JP3067963B2 - High-temperature butterfly valve seat structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat structure for a high-temperature butterfly valve used for industrial purposes.

[0002]

2. Description of the Related Art A high-temperature butterfly valve used for industrial purposes is, for example, as shown in FIG.
And a valve body 4 that rotates about the axis of the valve stem 2 to open and close the flow path 3 in the valve box is provided at a position eccentric from the axis of the valve stem 2. A valve seat 5 with which the peripheral edge of the valve body 4 slides in contact with the inner peripheral surface 1 is formed of metal. Note that 6 indicates a positive pressure direction, and 7 indicates a reverse pressure direction.

[0003]

In the above-mentioned conventional high-temperature butterfly valve, the metal valve seat 5 is provided, so that even when the valve body 4 and the like expand due to an increase in temperature, biting occurs. This cannot be expected, and seizure may occur at the portions of the valve body 4 and the valve seat 5 that are in sliding contact with each other, which may cause malfunction of the valve body 4. For this reason, the bearing 8 in the valve body 4
It is necessary to increase the clearance L, but if the clearance L is large, the gap between the peripheral portion of the valve body 4 and the valve seat 5 is widened when receiving a pressure in the counter pressure direction 7, and the amount of leakage increases. There is a problem.

An object of the present invention is to provide a seat structure for a high-temperature butterfly valve which can suppress seizure and malfunction and reduce the amount of leakage at the time of back pressure. Is what you do.

[0005]

In order to solve the above-mentioned problems, a seat structure of a high-temperature butterfly valve according to the present invention is provided with a valve element which rotates about an axis of a valve rod to open and close a flow passage in a valve box. A valve structure for a high-temperature butterfly valve, which is provided at a position eccentric from the axis of the valve stem, and has a valve seat on the inner peripheral surface of the valve box where the peripheral edge of the valve body is slidably contacted. A thin sheet portion supported on the main body portion for opening and closing the flow path in the valve box; and a thin sheet portion disposed between the thin sheet portion and the main body portion to support the thin sheet portion on the main body portion. The thin sheet portion has a bent portion which is slidably in contact with the valve seat at a peripheral portion, and the sheet jack portion has a concave shape with the peripheral portion standing upright, and a thin plate is formed at the peripheral portion. A portion that supports a seat portion, wherein the main body portion faces a back surface of the seat jack portion; Has a recess in said collar is that so as to be positioned in these central position a between the thin sheet portion and the seat jack unit.

[0006]

According to the above construction, when a large load or the like is applied to the valve seat, the thin sheet portion responds by being elastically deformed, thereby suppressing seizure and malfunction of the valve body. Therefore, the bearing clearance for preventing image sticking and operation failure can be reduced.

Further, when the valve element receives a pressure in the reverse pressure direction (pressure from the valve stem side), the central portion of the thin sheet portion is largely deformed, and the collar for supporting the thin sheet portion at the center position. The collar portion presses the central portion of the seat jack portion. The pressed seat jack portion is deformed such that the center portion is indented into the concave portion of the main body portion, and the thin sheet portion is pressed in the positive pressure direction at the peripheral portion, and the outer surface of the thin sheet portion is pressed against the valve seat. . Since the thin sheet portion is pressed against the valve seat in this manner and the clearance is reduced as described above, the amount of leakage at the time of back pressure is reduced as compared with the related art.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. Since the schematic configuration of the high-temperature butterfly valve of the present invention is almost the same as the conventional one described with reference to FIG. 3, members having the same functions are denoted by the same reference numerals and description thereof will be omitted.

In FIG. 1, a valve body 4 includes a main body 9 connected to the valve stem 2, a thin sheet portion 10 supported on the main body 9 to open and close the flow path 3 in the valve box, and a main body 9. A seat jack portion 11 and a collar portion 12 are disposed between the thin sheet portion 10 and support the thin sheet portion 10 on the main body 9.

The thin sheet portion 10 is made of a thin metal plate having elasticity and has a bent portion 10a at the periphery thereof which is in sliding contact with the valve seat 5, and the seat jack portion 11 is formed of the peripheral portion 1a.
The thin sheet portion 10 is supported at a peripheral edge 11a in a concave shape in which the first sheet 1a is provided. The main body 9 has a concave portion 9a at a position facing the back surface of the seat jack portion 11, and the collar portion 12 is located between the thin sheet portion 10 and the seat jack portion 11, and the thin sheet portion 10 It is supported on the seat jack portion 11 at the center position.

In the above configuration, when a large load or the like acts on the valve seat 5, the thin sheet portion 10 having the bent portion 10a is easily elastically deformed to cope with the load and the like, 4 is prevented from burning or malfunction. Therefore, the bearing clearance for preventing image sticking and operation failure can be made smaller than before.

Next, the operation when the valve element 4 receives a pressure in the reverse pressure direction (pressure from the valve stem side) will be described with reference to FIG. When a pressure in the counter pressure direction 7 acts on the valve body 4, the central portion of the thin sheet portion 10 is greatly depressed in the counter pressure direction 7, and this deformation is transmitted to the collar portion 12 supporting the thin sheet portion 10 at the center position. The part 12 presses the central part of the seat jack part 11. The pressed sheet jack portion 11 is deformed such that the center portion is indented into the concave portion 9a of the main body portion 9, and the thin sheet portion 10 is formed at the peripheral portion 11a.
Is pressed in the positive pressure direction. As a result, the peripheral portion 10 a of the thin sheet portion 10 is pressed against the valve seat 5. Since the thin sheet portion 9 is pressed against the valve seat 5 by the pressure as described above and the clearance is reduced as described above, the leakage amount at the time of the back pressure is reduced.

[0013]

As described above, according to the present invention, the valve body is constituted by supporting the thin sheet portion for opening and closing the flow path in the valve box on the main body portion by the seat jack portion and the collar portion. When a large load is applied to the device or when a back pressure is applied, the elastic deformation of the thin sheet portion can cope with the problem, and it is possible to suppress seizure and malfunction of the valve body and reduce the amount of leakage at the time of the back pressure.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a seat structure of a high-temperature butterfly valve according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a principal part explaining the operation of the seat structure of the high-temperature butterfly valve of FIG. 1;

FIG. 3 is a cross-sectional view showing a configuration of a conventional high-temperature butterfly valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve box 2 Valve stem 3 Flow path in valve box 4 Valve element 5 Valve seat 9 Main body part 10 Thin sheet part 11 Seat jack part 12 Collar part 9a Concave part 10a Bent part 11a Peripheral part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16K 1/00-1/54

Claims (1)

(57) [Claims] 1. A valve body that rotates about the axis of a valve stem and opens and closes a flow path in a valve box is provided at a position eccentric from the axis of the valve stem, and a peripheral portion of the valve body is provided on the inner peripheral surface of the valve box. Is a seat structure of a high-temperature butterfly valve provided with a valve seat that is in sliding contact with the valve body, wherein the valve body has a main body connected to a valve rod, and a thin sheet supported on the main body to open and close a flow path in a valve box. And a seat jack portion and a collar portion that are disposed between the thin sheet portion and the main body portion and that support the thin sheet portion on the main body portion, and the thin sheet portion slides on a peripheral edge portion of the valve seat. The seat jack has a concave shape with a peripheral portion standing upright, the thin portion supports the thin sheet portion at the peripheral portion, and the main body has a concave portion at a portion facing the back surface of the seat jack portion. And
The seat structure of a high-temperature butterfly valve, wherein the collar portion is located between the thin sheet portion and the seat jack portion and at a central position therebetween.