JP4420308B2 - Valve seat device for metal touch butterfly valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
According to the present invention, the rotation of the metal butterfly valve body provided in the valve stem causes the seal surface provided on the outer periphery thereof to directly face the metal valve seat ring member provided in the valve stem. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve seat device in a metal touch type butterfly valve adapted to perform metal touch.
[0002]
[Prior art]
Conventionally, this type of metal touch type butterfly valve has an outer peripheral surface of a metal butterfly valve body 2 disposed in a cylindrical valve rod 1 as shown in FIG. A center D of a valve shaft 3 formed on a spherical sealing surface 2a having a radius R and rotatably supporting the butterfly valve body 2 with respect to the valve rod 1 is appropriately separated from the center C of the sealing surface 2a. The butterfly type valve body 2 is rotated in the direction of the arrow A by the valve shaft 3 and the sealing surface 2a is made of metal which is fixed to the valve rod 1 and is located at a portion eccentric by E. The ring-shaped valve seat ring member 4 is configured to be closed by being directly metal touched with respect to the inner peripheral surface of the ring-shaped valve seat ring member 4 and to be opened by rotating in the direction of arrow B on the valve shaft 3. Yes.
[0003]
In this case, the conventional butterfly valve assumes that the fluid flows in one direction as indicated by an arrow F, and this one-way flow is caused to flow between the seal surface 2a of the butterfly valve body 2 and the inner periphery of the valve seat ring member 4. It is configured to close by a single metal touch directly with the surface.
[0004]
[Problems to be solved by the invention]
In the conventional metal touch type butterfly valve, as described above, assuming that the fluid flows in the direction of arrow F, the sealing surface 2a in the butterfly valve body 2 and the valve seat ring member are closed against the flow in this direction. 4 is achieved by one metal touch with the inner peripheral surface in FIG. 4, so that the butterfly valve of this configuration also flows in the direction opposite to the arrow F as indicated by the arrow G. When applied to the case, the butterfly valve body 2 is opened by the flow in the reverse direction indicated by the arrow G because the rotation center D is eccentric from the center C of the seal surface 2a by an appropriate distance E. Therefore, in the one metal touch, the certainty of blocking the flow in the reverse direction is low, and leakage occurs.
[0005]
That is, in the conventional configuration using one metal touch, there is a problem that the reliability of blocking both the forward flow indicated by the arrow F and the reverse flow indicated by the arrow G is low.
[0006]
It is a technical object of the present invention to provide a metal touch butterfly valve that can improve the certainty of blocking both forward and reverse flow.
[0007]
[Means for Solving the Problems]
In order to achieve this technical problem, the present invention
“A valve rod , a metal butterfly valve body provided to rotate in the valve rod, and a metal valve seat ring member provided in the valve rod, and by rotation of the butterfly valve body, In the butterfly valve configured to make a metal touch to the inner peripheral surface of the valve seat ring member at the outer peripheral seal surface,
The valve seat ring member is formed as a seal portion in which two metal plates are overlapped, and the inner circumferences of both metal plates are curled in opposite directions to make a metal touch to the seal surface of the butterfly valve body , Of the two metal plates, a bulge portion in the opposite direction is provided on the disc portion outside the seal portion so as to extend in the circumferential direction, while the bulge portion of the disc portions of the two metal plates is more than the bulge portion. The outer portion is fixed to the valve rod in a state of being sandwiched between the receiving surface provided on the valve rod and the pressing ring body attached to the valve rod in the overlapping direction of both metal plates, The movement of the valve rod in the axial direction is prevented by the receiving surface and the pressing ring body . "
It was configured as follows.
[0008]
[Operation and effect of the invention]
With this configuration, when the butterfly valve body is closed and rotated, the seal portions provided on the inner circumferences of the two metal plates are individually metal-touched independently of each other on the seal surface on the outer circumference.
[0009]
In other words, since the seal parts in the two metal plates are separately metal-touched independently of each other with respect to the seal surface in one butterfly valve body, both the forward flow and the reverse flow are provided. The certainty of blocking the flow can be remarkably improved as compared with the case where both flows are blocked by a single metal touch as in the prior art.
[0010]
Moreover, the two metal touches of the sealing surface of the butterfly valve body and the sealing portions of both metal plates are independent of each other, so that one metal touch is in the forward direction and the other metal touch is in the reverse direction. In accordance with the flow of each, it is possible to set the flow in both directions separately so as to be completely blocked, so that the certainty of blocking the flow in both forward and reverse directions can be further improved.
[0011]
In addition, a bulge portion in the opposite direction to each other is provided on the disk portion outside the seal portion of the two metal plates so as to extend in the circumferential direction, while the bulge portion of the disk portions in the two metal plates. By fixing the portion outside the portion to the valve rod with the receiving surface provided on the valve rod and the pressing ring body attached to the valve rod sandwiched in the overlapping direction of both metal plates, The bulge can allow the seal part in the metal plate to move in the radial direction while securely touching the seal surface of the butterfly valve body. And the difference in thermal expansion between the components can also be reliably absorbed.
[0012]
Further, in the case where the bulge portion is provided, as described in claim 2 , a portion between the seal portion and the bulge portion of the disc portions of the two metal plates is arranged in an overlapping direction of the two metal plates. When the seal portion in both the metal plates moves in a radial direction while being in a metal touch with respect to the seal surface of the butterfly valve body, the seal portion of the disc portion and Since the portion between the bulging portion can be prevented from buckling, when the seal portion moves in the radial direction, the metal touch with respect to the sealing surface changes so as to become weaker or stronger than necessary. Can be reliably prevented, and a stable metal touch can be obtained.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
[0014]
In this figure, reference numeral 11 denotes a metal valve rod formed in a cylindrical shape, and reference numeral 12 denotes a metal butterfly valve body disposed in the valve rod 1.
[0015]
The outer periphery of the butterfly valve body 12 is formed in a spherical sealing surface 12a having a radius R centered on a point C on the central axis 11a of the passage in the valve rod 11, and the butterfly valve body 12 is The pair of upper and lower valve shafts 13a and 13b fixed to the back surface so as to extend in the vertical direction penetrates the valve rod 11 and is pivotally supported.
[0016]
In this case, the center D of the rotary shafts 13a and 13b is separated from the axis 11 ′ of the valve rod 11 by an appropriate distance E from the center C of the radius R of the spherical sealing surface 12a in plan view (FIG. 2). The butterfly valve body 12 is positioned in a direction eccentric in the right-angle direction, and the butterfly valve body 12 is rotated in the direction of arrow A by one of the valve shafts 13a and 13b in the direction of arrow A. The seal surface 12a on the outer periphery is closed by a so-called metal touch that contacts and presses against the metal valve seat ring member 14 provided in the valve rod 11, while the one valve shaft 13a has an arrow. It is configured to open by rotating in the B direction.
[0017]
As shown in FIGS. 3 and 4, the valve seat ring member 14 is formed by superposing two metal plates 15 and 16, and the inner peripheries of both the metal plates 15 and 16 are opposite to each other. By curling in the direction, the seal portions 15a and 16a are formed so as to directly press and contact (metal touch) the seal surface 12a of the butterfly valve body 12.
[0018]
The curled seal portions 15a and 16a are loaded with vertically-divided metal pipe ring bodies 17 and 18, and spring rings are placed inside the ring bodies 17 and 18, respectively. Spring ring bodies 19 and 20 by coil springs wound in a coil shape are loaded.
[0019]
In addition, bulge portions 15c and 16c in opposite directions are provided on the disc portions 15b and 16b outside the seal portions 15a and 16a of the metal plates 15 and 16 so as to extend in the circumferential direction.
[0020]
Then, the two metal plates 15 and 16 are overlapped and inserted into the valve stem 11 in this state, and the disk portions 15b and 16b are provided with a receiving surface 11a provided in the valve rod 11, The pressure ring body 21 is sandwiched between the pressure ring body 21 slidably inserted into the valve rod 11, and the pressure ring body 21 is provided in the receiving ring body 23 fixed by a stopper 22 in the valve rod 11. By moving forward toward the receiving surface 11a by screwing in a plurality of bolts 24, the metal plates 15 and 16 are moved relative to the valve rod 11, and the disk portions 15b and 16b of the metal plates 15 and 16 are connected. Among them, the bulging portions 15c and 16c are fixed so as to sandwich the portion outside the bulging portions 15c and 16c.
[0021]
In this case, the receiving surface 11a and the pressing ring body 21 are provided with grooves 11a 'and 19' into which the bulging portions 15c and 16c are fitted, and the disk portions 15b in both the metal plates 15 and 16, respectively. Portions of 16b between the sealing portions 15a and 16a and the bulging portions 15c and 16c are supported so as to be sandwiched between the receiving surface 11a and the pressing ring body 21.
[0022]
Further, the movement of the valve rod 11 in the direction of the axis 11 ′ in the seal portions 15 a, 16 a of both the metal plates 15, 16 is configured to be blocked by the receiving surface 11 a and the pressing ring body 21. Yes.
[0023]
Although not shown in the figure, the metal plates 15 and 16 are fixed by sandwiching them, but a sealing gasket is inserted between each of the metal plates 15 and 16 and the receiving surface 11a and the pressing ring body 21. Alternatively, both the metal plates 15 and 16 may be integrated by welding on the outer periphery thereof, and a gasket for sealing may be interposed between these, the receiving surface 11a and the pressing ring body 21, Further, a liquid sealing agent may be applied between the metal plates 15 and 16 instead of inserting a gasket .
[0024]
In this configuration, when the butterfly valve body 12 is closed as indicated by a solid line in the figure, the seal portions 15a and 16a provided on the two metal plates 15 and 16 are provided on the outer seal surface 12a by metal touch. To do.
[0025]
Since the two metal touches to the seal surface 12a by the two seal portions 15a and 16a are independent from each other, both the forward flow indicated by the arrow F and the reverse flow indicated by the arrow G are performed. The certainty of blockage can be significantly improved compared to the case of using a single metal touch.
[0026]
In addition, as described above, the two metal touches by the seal portions 15a and 16a in the both metal plates 15 and 16 are independent from each other, so that one metal touch is flowed in the positive direction indicated by the arrow F. Each of the other metal touches can be set separately to flow in the opposite directions indicated by arrow G, and the flows in both directions can be completely blocked.
[0027]
That is, for example, the shape and size of the portion where the seal portion 15a of the one metal plate 15 of the outer peripheral seal surface 12a of the butterfly valve body 12 is metal touched are matched to the flow in the positive direction indicated by the arrow F. While setting the flow in the positive direction to be completely occluded, the shape and size of the portion of the outer seal surface 12a of the butterfly valve body 12 where the seal portion 15a of the other metal plate 16 is metal touched are indicated by arrows According to the reverse flow indicated by G, by setting so that the reverse flow can be completely blocked, the certainty of blocking the forward and reverse flow can be improved.
[0028]
And the bulging parts 15c and 16c are provided in the disc parts 15b and 16b in the said both metal plates 15 and 16 so that it may extend in the circumferential direction, Therefore The seal | sticker part 15a in both the metal plates 15 and 16 is provided. The swelled portion 15c, 16a moves in a radial direction, that is, in a direction perpendicular to the axis 11 'of the valve rod 11 in a state in which the sealing surface 12a of the butterfly valve body 12 is securely metal-touched. 16c is acceptable.
[0029]
Further, of the disc portions 15b and 16b of the metal plates 15 and 16, the portion between the seal portions 15a and 16a and the bulge portions 15c and 16c is the receiving surface 11a of the valve rod 11 and the pressing ring body 21. Thus, the seal portions 15a and 16a in the metal plates 15 and 16 are supported with respect to the seal surface 12a in the butterfly valve body 12 by supporting the metal plates 15 and 16 in the overlapping direction. When the metal plate is moved in the radial direction while being touched with metal, it is possible to reliably prevent the portions of the disk portions 15b and 16b between the seal portions 15a and 16a and the bulging portions 15c and 16c from buckling.
[Brief description of the drawings]
FIG. 1 is a longitudinal front view showing an embodiment of the present invention.
2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is an enlarged view of a main part of FIG. 1;
FIG. 4 is an enlarged cross-sectional view showing a disassembled state of the valve seat ring member.
FIG. 5 is a longitudinal sectional front view showing a conventional butterfly valve.
[Explanation of symbols]
11 Valve shaft 11 'Axis 11a Receiving surface 12 Butterfly valve body 12a Seal surface 13a, 13b Valve shaft 14 Valve seat ring member 15, 16 Metal plate 15a, 16a Seal portion 15b, 16b Disc portion 15c, 16c Swelling portion 17, 18 Pipe ring body 19, 20 Spring ring body with coil spring 21 Press ring body

Claims (2)

A valve rod , a metal butterfly valve body provided to rotate in the valve rod, and a metal valve seat ring member provided in the valve rod, and by rotating the butterfly valve body, In the butterfly valve configured to make a metal touch to the inner peripheral surface of the valve seat ring member on the outer peripheral seal surface,
The valve seat ring member is formed as a seal portion in which two metal plates are overlapped, and the inner circumferences of both metal plates are curled in opposite directions to make a metal touch to the seal surface of the butterfly valve body , Of the two metal plates, a bulge portion in the opposite direction is provided on the disc portion outside the seal portion so as to extend in the circumferential direction, while the bulge portion of the disc portions of the two metal plates is more than the bulge portion. The outer portion is fixed to the valve rod in a state of being sandwiched between the receiving surface provided on the valve rod and the pressing ring body attached to the valve rod in the overlapping direction of both metal plates, A valve seat device in a metal touch butterfly valve , wherein movement of the valve rod in the axial direction is prevented by the receiving surface and the pressing ring body . In the description of claim 1, a portion between the seal portion and the bulging portion of the disc portions of the two metal plates is arranged in the overlapping direction of the two metal plates with the receiving surface and the pressing ring body. A valve seat device in a metal touch butterfly valve characterized by being supported in a sandwiched state .

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