JPH07167309A - Valve body of centered butterfly valve and its processing - Google Patents

Abstract

PURPOSE:To enable precise process of an outer diameter and a thrust surface of a compound valve body which is prepared by coating an outer peripheral surface of a metal core with non-metal material. CONSTITUTION:A disc-like compound valve body 12 is prepared by integrating non-metal outer shape 19 with an outer surface of a metal core 18 at whose center a valve bar through-hole 15 is formed. A centering seat 22 is formed on the outer surface of the compound valve body 12 symmetrically in respect to a line perpendicular to a center line of the valve bar through-hole 15. A V-shaped groove 23 is formed on the centering seat 22 along the center line perpendicular to the center line of the hole. A valve body outer surface in the vicinity of a boss, including the valve bar through-hole 15 is a plane 21 parallel to a center plate of the valve body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve body for a central butterfly valve, and more particularly to a valve body coated with a non-metallic material and a method for processing the valve body.

[0002]

2. Description of the Related Art Conventionally, there is known a central butterfly valve which is a butterfly valve used to control various fluid passages and in which a valve rod is axially supported by a rotary shaft center of a valve body. A butterfly valve rotatably supports a disc-shaped valve body made of a metallic or non-metallic rigid material in a hollow cylindrical valve body made of a metallic or non-metallic rigid material. It has a basic structure in which a sealing member made of an elastic material such as rubber called a seat ring is arranged between the two, and the outer peripheral edge of the valve body is brought into pressure contact with the inner peripheral surface of the seat ring to perform a sealing action. There is. Therefore, the valve body and the seat ring need to be brought into pressure contact with each other with an appropriate pressure contact force, and if the pressure contact force is excessively large, the rotational drive force of the valve body may become large and the drive operation may become difficult. If the pressure contact force is too small, the sealing action may be reduced and the fluid may leak. Therefore, accurate machining is required for the size and shape of the outer peripheral surface of the valve body. Further, in the vicinity of the valve rod, the valve body and the seat ring are formed on a flat thrust surface which is constantly in pressure contact,
Since the thrust surface is always worn more by pressure contact than the arcuate portion of the valve body, more precise size and shape processing is required.

The valve body of a butterfly valve for controlling a corrosive fluid adopts an integrated structure of an expensive metal material such as stainless steel or titanium depending on the degree of corrosion, and after casting, it is placed outside the valve body. Diameter processing is performed, and then the valve rod insertion hole is processed to make a product.

Conventionally, the applicant of the present invention has, as his in-house know-how, integrally formed a protrusion (2) for outer diameter machining on the outer surface of the valve body (1) during casting as shown in FIGS. , This nail
A jig for chucking (2) on the lathe to accurately machine the outer diameter to a predetermined size and shape, and then fitting the outer diameter of the valve body after machining the outer diameter as shown in FIG. 19 (3) Fix the valve body (1) to the bed, move the bed (4) up and down, left and right to bring out the core, and machine the valve rod insertion hole (5) and the flat thrust surface (6) with the boring machine. ing. After the machining is completed, the machining claw (2) is cut off to finish the surface. The cutting and finishing of the machining claw (2) requires 30% of the total turning time. .

When the valve rod insertion hole (5) and the flat thrust surface (6) are machined by the boring machine, the valve rod insertion hole (5) is placed outside the valve body (1) as shown in FIG. The processing size and accuracy are set so that they are half the diameter (A), that is, the A / 2 position, and the thrust surface (6) is half the B dimension that passes through the center of the claw (2), that is, B / 2. It is important to raise. If the valve stem through hole (5) and thrust surface (6) are not accurately machined to A / 2 and B / 2, respectively, the valve stem axial center or thrust surface will be eccentric, so when closing the valve. The pressure contact force between the seat ring and the valve body is partially different, which causes fluid leakage.

The integral type valve body made of a metal material is processed by the above method. However, the core of the valve body is made of metal, and the outer peripheral surface of the core has a corrosion resistant synthetic resin or rubber. Conventionally, there has been no suitable method for processing a composite type valve body in which a non-metal material such as is coated and integrated.

[0007]

SUMMARY OF THE INVENTION The present invention is intended to accurately machine the outer diameter and thrust surface of a composite type valve body in which the outer peripheral surface of a metal core is coated with a non-metallic material.

[0008]

In order to solve the above-mentioned problems, the means adopted by the first invention has a valve rod insertion hole (15) at the center.
On the outer surface of the metal core (18) that penetrates through the
On the outer surface of the disk-shaped composite valve body (12) formed by integrating the above, a centering seat (22) is formed at a symmetrical position orthogonal to the center line of the valve rod insertion hole (15), and the core is formed. A V-shaped groove (23) is formed in the feeding seat (22) along a center line orthogonal to the center line, and
The outer surface of the valve body near the boss portion including the valve rod insertion hole (15) is formed on a plane (21) parallel to the center plane of the valve body.

A second aspect of the present invention relates to a method for processing the valve body according to the first aspect of the present invention, in which the outer surface of the metal core portion (18) which penetrates through the valve rod insertion hole (15) at the center is not covered. On the outer surface of the disk-shaped composite valve body (12) formed by integrating the metal outer shape part (19), the centering seat (22) is arranged at a symmetrical position orthogonal to the center line of the valve rod insertion hole (15). ) Is formed on the centering seat (22) along a center line orthogonal to the center line, and a V-shaped groove (23) is formed, and a portion near the boss portion including the valve rod insertion hole (15) is formed. When machining the outer peripheral edge (20) of the valve body and the thrust surface (16) in which the outer surface of the valve body is formed in a plane (21) parallel to the center plane of the valve body, the V mount is mounted on the spindle mount jig at a position opposite to the V V-shaped protrusion that fits in the groove (23)
(29) and the valve stem guide (2
8) is formed, the V-shaped projection (29) and the V-shaped groove (23) are engaged to perform B / 2 center indexing, and the valve rod jig (30) inserted into the valve rod guide (28). ) Through the valve rod insertion hole (15) to A / 2
After the center indexing is performed, it is sandwiched and fixed by a tailstock jig (26) to process the outer peripheral edge (20) and the thrust surface (16) of the valve body.

[0010]

[Function] The V-shaped groove (23) is engaged with the V-shaped projection (29) of the spindle mount jig (25) to perform B / 2 center indexing of the valve body (12), and the valve rod. While inserting the valve rod jig (30) inserted in the guide (28) into the valve rod insertion hole (15) to perform A / 2 center indexing, the valve body (12) is attached to the spindle mount jig (25). And the tailstock jig (26) so that the processed core and the core of the valve body are aligned with each other. After that, the outer peripheral edge (20) of the valve body (12) and the thrust surface (16)
Since the machining is performed, the outer peripheral edge and the thrust surface can be accurately machined without eccentricity.

[0011]

According to the present invention, the shape and size of the outer peripheral edge and the thrust surface of the composite type valve body including the metal core portion and the non-metal outer shape portion can be accurately processed without eccentricity. At the same time, since post-processing such as cutting of the chucking claw after processing is unnecessary, it is possible to reduce the processing cost and time.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below with reference to the drawings. In FIG. 1, (10) is a valve body having a cylindrical fluid passage (11) passing therethrough, and (12) is a disc-shaped valve body rotatably supported in the valve body (10). ,(13)
Is an elastic sealing material called a seat ring mounted on the inner peripheral surface of the valve body (10), and is made of soft elastic synthetic resin, rubber or the like. As shown in FIG. 2, a valve shaft hole (14) is bored through the seat ring (13) at a diametrically opposed position of the valve body (10), and the valve shaft hole (14) is pivotally supported. A valve stem insertion hole (15) for the valve stem is formed so as to penetrate the valve body (12). Around the valve stem, the valve body (12) and the seat ring (13) are pressed against each other by flat thrust surfaces (16) and (17) to prevent fluid from leaking along the valve stem.

The valve body (12) has a metal core (18) shown in FIG.
And a non-metal outer portion (1) covering the outer peripheral surface of the core portion (18).
9), and the outer shape part (19) is integrated with the outer periphery of the core part (18) by insert molding. By such molding, the valve body (12) can be mass-produced and the outer shape can be molded with required precision. However, the shape and size of the outer peripheral edge (20) of the valve body (12) which is in pressure contact with the seat ring (13) and the shape and size of the thrust surface (16) are sufficiently accurate and shaped only by such integral molding. It is not possible to expect molding, and it is molding with a mold, and the outer periphery of the valve body (20)
It is also necessary to remove the molding burr, which is located at the mold joining line and has molding burrs.

According to the present invention, the outer peripheral edge (20) of the composite type valve body including the metal core portion (18) and the non-metal outer shape portion (19).
Also, the shape and dimensions of the thrust surface (16) are processed accurately and the molding burr is removed.

As shown in FIG. 3, the metallic core portion (18) has a reduced shape which is substantially similar to the outer shape of the valve body (12), and a valve rod insertion hole (15) is formed at the center thereof. . The valve rod insertion hole (15) is formed as a hole having a rectangular cross section, and the apex of the rectangle is positioned on the center line CC of the valve rod insertion hole (15) as shown in FIG. Outline (1
9) is made of corrosion-resistant synthetic resin, rubber, etc.
Create the outer shape of 2) with the required accuracy. In the vicinity of the boss part through which the valve rod is inserted, the outer surface of the outer shape part (19) is a plane parallel to the valve body center plane DD line passing through the longitudinal center of the valve body (12).
It is formed in (21). Further, a centering seat (22) is projectingly provided on one side surface of the outer shape part (19). The centering seat (22) differs from the above-mentioned chucking claw formed by the applicant for processing an integral valve body in that the protruding height is different from that of the fluid flowing along the surface of the valve body. It is sufficiently low that it does not have an adverse effect, and cannot be used as a chucking claw. The centering seat (22) is formed at a symmetrical position centering on the valve rod center line C-C and is orthogonal to the center line C-C of the valve rod insertion hole. It is positioned on the E line and its outer surface is formed in a plane parallel to the valve body central plane DD line as shown in FIG. Further, at the center of the centering seat (22), the V-shaped groove (23) is located on the orthogonal center line EE and extends along the same line.
Is formed.

The core portion (18) is not limited to a shape similar to the valve body (12). As shown in FIGS. 8 to 10, the valve rod insertion hole (15)
The shape may include only the central boss portion including the. Such a shape of the core portion (18) is particularly suitable for a small-diameter butterfly valve. The core portion (18) shown in FIGS. 8 to 10 has a slip prevention protrusion (24) for preventing slipping with the outer shape portion (19).
Let it bite into the outer shape (19). Further, the valve rod insertion hole (15) is of course not limited to a square cross section, but may have a polygonal shape, a key groove cross section as shown in FIG. 9, or a serration cross section as shown in FIG. It may be. In any of the cross-sectional shapes, the apex of the groove is located on the valve rod center line C-C.

Next, processing of the valve body will be described. Figure 1
Referring to 1 and 12, the valve body (12) is clamped and fixed to the spindle mount jig (25) and the tailstock jig (26), and the center (27) of the lathe is held.
It is pushed by and the core for processing is taken out. That is, the core can be easily taken out by a lathe for processing, but it is important to match the core of the valve body (12) with the core for processing.

For this reason, the valve stem guides (28) are formed at both ends of the spindle mount jig (25) in the diametrical direction, and the center of the valve stem guides (28) is located in the valve stem insertion hole (15) of the valve body. Align with the center.
Further, a V-shaped projection (29) is formed at a diametrically opposed position orthogonal to the center line of the valve rod guide (28). This V-shaped protrusion (2
While engaging 9) into the V-shaped groove (23), the centering seat of the valve body (12) is seated and set on the spindle mount jig (25). As a result, the valve body (12) is indexed to the size of B / 2. Further, the valve rod jig (30) is inserted into the valve rod guide (28) and inserted into the valve rod insertion hole (15) of the valve body (12). As a result, the valve stem center line C
-C line is set, A / 2 is indexed, and B / 2 is set
As the center of the valve body (12) coincides with the center (27) of the lathe, the machining of the outer peripheral edge (20) and thrust surface (16) of the valve body (12) can be performed accurately. It becomes possible to do it.

As described above, the valve body (12) is attached to the spindle mount jig (2
After setting A / 2 and B / 2 in 5), set them, and then attach them to the lathe while sandwiching them with the tailstock jig (26).
The outer peripheral edge (20) and the thrust surface (16) are processed. The valve rod jig (30) is removed during processing.

[Brief description of drawings]

FIG. 1 External perspective view

FIG. 2 is an enlarged view of a part of a valve body and a seat ring.

FIG. 3 is a perspective view of the core of the valve body.

FIG. 4 is a perspective view of a valve body.

FIG. 5 is an enlarged perspective view of a centering seat.

FIG. 6 is a front view of the valve body.

FIG. 7 is a sectional view of the valve body.

FIG. 8 is a sectional view of a modification.

FIG. 9 is a sectional view of a modification.

FIG. 10 is a sectional view of a modification.

FIG. 11 is a perspective view showing a state in which the jig is set on a processing jig.

FIG. 12 is an exploded perspective view showing a state where the jig is set on a processing jig.

FIG. 13 is a plan view of a spindle mount jig.

FIG. 14 is a side view in which a part of the spindle mount jig is cut away.

FIG. 15 is a plan view of a tailstock jig.

FIG. 16 is a cross-sectional view of a tailstock jig.

FIG. 17 is a front view of a valve body according to the know-how of the applicant.

FIG. 18 is a plan view of a valve body according to the know-how of the applicant.

FIG. 19 is a schematic view showing a processing method according to the know-how of the applicant.

FIG. 20 is a diagram showing an indexing method based on the know-how of the applicant.

[Explanation of symbols]

 10 valve body 11 fluid passage 12 valve body 13 seat ring 14 valve shaft hole 15 valve rod insertion hole 16 thrust surface 17 thrust surface 18 core portion 19 outer shape portion 20 outer peripheral edge 21 parallel flat surface 22 centering seat 23 V-shaped groove 24 Idling prevention protrusion 25 Spindle mount 26 Tailstock jig 27 Center 28 Valve rod guide 29 V-shaped protrusion 30 Valve rod jig

Claims (2)

[Claims] 1. A disc-shaped composite valve body (12) in which a non-metal outer shape portion (19) is integrally formed on the outer surface of a metal core portion (18) which penetrates the valve rod insertion hole (15) at the center. ), The valve rod insertion hole (15)
A centering seat (22) is formed at a symmetrical position orthogonal to the center line of the center line, and a V-shaped groove (23) is formed in the centering seat (22) along the center line orthogonal to the center line. Together with the valve rod insertion hole (15)
A valve element for a central butterfly valve, characterized in that an outer surface of the valve element near the boss portion including is formed on a plane (21) parallel to the central plane of the valve element. 2. A disc-shaped composite valve body (12) in which a non-metal outer shape part (19) is integrated with the outer surface of a metal core part (18) which penetrates the valve rod insertion hole (15) at the center. ), The valve rod insertion hole (15)
A centering seat (22) is formed at a symmetrical position orthogonal to the center line of the center line, and a V-shaped groove (23) is formed in the centering seat (22) along the center line orthogonal to the center line. Together with the valve rod insertion hole (15)
The outer peripheral edge (20) of the valve body and the thrust surface (16) in which the outer surface of the valve body near the boss portion including is formed on a plane (21) parallel to the center plane of the valve body.
In the machining of (1), a V-shaped projection (29) that engages with the V-shaped groove (23) is formed on the spindle mount jig at a position opposed to the center line, and a valve rod guide ( 28) is formed, the V-shaped projection (29) and the V-shaped groove (23) are engaged to perform B / 2 center indexing, and the valve rod jig (30) inserted into the valve rod guide (28) is formed. ) Is inserted into the valve rod insertion hole (15) to perform A / 2 center indexing, and then clamped and fixed by the tailstock jig (26), and the outer peripheral edge (20) of the valve body and the thrust surface ( A processing method of a central butterfly valve, which is characterized by performing the processing of 16).