JP2001214981A - Diaphragm valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a diaphragm valve that can permit easy and quick connection between its compressor and diaphragm and can permit reliable connection and valve seat sealing. SOLUTION: A diaphragm 22 of the diaphragm valve has a first locking metal fitting 21 comprising an embedded metal fitting 24 projected from a non-wetted surface 23 of the diaphragm 22 and a lock pin 26 set at the projecting portion of the metal fitting 24. A stem fitting recess 10 in a compressor 9 is provided with a first locking metal fitting insertion hole 14 formed by a circular hole 12 and at least one pair of diametrally extending notch grooves 13, and is mounted with a second locking metal fitting 16 having a lock pin locking hole 19 formed by a circular hole 12 and at least one pair of diametrally extending notch grooves 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm valve used for a piping line for transporting various fluids (water, pure water, corrosive chemicals, etc.), and more particularly, to easy connection between a compressor and a diaphragm. Further, the present invention relates to a diaphragm valve capable of reliably performing a connection operation and a valve seat seal.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 9 and 10, a diaphragm valve is located between an inlet flow passage 35 and an outlet flow passage 36 and between these two flow passages, and has a partition wall which curves the flow passage. 37, a bonnet 39 attached to the valve body 38, a sleeve 40 supported by a central opening of the bonnet 39, and a copper alloy stem 41 screwed to the sleeve 40. The compressor 42 is fixed to the lower portion of the stem 41, and is fixed to the compressor 42 and is sandwiched between the valve body 38 and the bonnet 39 so as to be in close contact with and separated from the upper end surface of the partition wall 37, thereby controlling the flow of fluid. This structure has a diaphragm 43 for blocking and passing the gas. In particular, the connection structure between the compressor 42 and the diaphragm 43 is configured such that the non-liquid contact surface 4 Male screw portion 47 formed on the projecting portion 46 of the embedded metal fitting 45 protrudes to the side is,
Stem fitting recess 4 located at the center of compressor 42
8 is a connection structure that is screwed to an embedded nut 50 that is non-rotatably fitted and fixed to the bottom surface 49.

[0003]

As described above, in the diaphragm valve having the above-described structure, since the diaphragm is screwed and connected to the compressor, it is difficult and time-consuming to assemble the diaphragm valve.

[0004] Further, when sealing the valve seat of the diaphragm valve, if the embedding fitting of the diaphragm is not sufficiently screwed into the embedding nut of the compressor, the diaphragm is normally pressed against the upper end surface of the partition wall. In the range of the liquid level, only the central portion, which is the portion corresponding to the flange of the embedding fitting, is pressed against the upper end surface of the partition wall, and the valve seat seal may be insufficient.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and enables the connection between the compressor and the diaphragm to be performed easily and quickly, and furthermore, the connection work and the valve seat seal are reliably performed. An object of the present invention is to provide a diaphragm valve that can be used.

[0006]

According to the present invention, there is provided an inlet channel, an outlet channel, and both of these channels.
A valve body having a partition wall for curving the flow path, a bonnet attached to the valve body, a compressor connected and fixed to a stem of a spindle supported by the bonnet, and a valve body fixed to the compressor and And a diaphragm that is interposed between the bonnet and the upper end surface of the partition wall and pressed and separated from the upper surface of the partition wall to block and pass the flow of the fluid.
The diaphragm is provided with a first locking member including an embedded metal member protruding toward the non-liquid contacting side and a locking pin provided at a protruding portion of the metal member. The fitting recess is provided with a first locking metal fitting insertion hole formed of a circular hole and at least one pair of notch grooves extending in the diameter direction thereof, and provided in the engagement hole so as to extend in the diameter direction thereof. A first feature is that a second locking fitting provided with a locking pin locking hole formed of at least one pair of cutout grooves is mounted.

[0007] A first locking fitting insertion hole provided in the stem fitting recess of the compressor has a circular hole and two pairs of notch grooves which are provided extending in the diametrical direction and are arranged substantially in a cross shape. Is a second feature.

The material of the diaphragm valve according to the present invention may be metal, porcelain, PVC, PVDF, P
Any of resin such as P may be used. In particular, a resin diaphragm valve having excellent corrosion resistance is suitably used in a piping line for a chemical solution. Also, the material of the compressor,
Although not particularly limited such as resin or metal, PVDF
Is preferred. In addition, the first latch and the second
The material of the locking metal is not particularly limited as long as it has a desired strength, but is preferably made of metal such as stainless steel.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to embodiments shown in the drawings, but it is needless to say that the present invention is not limited to the embodiments. 1 is a longitudinal sectional view showing a fully opened state of a diaphragm valve according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing a fully closed state of the diaphragm valve shown in FIG. 1, and FIG. Sectional view,
FIG. 4 is an exploded perspective view of the components of FIG. 3, FIG. 5 is a plan view of a second latch, FIG. 6 is a plan view showing an embodiment of the compressor, and FIG. 7 is a perspective view showing the back surface of the compressor. 8
Is a perspective view showing a back surface of another embodiment of the compressor, FIG. 9 is a longitudinal sectional view showing a fully opened state of a conventional diaphragm valve, and FIG. 10 is an enlarged sectional view of a main part of FIG.

[0010]

Embodiment 1 In the drawing, reference numeral 1 denotes a valve body made of PVC, in which an inlet channel 2, an outlet channel 3 and a partition wall 4 which is located between the two channels and which curves the channel are provided. Is provided. 5 is a bolt and nut (not shown) on the upper part of the valve body 1
A bonnet made of PVC is fixed at a center opening of which is supported a sleeve 6 made of a copper alloy. Reference numeral 7 denotes a copper alloy stem that is screwed with a female screw portion 8 provided inside the sleeve 6.

9 is a PVDF compressor,
A stem fitting recess 10 is provided at the center, and a bottom 11
Is provided with a circular hole 12 and a
A first lock fitting insertion hole 14 formed by a pair of notch grooves 13 is provided therethrough. The lower part of the stem 7 is fitted into the upper part of the stem fitting concave part 10, and the stainless steel pin 1 is
5 (see FIG. 7).

Reference numeral 16 denotes a second locking metal member made of stainless steel, which is substantially oval and has a circular hole 17 at the center and a pair of notch grooves 18 extending in the diameter direction thereof. A stop hole 19 is provided, and is non-rotatably fitted to the bottom surface 20 of the stem fitting concave portion 10 of the compressor 9 (FIG. 5).
reference).

Reference numeral 21 denotes a first stainless steel member provided to protrude from the center of the diaphragm 22 to the non-liquid contacting surface 23 side.
This is a locking fitting, which is formed by the embedded fitting 24 and the locking pin 26. A locking pin 26 made of stainless steel is provided on the protruding portion 25 of the embedded metal fitting 24. A substantially disk-shaped flange portion 27 is provided at a lower portion of the embedding fitting 24, and a columnar protrusion portion 25 is provided upright at a center portion thereof. The lower portions of the flange portion 27 and the columnar protrusion portion 25 It is embedded in the diaphragm 22 described later.

Reference numeral 22 denotes a diaphragm made of a rubber elastic material such as EPDM.
The outer peripheral portion is sandwiched between the valve body 1 and the bonnet 5 and comes into contact with and separates from the upper end surface of the partition wall 4 by the vertical movement of the stem 7.
Reference numeral 28 denotes a PP handle, which is fitted to the upper outer peripheral portion of the sleeve 6 and is disposed at the upper end of the hood 5.

Next, a method of connecting the compressor 9 and the diaphragm 22 according to the present invention will be described. First, the second locking fitting 16 is inserted into the bottom 11 of the stem fitting recess 10 of the compressor 9 and is fitted non-rotatably, and then the lower part of the stem 7 is inserted into the upper part of the stem fitting recess 10, Pin 15 horizontally from the top of compressor 9
To fix the compressor 9 under the stem 7. Next, from the bottom 11 of the compressor 9 to which the stem 7 is fixed, the diaphragm 22 is rotated to a position where the locking pin 26 can be inserted into the cutout groove 13, and the projection 25 of the first locking fitting 21 is moved. , A first locking metal fitting insertion hole 14 of the compressor 9 and a locking pin locking hole 19 of the second locking metal fitting 16 formed of a circular hole 17 and a pair of notch grooves 18 extending in the diameter direction thereof. After that, the locking pin 26 is hooked on the second locking bracket 16 by rotating the diaphragm 22 by 90 degrees. This is compressor 9
And the connection with the diaphragm 22 is completed.

Next, the operation of the diaphragm valve according to the present invention will be described with reference to FIGS. Inlet channel 2,
When closing the outlet flow path 3, that is, when sealing the valve seat, first, the handle 28 is rotated in the closing direction from the state of FIG. Then, the stem 7 descends in accordance with the rotation of the handle 28, and the compressor 9 descends and presses the diaphragm 22. As the handle 28 continues to be turned, the diaphragm 22 gradually curves downward, and finally comes into pressure contact with the upper end surface of the partition wall 4 of the valve body 1 to close the inlet flow path 2 and the outlet flow path 3 and close the diaphragm valve. State.

Here, the compressor 9 and the diaphragm 22 can be connected very simply and quickly only by engaging the first latch 21 and the second latch 16. In addition, since the diaphragm 22 can be reliably pressed by the entire lower portion of the compressor 9 at the time of sealing the valve seat, the shortage of the valve seat seal due to the insufficient screwing of the diaphragm mounting bracket and the compressor mounting nut as in the related art can be solved. Thus, a reliable valve seat seal can always be performed.

[0018]

Embodiment 2 FIG. 8 shows another embodiment of the compressor 9, which is intended to prevent the non-attachment of the second locking member 16 to the recess 10 for fitting the stem. 9 first fitting hole 31 of fitting recess 10
Are formed from a circular hole 29 and two pairs of notch grooves 30 extending in the diameter direction thereof and arranged in a substantially cross shape.

As a result, the second locking fitting 16 is forgotten to be fitted into the stem fitting recess 10 of the compressor 9,
Attempting to connect the compressor 9 and the diaphragm 22 by rotating the diaphragm 22 by 90 degrees, the first
The lock pin 26 of the lock fitting 21 is the first pin of the compressor 9.
Since the compressor 9 and the diaphragm 22 are disengaged from the notch groove 30 of the locking fitting insertion hole 31, the connection between the compressor 9 and the diaphragm 22 is disabled, and the non-mounting of the second locking fitting 16 can be prevented. That is, when one of the notch grooves 30 is in the first locking fitting insertion hole 31 provided in the stem fitting recess 10 of the compressor 9 and the second locking fitting 21 is not mounted, the first engagement The locking pin 26 of the metal fitting 21 functions as a locking pin releasing groove where the locking pin 26 cannot be engaged.

[0020]

As described above, the present invention has the following advantages. (1). Since the connection can be achieved simply by engaging the first locking metal and the second locking metal, the connection between the compressor and the diaphragm becomes extremely easy, and the assembling work can be performed quickly and reliably. As a result, the efficiency of maintenance work such as diaphragm replacement is improved. (2). The first locking fitting insertion hole of the stem fitting recess of the compressor is constituted by a circular hole and two pairs of cutout grooves extending in the diameter direction thereof and arranged in a substantially cross shape. When the second locking member is not attached to the hole, the locking pin of the first locking member functions as a locking pin release groove that cannot be engaged. Therefore, in assembling the diaphragm valve, the compressor is not used. And the diaphragm can be prevented from being disconnected. (3). At the time of valve seat sealing, the diaphragm can be reliably pressed by the entire lower part of the compressor, eliminating the lack of valve seat seal caused by the insufficient screwing of the diaphragm embedding metal fittings and the compressor embedding nut as in the conventional case. A valve seat seal can be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a fully opened state of a diaphragm valve showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a fully closed state of the diaphragm valve shown in FIG.

FIG. 3 is an enlarged sectional view of a main part of FIG.

FIG. 4 is an exploded perspective view of the components of FIG. 3;

FIG. 5 is a plan view of a second locking fitting.

FIG. 6 is a plan view showing one embodiment of a compressor.

FIG. 7 is a perspective view showing a back surface of the compressor.

FIG. 8 is a perspective view showing a back surface of another embodiment of the compressor.

FIG. 9 is a longitudinal sectional view showing a fully opened state of a conventional diaphragm valve.

10 is an enlarged sectional view of a main part of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Valve main body 2 ... Inlet flow path 3 ... Outlet flow path 4 ... Partition wall 5 ... Bonnet 6 ... Sleeve 7 ... Stem 8 ... Female thread part 9 ... Compressor 10 ... Stem fitting concave part 11 ... Bottom part of stem fitting concave part 12 ... Circular hole of compressor 13 ... Notch groove of compressor 14 ... Insertion hole of first locking fitting 15 ... Fixing pin of stem 16 ... Second locking fitting 17 ... Circular hole of second locking fitting 18 ... Second locking Notch groove of metal fitting 19 Locking pin locking hole 20 Bottom surface of stem fitting concave portion 21 First locking metal fitting 22 Diaphragm 23 Non-wetted surface of diaphragm 24 Embedded metal fitting 25 Projecting part of embedded metal fitting 26: locking pin of embedded metal fitting 27: flange of embedded metal fitting 28 ... handle 29: circular hole of compressor (second embodiment) 30 ... notched groove of compressor (second embodiment) 31: second Insertion holes of the locking fitting (second embodiment)

Claims (2)

[Claims] Claims: 1. A valve body having an inlet channel, an outlet channel, and a partition wall that is located between these two channels and curves the channel, a bonnet attached to the valve body, A compressor fixedly connected to the stem of the spindle supported by the bonnet, and a fluid flow by being fixed to the compressor and sandwiched between the valve body and the bonnet and pressed against and separated from the upper end surface of the partition wall. A diaphragm valve having a diaphragm for shutting off and passing therethrough, wherein the diaphragm has a first engagement member including an embedding fitting protruding toward a non-liquid contacting side and a locking pin provided at a protruding portion of the fitting. A stopper is provided, and the compressor has a stem fitting concave portion,
There is provided a first locking metal fitting insertion hole comprising a circular hole and at least one pair of notch grooves extending in the diameter direction thereof, and at least one pair provided in the circular hole and extending in the diameter direction thereof. A second locking fitting provided with a locking pin locking hole formed by a notched groove. 2. A pair of cutout grooves provided in a stem fitting recess of a compressor, the first locking fitting insertion hole being provided in a circular hole and extending in the diameter direction thereof, and being arranged in a substantially cross shape. The diaphragm valve according to claim 1, comprising: