JPH0212375Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Field of industrial application] The present invention is applicable to fluids with large temperature differences with the atmosphere, such as low-temperature fluids such as liquefied methane (LNG) and various gaseous high-temperature fluids. This invention relates to improvements in valves used as control valves.

[Conventional technology]

A conventional control valve device of this type has a configuration as schematically shown in FIG. To explain this simply, reference numeral 1 in the figure is a valve main body having a flow rate control section using a plug 3 as a valve body provided at the inner end of a valve shaft 2, and 4 is an inlet side passage 1a within this valve main body 1. A valve seat is provided facing the plug 3 at the opening of a partition wall 1c that partitions between the valve shaft 2 and the outlet passage 1b, and the valve shaft 2 penetrates the valve body 1 at a position facing the valve seat 4. The actuator is provided so as to extend upward for a predetermined length, and an operating means such as a diaphragm type actuator (not shown) is provided at the upper end thereof.

Reference numeral 5 denotes an upper lid member called an extension bonnet, which has a substantially elongated cylindrical shape and is attached and fixed to the opening for taking out the valve shaft 2 of the valve body 1 via bolts. A lower cylindrical body 5A having a guide bush 6 as a guide means for slidably holding the plug 3 at the inner end of the valve shaft 2, and a relay pipe 5 connected to the upper end thereof by being fixed by welding or the like.
B, and an upper cylindrical body 5C, which has a shaft seal packing 7 which is connected to the upper end of the valve shaft 2 by being similarly fixed by welding or the like and which slidably supports the upper end of the valve shaft 2 while maintaining a sealed state. ing. Note that the valve stem 2
is loosely inserted into the above-mentioned upper cover member 5 while being supported by a guide bush 6 and a shaft seal packing 7, and 8 in the figure is an upper cylindrical body 5C of the upper cover member 5. It is a packing holder that is fixed with a bolt to the upper end. Further, the fluid control operation of the control valve device having such a configuration is well known, and its explanation will be omitted.

By the way, in the control valve device having the above-described configuration, if the length of the upper lid member 5 is insufficient even though the fluid used is a low-temperature or high-temperature fluid with a temperature difference from the atmosphere, this upper lid member This may lead to problems such as deterioration of liquid sealing performance due to the influence of fluid, such as freezing or boiling of the shaft sealing packing 7 of the valve shaft 2 provided at 5. In order to avoid this, the height h necessary for sufficient heat exchange to the extent that the temperature transmitted to the hanging portion on the upper end side of the upper cover member 5 is within the specification range of the packing material is provided. be. In this case, if necessary, the fluid to be controlled (used) may be controlled by a method such as housing the valve body 1 together with the lower part of the upper lid member 5 in the inner container 9 and filling the gap with a pad or the like. Measures to keep things cold or warm may also be taken.

[Problem that the invention attempts to solve]

However, in the conventional configuration as described above,
In addition to the long rising height of the upper cover member 5 that stands above the valve body 1, the entire valve is likely to lose its balance due to vibrations, shocks, etc. caused by the flow of fluid at the piping site. If this was severe, there was a risk of problems such as collapse. Furthermore, due to the characteristics of low-temperature and high-temperature fluids, stagnation and adhesion within the flow path are likely to occur.
In addition, maintenance inside the valve body must be carried out frequently and carefully.Especially when cold or warm insulation measures have been taken, just dismantling the container 9 is troublesome, and measures that may lead to a complicated valve structure and difficulty in disassembly. He had a handicap that made it difficult to train him.

[Means for solving problems]

In order to meet such demands, the valve according to the present invention has a long cylindrical portion fixedly or integrally provided on the valve body side so as to surround the periphery of the valve shaft extending upward from within the valve body. to form the valve body into a longitudinal shape,
By inserting the inner intubation tube through the upper end opening and fitting the insertion end into the fitting hole formed near the base of the cylindrical part, a double tube configuration is achieved, and the upper end of the inner intubation tube It is formed into a flange shape and is integrally bolted to the upper end opening of the main body together with the upper cover.

[Effect]

According to the present invention, the inner tube is simply inserted into the valve body to facilitate maintenance, but since its downwardly extending end is tightly fitted into the valve body, the valve top The strength of the elongated cylindrical portion on the valve body side can compensate for the lateral shaking of the valve body, thereby increasing the support strength of the upper cover.

〔Example〕

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

FIG. 1 shows an embodiment of the valve according to the present invention, and in this figure, the same or corresponding parts as in FIG.

Now, according to the present invention, the valve shaft 2 extends upwardly from the valve body 1, which has a fluid control section that controls opening and closing of the internal flow path by the plug 3 provided at the inner end of the valve shaft 2. A long cylindrical part 10,1 integrally provided on the valve body 1 side so as to surround the periphery of the valve body 1.
1, 12, 13, and the extended end of this cylindrical portion 10 (the flange 11 formed at the upper end of the upper cylindrical body 11).
an upper lid 14 which is removably attached to and fixed to a) and has a shaft sealing packing 7 for supporting the valve shaft 2;
This upper cover 14 allows the extension end 1 of the cylindrical portion 10 to
An inner tube 16 is provided with a flange portion 15a which is clamped and fixed at a portion 1a, and is inserted into the valve body 1 and into which the valve shaft 2 is loosely inserted. The main body 1 is fitted into a fitting hole 17 formed near the base of the cylindrical portion 10 to be fixed therein, and a guide member (guide bush 6) for the plug 3 is provided on the inner periphery thereof. have.

Here, the elongated cylindrical portion 10 is connected to the upper cylindrical body 11 having the mounting flange 11a to which the upper lid 14 is fixed with bolts or the like, and is fixed by welding or the like to the lower end of the upper cylindrical body 11, as described above. relay pipe 12,
The lower cylindrical body 13 is formed by standing upright from the valve body 1 side, the lower end of which is fixed by welding or the like, and the valve body 1 is made to have a required rising height. It is formed in a series. Also,
The inner tube 16 is connected to a tube main body 18 having a diameter smaller than that of the cylindrical portion 10 and larger than the valve shaft 2, and fixed to the upper end thereof by welding or the like. The upper end member 15 having the flange portion 15a and the lower end member 19 connected to the lower end of the tubular body 18 by being similarly fixed by welding or the like.
and are inserted into the cylindrical portion 10. The upper end member 15 is
The lower end member 19 is tightly fitted and held in the inner hole of the upper cylinder body 11 of the cylindrical part 10, while the lower end member 19 is
The valve body 1 is fitted into a fitting hole 17 formed in the bottom of the lower cylindrical body 13 facing the valve seat 4, and is tightly fitted and fixed therein.

Of course, these cylindrical portion 10 and internal tube 16 are
The valve body 1 is formed to have a long length with a required rise height depending on the temperature of the fluid flowing inside the valve body 1, etc. Further, in the figure, 15b and 19a are gaskets and O-rings for sealing, and 20 is for sealing between the upper end (upper end member 15) of the inner tube 16 held at the upper end of the cylindrical portion 10 and the upper lid 14. It's a gasket.

Note that the present invention is not limited to the structure of the embodiment described above, and the shape, structure, etc. of each part may be modified and changed as appropriate. For example, in the above embodiment, the present invention is applied to a single-seat valve, but the present invention is not limited to this, and the valve type may be a double-seat valve, a cage valve, or a rotating shaft valve. It can be applied to various valve devices including butterfly valves, rotary valves, etc., and the structure of each part can be changed accordingly.

[Effect of idea]

As explained above, according to the valve according to the present invention, the upper cover, which is removably attached to the extension end extending upward along the valve shaft, is supported by the double pipe structure of the relay pipe and the inner tube. This makes it possible to increase the support strength compared to conventional methods, and even if the liquid used has a considerable temperature difference from the atmosphere, the required rising height can be stably maintained. It is possible. Furthermore, according to the present invention, the above-mentioned internal tube can be easily pulled out and removed when disassembled as necessary for maintenance and inspection of the plug, valve seat, etc., or for cleaning the inside of the valve body. This is advantageous in terms of workability, etc. Furthermore, even if the valve body is housed in a cold or warm container as necessary, the upper part of the neck of the body can be exposed to the outside, so it is difficult to disassemble the valve. There is no need to destroy the container etc. In this case, the conventional drawback of not being aware of leakage of fluid within the container can also be solved. Further, accidents caused by changes in tightening force due to expansion and contraction of bolts for fixing the top cover due to temperature effects can be reduced, and further tightening can be performed freely.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing a schematic configuration of a control valve device to which a valve according to the present invention is applied, and FIG. 2 is a schematic sectional view showing a conventional example. 1...Valve body, 2...Valve stem, 3...Plug (valve body), 4...Valve seat, 6...Guide bush (guide member), 7...Shaft seal packing, 10...Long cylinder shaped part, 11... upper cylinder body, 11a... flange, 12... relay pipe, 13... lower cylinder body, 14...
...Top lid, 15, 19...Top, lower end member, 1
6... Internal intubation tube, 17... Fitting hole, 18... Tubular body.

Claims (1)

[Scope of utility model registration request] A valve body having a fluid control section that controls opening and closing of an internal flow path by a valve body provided at one end of the valve shaft, and a valve shaft whose other end extends upward from the valve body. an upper lid having a long cylindrical part integrally provided on the valve body side so as to be attached to the valve body; and a shaft sealing packing detachably fixed to the extended end of the cylindrical part and movably supporting the valve shaft; , an inner tube having a flange portion clamped and fixed at an extended end of the cylindrical portion by the upper cover, and having a valve shaft inserted loosely into the valve body;
The valve is characterized in that the lower end of the inner tube is fitted into a fitting hole formed near the base of the cylindrical portion.