JP3130785B2 - Valve device - 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 device having a valve plug for controlling the flow of a fluid by being rotated by a valve shaft, and more particularly to a seal structure for the valve plug.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view showing a conventional valve device, and FIG.
FIG. 5 is a cross-sectional view of a main part of FIG.
Is a valve plug that controls the flow of fluid by being rotated by the valve shaft 1. Reference numeral 13 is a soft sheet formed so as to be in contact with the valve plug 2 and made of a soft member such as Teflon or graphite. It is formed in a substantially cylindrical shape. A spring (elastic member) such as a spring member or a compression coil using a plurality of ring-shaped trapezoidal spring washers alternately laminated on the outer peripheral surface of the soft sheet 13 in the central portion in the longitudinal direction. A spring receiving portion 13a for receiving the spring 14 is provided integrally. The contact surface of the soft seat 13 with the valve plug 2 is formed in such a shape that the close contact with the valve plug 2 is ensured.

Reference numeral 15 denotes a metal seat retainer which presses the soft seat 13 to the valve plug 2 via the spring 14 and has a substantially cylindrical shape as a whole. Although not shown in the drawings, a male screw portion is formed on the outer circumferential surface of the seat retainer 15 on the side opposite to the valve plug 2 and can be screwed with a female screw portion provided on the inner circumferential surface of the conduit. Also,
Reference numeral 15a denotes an engaging step formed so that the soft sheet 13 can be fitted therein, and 15b denotes an engaging step 1 for providing the O-ring 16.
It is a groove formed on the inner peripheral surface of 5a.

Next, the operation will be described. Soft seat 13 fitted in engagement step 15a of seat retainer 15
Is biased by a spring 14 and presses against the valve plug 2. When the valve plug 2 is opened and closed, this pressure contact causes the soft sheet 13 to be appropriately elastically deformed and adhere to the valve plug 2 to maintain the sealing property.

[0005]

Since the conventional valve device is configured as described above, when a high-temperature fluid such as steam flows, the soft sheet 13 is softened by high temperature and the contact pressure from the valve plug 2 is increased. Thus, there is a problem that unnecessary deformation occurs in the soft sheet 13 and fluid leaks from the deformed portion.

[0006] The soft sheet 1
In No. 3, there was a problem that the so-called misalignment and uneven wear occurred, and the sealing performance could not be maintained for a long time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and prevents the leakage of fluid due to unnecessary deformation of a soft sheet even when a high-temperature fluid such as steam is caused to flow. It is an object of the present invention to provide a valve device capable of preventing displacement and uneven wear and maintaining a long sealing performance.

[0008]

According to a first aspect of the present invention, there is provided a valve device for controlling a flow of a fluid by rotating a valve shaft.
Lube plug and a soft seam that can contact the valve plug.
And bets, the seat holder to Nyuho lifting fitting the soft sheet through a sealing material, pressing for pressing and holding the soft seat the valve plug side end portion of the sheet holder by bending the soft sheet side Elastic holding part and the sheet holder
Sheet retainer that urges toward the valve plug via a conductive member
Is that a over Na.

According to a second aspect of the present invention, a portion of the seat holder into which the soft seat is fitted is provided with an engaging step for engaging with the soft seat, and the seat is fitted into the engaging step. The soft sheet is fixed by caulking with a pressing and holding unit.

According to a third aspect of the present invention, a taper portion that expands toward the valve plug is formed on the inner peripheral surface of the soft seat on the valve plug side.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. In the description of the above prior art, portions corresponding to those shown in FIGS. 4 and 5 are denoted by the same reference numerals,
The description is omitted or simplified.

Embodiment 1 FIG. 1 is a cross-sectional view showing a main part of a valve device. In the drawing, reference numeral 3 denotes a substantially cylindrical soft sheet formed so as to be able to contact the valve plug 2 and made of a soft member such as Teflon or graphite. A flange 3a is integrally formed on the outer peripheral edge of the end on the valve plug 2 side. A contact portion 3b is formed on an inner peripheral edge of the end of the soft seat 3 on the valve plug 2 side so as to ensure the close contact with the valve plug 2.

Reference numeral 4 denotes a substantially cylindrical metal sheet holder for fitting and holding the soft sheet 3.

Reference numeral 4a denotes a spring receiving portion integrally provided on the outer peripheral surface near the center in the longitudinal direction of the sheet holder 4 for receiving the spring 14.

Reference numeral 4b denotes an engagement step formed on the inner peripheral edge of the end of the seat holder 4 on the valve plug 2 side for fitting the soft seat 3, and when the soft seat 3 is fitted, the seat holder is formed. 4 and the inner circumferential surface of the soft seat 3 are flush with each other.

Reference numeral 4c denotes a groove formed on the inner peripheral surface of the engaging step portion 4b for providing the O-ring (seal material) 5.

4d is a valve plug 2 of the seat holder 4.
A crimping portion (press holding portion) that presses and holds the flange portion 3a by caulking its end on the side of the flange portion 3a of the soft sheet 3. The length of the caulked portion 4d is
It is formed slightly shorter than the thickness of a. Note that a sealing material such as a so-called liquid gasket may be applied between the caulked portion 4d and the flange portion 3a.

Reference numeral 6 denotes a metal sheet that urges the seat holder 4 toward the valve plug 2 via a spring 14 and presses the contact portion 3b of the soft seat 3 fitted into the seat holder 4 against the valve plug 2. The retainer has an overall shape substantially cylindrical. Although illustrations are omitted,
On the outer peripheral surface of the seat retainer 6 on the side opposite to the valve plug 2,
A male screw portion that can be screwed with a female screw portion provided on the inner peripheral surface of the conduit is formed.

Reference numeral 6a denotes an engaging step formed so that the sheet holder 4 can be fitted therein. The length of the engagement step 6a is formed so that the sheet holder 4 can slide in the axial direction.

Reference numeral 6b denotes a groove formed on the inner peripheral surface of the engaging step 6a for providing the O-ring 16.

Next, the operation will be described. The seat holder 4 fitted into the seat retainer 6 is urged toward the valve plug 2 by a spring 14, whereby the contact portion 3 b of the soft seat 3 fitted into the seat holder 4 is pressed against the valve plug 2. When the valve plug 2 is opened and closed, this pressure contact causes the soft seat 3 to be appropriately elastically deformed and adhere to the valve plug 2 to maintain the sealing property.

Further, since the flange 3a of the soft seat 3 is pressed and held by the caulking portion 4d of the seat holder 4, high temperature fluid such as steam is flowed, and the flange 3a is softened by high temperature to be softened from the valve plug 2. Even if the contact pressure is applied, unnecessary deformation does not occur and fluid leakage is prevented.

Furthermore, since the so-called misalignment and uneven wear do not occur in the soft sheet 3 due to the pressing and holding of the caulked portion 4d, the sealing performance can be maintained for a long time.

As described above, according to the first embodiment, even when a high-temperature fluid such as steam is allowed to flow, fluid leakage due to unnecessary deformation of the soft sheet 3 is prevented, and misalignment and unevenness are prevented. There is an effect that a valve device that can prevent the wear and maintain the sealing performance for a long time can be obtained.

Embodiment 2 FIG. 2 is a sectional view showing a main part of the valve device. In the figure, reference numeral 3 denotes a ring-shaped soft sheet made of a soft member such as Teflon or graphite.

Reference numeral 4 denotes a metal sheet holder formed in a substantially cylindrical shape for fitting and holding the soft sheet 3, except that the groove 4 c in the first embodiment is not formed. The configuration is the same as in the first embodiment. That is, the soft sheet 3 is fitted into the opening formed by the caulked portion 4d, and caulked and fixed by the caulked portion 4d.

Reference numeral 7 denotes a liquid gasket (seal material) applied to the surface of the soft sheet 3 which comes into contact with the sheet holder 4 before the swaging portion 4d of the sheet holder 4 is swaged. It should be noted that other sealing materials may be used as long as they can be applied to the portion and a predetermined sealing property can be ensured.

The configuration of the seat retainer 6, the spring 14, and the like are the same as those in the first embodiment, and a description thereof will be omitted.

Next, the operation will be described. The seat holder 4 fitted into the seat retainer 6 is urged toward the valve plug 2 by a spring 14, whereby the contact portion 3 b of the soft seat 3 fitted into the seat holder 4 is pressed against the valve plug 2. When the valve plug 2 is opened and closed, this pressure contact causes the soft seat 3 to be appropriately elastically deformed and adhere to the valve plug 2 to maintain the sealing property.

Further, the soft sheet 3 includes a sheet holder 4
Since it is pressed and held by the caulking portion 4d and is sealed by the liquid gasket 7, a high-temperature fluid such as steam flows, and the soft sheet 3 is softened by high temperature, and receives a contact pressure from the valve plug 2. However, unnecessary deformation does not occur and fluid leakage is prevented. In particular, since the soft sheet 3 is formed in a ring shape and has a more compact configuration than that of the first embodiment, it is hardly affected by deformation due to expansion or the like.

Further, since the so-called misalignment and uneven wear do not occur in the soft sheet 3 due to the pressing and holding of the caulked portion 4d, the sealing performance can be maintained for a long time.

Further, since the sealing property between the soft sheet 3 and the sheet holder 4 is ensured by the liquid gasket 7, the formation of the groove 4c and the O-ring 5 in the first embodiment becomes unnecessary, and the manufacturing cost can be reduced.

As described above, according to the second embodiment, the soft sheet 3 is unnecessary even when a high-temperature fluid such as steam is flowed by a simpler structure than that of the first embodiment. It is possible to obtain a valve device that can prevent fluid leakage due to various deformations, prevent misalignment and uneven wear, and maintain the sealing performance for a long time.

Embodiment 3 FIG. 3 is a sectional view showing a main part of the valve device, and shows a state (a) before the caulking portion 4d is caulked.
FIG. 6B shows a state (b) after staking. In the figure, reference numeral 3 denotes a soft sheet made of a soft member such as Teflon or graphite, and has the same configuration as that of the first embodiment except that a tapered portion 3c is formed.

That is, the tapered portion 3c is formed in a tapered shape on the inner peripheral surface of the soft seat 3 on the valve plug 2 side so as to expand toward the valve plug 2 side.
As shown in FIG. 3B, the taper angle of the tapered portion 3c has the same inner diameter as the portion where the tapered portion 3c is not formed, after the caulking portion 4d is swaged and the flange portion 3a is elastically deformed. It is formed as follows.

The structure of the other members is the same as that of the first embodiment, and the description is omitted.

Next, the operation will be described. As shown in FIG. 3, the soft sheet 3 is fitted into the sheet holder 4, and the flange 3a is pressed and held by caulking the caulking portion 4d. At this time, when the caulking portion 4d is caulked, the flange portion 3a is elastically deformed, and the portion where the tapered portion 3c is formed has the same inner diameter as the portion where the tapered portion 3c is not formed.

Therefore, by forming the tapered portion 3c in advance, it is possible to prevent the inner peripheral surface of the flange portion 3a from protruding toward the flow channel due to elastic deformation and narrowing the flow channel.
The sealing property of the contact portion 3b can be secured without disturbing the flow of the fluid.

The other operation examples are the same as those in the first embodiment, and a description thereof will be omitted.

As described above, according to the third embodiment, even when a high-temperature fluid such as steam flows, fluid leakage due to unnecessary deformation of the soft sheet 3 is prevented without disturbing the flow of the fluid. In addition, there is an effect that a valve device that can maintain the sealing performance for a long time by preventing misalignment and uneven wear can be obtained.

Incidentally, the tapered portion 3c is formed in the second embodiment.
Of course, may be formed on the soft sheet 3 in the above.

[0042]

As it is evident from the foregoing description, according to the first aspect of the invention, comprises a sheet holder fitted hold the contact Soft seat valve plug via a sealing material, wherein in said seat holder valve the end of the plug side, the software in the pressing and holding part provided by bending the soft sheet side
Since the sheet is configured to be pressed and held , even when flowing a high-temperature fluid such as steam, it is possible to prevent fluid leakage due to unnecessary deformation of the soft sheet,
There is an effect that a can be sealing performance to prevent misalignment or uneven wear longer be maintained. Also, since the soft seat is pressed toward the valve plug by the fluid pressure and is in good contact with the pressing and holding portion of the seat holder , liquid leakage from the inner surface can be prevented.
With that, the soft sheet acts so as to protrude to the valve plug side, there is <br/> effect contact between the valve plug is improved.

According to the second aspect of the present invention, the portion of the seat holder into which the soft sheet is fitted has an engaging step for engaging with the soft sheet, and the soft sheet fitted to the engaging step is provided. Is fixed by caulking with a pressing and holding portion, so that even when a high-temperature fluid such as steam is flown, the fluid due to unnecessary deformation of the soft sheet can be provided even with a simpler configuration than the invention according to claim 1. While preventing leakage,
This has the effect of preventing misalignment and uneven wear and maintaining the sealing performance for a long time.

According to the third aspect of the present invention, since the tapered portion which expands toward the valve plug is formed on the inner peripheral surface of the soft seat on the valve plug side, a high-temperature fluid such as steam flows. Even in this case, it is possible to prevent leakage of the fluid due to unnecessary deformation of the soft sheet without disturbing the flow of the fluid, to prevent misalignment and uneven wear, and to maintain sealing performance for a long time.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a valve device according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view showing a main part of a valve device according to Embodiment 2 of the present invention.

FIG. 3 is a cross-sectional view showing a main part of a valve device according to Embodiment 3 of the present invention, in a state (a) before a caulking portion is caulked;
FIG. 6B shows a state (b) after staking.

FIG. 4 is a sectional view showing a conventional valve device.

FIG. 5 is a sectional view of a main part of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve shaft 2 Valve plug 3 Soft seat 3c Taper part 4 Seat holder 4b Engaging step part 4d Caulking part (press holding part) 5 O-ring (seal material) 6 Sea retainer 7 Liquid gasket (seal material) 14 Spring (elastic member) )

Continuation of the front page (56) References JP-A-54-49626 (JP, A) JP-A-60-60377 (JP, A) JP-A-4-136567 (JP, A) JP-A-50-83821 (JP) , A) Fully open sho 56-90545 (JP, U) Fully open sho 59-85462 (JP, U) Full open flat 2-124377 (JP, U) Full open flat 4-56275 (JP, U) Full open flat 2-143571 (JP, U) JP 4-2833 (JP, B2) JP 46-3756 (JP, B1) JP 6246050 (JP, Y2) JP 61-21647 (JP, B2) Y2) Jikken Sho 53-6816 (JP, Y2) Jikken 46-1759 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16K 5/00-5/22 F16K 3 /twenty two

Claims (3)

(57) [Claims] A valve plug for controlling the flow of fluid by being rotated by 1. A valve shaft, and soft sheets can contact formed on the valve plug, the soft sheet through the sheet Lumpur material through a sheet holder fitted Nyuho lifting and pushing holder for pressing and holding the soft seat the valve plug side end portion of the sheet holder by bending the soft sheet side, the elastic member the sheet holder Te
A valve device comprising: a seat retainer biasing in a lug direction . 2. A portion of the seat holder into which the soft sheet is fitted, provided with an engaging step for engaging with the soft sheet,
2. The valve device according to claim 1, wherein the soft seat fitted into the engaging step portion is caulked and fixed by a pressing and holding portion. 3. The valve device according to claim 1, wherein a tapered portion expanding toward the valve plug is formed on an inner peripheral surface of the soft seat on the valve plug side.