JP3522502B2 - Valve plug - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve plug used in a valve to control opening / closing of a fluid passage.

[0002]

2. Description of the Related Art Conventionally, in a coal liquefaction plant, a petroleum refining plant containing a slurry, etc., when a fluid flow rate is controlled by a valve, even if the fluid is hard such as a slurry, the valve plug is worn to control the flow rate. To avoid problems, valve plugs made of tungsten carbide are generally used instead of metal, which is easily worn.

Further, in recent years, it has been desired to provide a valve having a longer life, and in order to realize this, the applicant of the present application has made the tip of the valve plug, which influences the life of the valve, a wear resistant material such as sintered diamond. By forming, it is intended to provide a valve plug having a longer wear life than the conventional tungsten carbide valve plug.

[0004]

Since the conventional valve plug is constructed as described above, it is necessary to use a wear resistant material such as sintered diamond which is expensive and difficult to be processed into a special shape. However, there are problems such as difficulty in providing a valve plug using such an abrasion resistant material and having a long wear life.

Further, when it is desired to manufacture a long valve plug with one wear-resistant material, it is difficult to obtain a wear-resistant material having a size corresponding to the wear-resistant material from the viewpoint of cost and the like. However, there is a problem in that it is difficult to provide a long valve plug with a simple structure.

The present invention has been made to solve the above problems, and can easily and inexpensively manufacture a wear-resistant material such as sintered diamond with a simple structure and using a minimum necessary amount. The object is to obtain a valve plug that can be used and has a longer wear life than before.

Another object of the present invention is to obtain a valve plug that can be easily and inexpensively manufactured even if it has a long size.

[0008]

According to a first aspect of the present invention, there is provided a valve plug which opens and closes a fluid passage hole of a seat ring arranged to partition a flow passage in the valve and expands in a projecting direction at a terminal end. A valve plug characteristic portion having a diameter-engaging convex portion made of a wear-resistant material, a cylindrical plug cover having a stepped small-diameter hole portion in which the valve shaft is fixed, and the valve plug characteristic portion at the tip portion. Has an engaging concave portion for sandwiching the engaging convex portion, and is divided into a plurality of portions in the axial direction, and is narrowed by the valve shaft and the stepped small diameter hole portion.
And a held characteristic portion holding member .

According to a second aspect of the present invention, there is provided a valve plug in which a fluid passage hole of a seat ring arranged to partition a flow passage in the valve is opened / closed and an engaging protrusion is provided at a terminal end of the valve plug. A valve plug characteristic portion, and a tip end portion having an engagement concave portion that engages with the engagement convex portion of the valve plug characteristic portion,
A spacer made of a wear-resistant material having an engaging protrusion at the terminal end, a cylindrical plug cover having a stepped small diameter hole in which the valve shaft is fixed, and an engaging protrusion of the spacer at the tip. And a stepped small-diameter hole portion having an engaging recessed portion for sandwiching the valve portion.
A characteristic portion holding member sandwiched between and, a pair of engaging portions of the valve plug characteristic portion and the spacer, and a connecting pin inserted into both engaging portions of the spacer and the characteristic portion holding member. It is a thing.

A valve plug according to a third aspect of the present invention is configured such that a fluid passage hole of a seat ring arranged to partition a flow passage in the valve is opened and closed, and an engaging projection portion whose end portion is expanded in a projecting direction. And a valve plug characteristic portion made of a wear-resistant material, and is formed by being divided into a plurality of parts in the axial direction, the tip end portion having an engaging concave portion for sandwiching the engaging convex portion of the valve plug characteristic portion, and a terminal end. A spacer made of a wear-resistant material having an engaging projection that is expanded in the protruding direction, a cylindrical plug cover having a stepped small diameter hole in which the valve shaft is fixed, and The spacer has an engaging concave portion that holds the engaging convex portion of the spacer, and is divided into a plurality of portions in the axial direction, and is narrowed by the valve shaft and the stepped small diameter hole portion.
And a held characteristic portion holding member .

[0011] Valve plug according to the fourth aspect of the present invention is obtained by forming a characteristic portion holding member in wear material or a material having a thermal expansion coefficient approximate to the thermal expansion coefficient of the wear material.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the theory of the embodiment of the present invention
First, in order to make this invention easier to understand, first,
A reference example is shown and explained. Reference example . FIG. 1 is a reference diagram and is a reference for understanding the present invention.
FIG. 3 is a cross-sectional view of an essential part showing an example valve plug, in which 1 is a seat ring arranged by partitioning a flow path in a valve (not shown), and 1a is a fluid flow hole through which a fluid whose flow rate is to be controlled passes. is there. A valve 2 is formed of a wear-resistant material such as sintered diamond (wear-resistant material) with a tip having a substantially conical shape for opening and closing the fluid circulation hole 1a and a cylindrical engaging protrusion 2a at the end. A connection pin insertion hole 2b for inserting the connection pin 6 is provided in the engagement convex portion 2a, which is a plug characteristic portion. This valve plug characteristic part 2
Is manufactured by forming an outer shape of sintered diamond of a predetermined size by, for example, electric discharge machining, and then performing finishing processing by ultrasonic lapping using diamond abrasive grains, and the finished dimension is, for example, 13 mm in diameter, The length is about 20 mm. Therefore, a sintered diamond of this size is easily available and easily processed.

Reference numeral 3 is a cylindrical plug cover having a stepped small diameter hole portion 3a and an insertion hole 3b through which the valve plug characteristic portion 2 is inserted, and the valve shaft 4 is screwed inside and attached.
For example, it is formed of metal such as stainless steel. The valve shaft 4 is configured to be movable up and down together with the plug cover 3 by a moving mechanism provided in a valve body (not shown), and the valve plug characteristic portion 2 integrated with the valve cover 4 allows the fluid passage hole 1a of the seat ring 1 to be connected. It is configured to open and close. 5 is formed in a stepped columnar shape so that it can be fitted and held in the plug cover 3, and has an engaging concave portion 5a that engages with the engaging convex portion 2a of the valve plug characteristic portion 2 at the tip portion thereof. A characteristic portion holding member that holds the plug characteristic portion 2.
A connecting pin insertion hole 5b for inserting the connecting pin 6 is provided in the engaging recess 5a at a position corresponding to the above-mentioned connecting pin insertion hole 2b.

[0014] The characteristic portion holding member 5 is formed of a material such as so-called super metal having a thermal expansion coefficient approximate to the thermal expansion coefficient of the wear material or the abrasion material such as sintered diamond. In addition, for example, silver wax is applied to the engagement surfaces of the engagement protrusions 2a and the engagement recesses 5a to ensure strong adhesion. As described above, the valve plug according to this reference example has the engagement protrusion 2 of the valve plug characteristic portion 2.
a and the engaging recess 5a of the characteristic portion holding member 5 are engaged with each other, and the connecting pin 6 is inserted into the connecting pin insertion holes 2b and 5b to connect and fix the valve plug characteristic portion 2 and the characteristic portion holding member 5. It was done.

[0015] Next, the operation will be described. To assemble the valve plug, first, the engaging projection 2 of the valve plug characteristic portion 2
a and the engaging recessed portion 5a of the characteristic portion holding member 5 are applied with silver solder on the engaging surfaces to engage with each other, and the connecting pin insertion holes 2b and 5b.
This can be easily performed by inserting the connecting pin 6 into the. Next, the valve plug thus assembled is fitted into the plug cover 3, and then the valve shaft 4 is screwed into the plug cover 3 to be fixed. The flow rate of the fluid is determined by moving the valve shaft 4 to the plug cover 3 by means of a moving mechanism provided in the valve body (not shown).
It is controlled by opening and closing the fluid circulation hole 1a of the seat ring 1 with the valve plug characteristic portion 2 integrated with the vertical movement. Further, since the characteristic portion holding member 5 is formed of a wear resistant material such as sintered diamond or a material such as so-called super metal having a coefficient of thermal expansion similar to that of the wear resistant material, it is compatible with a high temperature fluid. This effectively prevents damage to the engagement portion with the valve plug characteristic portion 2 due to thermal expansion due to contact.

As described above, according to this reference example , a wear-resistant material such as sintered diamond can be used in the valve plug characteristic portion 2 where wear is expected with a simple structure and a minimum required amount can be used. It can be manufactured at low cost, and has the effect of further increasing the wear life as compared with the conventional valve plug made of tungsten carbide. Further, since the characteristic portion holding member 5 is formed of a wear resistant material such as sintered diamond or a material such as so-called super metal having a coefficient of thermal expansion similar to that of the wear resistant material, it is compatible with a high temperature fluid. It is possible to effectively prevent the engagement portion with the valve plug characteristic portion 2 from being damaged by the thermal expansion due to the contact.

In the above-mentioned reference example , the valve plug characteristic portion 2 is described as being formed of sintered diamond, but the present invention is not limited to this, and artificial single crystal diamond (abrasion resistant material), ceramics (abrasion resistant material) or the like may be used. It can be formed of a wear resistant material, and the same effect can be expected.

[0018] Embodiment 1. 2 is a sectional view of a main part showing a valve plug according to Embodiment 1 of the present invention, and FIG. 3 is a plan view of FIG. In each of the following embodiments, the same or corresponding members as those already illustrated are designated by the same reference numerals, and the description thereof will be omitted or simplified. In the figure, 2c is an engaging convex portion formed at the terminal end of the valve plug characteristic portion 2, and is formed in an inverted truncated cone shape so as to expand in the protruding direction. Reference numerals 5c and 5d are holding pieces formed by dividing the characteristic portion holding member 5 into two in axial symmetry, and 5e and 5f are engagement concave portions formed so as to engage with the engaging convex portion 2c and to sandwich the engaging convex portion 2c. In addition,
Silver solder is applied to the joint surfaces of the holding pieces 5c and 5d and the engagement surfaces of the engagement protrusions 2c and the engagement recesses 5e and 5f to ensure strong adhesion. Other configurations are similar to those of the above-mentioned reference example .

[0019] Next, the operation will be described. To assemble the valve plug, first, the engaging projection 2 of the valve plug characteristic portion 2
It can be easily carried out by sandwiching c with the engaging recesses 5e and 5f of the holding pieces 5c and 5d via the silver solder. Further, since the engaging convex portion 2c is formed in an inverted truncated cone shape, after the engaging convex portion 2c is engaged and sandwiched by the engaging concave portions 5e and 5f,
It is possible to easily prevent the valve plug characteristic portion 2 and the characteristic portion holding member 5 from being separated from each other in the axial direction. Next, the valve plug thus assembled is fitted into the plug cover 3 (not shown), and the valve shaft 4 is screwed into the plug cover 3 to be fixed. The control of the flow rate of the fluid is the same as in the case of the above-mentioned reference example , and therefore its explanation is omitted.

As described above, according to the first embodiment, since the connecting pin 6 and the connecting pin insertion holes 2b and 5b used in the above-mentioned reference example can be omitted and the structure can be simplified, the assembling can be further facilitated. The effect is obtained.

In the first embodiment described above, the characteristic portion holding member 5 is axially symmetrically divided into two and formed by the holding pieces 5c and 5d. However, the present invention is not limited to this.
For example, as shown in FIG. 4, the holding piece 5 is axially symmetrically divided into three parts.
g, 5h, 5i, or, as shown in FIG. 5, the holding pieces 5j, 5k, 5m, 5n which are axially symmetrically divided into four parts can be formed, and the same effect can be expected. Here, FIG. 4 is a plan view showing the characteristic part holding member divided into three parts, and FIG. 5 is a plan view showing the characteristic part holding member divided into four parts. Further, by providing a connection pin insertion hole or a connection pin inserted into this at the engagement portion between the valve plug characteristic portion 2 and the characteristic portion holding member 5, it is possible to realize even stronger fixation.

[0022] Embodiment 2. The second embodiment is configured by interposing a spacer between the valve plug characteristic portion 2 and the characteristic portion holding member 5 in the above reference example . FIG. 6 shows a second embodiment of the present invention.
FIG. 4 is a cross-sectional view of a main part showing a valve plug according to FIG. 1, in which 7 is formed in a substantially cylindrical shape, and has an engaging concave portion 7 a that engages with the engaging convex portion 2 a of the valve plug characteristic portion 2, The spacer is made of a wear-resistant material such as sintered diamond and has an engaging projection 7b that engages with the engaging recess 5a of the characteristic portion holding member 5 at the terminal end. The engaging recess 7a is provided with a connecting pin insertion hole 7c through which the connecting pin 8 is inserted, at a position corresponding to the above-mentioned connecting pin insertion hole 2b. Further, the engaging projection 7b is provided with a connecting pin insertion hole 7d through which the connecting pin 9 is inserted at a position corresponding to the above-described connecting pin insertion hole 5b. Other configurations are similar to those of the above-mentioned reference example .

It should be noted that, for example, silver solder is applied to the engaging surface between the engaging convex portion 2a and the engaging concave portion 7a and the engaging surface between the engaging convex portion 7b and the engaging concave portion 5a for strong adhesion. I have collateral. As described above, the valve plug according to the second embodiment includes the connecting pin insertion holes 2b and 7c in both engaging portions of the valve plug characteristic portion 2 and the spacer 7, and both the spacer 7 and the characteristic portion holding member 2. The valve pin characteristic portion 2 and the characteristic portion holding member 5 are connected and fixed by inserting the connecting pins 8 and 9 into the connecting pin insertion holes 5b and 7d in the engaging portion, respectively.

[0024] Next, the operation will be described. In assembling the valve plug, first, silver brazing is applied to the engaging surfaces of the valve plug characteristic portion 2 and the characteristic portion holding member 5 and the spacer 7 to engage them, and the connecting pin insertion holes 2b and 7c and the connecting pin insertion holes are formed. This can be easily performed by inserting the connecting pins 8 and 9 into 5b and 7d, respectively. Therefore, by interposing the spacer 7 between the valve plug characteristic portion 2 and the characteristic portion holding member 5, a long-sized valve plug can be easily and inexpensively manufactured. Next, the valve plug thus assembled is fitted into the plug cover 3 (not shown), and the valve shaft 4 is screwed into the plug cover 3 to be fixed. The control of the flow rate of the fluid is the same as in the case of the above-mentioned reference example , and therefore its explanation is omitted.

As described above, according to the second embodiment, by interposing the spacer 7 between the valve plug characteristic portion 2 and the characteristic portion holding member 5, it is difficult to obtain a wear resistant material of a large size. Therefore, it is not necessary to form the valve plug characteristic portion 2, and the effect that a long-sized valve plug can be easily and inexpensively manufactured is obtained.

In the second embodiment described above, one spacer 7 is interposed between the valve plug characteristic portion 2 and the characteristic portion holding member 5, but the present invention is not limited to this, and a desired valve plug may be used. Spacer 7 according to the length of
Two or more may be interposed. Further, although the spacer 7 is described as being formed of a wear resistant material such as sintered diamond, it is not limited to this, and it may be formed of a wear resistant material such as artificial single crystal diamond or ceramics, or stainless steel or other metal such as titanium. Can also be coated to improve wear resistance.

[0027] Embodiment 3. The third embodiment is constructed by interposing a spacer between the valve plug characteristic portion 2 and the characteristic portion holding member 5 in the first embodiment. FIG. 7 is a sectional view of an essential part showing a valve plug according to Embodiment 3 of the present invention. In the figure, 10 is a wear-resistant material such as sintered diamond formed into a substantially cylindrical shape, which is axially symmetrically divided into two parts. The spacer includes the spacer pieces 10a and 10b formed as described above. The spacer pieces 10a and 10b have engagement recesses 10 for engaging and sandwiching the engagement projections 2c of the valve plug characteristic portion 2.
c and 10d are provided at the front end portion, and the engagement convex portion 1 is engaged and sandwiched at the end portion by the engagement concave portions 5e and 5f of the characteristic portion holding member 5.
It has 0e and 10f. The engaging protrusions 10e, 10
f is formed so as to have an inverted truncated cone shape when assembled. Other configurations are the same as those in the first embodiment. It should be noted that the joining surfaces of the holding pieces 5c and 5d, the engaging surfaces of the engaging convex portions 2c and the engaging concave portions 10c and 10d, and the engaging surfaces of the engaging convex portions 10e and 10f and the engaging concave portions 5e and 5f are used. For example, silver brazing is applied to ensure strong adhesion.

[0028] Next, the operation will be described. To assemble the valve plug, first, the valve plug characteristic part 2 and the spacer 1
Apply silver wax to each engagement surface with
The engagement protrusions 2c of the valve plug characteristic portion 2 are engaged and sandwiched by the engagement recesses 10c and 10d of a and 10b. And
The engaging projections 10e and 10f of the spacer 10 integrated with the valve plug characteristic portion 2 are replaced with the engaging recesses 5 of the holding pieces 5c and 5d.
Engage and pinch via the silver solder by e and 5f. At this time, since the engagement protrusion 2c and the engagement protrusions 10e and 10f are formed in the shape of an inverted truncated cone, the valve plug characteristic portion 2 and the characteristic portion holding member 5 are axially engaged with each other after they are clamped. It can be easily prevented from separating in the direction. Therefore, by interposing the spacer 10 between the valve plug characteristic portion 2 and the characteristic portion holding member 5, it is possible to easily and inexpensively manufacture a valve plug having a long dimension.

Next, the valve plug thus assembled is fitted into the plug cover 3 (not shown ), and then the valve shaft 4 is inserted.
Is fixed to the plug cover 3 by screwing. The control of the flow rate of the fluid is the same as in the case of the above-mentioned reference example , and therefore its explanation is omitted.

As described above, according to the third embodiment, the same effect as that of the first embodiment can be obtained, and the spacer 10 is provided between the valve plug characteristic portion 2 and the characteristic portion holding member 5. With the interposition of the connecting pins 8 and 9 and the connecting pin insertion hole 2 used in the second embodiment.
Since b, 7c, 5b and 7d can be omitted and the configuration can be simplified, the effect of further facilitating the assembly can be obtained.

In the third embodiment described above, one spacer 10 is interposed between the valve plug characteristic portion 2 and the characteristic portion holding member 5, but the present invention is not limited to this, and a desired valve plug may be used. Two or more spacers 10 may be interposed depending on the length. In addition, the spacer 10
Was described as being formed from a wear resistant material such as sintered diamond, but not limited to this, it may be formed from a wear resistant material such as artificial single crystal diamond or ceramics, or a coating such as titanium may be applied to stainless steel or another metal. It is also possible to improve wear resistance.

The characteristic portion holding member 5 shown in the above-mentioned reference examples, Embodiments 1 and 2 is not provided, and the shape of the tip end portion of the valve shaft 4 is changed to the characteristic portion holding member 5. The connecting pin 6 is formed in the same shape as the vicinity of the recess 5a.
It is also possible to directly connect and fix the valve plug characteristic portion 2 to the valve shaft 4 by means of 9 using silver solder.

[0033]

As is evident from the foregoing description, according to the first aspect of the invention, a valve plug characteristic portion consisting of wear material has an engaging convex portion which is enlarged in the projecting direction, of the valve plug characteristic portion The valve plug characteristic portion and the characteristic portion holding member are connected to each other, because the characteristic portion holding member has an engaging concave portion that holds the engaging convex portion and is formed by being divided into a plurality of portions in the axial direction. There is an effect that the connecting pin for fixing and the connecting pin insertion hole for inserting the connecting pin can be omitted and the structure can be simplified, and the assembling can be further facilitated.

According to the second aspect of the invention, a valve plug characteristic portion consisting of wear material having a engaging projection, and a spacer made of a wear material has an engaging recess and the engaging projection, A characteristic portion holding member having an engaging concave portion, both engaging portions of the valve plug characteristic portion and the spacer, and connecting pins respectively inserted in both engaging portions of the spacer and the characteristic portion holding member. Since it is configured, it is not necessary to form the valve plug characteristic portion with a large-sized wear-resistant material that is difficult to obtain, and there is an effect that a long-sized valve plug can be easily and inexpensively manufactured.

[0035] According to the third aspect of the present invention, a valve plug characteristic portion consisting of wear material has an engaging convex portion which is enlarged in the projecting direction, are formed in a plurality in the axial direction, the engagement A spacer made of a wear-resistant material having a concave portion and an engaging convex portion having a diameter enlarged in the protruding direction, and a characteristic portion holding member having an engaging concave portion and formed by being divided into a plurality of parts in the axial direction are configured. Therefore, it is not necessary to form a valve plug characteristic part with a large size of abrasion resistant material that is difficult to obtain, and a long size valve plug can be easily and inexpensively manufactured, and a connecting pin for connecting and fixing a spacer and a corresponding connection. There is an effect that the connecting pin insertion hole for inserting the pin can be omitted and the structure can be simplified and the assembly can be further facilitated.

According to the fourth aspect of the invention, since it is configured to form a characteristic portion holding member in wear material or a material having a thermal expansion coefficient approximate to the thermal expansion coefficient of the wear-resistant material, the hot fluid This has the effect of effectively preventing damage to the engagement portion with the valve plug characteristic portion due to thermal expansion due to contact.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a valve plug as a reference example for understanding the present invention.

FIG. 2 is a cross-sectional view of essential parts showing a valve plug according to Embodiment 1 of the present invention.

FIG. 3 is a plan view of FIG.

FIG. 4 is a plan view showing a characteristic portion holding member divided into three parts.

FIG. 5 is a plan view showing a characteristic portion holding member divided into four parts.

FIG. 6 is a sectional view of a key portion showing a valve plug according to a second embodiment of the present invention.

FIG. 7 is a sectional view of a key portion showing a valve plug according to a third embodiment of the present invention.

[Explanation of symbols]

1 seat ring 1a Fluid circulation hole 2 Valve plug characteristic section 2a, 2c, 7b, 10e, 10f Engagement protrusion 3 plug cover 3a Stepped small diameter hole 4 valve shaft 5 Characteristic part holding member 5a, 5e, 5f, 7a, 10c, 10d Engagement recess 6,8,9 connecting pin 7, 10 Spacer

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F16K 1/00-1/54

Claims (4)

(57) [Claims] 1. A valve plug made of a wear-resistant material, having a seat ring arranged to partition a flow path in the valve, opening and closing a fluid passage hole, and having an engaging projection that is enlarged in a projecting direction at a terminal end. A characteristic portion, a cylindrical plug cover in which the valve shaft is fixed and has a stepped small diameter hole portion, and an engaging concave portion for sandwiching the engaging convex portion of the valve plug characteristic portion in the tip end portion in the axial direction. Is divided into a plurality of parts and is sandwiched between the valve shaft and the stepped small diameter hole.
Valve plug having a characteristic holding member . 2. A valve plug characteristic portion made of a wear-resistant material having an engaging convex portion at a terminal end and opening and closing a fluid circulation hole of a seat ring arranged to partition a flow passage in the valve, and a tip end portion thereof. Has an engaging concave portion that engages with the engaging convex portion of the valve plug characteristic portion, and a spacer made of a wear-resistant material having an engaging convex portion at the terminal end, and a valve shaft fixed inside the stepped portion. A cylindrical plug cover having a small-diameter hole portion, and an engagement concave portion for holding the engagement convex portion of the spacer at the tip end portion, and the valve shaft and the step
The characteristic portion holding member sandwiched by the attached small diameter hole portion, the engaging portions of the valve plug characteristic portion and the spacer, and the engaging portions of the spacer and the characteristic portion holding member are respectively inserted. Valve plug with connecting pin. 3. A valve plug made of a wear-resistant material, having a seat ring arranged to partition a flow passage in the valve, opening and closing a fluid passage hole, and having an engaging projection having a diameter enlarged in a projecting direction at a terminal end thereof. A characteristic portion and a plurality of portions formed in the axial direction in a divided manner, and an engaging concave portion for sandwiching the engaging convex portion of the valve plug characteristic portion is formed at a front end portion thereof, and an end portion having a diameter enlarged in a protruding direction. A spacer having a fitting convex portion and made of a wear resistant material, a cylindrical plug cover having a stepped small diameter hole portion in which the valve shaft is fixed, and a member for holding the engaging convex portion of the spacer at the tip portion. The valve shaft and the stepped small-diameter hole have a fitting recess and are divided into a plurality of parts in the axial direction.
A valve plug having a characteristic part holding member sandwiched between the part and the part . 4. The characteristic holding member is formed of a wear resistant material or a material having a coefficient of thermal expansion similar to that of the wear resistant material. The valve plug according to item 1.