JP2575188Y2 - Valve device - 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 device, and more particularly to an angle valve for controlling the pressure of a slurry fluid at a high pressure difference.

[0002]

2. Description of the Related Art An angle valve is generally used for a pressure reduction / control line of coal slurry in a coal liquefaction plant or a pressure reduction / control line of a solid-liquid two-phase flow containing various catalysts in a chemical plant. The angle valve has an advantage that the piping system can be designed compact because the flow direction of the fluid can be bent at a right angle. However, when the angle valve is excessively depressurized on the downstream side of the valve, a large amount of gas is generated in the over-decompression part and it is easy to generate a flash fluid (gas-liquid two-phase flow). In such a case, scratching and abrasion of the trim portion are problematic.

FIG. 2 shows a conventional example of this kind of single-seat type angle valve, wherein 1 is an upstream pipe which is horizontally piped, and 2 is a pipe which is arranged substantially vertically below a downstream open end of an upstream pipe 1. Downstream pipes 3, 4 are an angle valve and a tailpiece connected between the upstream pipe 1 and the downstream pipe 2. The angle valve 3 is fitted into the fluid outlet 6 via a gasket 9 from below, with the valve body 7 having a fluid inlet 5 opening vertically and a fluid outlet 6 opening vertically downward and a fluid outlet 6 opening vertically downward. A seat ring 8, a valve shaft 12 movably inserted into the valve body 7 through a seal member 11 through a valve shaft insertion hole 10 opened on the upper surface of the valve body 7, and a valve shaft 12.
A valve plug 15 attached to the lower end of the valve shaft 12 for controlling the opening and closing of the fluid communication hole 14 of the seat ring 8, and a guide bush fitted and arranged in the valve shaft insertion hole 10 to guide and hold the valve plug 15 slidably. 16 and the valve shaft insertion hole 10
A packing follower 17 which is inserted into the upper end opening of the valve body and presses the sealing member 11;
The fluid inlet 5 is connected to the downstream opening end of the upstream pipe 1 and the fluid outlet 6
The tail piece 4 is connected via a seat ring 8. The tail piece 4 is fixed to the lower surface of the valve body 7 by a plurality of bolts 20 and cooperates with the valve body 7 to hold the seat ring 8 therebetween. The portion is connected to the lower end opening of the seat ring 8 via the orifice 22, and the lower end is connected to the upper end opening of the downstream pipe 2. For this reason, the controlled fluid 24 is decompressed in two stages in the plug portion and the orifice portion, thereby reducing the pressure reduction burden on the valve plug 15 and extending the life of the plug. That is,
On the downstream side of the valve, since the solid particles pass through the plug portion at high speed, the outer peripheral surface of the characteristic portion of the valve plug 15 and the fluid flow hole 1
The inner peripheral surface of No. 4 is scratched and worn. As a result, the valve opening is lowered to maintain the decompression performance so that the flow path becomes larger than the original design value. If the wear progresses and the valve opening also decreases, the life of the valve will be extended. Until now, a product whose life is long enough has not been developed. For this reason, the orifice 22 is incorporated to form a two-stage decompression structure to reduce the burden on the valve plug 15. As a measure against wear of the valve plug 15 itself, as shown in FIG. 3, a support member 25 made of a high-strength material such as tungsten carbide and a tip of the support member 25 made of a wear-resistant material such as sintered diamond are used. The valve plug characteristic part 26 which is silver brazed to the surface, and the holder 27 which connects the support member 25 to the inner end of the valve shaft 12
It is aimed at by configuring. Reference numeral 28 denotes a joint between the support member 25 and the valve plug characteristic portion 26, and reference numeral 29 denotes a seat portion which is seated on the seat portion 30 of the seat ring 8 when fully closed.

[0004]

In the conventional angle valve described above, at present, a valve plug whose entire size is not large enough to be made of sintered diamond is not obtained, and the valve plug is most likely to be scratched and eroded. Only the portion 26 is made of sintered diamond and is joined to the support member 25 by silver brazing. However, the joint 28 between the support member 25 and the valve plug characteristic portion 26 is liable to be eroded and removed because the fluid to be controlled is directly applied thereto, so that the life of the valve is short. There is a problem that extra work such as replacement of the characteristic unit 26 is required.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a support member and a valve plug characteristic portion which are most easily eroded and removed with a simple structure. It is an object of the present invention to provide a valve device which protects a joint portion of the valve from a controlled fluid and prolongs the life of the valve.

[0006]

According to the present invention, there is provided a valve device for controlling opening and closing of a fluid flow hole of a seat ring provided by partitioning a flow path of a valve body by a valve plug. The plug includes a cylindrical holder having a stepped small-diameter hole and a valve shaft attached to an inner end thereof, and a cylindrical column made of a high-strength material such as tungsten carbide, and fitted into the stepped small-diameter hole of the holder. A support member inserted and held, a valve plug characteristic portion made of a wear-resistant material such as sintered diamond joined to a tip surface of the support member by silver brazing, and a valve plug characteristic joined to a tip portion of the support member by silver brazing; And a collar for covering a joint between the support member and the support member.

[0007]

In the present invention, the collar covers the joint between the valve plug characteristic portion and the support member and protects it from the controlled fluid.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 is a sectional view of a main part showing an embodiment of the valve device according to the present invention. In the drawings, the same components as those of the conventional device shown in FIGS. 2 and 3 are denoted by the same reference numerals, and description thereof will be omitted. In the figure,
In this embodiment, the valve plug 15 is formed by attaching a holder 27 formed of a stainless steel or the like to a cylindrical body and screwed to an outer peripheral surface of a lower end portion of the valve shaft 12. A support member 25 to be in close contact with the support member 25;
A valve plug characteristic portion 26 made of a friction-resistant material integrally joined to a tip end surface of the member by a silver brazing;
A joining portion 28 of the supporting member 25 and the valve plug characteristic portion 26 which is also integrally joined to the tip of
2 and 3 are the same as those of the conventional angle valve shown in FIGS. 2 and 3.

The inner hole 32 of the holder 27 has a different diameter so that it is opened to the upper surface and the screw hole 32a into which the valve shaft 12 is screwed.
2b and a small-diameter hole portion 32c opened to the lower surface and having a smaller hole diameter than the straight hole 32b, and a tapered step portion 3 is provided between the straight hole 32b and the small-diameter hole portion 32c.
3 are provided. The hole diameter of the straight hole 32b is substantially equal to the root diameter of the screw hole 32a. The lower surface of the holder 27 is formed as a tapered surface.

The support member 25 is inserted from the upper end opening of the holder 27 and is pressed by the lower end surface of the valve shaft 12 so that the chamfered portion 25 a provided at the intermediate portion of the outer peripheral surface is fitted to the step portion 33 of the holder 27. It is pressed and prevented from moving in the axial direction. The lower end of the support member 25 has a small-diameter hole 32c.
And protrudes below the holder 27, the protruding end is formed in a truncated cone shape, and a fitting projection 35 is integrally provided at the center of the lower end surface.

A fitting recess 36 is formed at the center of the joining surface of the valve plug characteristic portion 35 joined to the lower surface of the supporting member 25 by silver brazing. .

The collar 31 is formed in a cylindrical shape of stainless steel or the like, and is fitted to the outer periphery of the upper end of the valve plug characteristic portion 26. The upper end opening forms a tapered hole 37, and the truncated conical portion of the support member 25. 25b and are joined by silver brazing. The upper end of the outer peripheral surface of the collar 31 is fitted into the small-diameter hole 32c of the holder 27. Therefore, the collar 31 is provided at the joint 28 between the support member 25 and the valve plug characteristic portion 26 and at the support member 25 and the collar 31.
To prevent the joints 28, 38 from being eroded and removed by the controlled fluid. Also,
Since the upper end of the collar 31 is inserted into the holder 27, the controlled fluid does not enter the holder 27.

[0013]

As described above, in the valve device according to the present invention, the collar is fitted to the joint between the support member constituting the valve plug and the valve plug characteristic portion, and this joint is polished by the fluid to be controlled. Because it was configured not to be eaten and removed,
The durability of the valve plug can be significantly improved,
The practical effect is very large, for example, there is no need to replace the valve plug characteristic part.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a valve device according to the present invention.

FIG. 2 is a sectional view of a main part showing a conventional example of a valve device.

FIG. 3 is a sectional view of a main part of the valve device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upstream piping 2 Downstream piping 3 Angle valve 4 Tail piece 5 Fluid inflow 6 Fluid outflow 7 Valve body 8 Seat ring 12 Valve shaft 14 Fluid flow hole 15 Valve plug 25 Support member 26 Valve plug characteristic part 27 Holder 28 Joining Part 31 Collar 32c Small hole 38 Joint

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tatsushi Shinogaya 29-3 Takatsudocho, Midori-ku, Chiba City, Chiba Prefecture (72) Inventor Yoshiyuki Okutsu 4-1-1 Omagari, Samukawa-cho, Koza-gun, Kanagawa Prefecture (72) Inventor Koichi Okawa 4-1-1 Omagari, Samukawa-cho, Koza-gun, Kanagawa Prefecture Inside Shonan Plant of Yamatake Honeywell Co., Ltd. (56) References JP-A-1-193469 (JP, A) JP-A Sho 63-203973 (JP, A) Japanese Utility Model Showa 60-24976 (JP, U) Japanese Utility Model Showa 62-1004073 (JP, U) Japanese Utility Model Utility Model 1-148174 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) F16K 1/00-1/54 F16K 25/04

Claims (1)

(57) [Scope of request for utility model registration] 1. A valve device for controlling the opening and closing of a fluid flow hole of a seat ring provided by partitioning a flow passage of a valve body by a valve plug, wherein the valve plug has a stepped small-diameter hole portion and a valve shaft. And a support member fitted and held in a stepped small-diameter hole portion of the holder, and a valve plug characteristic portion made of a wear-resistant material joined and fixed to a distal end surface of the support member. A collar fixedly joined to the distal end surface of the support member and covering a joint portion between the valve plug characteristic portion and the support member, and a part of an outer peripheral surface of the collar is fitted into a stepped small-diameter hole portion of the holder. A valve device, wherein at least a part of the joint between the support member and the collar is inserted into the stepped small-diameter hole.