JPH1122832A - Butterfly valve equipped with purge device to valve box seat part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a butterfly valve equipped with a purge device having an enhanced purging performance simply with easiness in the operation. SOLUTION: A valve box seat part 5 equipped with a plurality of purge fluid jetting holes 6A penetratively for spouting a purge fluid F to the contacting/separating surface 5A of a valve body seat part is installed removably on the inside surface of a valve box 2 with the aid of a fastening member 9, wherein a purge device 6 is formed from a plurality of purge fluid jetting holes 6A, a plurality of purge fluid passages 6C penetrating the valve box 2 in communication with the inlets of the jetting holes 6A, and a purge fluid supplying part 6B which is provided in communication with the inlets to the purge fluid passages 6C. When the purging performance of the purge device 6 is to be heightened, the existing valve box seat part 5 can be replaced with a valve box seat part 5 having different number, bore, and inclination angle of the purge fluid jetting holes 6A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a butterfly valve provided with a device for purging a valve box seat.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 2 to 4, a valve body 1 is mounted on a valve stem 3 having an axis C2 intersecting with an axis C1 of a valve box 2, and the valve stem 3 is mounted together with the valve stem 3. The valve body sheet part 4 on the outer periphery of the valve body 1 comes into contact with and separates from the valve box seat part 5 on the inner periphery of the valve body 2 by the rotation of the valve rod 3 and the valve body 1. If the passing fluid contains a large amount of fine solids x, such as dust, in the butterfly valve configured to open and close by opening and closing, the valve sheet seat portion contacting / separating surface of the valve box seat portion 5 with time. 5A
When the valve body 1 is fully closed, fine solid matter x such as dust is deposited on the valve body sheet portion 4 and the valve body sheet portion 5.
Interposed between the valve seat contact / separation surface 5A and the valve body sheet part 4 and the valve seat seat contact / separation surface 5A to prevent proper close contact, and the sealing performance when the butterfly valve is fully closed. Will be reduced.

[0003] Therefore, a valve body seal in the valve box seat portion 5 is provided.
A plurality of purge fluid injection holes 6A for injecting the purge fluid F (for example, high-pressure air) toward the contact portion separation surface 5A
Are provided at equal intervals in the circumferential direction (however, only one purge fluid ejection hole 6A is shown in the drawing), and the purge fluid ejection holes 6A communicate with the respective inlets of the purge fluid ejection holes 6A. 6b attached to the outer periphery of the valve box 2
1 and a purge fluid supply section 6B composed of a purge fluid supply pipe 6b2 for supplying a purge fluid F from a purge fluid supply source 7 to the duct section 6b1. Provided with a butterfly valve.

In the butterfly valve configured as described above,
By opening the valve V provided on the purge fluid supply pipe 6b2, the purge fluid F is supplied from the purge fluid supply source 7 to the purge fluid supply pipe 6b2 in the purge fluid supply section 6B.
→ The fluid flows into the purge fluid injection hole 6A through the path of the duct 6b1, and is injected from this into the valve body sheet contact / separation surface 5A of the valve box seat 5, so that the dust contained in the passing fluid The fine solid matter x such as the valve box sheet part 5
Can be prevented from accumulating on the side of the valve body sheet contact / separation surface 5A.

On the other hand, in the butterfly valve provided with the purging device 6, when it is desired to increase the purging performance of the purging device 6 by increasing the amount of fine solids x such as dust contained in the passing fluid. There is. This request can be met by changing the number, diameter, inclination angle, etc. of the purge fluid injection holes 6A. But,
In the butterfly valve provided with the conventional purging device 6, since a plurality of purge fluid injection holes 6A are provided through the valve box 2, it is extremely difficult to change the number, diameter, inclination angle, and the like of the butterfly valve. Have bad drawbacks.

[0006]

That is, in a conventional butterfly valve provided with a purging device for a valve seat portion, the number, diameter, inclination angle, and the like of purge fluid injection holes are adjusted according to a demand for enhancing purging performance. Very difficult to change,
It has the disadvantage of poor workability. Therefore, the present invention is intended to improve the purging performance of the purging device,
It is an object of the present invention to provide a butterfly valve provided with a purge device for a valve box seat part, which can improve workability easily and improve performance as required.

[0007]

In order to achieve the above-mentioned object, the present invention provides a valve element which is attached to a valve stem having an axis intersecting with the axis of a valve box, and rotates around the axis together with the valve stem. It is housed in a valve box as much as possible, and the valve body sheet portion on the outer periphery of the valve body contacts and separates from the valve box seat portion mounted on the inner periphery of the valve box to open and close by rotation of the valve body. A butterfly valve provided with a purge device for injecting a purge fluid toward the valve body sheet contacting / separating surface of the valve box seat portion, wherein the purge fluid injection hole of the purge device is penetrated. A box sheet portion is detachably attached to an inner periphery of the valve box by a fastening member, the purge fluid injection hole, a purge fluid passage communicating with an inlet of the purge fluid injection hole and penetrating through the valve box, It was provided in communication with the inlet of this purge fluid passage. It is characterized by constituting the purging device in the over-di fluid supply.

According to the present invention, it is possible to meet the demand for improving the purging performance of the purging device by exchanging the valve box seat portion provided with the purging fluid injection holes having different numbers, diameters, and inclination angles.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged sectional view showing a main part of the present invention. The overall configuration and operation of the butterfly valve except for the main part in FIG. 1 are not different from those of the conventional example shown in FIGS. Therefore, the same reference numerals are given to the same or corresponding parts as in the conventional example, and the detailed description is omitted. In FIG. 1, two substantially semicircular valve box seat parts 5 are prepared, these are divided and arranged in the circumferential direction, and a fastening member 9 composed of a plurality of bolts is provided via a gasket 8. It is detachably attached to the inner periphery of the valve box 2.
A plurality of purge fluid injection holes 6A for injecting a purge fluid F (for example, high-pressure air) toward the valve body sheet contact / separation surface 5A are formed in the valve box seat portion 5 at equal circumferential intervals. (However, only one purge fluid injection hole 6A is shown in the drawing).

The purge device 6 includes a plurality of purge fluid injection holes 6A, a purge fluid passage 6C penetrating through the valve box 2 in communication with the inlets of the purge fluid injection holes 6A, and a purge fluid passage 6C. The purge fluid supply unit 6B is connected to the inlet of the purge fluid passage 6C and attached to the outer periphery of the valve box 2, and the purge fluid supply unit 6B is connected to the purge fluid supply unit 6B. And a purge fluid supply pipe 6b2 for supplying a purge fluid F from a purge fluid supply source 7. In addition, the gasket 8 includes
The plurality of purge fluid injection holes 6A and the plurality of purge fluid passages 6
C and a passage 8A for communicating with each other.

With such a configuration, the purge fluid F is supplied from the purge fluid supply source 7 to the purge fluid supply section 6B by opening the valve V provided in the purge fluid supply pipe 6b2. Supply pipe 6b2 → duct part 6b
1 → purge fluid passage 6C → passage 8A of gasket 8 flows into purge fluid injection hole 6A and is injected from here toward valve body sheet contacting / separating surface 5A of valve box seat portion 5. It is possible to prevent fine solids x such as dust contained in the passing fluid from accumulating on the valve body sheet contacting / separating surface 5A side of the valve box sheet portion 5 with time.

On the other hand, if there is a demand to increase the purging performance of the purging device 6 due to an increase in the amount of fine solids x such as dust contained in the passing fluid, the valve member sheet portion by the fastening member 9 is required. 5 is released, the valve box seat portion 5 is taken out of the valve box 2, and the valve box seat portion 5 having the number, diameter, inclination angle, etc. of the purge fluid injection holes 6A according to the demand is separately prepared. The valve box sheet portion 5 is detachably attached to the inner periphery of the valve box 2 by the fastening member 9 via the gasket 8, so that it is possible to meet a demand for improving the purging performance of the purge device 6.

That is, the number, diameter, inclination angle, and the like of the purge fluid injection holes 6A with respect to the valve box seat portion 5 can be easily processed and changed as required, and the valve box seat portion with respect to the valve box 2 can be changed. Since the attachment / detachment 5 can be easily performed, even if there is a demand for improving the purging performance, the workability corresponding to the request is greatly improved.

[0014]

As described above, according to the present invention, when it is desired to enhance the purging performance of the purging device, the number, diameter and inclination of the purge fluid injection holes can be reduced by a simple operation of replacing the valve box seat portion. Angles and the like can be easily changed as required, and workability can be improved.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing an embodiment of a main part of the present invention.

FIG. 2 is a front view of a conventional butterfly valve.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an enlarged sectional view showing a conventional purge device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve body 2 Valve box 3 Valve rod 4 Valve body seat part 5 Valve box seat part 5A Valve body sheet contacting / separating surface 6 Purge device 6A Purge fluid injection hole 6B Purge fluid supply part 6C Purge fluid passage C1 Valve box axis C2 Valve stem axis F Purging fluid

Claims (1)

[Claims] 1. A valve body is mounted on a valve stem having an axis intersecting the axis of a valve box, and is housed in the valve box so as to be rotatable around the axis together with the valve stem, and the valve is rotated by rotation of the valve body. The valve seat at the outer periphery of the valve body is configured to open and close by contacting and separating from a valve box seat attached to the inner periphery of the valve box, and the valve seat at the valve box seat is provided. In a butterfly valve provided with a purge device for injecting a purge fluid toward a part contacting / separating surface, a valve box seat portion penetrating a purge fluid injection hole of the purge device is detachably attached to an inner periphery of the valve box by a fastening member. A purge fluid injection hole, a purge fluid passage communicating with an inlet of the purge fluid injection hole, and penetrating through the valve box, and a purge fluid supply unit provided in communication with an inlet of the purge fluid passage. And the purging device is constituted by A butterfly valve comprising a purge device for a valve box seat portion.