JPH08178104A - Valve seat of breather valve and the like - Google Patents

Abstract

PURPOSE: To easily, certainly and strongly screw a valve seat on a valve seat holder and to prevent leakage of fluid by forming a jig engagement groove for valve seat screwing on an inwall of the valve seat. CONSTITUTION: A through hole 2 is formed on a center of a valve seat 1, and jig engagement vertical grooves 4 for valve seat screwing passing through from top to bottom in the vertical direction are formed on two points facing against an inwall 3 on which the through hole 2 is formed. It is favourable that the number of the jig engagement vertical grooves 4 on the inwall 3 is two or four facing against the inwall 3, but it is not restricted to these numbers. A lower part 1a of the valve seat 1 is formed circular and smaller than an upper part 1b, and a male screw 6 is threaded on a lower part outer peripheral surface 5. An upper end 13 of the valve seat 1 is formed flat all over the circumference. A valve body is placed on the upper end 13 of the valve seat 1 by way of making contact with each other on their surfaces and a contact area of this valve body and the valve seat 1 becomes extensive, and it is possible to prevent leakage of fluid from a contact part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve seat such as a breather valve attached to a chemical tank or the like.

[0002]

2. Description of the Related Art Generally, in a blizzer valve attached to a chemical tank or the like, a valve body can be moved up and down on a valve seat provided in the blister valve body in order to open and close the passage formed in the blister valve body. The valve body is operated by the differential pressure of the air blown from the tank, and the internal passage of the valve seat that contacts the valve body is opened to avoid the risk of tank explosion.

A conventional valve structure provided in the passage formed in the blister valve body is, for example, Japanese Utility Model Application No. 3-65.
No. 885, a valve seat mounting block is provided in a predetermined passage in the blizzer valve body, and an internal thread is formed on an upper inner wall of the valve seat mounting block, and the internal thread portion of the valve seat mounting block is further formed. Further, a valve seat having a male screw formed on the outer circumference of the lower portion is screwed to attach the valve seat to the valve seat mounting block, and the valve body is placed on this valve seat.

Further, in the valve structure disclosed in Japanese Patent Laid-Open No. 4181075, a valve seat mounting block is provided in a predetermined passage formed in the blister valve body, and a female screw is formed on an upper inner wall surface of the valve seat mounting block. A valve seat holder having a male thread formed on the lower periphery is screwed onto the female screw portion of the valve seat mounting block, and the valve seat holder is provided on the valve seat mounting block. Further, a valve seat having a male screw formed on the lower outer periphery is screwed to a female screw portion formed on the upper inner peripheral surface of the valve seat holder, and the valve seat is attached to the valve seat mounting block via the valve seat holder. The valve element is mounted on this valve seat.

[0005]

However, in the valve seat in the above-mentioned conventional valve structure of the blister valve, the valve seat is provided in the valve seat mounting block or the valve seat mounting block. When it is screwed onto the valve seat, it is difficult to firmly attach the valve seat to the valve seat mounting block or the valve seat holder because the valve seat is held by hand and screwed into the valve seat mounting block or the valve seat holder.

Therefore, there is a concern that a minute gap may be formed between the valve seat mounting block or the valve seat holder and the bottom surface of the valve seat, and the fluid may leak from the gap. Further, since the valve seat mounting work is performed by gripping the valve seat with the hand as described above, mounting or dismounting is very difficult.

Further, in the conventional valve seat, since the upper end portion of the valve seat on which the valve body is mounted is formed to have an acute angle or a curved surface so as to make line contact with the valve body, the valve body and the valve seat. There is also a problem that a fluid leak occurs at the contact portion with.

The present invention has been developed in view of the above points, and an object of the present invention is to simply and easily attach a valve seat to a valve seat mounting block or a valve seat holder provided in the valve seat mounting block. A purpose of the present invention is to provide a valve seat such as a breather valve that can be firmly and firmly screwed and that can prevent fluid leakage from a contact portion between the valve body and the valve seat.

[0009]

In order to achieve the above object, the present invention has the following construction. That is, a valve seat such as a breather valve according to claim 1 of the present invention is a valve seat mounting block provided in a predetermined passage in a valve body opened and closed by a valve body or a valve seat holder provided in the valve seat mounting block. In a valve seat that is detachably screwed, a jig engaging groove for threading the valve seat is formed on the inner wall of the valve seat.

A valve seat such as a breather valve according to a second aspect of the present invention is a valve seat mounting block provided in a predetermined passage in a valve body opened and closed by a valve body or a valve provided in the valve seat mounting block. In a valve seat that is detachably screwed to a seat holder, a jig engaging vertical groove for screwing the valve seat is formed at at least two positions facing each other on the inner wall of the valve seat.

A valve seat such as a breather valve according to a third aspect of the present invention is provided in a valve seat mounting block or a valve seat mounting block provided in a predetermined flow passage in a valve body opened and closed by a valve body. In a valve seat that can be detachably screwed to a valve seat holder, the upper end of the valve seat is formed flat,
The structure according to claim 1 or 2, wherein the valve body can be mounted on the valve seat such that the valve body is in surface contact with the valve seat.

[0012]

In the valve seat such as the breather valve according to the first aspect, the inner surface of the valve seat mounting block provided in the predetermined flow passage in the valve body opened and closed by the valve body or the valve seat holder provided in the valve seat mounting block is provided. First, screw the tip of the thread groove formed on the valve seat into the thread groove formed on the inner surface, and then turn the valve seat to attach it to the valve seat mounting block or the valve seat holder provided on the valve seat mounting block. The valve seat is securely and strongly seated on the valve seat mounting block or valve seat mounting block by engaging the predetermined jig with the jig engaging groove of the valve seat and turning the jig. It can be screwed to the valve seat holder provided on the. From the beginning, engage the jig with the jig engagement groove of the valve seat, and turn the jig to screw it onto the valve seat mounting block or the valve seat holder provided on the valve seat mounting block. May be.

Also, when the strongly seated valve seat is removed from the valve seat mounting block or the valve seat holder provided in the valve seat mounting block for replacement, the jig is engaged with the jig engaging groove of the valve seat. Then, by rotating this jig in the reverse direction, the valve seat, which is strongly screwed, can be easily removed.

Further, in the valve seat such as the breather valve of the above-mentioned claim 2, since the jig engaging vertical groove for screwing the valve seat is formed at least at two positions facing each other on the inner wall of the valve seat, for example, By engaging both vertical ends of a rectangular plate-shaped jig with the jig engaging vertical grooves facing each other, and rotating the valve seat through the jig as described above, the valve seat mounting block Alternatively, it can be strongly screwed to a valve seat holder provided on the valve seat mounting block. Even when replacing the valve seat, by engaging the above jigs in the jig engaging vertical grooves facing each other and rotating them in reverse,
It can easily be removed from the valve seat mounting block or the valve seat holder screwed onto the valve seat mounting block.

Further, in the valve seat such as the breather valve of the above-mentioned claim 3, the valve seat has the function of the above-mentioned claim 1 or claim 2, and the upper end of the valve seat is formed flat so that the valve body faces the valve seat. Since they can be placed in contact with each other, it is possible to prevent leakage from the contact portion between the valve body and the valve seat.

[0016]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2 show a valve seat 1 of an embodiment according to the present invention, FIG. 1 is a vertical sectional view taken along the line AA of FIG. 2, and FIG. 2 is a plan view. This valve seat 1 has a through hole 2 formed at the center, and a jig engaging for threading a valve seat that penetrates vertically from top to bottom at two opposing positions of the inner wall 3 in which the through hole 2 is formed. A vertical groove 4 is formed. The jig engaging vertical groove 4 is formed in a quadrangular cross section.
As shown in FIG. 4, it may be formed in a semi-circular shape, or may be formed in a triangular shape as shown in FIG. 4, or may be formed in various other shapes, as long as a jig for rotating the valve seat 1 can be engaged. You may form in a cross-sectional shape. In addition, the jig engaging vertical groove 4
May be formed partway in the inner wall 3 having the through hole 2 as shown in FIG. Also, the jig engaging vertical groove 4
The number of the inner walls 3 formed on the inner wall 3 is preferably 2 or 4 facing each other, but is not limited to this number.

The valve seat 1 has a lower portion 1a having a smaller diameter than that of the upper portion 1b, and a male screw 6 is threaded on the outer peripheral surface 5 of the lower portion. The male screw 6 portion is a female screw 9 threaded on the upper inner peripheral surface 8 of the valve seat mounting block 7 shown in FIGS. 6 and 7, or a valve seat screwed to the valve seat mounting block 7 shown in FIGS. 8 and 9. The holder 10 is screwed into an internal thread 12 which is threaded on the upper inner peripheral surface 11.

Further, the upper end 13 of the valve seat 1 described above is formed flat over the entire circumference, and as shown in FIG. 10, its flat width dimension (X dimension in the figure) is about 0.3 to 1.0 mm. Has been formed. By flattening the upper end 13, the valve body 14 shown in FIG. 7 or 9 is placed in surface contact with the upper end 13 of the valve seat 1, and the contact area between the valve body 14 and the valve seat 1 is placed. Can be widened, and leakage of fluid from the contact portion can be reliably prevented.

The valve seat 1 formed as described above is provided in the internal passages 23 and 24 in the valve body shown in the blister valves 21 and 22 (see FIGS. 7 and 9). That is, it is screwed to the valve seat mounting block 7 or the valve seat holder 10 screwed to the valve seat mounting block 7 by the jig 15 shown in FIG. The jig 15 is a rectangular metal plate member, and is bent and formed so that the upper end thereof can be easily gripped. Both side vertical ends 16 of the jig 15 are used by engaging with both jig engaging vertical grooves 4 of the valve seat 1 as shown in FIG.

That is, when the valve seat 1 is screwed to the valve seat mounting block 7 (or the valve seat holder 10), as an example of use, first, the valve seat 1 is first manually attached to the male screw 6 of the lower portion 1a of the valve seat 1. The portion is screwed into the female screw 9 of the valve seat mounting block 7 (or the valve seat holder 10), and the valve seat 1 is slightly turned by hand to be advanced. Next, the jig 15 is engaged with the jig engaging vertical groove 4 of the valve seat 1, and the valve seat 1 is further screwed by the jig 15 to further advance the valve seat mounting block 7 (or the valve seat). Firmly screw it into the holder 10).

As a result, as shown in FIGS. 6, 8 and 12, the lower end 1c of the valve seat 1 and the middle lower surface 1d become the inner upper surface 7a of the valve seat mounting block 7 (or the valve seat holder 10).
(10a) and the upper end surface 7b (10b) strongly adhere,
It is possible to prevent fluid leakage from this contact portion. Further, the lower end 10c of the valve seat holder 10 firmly adheres to the inner upper surface 7a of the valve seat mounting block 7, and the middle lower surface 10d of the valve seat holder 10 strongly adheres to the upper end surface 7b of the valve seat mounting block 7.

Further, both the valve seat 1 and the valve body 14 may be made of Teflon, or one of them may be made of Teflon. Alternatively, both may be formed of a metal material such as stainless steel. When a non-metal material is used as the material of the valve seat 1 or the valve element 14, the inorganic material is preferably a carbon material or a ceramic material. As the organic material, polypropylene resin, polyvinyl chloride resin, silicone resin, phenol resin, epoxy acrylate resin, epoxy resin, polyester resin, fluororesin are preferable, and if necessary, a reinforcing agent such as glass fiber may be added to these resins. It is preferable to replenish.

The valve element 17 shown in FIG. 13 is used for a low pressure valve having a differential pressure of 50 mmAq to 70 mmAq, and the valve element 18 shown in FIGS. 14 and 15 has a differential pressure of 100.
Used for high pressure valves of mmAq to 300 mmAq. The valve body 18 of the high pressure valve is composed of an upper valve body 19 and a lower valve body 20, and the flanged upper end 20a of the lower valve body 20 is connected to the upper valve body 1
9 is engaged with an engagement space portion 19a formed at the lower end portion of the shaft 9 so that the flanged upper end 20a can move up and down in the engagement space portion 19a when the lower valve body 20 moves up and down during a small differential pressure operation. There is.

When the valve seat 1 is deteriorated, it can be easily removed from the valve seat mounting block 7 or the valve seat holder 10 by the jig 15.

[0025]

As is apparent from the above description, in the valve seat such as the breather valve according to the first aspect of the present invention, the jig engaging groove for threading the valve seat is formed on the inner wall of the valve seat. Therefore, the valve seat can be screwed onto a valve seat mounting block provided in a predetermined passage in the valve body that opens and closes by the valve body or a valve seat holder provided in the valve seat mounting block, or from these blocks or holders. When removing the jig, the jig is engaged with the jig engaging groove of the valve seat and the jig is rotated, so that the jig can be firmly screwed firmly or easily removed.

Further, since the valve seat can be strongly screwed to the valve seat mounting block or the valve seat holder provided on the valve seat mounting block, the contact surface between the valve seat and the valve seat mounting block or the valve seat holder also comes into close contact. However, it is possible to reliably prevent the fluid from leaking from this portion.

Further, in the valve seat such as the breather valve according to the second aspect of the present invention, the jig engaging vertical groove for threading the valve seat is formed at at least two positions facing each other on the inner wall of the valve seat. Because
By engaging a flat jig or a metal plate with the jig engaging vertical grooves facing each other, the valve seat can be easily rotated to be attached to and detached from the valve seat mounting block and the valve seat holder.

Further, in the valve seat such as the breather valve according to the third aspect of the present invention, the valve seat can be mounted so that the upper end of the valve seat is formed flat so that the valve body is in surface contact with the valve seat. It is possible to reliably prevent leakage from the contact portion between the body and the valve seat.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a valve seat of an embodiment according to the present invention.

FIG. 2 is a plan view of a valve seat according to an embodiment of the present invention.

FIG. 3 is a plan view of a valve seat of another embodiment according to the present invention.

FIG. 4 is a plan view of a valve seat of another embodiment according to the present invention.

FIG. 5 is a vertical sectional view of a valve seat of another embodiment according to the present invention.

FIG. 6 is an exploded vertical sectional view showing a valve seat and a valve seat mounting block of an embodiment according to the present invention.

FIG. 7 is a vertical cross-sectional view of a blizzer valve according to an embodiment of the present invention.

FIG. 8 is an exploded vertical sectional view showing a valve seat, a valve seat holder, and a valve seat mounting block of an embodiment according to the present invention.

FIG. 9 is a vertical cross-sectional view of a blister valve of another embodiment according to the present invention.

FIG. 10 is an enlarged cross-sectional explanatory view of the upper end of the valve seat of the embodiment according to the present invention.

FIG. 11 is a perspective view of a jig according to an embodiment of the present invention.

FIG. 12 is a vertical cross-sectional explanatory view showing a use state in which a valve seat is attached to a valve seat attachment block by a jig.

FIG. 13 is a vertical sectional view of a valve body of another embodiment.

FIG. 14 is a longitudinal sectional view of an upper valve body of a valve body of another embodiment.

FIG. 15 is a vertical cross-sectional view of a lower valve body of a valve body of another embodiment.

[Explanation of symbols]

 1 valve seat 3 inner wall 4 jig engaging groove (vertical groove) 7 valve seat mounting block 10 valve seat holder 13 upper end 14 valve body 24 passage

Claims (3)

[Claims] 1. A valve seat, which is detachably screwed to a valve seat mounting block provided in a predetermined passage in a valve body opened and closed by a valve body or a valve seat holder provided in the valve seat mounting block, A valve seat, such as a breather valve, characterized in that a jig engaging groove for threading the valve seat is formed on the inner wall of the valve seat. 2. A valve seat detachably screwable to a valve seat mounting block provided in a predetermined passage in a valve body opened and closed by a valve body or a valve seat holder provided in the valve seat mounting block, A valve seat such as a breather valve characterized in that a jig engaging vertical groove for threading the valve seat is formed at least at two positions facing each other on the inner wall of the valve seat. 3. A valve seat which is detachably screwed to a valve seat mounting block provided in a predetermined passage in a valve body which is opened and closed by a valve body or a valve seat holder provided in the valve seat mounting block. The valve seat such as the breather valve according to claim 1 or 2, wherein the valve seat has an upper end formed flat so that the valve body can be mounted on the valve seat so as to be in surface contact with the valve seat.