[0004]

However, the above-mentioned conventional ball valve employs a C-shaped retaining ring 27 which fits into the concave groove 26 of the through hole 10a as means for preventing the strainer 12a from coming off. Requires a special tool and is very troublesome in terms of work, which is one of the factors that complicates the attachment / detachment work of the strainer 12a.

Therefore, the present invention has been made to solve the above-mentioned conventional problems, and simplifies the work of attaching and detaching the strainer, and reliably prevents the strainer from coming off when the valve is opened. It is an object to reduce the number of parts.

[0006]

Means for solving the above problems, ie, the means adopted by the present invention for solving the above-mentioned problems are the tapered surfaces of a pair of ball seats 8, 8 mounted on the inner peripheral surface of the flow path 2 of the valve body 1. 8a, 8
between a, together with the ball 9 having a through hole 10 is interposed rotatably, through hole 10 by the rotation operation of the ball 9 is the flow passage 2
Captures contaminants in the flowing fluid when the valve is opened
The strainer 12 has an opening 13 in the through hole 10 of the ball 9 to prevent the ball 9 from separating from the through hole 10
When the valve is closed , a strainer is provided on the side wall of the valve body 1 facing the opening 13 of the strainer 12.
In a ball valve having a strainer attaching / detaching hole 15 for attaching / detaching the opening 12, a cylindrical shape forming the opening 13 is provided.
The outer diameter of the outer peripheral surface of the body 12b is substantially equal to the inner diameter of the through hole 10.
And a flange portion 14 having a predetermined width in the axial direction of the through hole 10.
The outer diameter of the flange portion 14 is set to the ball seat.
By setting the diameter larger than the inner diameter of 8, the ball seat
8 is used as the separation prevention means .

Accordingly, in the case of mounting the strainer 12 in the ball valve characterized by the above-mentioned features of the present invention, the valve is first closed and the strainer 12 is mounted in the through hole 10 of the ball 9 through the strainer attaching / detaching hole 15. When the ball 9 is rotated in this state, the opening 13 of the strainer 12
Is dimensioned so as to be able to engage with one of the ball seats 8, so that the strainer 12 is prevented from coming off from the through hole 10, while the through hole 10 communicates with the flow path 2 of the valve body 1. Then, the fluid flows.

When the fluid passes through the strainer 12, impurities and the like contained in the fluid are removed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a valve body in which a flow path 2 is formed in a pipe axis direction. The valve body 1 has a body 1a in which a valve chamber 3 is formed in the flow path 2; The ball holding portion 1b is screwed to the screw portion 1c at one end of 1a via an O-ring 4. The ball holding portion 1b and the inner peripheral surface at the other end of the body portion 1a have screw portions 5,
6 are formed respectively.

Reference numeral 7 denotes a mounting hole formed in the other end of the body portion 1a in the radial direction, which is normally closed. If necessary, a pressure gauge or the like is mounted via a screw portion 7a provided at both ends. Can be

Reference numeral 8 denotes a pair of ball seats mounted on the inner peripheral surface of the other end side of the body portion 1a and the ball retainer 1b, and a tapered surface 8a whose diameter increases toward the end portion is formed on the inner peripheral surface inside the pair. , Synthetic resin and the like.

Reference numeral 9 denotes a ball rotatably interposed between the ball seats 8. An annular convex portion 11 is provided at one end of the inner peripheral surface of the through hole 10.
Is protruding.

[0014] 12 is a strainer mounted on the through hole 10 of the ball 9 is fixed to one end and a basket-like mesh body 12a and consists of a cylindrical body 12b that forms the opening 13, the through the strainer 12 When installed in the hole 10 , the cylindrical body
A flange 14 provided on the outer peripheral surface of 12b and an annular convex portion of the ball 9
The outer diameter of the flange portion 14 is made substantially coincident with the inner diameter of the small-diameter portion 10a of the through-hole 10 so that a gap 15 is formed between the 11. Therefore, when the normal strainer 12 is attached to the through hole 10,
The tip of the flange portion 14 of the strainer 12 projects slightly from the through hole 10 to the outside, or is flush with the other end. Moreover, the collar 14 is
The flange 14 (through hole 10) has a predetermined width in the axial direction.
The predetermined width is, for example, as shown in FIG.
Corner 14a of one end face of flange 14 in the center cross section of portion 14
And the length of the diagonal line between the other end surface and the corner portion 14b is
The width that is longer than the diameter. The outer diameter of the flange 14 is set to be larger than the inner diameter of the ball seat 8 so that the flange 14 can be engaged with the ball seat 8 when the ball 9 rotates. .

In FIG. 1 (a) showing the valve closed state, a strainer attaching / detaching hole formed in the side wall of the body 1a of the valve body 1 facing the opening 13 of the strainer 12 is shown.
The inner diameter is set so that is removable.

Reference numeral 16 denotes a cap screwed into a screw portion 15a formed on the inner peripheral surface of the strainer attaching / detaching hole 15, and reference numeral 18 denotes an O-ring for sealing.

Reference numeral 19 denotes a cylindrical mounting seat protruding from the side wall of the body of the valve body 1. A stem 20 protruding from the outer peripheral surface of the ball 9 is rotatably slidably mounted on the mounting seat 19. A handle 22 is fixed to a tip of the stem 20 via a mounting member 21 by a set screw 23, and the ball 9 can be opened and closed by rotating the handle 22. Reference numeral 24 denotes a pair of O-rings provided to seal between the mounting seat 19 and the stem 20.

In the present embodiment, the ball valve has the above-mentioned specific items. If the strainer 12 is inserted into and removed from the through hole 10 of the ball 9 through the strainer attaching / detaching hole 15, the strainer
Since 12 can be mounted and demounted, there is an advantage that it can be performed very simply and quickly.

Such a ball valve is used by screwing the threaded portions 5, 6 of the valve body 1 to various pipes A as shown in FIG.

Then, the handle 22 is rotated to connect the through hole 10 of the ball 9 to the passage 2 of the valve body 1 as shown in FIG. 2. At this time, the flange 14 of the strainer 12 is connected to one of the balls. Since the seat 8 rotates while sliding on the tapered surface 8a of the seat 8, even if the flange 14 of the strainer 8 is mounted so as to slightly protrude from the through hole 10, the edge of the flange 14 is There is an advantage that the strainer 12 is corrected to a normal mounting position by receiving the pressing force by the tapered surface 8a.

Further, since the outer diameter of the flange portion 14 of the strainer 12 is set to be larger than the inner diameter of the ball seat 8, when the ball 9 rotates and when the valve shown in FIG. In this case, the strainer 12 does not come off from the through hole 10 of the ball 9.

The flowing fluid flows into the passage 2 from the body 1a side of the valve body 1. The passage 2 has a strainer.
Since the network 12 is disposed, foreign substances and the like in the flowing fluid are trapped by the mesh body 12a, and thus the flowing fluid from which the foreign substances and the like have been removed is transferred to the ball presser 1b of the valve body 1 by the ball presser 1b.
Will be spilled from.

When the valve is opened, the flange 14 of the strainer 12 moves toward the gap 15 by receiving the water pressure of the flowing fluid and engages with the annular projection 11 of the ball 9, so that further movement is prevented. Is done.

Also, when the valve is changed from the valve-open state to the valve-closed state, there is a possibility that the strainer 12 is displaced by the hydraulic pressure of the flowing fluid. Since the flange 14 contacts the tapered surface 8a of the ball seat 8, the strainer 12 is corrected to a normal mounting position. Therefore, when the strainer 12 is washed or replaced, the strainer 12 can be easily detached from the through hole 10 of the ball 9.

Further, since a space 24 is formed between the mesh member 12a of the strainer 12 and the through hole 10 of the ball 9, even if impurities or the like adhere to the tip of the mesh member 12a and are blocked,
There is an advantage that an outflow path for the flowing fluid from the side of the mesh body 12a through the space 25 is ensured.

The specific design items such as the shape of the valve body 1 and the strainer 12 in the above embodiment can be freely changed within the intended range of the present invention.

[0027]

As described above, according to the present invention, in order to use the ball seat on which the ball is rotatably interposed as a means for preventing the strainer from coming off, a C-shaped retaining ring is formed in the through hole of the ball. Compared to a conventional ball valve fitted in a groove, the strainer can be attached and detached more easily and quickly. Moreover,
When the valve is open, the flange of the strainer
Rotation while sliding on the paper surface.
It seems that the collar of the
Even in this case, the edge of the flange is pressed by the tapered surface.
Under the force, the strainer is corrected to the correct mounting position
The advantage is that

Further, since the number of parts is reduced as compared with the conventional case, there is also an effect that the overall configuration can be simplified.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a ball valve according to the present invention,
(A) is a front sectional view, and (B) is a side half sectional view.

FIG. 2 is a front sectional view showing the same use state.

FIG. 3 is a front sectional view of a conventional ball valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Valve body 2 ... Passage 8 ... Ball seat 9 ... Ball 10 ... Through hole 12 ... Strainer 13 ... Opening 15 ... Strainer attaching / detaching hole

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16K 5/06-5/08 F16K 51/00

Claims (1)

(57) [Claims] 1. A tapered surface (8a, 8a) of a pair of ball seats (8, 8) mounted on an inner peripheral surface of a flow path (2) of a valve body (1).
A ball (9) having a through-hole (10) is rotatably interposed, and the through-hole (10) is caused to flow by a rotation operation of the ball (9).
The contaminants in the flowing fluid when the valve connected to (2) is open
In order to capture, opening the through hole (10) of the ball (9) (13) strainer (12) having a through hole (10) or by release preventing unit
The valve body (1) , which is prevented from detaching from the valve body , and further faces the opening (13) of the strainer (12) when the valve is closed.
The side walls of the, in the ball valve storage <br/> toner removable hole for attaching and detaching the strainer (12) (15) is formed by opening the front
On the outer peripheral surface of the cylindrical body (12b) forming the opening (13),
An outer diameter substantially matching the inner diameter of the through hole (10) and the through hole (10)
A flange (14) having a predetermined width in the axial direction of the
The outer diameter of the flange (14) is determined by the inner diameter of the ball seat (8).
By setting the ball seat to a larger diameter, the ball seat (8)
A ball valve characterized in that it serves as a separation preventing means .