JP2001208222A - Ball valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a production cost, easily, quickly set a ball into a valve body, and release the pressure within a pipe even if abnormal pressure is generated in the valve body. SOLUTION: This ball valve comprises the valve body 2, the ball 3 having a through-hole 14 for adjusting a flow rate, a primary side valve seat assembly 4 having an inclined surface 25 and a coned disc springs 19, 20, a secondary side valve seat assembly 5, a cover 6, an operation means 7 for operating the ball, and a back sheet 27 having an inclined surface 29. When the primary side valve seat assembly 5, the ball 3, and the secondary side valve seat assembly 5 are mounted on the valve body 2, the inclined surface 25 is slid along the inclined surface 29 of the back seat 27 installed within the valve body 2 for mounting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe for transferring and controlling various fluids in various chemical plants, water treatment plants, nuclear power plants, and various factories and facilities. It relates to a ball valve to be adjusted.

[0002]

2. Description of the Related Art Generally, in a ball valve, a ball having a through hole is mounted in a valve body, and the ball is externally operated by an operation lever to adjust an opening of the ball through hole with respect to a fluid passage of the valve body. Thus, the flow rate is controlled.

In a conventional ball valve as shown in FIG. 9, for example, a primary fluid passage 10 of a valve body 101 is provided.
The inner end surface 103 of the second and the inner end surface (not shown) of the secondary fluid passage 104 are formed obliquely. Each inner end face 103
Is formed obliquely, the opening area of the opening 105 at the center of the valve body can be made larger than that of a conventional ball valve.

[0004] Therefore, in this ball valve, the ball 107 together with the first valve seat assembly 106 and the secondary valve seat assembly (not shown) is inserted into the opening 105.
Therefore, it can be more smoothly mounted in the valve body 101.

[0005] Also, the primary valve seat assembly 106,
Secondary side valve seat assembly (not shown), ball 107
Is removed from the valve body 101, and the valve body 101 is removed.
When inspecting or cleaning the inside of the device, the opening 105 is formed widely, so that the inspection and cleaning work can be easily performed.

[0006]

Although the ball valve has many advantages as described above, in order to widen the opening 105, the inner end face 10 of the primary fluid passage 102 is required.
The inner end faces (not shown) of the third and secondary fluid passages 104 have to be formed obliquely.

Therefore, the primary valve seat assembly 10
When the valve seat 6 and the secondary valve seat assembly (not shown) are mounted together with the ball 107 through the opening 105 into the valve body 101, the primary valve seat assembly 106 and the secondary valve seat assembly (not shown) are connected. , Each inner end face 10
3 and is mounted in a state of being inclined in an inverted C-shape. Therefore, in order for the both end surfaces 110 (one side not shown) of the ball 107 to be in contact with the slanted primary side valve seat assembly 106 and the secondary side valve seat assembly, both end surfaces 110 of the ball 107 are also required. It had to be formed diagonally.

Therefore, in manufacturing the above-mentioned ball valve, there is a problem that it takes time and labor to obliquely process the inner ends of the ball 107 and the primary fluid passage 102 and the secondary fluid passage 104, and the production cost is increased. Was.

[0009] The present invention has been developed in view of the above points, and its object is to reduce the manufacturing cost and to easily and quickly incorporate the ball into the valve body. It is another object of the present invention to provide a ball valve capable of releasing pressure into piping even if abnormal pressure rise occurs in the valve body.

In order to effectively achieve the above object, the present invention has the following configuration. That is, the ball valve according to the first aspect of the present invention includes the primary fluid passage and the second fluid passage.
A valve body having an opening at a position orthogonal to a fluid passage having a secondary fluid passage; a ball having a through hole to be mounted in the fluid passage of the valve body to adjust the flow rate; A primary side valve seat assembly and a secondary side valve seat assembly which are disposed at both ends of the hole and are mounted in the fluid passage of the valve body; a lid detachably provided at an opening of the valve body; An end face of a primary fluid passage facing the primary valve seat assembly and a secondary fluid facing the secondary valve seat assembly, the ball valve comprising an operating means provided on the lid to operate the ball. The end face of the passage is formed so as to be parallel and perpendicular to the fluid passage, and both end faces of the ball which are both ends of the through hole are formed in parallel, and the primary side of the primary side valve seat assembly is formed. Fluid flow An end surface facing the bottom side is inclined toward the ball as it goes to the bottom side, and communicates with the fluid passage between the primary valve seat assembly and the primary fluid passage. A backsheet is provided in which an inclined surface that contacts the inclined surface of the seat assembly is formed on one surface, and a backsheet that is formed so that the other surface is in contact with the end surface of the primary fluid passage in parallel. It is.

The ball valve of the present invention according to claim 2 is
2. The primary valve seat assembly according to claim 1, wherein the primary valve seat assembly comprises a primary valve seat, a disc spring, a ring, and a primary ball seat that contacts the ball. Is an inclined surface that is in contact with the inclined surface of the back sheet.

[0012]

1 to 8 show an embodiment of the present invention.
It will be described based on. FIG. 1 is a sectional view of a ball valve of the present invention, FIG. 2 is an explanatory view of a main part of an operating means, FIG. 3 is an exploded sectional view of a primary valve seat assembly, and FIG. FIG. 5 is an exploded cross-sectional view of a side valve seat assembly, FIG. 5 is an exploded cross-sectional view showing a main part of a ball valve of the present invention, FIG. 6 is a perspective view of a valve body as viewed from an opening, and FIG. FIG. 8 is a perspective view of a manual ball valve according to an example of the present invention, and FIG. 8 is a perspective view of an automatic ball valve according to an example of the present invention.

As shown in FIGS. 1 to 7, reference numeral 1 denotes an example of a manually operated ball valve according to the present invention, which includes a valve body 2, a ball 3, a primary valve seat assembly 4, and a secondary valve seat. It comprises a side valve seat assembly 5, a lid 6, operating means 7, a bolt 12 for fixing the lid 6 to the valve body 2, and a back seat 27.

More specifically, the valve body 2 (see FIGS. 1 and 5) corresponds to a primary fluid passage 8 and a downstream passage which correspond to an upstream passage of a fluid flowing into the valve body 2. A cylindrical fluid passage 10 comprising a secondary fluid passage 9; a primary fluid passage 8 and a secondary fluid passage 9;
And an opening 11 formed on one side in a direction orthogonal to the fluid passage 10.

An end face 8a of the opposed primary fluid passage 8;
The end face 9 a of the secondary fluid passage 9 is formed so as to be orthogonal to the fluid passage 10. Also, the valve body 2
The upper portion of the opening 11 is formed in a concave shape, and the lid 6 can be detachably engaged with the concave portion 11a.
A plurality of screw holes 13 (see FIG. 6) are formed around the opening 11 of the valve body 2 so that the lid 6 can be fixed to the valve body 2 by bolts 12 (or screws).

The ball 3 (see FIGS. 1, 5, and 6)
Is formed by processing a sphere having a size that can be inserted into the valve body 2 from the opening 11. That is, ball 3
Has a through-hole 14 having the same diameter as the primary fluid passage 8 and the secondary fluid passage 9 in the center. Both end surfaces 15, 16 of the ball 3 located at both ends of the through hole 14 are formed so as to be parallel. Furthermore, on the outer peripheral surface of the ball 3,
A stem groove 17 for engaging a distal end portion 41a of a stem 41 of the operating means 7 described later is formed.

The primary valve seat assembly 4 (FIG. 1,
3) includes a primary valve seat 18, disc springs 19 and 20, a ring 21, and a primary ball seat 22 in contact with the ball 3.

The primary valve seat 18 includes two disc springs 19, 2
0, a ring 21 and a circular concave portion 23 capable of accommodating the primary ball seat 22, and a through hole 24 having the same shape as the primary fluid passage 8 and the secondary fluid passage 9. The inner diameter of the concave portion 23 is formed to be larger than the diameter of the through hole 24.

Further, the end face 18a of the primary valve seat 18 which faces the end face 8a of the primary fluid passage 8 via the back seat 27 moves toward the inner bottom 2a of the valve body 2 as the valve body 2 moves. An inclined surface 25 is formed so as to be inclined toward the ball 3 (see FIG. 5) inserted into the inside 2.

In the recess 23 of the primary valve seat 18 described above,
The two disc springs 19 and 20, the ring 21, and the primary ball seat 22 are assembled in this order.

The two disc springs 19 and 20 are arranged symmetrically as shown in the figure and incorporated in the recess 23 of the primary valve seat 18.

The ring 21 has a hole 21 having the same diameter as the through hole 24.
a. The primary side ball sheet 22 is formed in a mortar shape on one side so that the ball 3 can be held by contacting the end surface 15 of the ball 3 (see FIG. 5). A hole 26 having the same inner diameter as 24 is formed.

The above-mentioned primary valve seat assembly 4 and 1
A back sheet 27 is interposed between the secondary fluid passage 8 (see FIGS. 1 and 5). This back sheet 27
The primary valve seat 18 has a hole 28 having the same diameter as the secondary fluid passage 8, the surface that contacts the inclined surface 25 of the primary valve seat 18 is defined as an inclined surface 29, and the end surface 30 that contacts the primary fluid passage 8 is a vertical surface. It is formed. When the back seat 27 is provided in the valve main body 2, the inclined surface 29 is formed so as to be enlarged and inclined from an upper portion to a lower portion.

The inclined surface 29 of the back sheet 27, 1
When the inclined surface 25 of the secondary valve seat 18 comes into contact, 1
The secondary valve seat assembly 4 is provided on the inner bottom 2 of the valve body 2.
It is mounted in the valve body 2 at right angles without tilting with respect to a.

Next, the secondary valve seat assembly 5 (FIG. 4,
FIGS. 1 and 5) show a secondary fluid passage 9 of the valve body 2.
And the ball 3, and comprises a seat retainer 31 and a secondary ball seat 32.

The seat retainer 31 is connected to the secondary fluid passage 9.
A hole 33 having a larger diameter and substantially the same diameter as the outer diameter of the secondary ball seat 32 is provided.
A stepped portion 34 is formed so as to be able to store and lock 2.
The diameter of the step portion 34 is larger than the diameter of the hole 33.

The secondary-side ball seat 32 has a hole 35 having the same diameter as the secondary-side fluid passage 9 and is formed in a mortar shape on one side so that the ball 3 can be engaged and held.

The lid 6 (see FIGS. 1, 2, 6, and 7)
The operating means mounting portion 36 has a shape which can be detachably engaged with the concave portion 11a of the valve body 2 and has a through hole 36b formed at the center, and the bolt 12 is inserted around the operating means mounting portion 36. Hole 37 is formed. The locking means 3 is provided inside the operation means mounting part 36 near the rear surface of the lid 6.
6a is formed. Further, a plurality of locking projections 36c are formed on the outer periphery of the upper portion of the operation means mounting portion 36 at predetermined intervals.

The operating means 7 (see FIGS. 1, 2, 6, and 7) provided on the operating means mounting portion 36 of the lid 6 includes a handle 38, a nut 39, a spring washer 40, a stem 41, and a ground presser 42. , Top adapter 43,
It comprises a plurality of V-packings 44, a bottom adapter 45, and an O-ring 46.

When the operating means 7 is incorporated in the cover 6, the cover 6
The stem 41 is inserted into the operation means attaching portion 36 from the back side of the stem 41, and a locking portion 47 formed on the outer periphery near the lower portion of the stem 41.
Is locked to the locking portion 36a of the lid 6.

Then, the bottom adapter 45, the plurality of V-packings 44, and the top adapter 43 are inserted from the surface side of the lid 6 into the stem 41 inserted into the operation means mounting portion 36, and the ground presser 42 is further inserted. The upper opening 48 of the operation means mounting portion 36 is closed by the ground presser 42.

Further, a handle 38, a spring washer 40, and a nut 39 are provided on the stem 41 in this order. The stem 41 loosens the nut 39 and removes the handle 3
By turning 8, a desired angle can be turned.
The tip 41 a of the stem 41 is formed so as to be able to engage with the stem groove 17 of the ball 3.

In the ball valve 1 of the present invention having the above-described structure, when assembling (see FIG. 5), first, the back seat 27 is attached to the end face 8a side of the primary fluid passage 8 of the valve body 2. I do. In this case, the back sheet 27
The back surface 27 is mounted so that the inclined surface 29 side is opposite to the end surface 8a and the thick side of the back seat 27 is on the inner bottom portion 2a side of the valve body 2.

Next, disc springs 19 and 2 are placed in the primary valve seat 18.
The primary side valve seat assembly 4 is formed by incorporating the O, ring 21 and primary ball seat 22 in this order. On the other hand, the secondary-side ball seat 32 is incorporated into the seat retainer 31 to form the secondary-side valve seat assembly 5.

The primary ball seat 22 of the primary valve seat assembly 4 is brought into contact with one end face 15 of the ball 3 and the other end face 16 of the ball 3 is connected to the secondary valve seat assembly 2 of the secondary valve seat 5. The secondary ball seat 32 is brought into contact with the primary valve seat assembly 4 and the balls 3 and 2.
An internal assembly 49 including the secondary valve seat assembly 5 is formed.

Next, the stem groove 17 of the ball 3 of the internal assembly 49 is turned upward, and both sides of the internal assembly 49 are picked, and the disc spring 1 of the primary valve seat assembly 4 is held.
The inner assembly 49 is mounted in the valve main body 2 through the opening 11 of the valve main body 2 in a state where the primary side valve seat assembly 4 is brought closer to the ball 3 by bending the 9 and 20.

In this case, the inclined surface 25 of the primary valve seat assembly 4 of the internal assembly 49 is
The inner assembly 49 can be easily mounted in the valve main body 2 by sliding in contact with the inclined surface 29 of the back seat 27 mounted therein.

Next, the tip 41 of the stem 41 provided on the lid 6
a is the stem groove 1 of the ball 3 of the internal assembly 49
The cover 6 is positioned so as to be able to engage with the cover 7, and the cover 6 is engaged with the concave portion 11 a of the valve body 2.

Next, the bolt 12 is inserted into each hole 37 of the lid 6 and tightened into the screw hole 13 of the valve body 2 to assemble the ball valve 1 of the present invention.

This ball valve 1 is connected to one of the valve bodies 2.
Each pipe is connected to the secondary fluid passage 8 and the secondary fluid passage 9 for use. By operating the handle 38, the ball 3 rotates, and the opening degree of the through hole 14 of the ball 3 with respect to the fluid passage 10 of the valve body 2 changes. Thereby, the flow rate passing through the ball valve 1 can be adjusted to a desired flow rate.

It should be noted that the ball valve 1 of the present invention is not limited to a manual type, and may be a valve which can automatically operate the ball 3 by a fluid pressure such as air as shown in FIG.

[0042]

As described above, in the ball valve according to the present invention, the primary valve seat assembly and the secondary valve seat are assembled by sliding the primary valve seat assembly on the inclined surface of the back seat. The ball clamped between the assembly and the ball can be easily mounted in the valve body.

In the ball valve of the present invention, the back seat having the inclined surface is provided in the valve body, so that both end surfaces of the ball and the one in the valve body are provided as in the prior art.
It is not necessary to form the respective end faces inside the secondary fluid passage and the secondary fluid passage at an angle, so that the machining can be performed more easily as compared with the conventional ball valve, and the manufacturing cost can be reduced. Furthermore, since the opening is formed widely, it is possible to easily replace parts, inspect and clean the inside of the valve body.

Also, by holding the ball between the primary valve seat assembly and the secondary valve seat assembly, the disc spring incorporated in the primary valve seat assembly can be bent. The widths of the seat assembly, the ball, and the secondary valve seat assembly can be reduced so that they can be inserted into the valve body from the opening, and can be mounted more smoothly.

Further, even if abnormal pressure increase occurs in the valve body, the pressure can be released into the pipe without adversely affecting each part, the lid, and the operating means in the volve body by the bending action of the disc spring.

[0046]

[Brief description of the drawings]

FIG. 1 is a sectional view of a ball valve of the present invention.

FIG. 2 is an explanatory diagram of a main part of an operation unit.

FIG. 3 is an exploded cross-sectional view of a primary valve seat assembly.

FIG. 4 is an exploded cross-sectional view of a secondary valve seat assembly.

FIG. 5 is an exploded sectional view showing a main part of the ball valve of the present invention.

FIG. 6 is a perspective view of the valve body as viewed from an opening.

FIG. 7 is a perspective view of a manual ball valve according to an example of the present invention.

FIG. 8 is a perspective view of an automatic ball valve according to an example of the present invention.

FIG. 9 is a partial sectional view of a conventional ball valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Ball valve 2 Valve body 3 Ball 4 Primary valve seat assembly 5 Secondary valve seat assembly 6 Lid 7 Operating means 8 Primary fluid passage 8a Primary fluid passage end face 9 Secondary fluid passage 9a Secondary End face of side fluid passage 10 Fluid passage 11 Opening 14 Ball through hole 15 End face of ball 16 End face of ball 18 Primary valve seat 19 Disc spring 20 Disc spring 21 Ring 22 Primary ball seat 25 Primary valve seat Inclined surface of assembly (primary valve seat) 27 Backsheet 29 Inclined surface of backsheet 30 End surface of backsheet on primary fluid passage side

Claims (2)

[Claims] 1. A valve body having an opening at a position perpendicular to a fluid passage having a primary fluid passage and a secondary fluid passage, and a valve body having a through hole and mounted in the fluid passage of the valve body. A ball for adjusting the flow rate, a primary valve seat assembly and a secondary valve seat assembly disposed at both ends of a through hole of the ball and mounted in the fluid passage of the valve body; A ball valve comprising a lid detachably provided in the opening and operating means provided on the lid to operate the ball, wherein an end face of a primary fluid passage facing the primary valve seat assembly; An end face of the secondary fluid passage facing the secondary valve seat assembly is formed so as to be parallel and orthogonal to the fluid passage, and both end faces of a ball which is both ends of the through hole are formed in parallel, And the above 1 The end face of the side valve seat assembly facing the primary fluid passage is an inclined surface that inclines toward the ball as it goes to the bottom, and the end face between the primary valve seat assembly and the primary fluid passage is A backsheet formed in one side with an inclined surface communicating with the fluid passage and in contact with the inclined surface of the primary valve seat assembly, and formed with the other surface in contact with the end surface of the primary fluid passage in parallel. A ball valve comprising: 2. The primary valve seat assembly as claimed in claim 1, wherein the primary valve seat assembly contacts a primary valve seat, a disc spring, a ring, and the ball.
The ball valve according to claim 1, comprising a secondary ball seat, wherein an end surface of the primary valve seat is an inclined surface that comes into contact with an inclined surface of the back seat.