JP2528163Y2 - Valve seat - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve seat to be mounted on various valves such as a ball valve and a gate valve.

[0002]

Conventionally, as a valve seat which is assembled in the valves described above, for example, as shown in FIG. 4, the first conventional example only expanded graphite body 8 formed by pressure-molding of the valve seat 9 As shown in FIG. 5, a number of metal wires 10 are provided.
A valve seat 12 of a second conventional example formed by pressure-forming an expanded graphite body 11 having embedded therein, and as shown in FIG. 6, each expanded graphite body 14 is integrally formed between a plurality of metal plates 13. There are a valve seat 15 which is pressure-molded by laminating and bonding, a fluororesin molding, a carbon molding, and a metal cutting.

[0003]

The present invention is to provide a However, your first conventional example
Since each of the valve seats 9 and 12 of the second conventional example is equivalent to a product formed only of the expanded graphite bodies 8 and 11, the amount of restoration after compression is small, and the valve seat 15 of the third conventional example is small.
Less rigid than Or One, because the material with a soft, intense wear occurring on the sliding surface of the valve seat 9 and 12,
Have a willing subject point, such withstand repeated use.

[0004] The third conventional example of the valve seat 15, so remains are integrally laminated and bonded in a state where the metal plates 13 ... and the expanded graphite 14 ... and shape retention, sufficient restoration amount had us when compression Can not be obtained and cutting is difficult,
There is a problem that the cost increases. Or One, a large amount of wear occurring in the sealing surface of the mating over a short period of time sealing function has a problem point you drop.

Further, fluororesin molded products have problems in terms of creep and heat resistance, and carbon molded products and metal cut products are liable to wear and stick, and special consideration is required in terms of surface roughness. to some other, you have to cracking and chipping is likely to occur at the time of handling, it is possible to manufacture a large part has a problem is difficult.

On the other hand, it is described in JP-A-63-7696.
There is a valve seat of the configuration shown. Disclosed in the same gazette
Valve seat structure punched from expanded graphite sheet
A ring-shaped expanded graphite sheet and porous metal foil are
It is what was laminated through. This conventional laminate is
When the expanded graphite sheet in the shape of
The laminate also has the property of
It has the property that the amount of deformation in the radial direction is extremely small. This
This is due to the high compressive strength and relatively high rigidity and
It has the advantage of excellent abrasion, but also has the resilience when compressed
Small stress and small follow-up ability to seal surface
There and when applied, the case where the sealing surface varies sealing fluid
Has a problem that the leakage of water easily occurs.

[0007] In view of the above problem, the present invention press-molds an expanded graphite sheet and a thin metal sheet in an appropriately wound state to form a valve having the above-described laminate structure.
Solves the problem that the compression recovery characteristics of
After the compression and compression of the valve seat of the spiral structure
It is an object of the present invention to provide a valve seat that can solve the problems of restoring characteristics, rigidity, and wear resistance .

[0008]

Means for Solving the Problems The invention according to claim 1, wherein the invention is expanded graphite sheet and after the sheet metal overlaid appropriate reels of expanded graphite sheet and metal pressurizes the end surface of the winding stacked body A thin sheet is formed into a zigzag shape, and the expanded graphite sheet and the thin metal sheet are alternately exposed to the end face of the rolled body.

[0009] the invention of claim 2, wherein the invention, in conjunction with structure configuration of the invention of the first aspect, winding stacked superimposed appropriate reels of the expanded graphite sheet and a metal sheet bonded to the integrally It is a valve seat that forms a body.

[0010] the invention of claim 3, wherein the invention is claim 1 or 2 together with proposed structure described, by placing a site consisting of expanded graphite sheet itself on the inner peripheral portion and outer peripheral portion wound superposed body Characterized in that the valve seat is formed.

[0011]

[Action] Valve seat according to claim 1, wherein the invention is expanded graphite sheet and the end face of the winding stacked body and a metal sheet formed by overlapping appropriate number Volume By forming the pressurizing appropriate shape, restoration after compression Improved properties, shape retention after molding, abrasion resistance,
Heat resistance is improved.

A valve seat according to a second aspect of the present invention is a rolled body formed by appropriately winding an expanded graphite sheet and a metal thin plate which are integrally bonded together several times in addition to the operation of the first aspect of the present invention. By forming the valve seat, the same operation and effect as those of the valve seat according to claim 1 can be obtained.

[0013] Valve seat according to claim 3, wherein the invention, in conjunction with the action of the invention of the above Symbol claim 1 or 2, wherein the portion made of expanded graphite sheet itself on the inner peripheral portion and outer peripheral portion of the winding superposed body By arranging, the adhesion to the sealing surface and the sealing property are improved.

According to this invention, since the expanded graphite sheet and the metal sheet constituting the valve seat are formed in a zigzag shape while being wound several times as appropriate, the first conventional example is provided.
In addition, the elasticity is increased as compared with the respective valve seats 9 and 12 of the second conventional example, and the adaptability and followability to the sealing surface are improved.

Moreover, by combining the expanded graphite sheet and the metal sheet, the rigidity is higher than that of the conventional product, the shape retention after forming, the abrasion resistance and the heat resistance are improved, and the production of large parts is achieved. And handling becomes easy.

[0016] One or, by each distribution <br/> location expanded graphite sheet itself to the inner circumferential portion and the outer circumferential portion of the wound lap constituting the valve seat, improved adhesion and sealing against the sealing surface, secondary packing grayed assembled need such Kunar.

[0017]

An embodiment of the present invention will be described in detail below with reference to the drawings. The drawings illustrate a valve seat of the first embodiment is assembled to the ball valve or gate valve, Te Contact have <br/> 1, the valve seat 1, the expanded graphite sheet 2 formed into a tape (e.g., Thickness t = 0.25mm - 0.38m
m) and a stainless steel thin plate 3 (for example, having a thickness t = 25 μm to 0.2 μm) formed to have the same width as the expanded graphite sheet 2.
2 mm, material SUS316L), or a suitable number of windings, with the expanded graphite sheet 2 formed into a tape shape and the metal thin plate 3 integrally bonded by an appropriate adhesive (not shown). Thereafter, the expanded graphite sheets 4 and 4 (for example, thickness t = 0.25 mm to 0.38 mm) formed to have the same width are wound around the inner peripheral portion and the outer peripheral portion to form a ring-shaped wound body 5.

Next, the wound body 5 is placed inside a mold (not shown).
After that, the both ends of the rolled body 5 are uniformly pressed in the axial direction to form a rectangular cross-section, and the expanded graphite sheet 2 and the metal sheet 3 that have been wound several times are formed in a zigzag shape. At the same time, the expanded graphite sheet 2 and the metal sheet 3 are alternately exposed in the radial direction of both end faces of the rolled body 5.

In the above-described embodiment, the sheet metal 3 is set to have a thickness t =
The thickness is set to 25 μm to 0.2 mm, and preferably, the thickness t = 50 μm to 0.1 mm is optimal. In other words, have you the molding time <br/>, since the expanded graphite sheet 2 and the metal sheet 3 is based on the premise that both deformable, thin metal plate 3 thickness t =
If it is set to 0.2 mm or more, molding becomes difficult and the amount of compression decreases, so that conformability to the sealing surface cannot be expected. Conversely, if the thickness of the metal sheet 3 is set to t = 25 μm or less, molding becomes easy, but an increase in the restoration amount cannot be expected.

Accordingly, the metal thin plate 3 is formed with a thickness t = 25 μm-
By setting within 0.2mm, and have you at the time of molding,
The expanded graphite sheet 2 and the thin metal plate 3 are both deformed, so that the bubble sheet 1 having excellent restoration characteristics after compression can be manufactured.

FIG. 2 shows a first use in which ring-shaped valve seats 1, 1 formed by press-molding to appropriate shapes and dimensions are assembled between opposing surfaces of a valve body 6a and a ball 6b constituting a ball valve 6. An example is shown. That is, the valve body 6
The fluid passage formed in the valve body 6a is rotated by rotating the ball 6b pivotally supported by
It is opened or blocked by, One or each valve seat is assembled between the facing surfaces of the valve body 6a and the ball 6b 1, 1
This structure prevents the transfer fluid from leaking.

FIG. 3 shows a second use in which ring-shaped valve seats 1 and 1 each having a suitable shape and size are press-fitted between opposed surfaces of a valve body 7a and a disk 7b constituting a gate valve 7. An example is shown. That is, by opening and closing the disk 7b which is incorporated fitted in the valve body 7a in the vertical direction, the fluid passage formed in the valve body 7a is opened or blocked by the disk 7b, One or a valve body 7a and the disc 7b This structure prevents leakage of the transfer fluid by the valve seats 1 and 1 assembled between the opposed surfaces.

As a comparative example of the valve seat 1 assembled to each of the valves 6 and 7 as described above, for example, a test of an embodiment in which an expanded graphite sheet 2 and a thin metal plate 3 are appropriately wound and pressure-formed. The product A and the test product B of the first conventional example in which only the expanded graphite body 8 is pressure-formed have the same shape and dimensions (inner diameter 32 mm ×
It was press-molded to an outer diameter of 48 mm and a cross section of 8 mm), and a test of the restoration characteristics was performed under the same conditions.

That is, when a load of 200 kgf / cm ² is applied to the test pieces A and B, the restoration amount of the test article B is 0.4 mm, but the restoration amount of the test article A is 0.9 mm. It is proved that the restoration characteristics after compression are excellent.

That is, when assembled to each of the valves 6 and 7,
And it had us when valve opening and closing, be varied load and seal clearances are loaded into the valve seat 1, since the valve seat 1 is elastically deformed to follow the sealing surface of the mating, against the sealing surface of each valve 6,7 Adhesiveness and sealability can be stably obtained.

As described above, since the expanded graphite sheet 2 and the metal sheet 3 constituting the valve seat 1 are formed in a zigzag shape while being wound several times as appropriate, the first conventional example and the second example are used. The elasticity (the amount of restoration after compression) is increased as compared with the valve seats 9 and 12 of the conventional example, and the conformability and followability to the sealing surface are improved.

[0027] One or expansion and a graphite sheet 2 and the metal sheet 3 by molding molded or bonded treated integrally in a zigzag shape, the rigidity becomes higher than the valve seat 9 and 12 of the conventional product, molding As the shape retention afterwards is improved,
Large parts can be easily manufactured and handled.

[0028] One or wear of expanded graphite sheet 2 by scraper function of the sheet metal 3 is prevented, the wear resistance is improved, compared to conventional mainstream was the resin valve seat heat resistance (about 400 ° C. ~ about 600 ° C.).

[0029] 且 one, by arranging the respective expanded graphite sheet 4,4 to the inner peripheral portion and outer peripheral portion of the winding stacked body 5 constituting the valve seat 1, adhesion and seal against the sealing surface of each valve 6,7 sex is improved, Kunar need such assembling the secondary packing immediately.

The present invention is not limited to the configuration of the above embodiment.

[0031] In the above embodiment, to form a wound lap body 5 superimposed appropriate reels of a Rise Zhang graphite sheet 2 and the metal sheet 3 in the helical direction, for example, expanded graphite sheet 2 formed into a tape The metal sheet 3 may be wound several times in the circumferential direction to form a rolled body 5. Further, the cross-sectional shape of the valve seat 1 may be, for example, a trapezoidal cross section, a round cross section, an elliptical cross section, a triangular cross section, or the like. It is also possible to press-mold into a shape according to the purpose of the above.

[Brief description of the drawings]

FIG. 1 is a partially enlarged sectional view showing one embodiment of a valve seat according to the present invention .

FIG. 2 is a longitudinal sectional side view showing a state in which the valve seat of the present invention is assembled to a ball valve.

FIG. 3 is a vertical sectional side view showing a state where the valve seat of the present invention is assembled to a gate valve.

FIG. 4 is a partially enlarged sectional view showing a valve seat of a first conventional example.

FIG. 5 is a partially enlarged sectional view showing a valve seat of a second conventional example.

FIG. 6 is a partially enlarged sectional view showing a third conventional valve seat.

[Explanation of Signs] 2 ... Expanded graphite sheet 3 ... Metal thin plate 4 ... Expanded graphite sheet 5 ... Wound body

Claims (3)

(57) [Scope of request for utility model registration] 1. An expanded graphite sheet (2) and a sheet metal (3) are wound appropriately several times, and an end face of the wound body (5) is pressed to thereby expand the sheet (2) and the sheet metal (3 ). ) Is formed in a zigzag shape, and the expanded graphite sheet (2) and the thin metal plate (3) are alternately exposed to the end face of the rolled body (5) . Wherein said winding superposed body (5), the valve seat of claim 1, wherein each formed by overlaying a sheet metal (3) and the appropriate number Volume said integrally bonded expanded graphite sheet (2). 3. The wound body (5) is combined with the wound body (5).
The valve seat according to claim 1 or 2, wherein a portion consisting of an expanded graphite sheet (4) alone is arranged on an inner peripheral portion and an outer peripheral portion of the valve seat.