JP3321685B2 - External threaded gate valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an externally threaded gate valve and, more particularly, to a structure of an operation part for opening and closing a valve element of the externally threaded gate valve.

[0002]

2. Description of the Prior Art As shown in FIG. 5, a conventional externally threaded gate valve comprises a valve box 2 for accommodating a valve element 1 and a lid 3 mounted on the valve box 2. A yoke 4 attached to an upper portion of the lid 3, a handle 6 provided via a sleeve 5 rotatably mounted on the top of the yoke 4, and a lower end fixed to the valve body 1. And a valve stem 7 having a male screw portion 7a which is screwed into a female screw portion formed on the inner periphery of the sleeve 5 at the upper portion. Further, a packing 8 is provided in the penetrating portion of the valve rod 7 of the lid 3, and a packing holding member 9 for holding the packing 8 is attached by an embedded bolt 10.

[0003] The conventional externally threaded gate valve having such a structure needs to use a large number of bolts and nuts for connecting the valve box 2 to the lid 3 and connecting the lid 3 to the yoke 4. It takes a lot of time and labor to disassemble and disassemble, and the flange of each connecting portion also needs a certain thickness to obtain the respective connecting strength, and each member inevitably becomes heavy.

Accordingly, an object of the present invention is to provide an externally threaded gate valve capable of reducing the number of parts, reducing the number of steps required for assembling and disassembling, and reducing the weight and size.

[0005]

In order to achieve the above object, the present invention provides a valve box containing a valve body, a lid mounted on the valve box, a yoke provided on an upper portion of the lid, A handle provided through a sleeve rotatably mounted on the upper end of the yoke, a valve stem having a male threaded portion screwed into a female threaded portion of the sleeve, and a valve stem provided in the valve stem penetration portion of the lid.
An externally threaded gate valve comprising: a packing, a packing holding member for holding the packing, and a valve rod being moved up and down through the sleeve by opening and closing the valve by rotating the handle. integrally formed with said lid and the yoke, the packing housing portion opposite sides of the connecting portion between the lid portion and the yoke portion, packings
Tomo Providing the locking portion of the bolt head down pressing member bolts
At both sides of the valve stem through hole of the packing holding member,
Fork to insert the shaft of the bolt
The locking portion has a width at which the rotation of the bolt head is locked.
A cut formed by opening around the packing storage part
A groove, and the fork portion is provided on an outer periphery of a packing holding member.
It is characterized in that it is a kerf formed to open at the end.

Further, the present invention provides that the sleeve is attached to the yoke by a C-shaped retaining ring, and that a valve seat formed in the valve box has an elliptical or elliptical shape having a flattened vertical direction. It is characterized by being formed.

[0007]

[Operation] As described above, the lid and the yoke are integrally formed, and the locking portion of the bolt for the gasket holding member is provided at the connecting portion of both, so that the number of parts can be reduced and the weight can be reduced. The number of assembly steps can be reduced. Also, the sleeve can be easily attached by attaching the sleeve with a C-type retaining ring, and furthermore, the valve seat is formed by opening and closing the valve seat by forming the valve seat into an oblong or elliptical shape having a flattened vertical direction. The valve body can be formed in a flat shape, and the moving distance from the fully closed position to the fully open position can be shortened, so that not only the valve box but also the valve stem and the yoke can be reduced in height, and the entire valve can be reduced in size and weight. .

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the embodiments shown in the drawings. FIG. 1 is a perspective view showing an embodiment of an externally threaded gate valve of the present invention, FIG. 2 is a front view thereof, and FIG.
Is a side view, and FIG. 4 is a sectional front view.

The external thread type gate valve comprises a valve box 12 having flanges 11 for connecting pipes on both sides, and an operation section 13 provided on an upper portion of the valve box 12.
Is constituted by a lid portion 14 attached to the valve box 12 and a yoke portion 15 erected on the lid portion 14.

At the center of the operating portion 13, a valve stem 17 connected to a valve body 16 is vertically movably penetrated. A male screw portion 17a formed on the upper portion of the valve stem 17 is connected to the yoke. It is screwed into a female thread portion of a sleeve 18 provided on the top of the portion 15.

The sleeve 18 is rotatably inserted into a through hole 15a formed at the top of the yoke 15, and a handle 19 is mounted on a square shaft formed at the upper part of the sleeve 18, and A C-shaped retaining ring 21 for fixing the sleeve is mounted on the upper part via a washer 20.

A ring-shaped packing 22 for sealing the valve stem 17 in a movable state is provided at a connection portion between the lid portion 14 and the yoke portion 15. The gasket 22 is housed in a gasket accommodating portion 23 provided in the valve stem penetrating portion of the lid portion 14 so as to open upward, and an upper portion thereof is pressed by a gasket pressing member 24.
The packing holding member 24 is provided with a fork portion 24b for inserting a packing holding member bolt 25 on both sides of a valve stem through hole 24a.
A locking portion 26 of a bolt head corresponding to the fork portion 24b is provided on the outer periphery of both sides of the fork portion 24b. The locking part 26
Has a width that locks the rotation of the bolt head.
Cutting grooves formed in the outer periphery of the housing portion 23,
The fork portion 24 b is provided on the outer periphery of the packing holding member 24.
This is a kerf formed to open at the bottom .

On the other hand, the valve seat 27 in the valve box 12 is formed in an oval or elliptical shape whose vertical direction is flat with respect to the true circle of the flange 11 portion. That is, the valve seat 27 is
The bottom surface is flush with the round portion of the flange 11 and the upper surface is squashed downward. Of the valve seat 27 while keeping the opening area substantially the same as the opening area of the flange 11 portion.
The height of the opening is reduced. Further, the valve element 16 is a so-called soft seal valve, which is formed by coating an elastic material 16b such as rubber around a metal core material 16a.

In the externally threaded gate valve thus configured, the lid 14 and the yoke 15 of the operation unit 13 are integrally formed, so that the number of parts of the operation unit 13 can be reduced and the weight can be reduced. The assembly of the operation unit 13 can be performed only by tightening the flange 28 at the upper part of the valve box 12 and the flange 29 at the lower part of the operation unit 13 with the bolts and nuts 30. It can be significantly reduced. Further, the sleeve 18 is attached to the C-shaped retaining ring 21.
By fixing the components, the workability can be improved and the weight of the parts can be reduced as compared with the conventional fixing using a nut member.

Further, since the locking portion 26 for locking the bolt head of the packing holding member bolt 25 is provided at the connection portion between the lid portion 14 and the yoke portion 15, the locking portion 26 connects the connection portion. Acts as a rib to reinforce and improve the strength of the operating section 13 and eliminates the need to tap the embedded bolts, reducing the number of parts and the number of steps in the packing mounting section, improving workability, etc. Can also be achieved.

In addition, as described above, since the valve seat 27 is formed in an oblong or elliptical shape whose vertical direction is flat, the amount of movement of the valve body 16 that opens and closes the valve seat 27 is reduced, and when the valve is fully opened. Since the cover 14 serving as a portion for accommodating the valve body 16 can be made smaller and the amount of movement of the valve stem 17 can be reduced, the height of the yoke 15 can be reduced. This makes it possible to further reduce the size and weight of the operation unit 13.

[0017]

The present invention can also be applied to an electric type in which a gear, a sprocket, or the like is mounted on the sleeve instead of the handle, and these are driven by a motor to open and close the valve element.

[0019]

As described above, in the externally threaded gate valve of the present invention, since the lid and the yoke mounted on the valve box are integrally formed, the operating section composed of the lid and the yoke, etc. In addition to the weight reduction, the number of parts and the labor and time required for assembling and disassembling can be greatly reduced, and the production cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of an externally threaded gate valve showing one embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a side view of the same.

FIG. 4 is a sectional front view of the same.

FIG. 5 is a half sectional view showing an example of a conventional externally threaded gate valve.
It is .

[Explanation of symbols]

12 ... valve box, 13 ... operation part, 14 ... lid part, 15 ... yoke part, 16 ... valve body, 17 ... valve stem, 18 ... sleeve, 19 ...
Handle, 21 ... C-type snap ring, 22 ... Packing, 24 ...
Packing press member, 25… Bolt for packing press member,
26: locking part, 27: valve seat

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-6-34068 (JP, A) JP-A-4-185598 (JP, A) JP-A 61-182479 (JP, U) JP-A-6-182479 146078 (JP, U) (58) Fields studied (Int. Cl. ⁷ , DB name) F16K 41/00-41/18 F16K 3/00-3/36 F16K 27/04

Claims (3)

(57) [Claims] 1. A valve box containing a valve body, a lid mounted on the valve box, a yoke provided on an upper portion of the lid, and a sleeve rotatably mounted on an upper end of the yoke. A handle, a valve stem having a male screw portion screwed into the female screw portion of the sleeve, and a valve stem provided in the valve stem penetration portion of the lid.
An externally threaded gate valve comprising a packing, a packing holding member for holding the packing, and opening and closing a valve body by moving a valve stem up and down through the sleeve by rotating the handle, wherein the lid and the yoke are provided. the integrally formed, in the packing housing portion opposite sides of the connecting portion between the lid portion and the yoke portion, the packing
In addition to providing a locking part for the bolt head of the holding member bolt
At both sides of the valve stem through hole of the packing holding member,
Fork to insert the shaft of the bolt
The locking portion has a width at which the rotation of the bolt head is locked.
A cut formed by opening around the packing storage part
A groove, and the fork portion is provided on an outer periphery of a packing holding member.
An externally threaded gate valve, characterized in that it is a kerf formed by opening the kerf . 2. The externally threaded gate valve according to claim 1, wherein the sleeve is rotatably mounted on the yoke by a C-shaped snap ring. 3. The externally threaded gate valve according to claim 1, wherein the valve seat formed in the valve box is formed in an oblong or elliptical shape having a flat upper and lower direction.