JP3217263B2 - Butterfly valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a butterfly valve having a simple structure and high sealing performance.

[0002]

2. Description of the Related Art A conventional butterfly valve is shown in FIG. This is because a valve body 2 is rotatably disposed in a valve box 1 via a valve rod 3, and a pair of left and right peripheral seal portions 4, 4 in contact with the outer peripheral edge of the valve body 2 are provided on the inner surface of the valve box 1. When,
Hub seat portions 5 and 5 which are fitted to the valve stem 3 are provided. By rotating the valve stem 3 forward and backward, the valve body 2 can be opened and closed.

[0003] The hub seat portions 5, 5 are shown in FIGS.
As shown in the figure, a ring-shaped core 5a and the core 5a
And a coating portion 5b made of an elastic material such as rubber, which is coated on the outer peripheral surface of the recording medium.

[0006] The peripheral seal portions 4, 4 are shown in FIGS. 6 and 8.
As shown in the figure, the sheet body 4 made of an elastic material such as rubber
a and an edge 4b formed integrally with both end edges of the seat body 4a and abutting against the outer peripheral surfaces of the hub seat portions 5, 5.
It is composed of

[0005]

In the above-mentioned conventional configuration,
The peripheral seal portions 4 and 4 and the hub seat portions 5 and 5 are independent of each other, and in order to seal a joint between the two portions 4 and 5, the edge portions 4b of the peripheral seal portions 4 and 4 are connected to the hub seat portions 5 and 4. 5, the edge 4b of the peripheral seal portions 4, 4 is pressed against the hub sheet portions 5, 5, but in this case, an adhesive is applied or the edge 4b is pressed.
It takes time and effort to assemble with a pressing force applied, and the operation is inferior.

In view of the above problems, an object of the present invention is to provide a butterfly valve having a simple structure and high sealing performance.

[0007]

To achieve the above object, according to the present invention, a valve body is rotatably disposed via a valve rod in a valve box, and an inner surface of the valve box is provided. In a butterfly valve provided with a peripheral seal portion in contact with the outer peripheral edge of the valve element and a hub seat portion fitted to the valve stem, the peripheral seal portion and the hub seat portion are integrally formed, and the pair of peripheral seals are formed.
A concave groove is formed along the circumferential direction between the base ends of the edge seals.
At the same time, the base end of the peripheral seal is formed on the inner surface of the valve box.
When fitted into the annular recess formed,
Form a bottleneck at the constriction, provide a filler inlet and an air outlet that penetrate the valve box and penetrate the concave and concave grooves, fill the concave groove with the filler through the filler inlet, and fill the filler. It is characterized in that it is used as the core material of the peripheral sealing portion.

In the above configuration, the valve element can be opened and closed by rotating the valve stem forward and backward. in this case,
Since the peripheral seal portion and the hub seat portion are integrally formed, the structure is simple and the manufacturing cost is low. In addition, after the peripheral seal portion is set on the inner surface of the valve box, the valve stem may be inserted into the hub seat portion and the valve stem may be connected to the valve body, so that the assembling operation can be easily performed. In addition, there is no risk of water leaking from between the peripheral sealing portion and the hub seat portion, and the sealing performance is excellent.

[0009]

According to the above configuration, the peripheral seal portion can be securely fixed to the valve box by the filler filled in the concave groove, and the filler serves as a core material of the peripheral seal portion.
Since the peripheral seal portion is not deformed more than necessary, the outer peripheral edge of the valve body can be securely pressed against the peripheral seal portion, and the sealing performance can be further improved.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a butterfly valve according to an embodiment of the present invention.
Are rotatably disposed via the valve rod 3, and are provided on the inner surface of the valve box 1 with peripheral seal portions 14, 14 in contact with the outer peripheral edge of the valve element 2.
And a hub seat portion 15 that is fitted to the valve stem 3. The valve body 2 can be opened and closed by rotating the valve stem 3 forward and reverse.

As shown in FIGS. 2 and 3, the peripheral seal portions 14, 14 and the hub seat portions 15, 15 are integrally formed of an elastic material such as rubber, and as shown in FIG. Is fitted into an annular concave portion 16 formed on the inner surface of the valve box 1.

Further, concave grooves 14b, 14b are formed in the outer peripheral surfaces of the peripheral seal portions 14, 14 along the longitudinal direction of the peripheral seal portions 14, 14, and as shown in FIG.
When the portion 14a is fitted into the recess 16
The constricted portion 14c that forms a bottleneck in the b
Filler inlets 17 and air outlets 18 are formed on opposing inner wall surfaces of the grooves 4b and 14b and penetrate the valve box 1 and communicate with both ends of the concave grooves 14b and 14b. A filler 19 made of a synthetic resin such as a thermosetting resin is filled into the concave grooves 14b, 14b from the inlet 17, and
The air in the concave grooves 14b, 14b is discharged from the air discharge port 18, and the plugs 20, 21 are screwed into the both ports 17, 18, thereby hardening the filler 19.

According to the above configuration, the peripheral edge seal portions 14, 1
Since the hub seat portion 15 and the hub seat portions 15 are integrally formed, no water leakage occurs between the two portions 14 and 15, so that the structure is simple and the manufacturing cost is low.

The peripheral seal portions 14, 14 can be securely fixed to the valve box 1 by the filler 19 filled in the concave grooves 14b, 14b. Core material, and the peripheral seal portion 1
Since the outer peripheral portions 4 and 14 are not deformed more than necessary, the outer peripheral edge of the valve element 2 can be reliably pressed against the peripheral edge seal portions 14 and 14, and the sealing performance can be further improved.

When assembling the butterfly valve, the base end portion 14a of the peripheral seal portions 14, 14 is fitted into the annular concave portion 16 of the valve box 1, and then the valve stem 3 is connected to the hub seat portions 15, 1.
5 and the valve stem 3 is connected to the valve body 2 by the connecting tool 22.
And the grooves 14b, 14
After filling the filler 19 into the filler b, the plugs 20 and 21 may be screwed into the filler inlet 17 and the air outlet 18.
The assembling work can be easily performed.

[0017]

According to the first aspect of the present invention, since the peripheral seal portion and the hub seat portion are integrally formed, water leakage does not occur between the peripheral seal portion and the hub seat portion, and the structure is reduced. Easy and low production cost. In addition, after the peripheral seal portion is set on the inner surface of the valve box, the valve stem may be inserted into the hub seat portion and the valve stem may be connected to the valve body, so that the assembling operation can be easily performed.

According to the second aspect of the present invention, the peripheral seal portion can be securely fixed to the valve box by the filler filled in the concave groove, and the filler becomes a core material of the peripheral seal portion, Since the peripheral seal portion is not deformed more than necessary, the outer peripheral edge of the valve body can be securely pressed against the peripheral seal portion, and the sealing performance can be further improved.

[Brief description of the drawings]

FIG. 1 is a half sectional front view of a butterfly valve according to an embodiment of the present invention.

FIG. 2 is a half sectional front view of the peripheral edge seal portion and the hub seat portion.

FIG. 3 is a partially cutaway plan view of the peripheral edge seal portion and the hub seat portion.

FIG. 4 is a cross-sectional view of the main part.

FIG. 5 is a half sectional front view showing a conventional butterfly valve.

FIG. 6 is a half sectional front view of the peripheral edge seal portion and the hub seat portion.

FIG. 7 is a half sectional plan view of the hub seat portion.

FIG. 8 is a half sectional plan view of the peripheral edge sealing portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve box 2 Valve body 3 Valve rod 14 Peripheral seal part 14b Groove 15 Hub seat part 19 Filler

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-6-11049 (JP, A) JP-A-60-81576 (JP, A) JP-A-8-128538 (JP, A) JP-A 57-110 173672 (JP, A) JP 4-50467 (JP, B2) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16K 1/16-1/226

Claims (1)

(57) [Claims] 1. A valve body is rotatably disposed in a valve box via a valve rod, a peripheral seal portion in contact with an outer peripheral edge of the valve element on an inner surface of the valve box, and a hub seat externally fitted to the valve rod. The peripheral seal portion and the hub seat portion are formed integrally with each other , and a base of the pair of peripheral seal portions is provided.
While forming a concave groove along the circumferential direction between the ends,
An annular recess with the base end of the peripheral seal formed on the inner surface of the valve box
When fitted into the groove, the constriction in the groove causes a bottleneck.
A passage is formed, a filler inlet and an air outlet are provided through the valve box and through the recess and the groove, the filler is filled into the groove through the filler inlet, and the filler is filled into the peripheral seal portion. Butterfly valve characterized by a core material.