JPH0218854Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a gate valve.

[Conventional technology]

Conventionally, a gate valve is equipped with a valve body consisting of a pair of half-valve bodies that move forward and backward in a direction perpendicular to the axis of the flow path of the valve box. A pair of fixed valve seats were brought into contact with each other to seal the flow path.

[Problem that the invention attempts to solve]

Therefore, when the dimensional accuracy of the pair of valve seats is not good, the adhesion of the valve body to the valve seat is not good.

This invention solves these conventional problems and
It is an object of the present invention to provide a gate valve which improves the adhesion of a valve body to a valve seat and which does not cause rattling in the surface direction when the valve half bodies are overlapped.

[Means for solving problems]

The gate valve of the present invention is equipped with a valve body consisting of a pair of valve halves that move forward and backward in a direction perpendicular to the axis of a flow path of a valve box, and has a contact surface that protrudes into a slightly rounded shape; A pair of first abutting protrusions each having a first abutting protrusion having an inner surface curved in an arc shape and a first abutting plane part continuously formed on the inner surface of the abutting protrusion.
an abutment member is formed on the inner surface of one of the valve halves at a predetermined interval, and further includes a second abutment plane portion that abuts the abutment surface of the first abutment protrusion, and the first abutment plane. a pair of second abutting members comprising a second abutting protrusion having a slightly rounded abutting surface that abuts the inner surface and a second abutting protrusion having an arcuate outer surface that fits into the inner surface; , are formed at predetermined intervals on the inner surface of the other valve half body.

[Effect]

With the above configuration, when the valve half bodies are overlapped, the arcuately curved inner surface of the first abutting protrusion and the arcuately curved outer surface of the second abutting protrusion fit together. Therefore, the valve half body does not shift in its surface direction, that is, vertically, horizontally, or horizontally. Further, since the flat portion and the contact surface protruding in a rounded shape are brought into contact with each other, the valve half body can be slightly swung in correspondence with the valve seat.

〔Example〕

Hereinafter, the present invention will be explained in detail based on drawings showing embodiments.

In FIGS. 1 and 2, 1 is a valve box having a flow path 2, and 3 is a valve that moves forward and backward in a direction orthogonal to the axis 6 of the flow path 2 as a valve stem 5 rotates by rotating a handle 4. body, which opens and closes the channel 2. Specifically, a flange portion 8 is provided at the upper end of the valve housing 7 that projects upward from the valve box 1;
A lid 10 is attached to the lid 10 with a connecting member 9 such as a bolt or nut. A packing box 11 is attached to the lid 10 with a connecting tool 9, and the valve stem 5 is inserted vertically into the lid 10 and the packing box 11 in a skewered manner.
The handle 4 is fixed to the upper end of the seal member 12...
The valve housing 7 is sealed in a sealed manner.

Further, as shown in FIGS. 3 to 7, the valve body 3 is assembled by stacking valve half bodies 15 and 16 having hole portions 13 and 14 each having a substantially semicircular cross section, and A cylindrical hole 17 is formed therein.
Then, on the inner surface 18 of one half-valve body 15, a third
As shown in the figure, a pair of first abutting members 19, 19 are formed at a predetermined interval (i.e., with the hole 13 in between), and also on the inner surface 20 of the other half-valve body 16.
As shown in FIG. 4, a pair of second abutting members 2
1 and 21 are formed and in the overlapping state,
The respective abutting members 19 and 21 abut. Specifically, the first abutting member 19 is connected to the first abutting protrusion 22 and the first abutting member 19 .
The first abutting protrusion 22
has an inner surface 24 that is curved in an arc shape, and has an abutment surface 25 that protrudes in a slightly rounded shape as shown in FIG. That is, this contact surface 2
The radius of curvature of No. 5 is set sufficiently large. Further, the first abutting plane portion 23 is formed continuously from the inner surface 24 . Next, the second abutting member 21 includes a second abutting protrusion 26 and a second abutting flat part 27, and the second abutting protrusion 26, like the first abutting protrusion 22, It has an abutment surface 28 that protrudes in a slightly rounded shape, that is, a sufficiently large radius of curvature, and an outer surface 29 that is curved in an arc shape and fits into the inner surface 24 . Further, the second abutting plane portion 27 is formed continuously from the outer surface 29. The abutment protrusions 22 and 26 abut against the abutment plane parts 27 and 23, respectively, as shown in FIG.

The valve stem 5 has a threaded part 30 formed in most of its part except for the upper part, and is screwed into the female threaded part of a nut member 31 attached to the upper end of the valve body 3. When the threaded portion 30 rotates, the valve body 3 reciprocates up and down. That is, when the valve body 3 is moved upward, the valve stem 5 is inserted into the cylindrical hole 17 of the valve body 3, and the flow path 2 is in an open state (see FIG. 2).
Conversely, when the valve body 3 is moved downward as indicated by arrow A, the valve stem 5 is located at the upper end of the cylindrical hole 17, and the flow path 2 is closed (see FIG. 1).

Next, 32, 32 are sealing members attached along the outer periphery of each of the valve half bodies 15, 16 forming the valve body 3, and are made of, for example, fluororesin or other solvent-resistant, abrasion-resistant, etc. It is formed into a sheet ring shape using materials such as plastic and rubber that have excellent properties. 33
is a retainer ring that is fixed to the valve body 3 in a fit-in manner, and the sealing member 32 is fixed to the valve body 3 by the retainer ring 33. In addition, the sealing member 32
The tip is projected outward.

Therefore, an annular recess 3 is formed on the inner peripheral surface of the flow path 2 of the valve box 1.
4 is recessed and a pair of valve seats 35, 35 are fixed, and the valve seats 35, 35 are fixed by moving the valve body 3 forward and backward.
35 and the above-mentioned sealing member are brought into contact with each other, so that the flow path 2 can be sealed and shut off. Specifically, when the gate valve is turned from the open state shown in FIG. 2 to the closed state shown in FIG. 1 by rotating the handle 4 and moving the valve body 3 downward as shown by arrow A. The protruding tip of the sealing member 32 and the valve seat 35 contact each other to form an annular contact surface, and when viewed from the side, the valve seat 35 has a tapered shape that decreases downward as shown in FIG. becomes. At this time, even if the pair of valve seats 35, 35 are distorted relative to each other, the abutting protrusions 22, 26, as shown in FIG.
23, the valve halves 15, 16 can swing slightly corresponding to the valve seats 35, 35, and the sealing member 32 is always in pressure contact with the valve seat 35 in the closed state shown in FIG. This ensures sealing.
Furthermore, the valve half bodies 15, 16 do not shift vertically or horizontally as shown by the arrows in FIG.

Further, 36 is a stopper for suppressing the valve half bodies 15 and 16 from expanding, and is a stopper for preventing the nut member 31 from expanding.
provided at the top of the Specifically, the stopper 36
has a through hole in the center through which the valve stem 5 can move up and down, and the left and right ends in FIG. 1 are bent upward to form rising parts 37, 37. Further, a slight gap is provided between the stopper 36 and the upper end portion 38 of the valve body 3. Therefore, when opening the valve body 3 (that is, when the valve stem 5 is inserted into the hole 17)
, no force is applied to the stopper 36 , and when the valve body 3 is closed (that is, when the valve stem 5 is pulled out from the hole 17 ), the stopper 36 has no force acting on the valve stem 5 .
Since only a small force is applied, the stopper 36 is less likely to be damaged.

The present invention is not limited to the illustrated embodiment, and the design may be changed without departing from the gist of the present invention. As an alternative to the internal screw type for opening and closing the valve body 3, it is also possible to use an external screw type in which the threaded portion 30 of the valve stem 5 protrudes upward from the handle 4 and moves forward and backward.

[Effect of idea]

In the gate valve of the present invention, when the valve half bodies 15 and 16 are overlapped, the inner surface 24 of the first abutting protrusion 22 is curved in an arc shape, and the inner surface 24 of the second abutting protrusion 26 is curved in an arc shape. Since the outer surfaces 29 fit together, the valve half bodies 15 and 16 do not shift vertically and horizontally (that is, in the surface direction). Furthermore, since the plane portion and the contact surface protruding in a rounded shape are in contact with each other, the valve seats 35, 35
In response to this, the valve half bodies 15 and 16 can be slightly oscillated, and even if there are variations in the mutual angles and dimensions of the valve seats 35 and 35, the sealing member remains in the closed state of the valve body 3. 32 is always in pressure contact with the valve seats 35, 35, and the sealing performance of the valve body 3 against the valve seats 35, 35 is ensured. Further, when the threaded portion 30 of the valve stem 5 is inserted into the hole 17 of the valve body 3 to open and close the valve body 3, the respective abutting members 19, 2
1 are formed with a predetermined interval, so that the valve stem 5 is not obstructed by the abutting members 19 and 21, and the valve body 3
It can be freely inserted into the hole 17 of. Further, the valve body 3 can be used in common for the internally threaded type and the externally threaded type.

[Brief explanation of drawings]

Fig. 1 is a partially sectional side view showing an embodiment of the present invention, Fig. 2 is a partially sectional front view, Figs. 3 and 4 are rear views showing the respective valve halves, and Fig. 5. is a front view of the valve body, FIG. 6 is a sectional view taken along line X-X in FIG. 5,
FIG. 7 is a sectional view taken along the line Y--Y in FIG. 5, and FIG. 8 is an enlarged sectional view of a main part for explaining the contact state of the abutting member. 1...Valve box, 2...Flow path, 3...Valve body, 6...Axis, 1
5, 16... Valve half body, 18, 20... Inner surface, 19...
First contact member, 21...Second contact member, 22...First
Abutment protrusion, 23...first abutment plane part, 24...inner surface, 25, 28...abutment surface, 26...second abutment protrusion,
27...Second contact plane part, 29...Outer surface.

Claims (1)

[Scope of Claim for Utility Model Registration] In a gate valve equipped with a valve body 3 consisting of a pair of valve half bodies 15 and 16 that move forward and backward in a direction perpendicular to the axis 6 of the flow path 2 of the valve body 1, A first abutting protrusion 2 having a protruding abutting surface 25 and an inner surface 24 curved in an arc shape.
2 and a first abutting plane part 23 formed continuously from the inner surface 24 of the corresponding abutting protrusion 22.
are formed at predetermined intervals on the inner surface 18 of the
It has a second abutting plane part 27 that abuts the abutting surface 25 of the first abutting protrusion 22, and a slightly rounded abutting surface 28 that abuts the first abutting plane part 23. A pair of second abutting members 21, 21 each consisting of a second abutting protrusion 26 having an arcuate outer surface 29 that fits into the inner surface 24 is attached to the inner surface 20 of the other valve half body 16. A gate valve characterized by being formed with predetermined intervals.