JPH039552Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an analysis valve suitable for use in analyzing gas filled in a container.

[Conventional technology]

Generally, when analyzing the composition or impurities contained in a gas filled in a container, the gas in the gas container to be analyzed is introduced into the gas analyzer via an analysis valve and a conduit. Since atmospheric air enters the analysis valve and conduit when connected to a gas analyzer, it is necessary to purge the atmospheric air before performing gas analysis. In such a case, using an analysis gas as the purge gas is effective because it allows reliable purging, but an expensive analysis gas is not economical, and when the gas is toxic, post-treatment is a problem.

Therefore, in general, it does not affect the gas analysis value,
In addition, it is common to purge with an inexpensive gas such as nitrogen gas.

However, when purging with a gas other than the gas to be analyzed, the connecting portion between the container valve of the gas to be analyzed container and the analysis valve cannot be sufficiently purged, resulting in a problem of measurement errors.

In order to solve this problem, a valve device as illustrated in FIG. 2 has been proposed. This valve device includes a valve box 5, a gas introduction pipe 1 having a cap nut 2 at its end for connection with a container valve (not shown) of a gas container to be analyzed, and a gas analyzer at its end. Gas outlet pipe 3 having a connection part 4 with a conduit (not shown)
The two pipes 1 and 3 are connected through a valve chamber in the valve body 5, and the valve body 7 formed at the end of the valve stem 6 is seated on the valve seat formed in the valve chamber. 1,3
The valve box 5 of the analysis valve constitutes an analysis valve that shuts off the
A purge valve 10 having a purge gas inlet 8 and a purge gas outlet 9 is provided, and an open end 11 of the purge gas outlet 9 penetrates into the gas inlet pipe 1 and extends to the cap nut 2.

This valve device connects the cap nut 2 to the container valve of the gas container to be analyzed and the connecting portion 4 of the gas outlet pipe 3 to the conduit communicating with the analyzer, and then opens the valve body 7 to connect the gas inlet pipe 1. The flow path of the gas analyzer is switched to the atmosphere discharge side, and in this state, the purge valve 10 is opened to allow the purge gas to flow.

After sufficient purging, close the purge valve 10, then close the valve body 7, open the container valve, switch the flow path of the gas analyzer to the measurement side, gradually open the valve body 7, and open the gas container to be analyzed. The gas to be analyzed inside the chamber is flowed through a gas analyzer while adjusting the flow rate, and analysis is performed.

According to this valve device, the purge gas flowing out from the open end 11 of the purge gas outlet 9 of the purge valve 10 flows to the container valve side and then flows through the gas introduction pipe 1 to the gas outlet pipe 3. bag nut 2
This prevents purge gas from accumulating at the joint between the two, allowing reliable purging.

[The problem that the idea aims to solve]

However, since this valve device has a structure in which the purge valve is attached to the valve box of the analysis valve, it is necessary to open and close both valves, which has the disadvantage of making the operation complicated and making the structure complicated.

In view of the above-mentioned disadvantages, the present invention aims to provide an analysis valve that can perform reliable purging and supply of gas to be analyzed with a single valve operation without requiring a separate purge valve. It is said that

[Means to solve the problem]

The feature is that a gas inlet that communicates with the valve chamber is bored at one end of the valve box, a valve seat is formed around the valve chamber opening of the gas inlet, and a valve seat is formed from the gas inlet to the valve box. A gas outlet pipe and a purge gas inlet pipe are provided in order toward the other end to penetrate the valve body body and communicate with the valve chamber, and a valve body that seats on the valve seat and closes the gas inlet port is provided at the tip. The valve stem is airtightly moved forward and backward by a gland member provided at the other end of the valve body, and an elongated protrusion that is loosely inserted into the gas inlet is provided at the tip of the valve body. A purge gas flow path having an outlet at the tip is formed in the valve stem and the elongated protrusion, and seal rings are provided around the valve stem to be movable together with the valve stem, respectively, on the gland member side and the valve body side across the inlet of the purge gas flow path. The space formed by the valve stem circumferential surface and the inner surface of the valve chamber is airtightly partitioned to define a compartment, and when the valve body moves toward the gland member side, The seal ring is located closer to the gland member than the purge gas introduction pipe, and the seal ring on the valve body side is located closer to the valve seat than the purge gas introduction pipe, and when the valve body moves toward the valve seat, the gland member Both seal rings are arranged so that the side seal ring is located closer to the valve seat than the purge gas introduction pipe.

[Effect]

Therefore, when the valve body is moved toward the gland member, the seal ring on the gland member side is closer to the gland member than the purge gas introduction pipe, and the seal ring on the valve body side is closer to the valve seat than the purge gas introduction pipe. The purge gas inlet pipe and the purge gas passage communicate with each other via the compartment, and the purge gas enters the valve chamber from the outlet of the purge gas passage through between the gas inlet and the elongated protrusion; Flows into the gas outlet pipe and performs purging.

When the valve body is moved to the valve seat side, the seal ring on the gland member side, which is located closer to the valve seat than the purge gas introduction pipe, shuts off the purge gas introduction pipe and the purge gas flow path, and the gas to be analyzed is The gas enters the valve chamber through the gap between the mouth and the elongated protrusion, flows into the gas outlet pipe, and is analyzed by an analyzer.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a central vertical sectional view of the analysis valve according to the present invention, illustrating the fully open state.

In the figure, 20 is a valve box, and one end of the valve box 20 is provided with a gas inlet 22 that communicates with the valve chamber 21, and a valve seat is provided around the opening of the valve chamber 21 of the gas inlet 22. 23 is formed. In the body of the valve box 20 above the gas inlet 22, there is a gas outlet pipe 24 that passes through the body and communicates with the valve chamber 21.
and a purge gas introduction pipe 25 are provided in this order toward the other end of the valve box 20. A cap nut 26 for connection with a container valve (not shown) of a gas container to be analyzed is rotatably engaged with a flange portion 20a formed at one end of the valve box 20.

The valve chamber 21 is equipped with a valve stem 27 that can move forward and backward in an airtight manner.

The valve stem 27 has a threaded portion 28 on the circumferential surface near the tip.
Each valve body 29 has an inverted conical shape at its tip, and an elongated protrusion 30 extending through the gas introduction port 22 is loosely inserted into the center of the valve body 29 . In addition, an inlet 31b is provided in the valve stem 27 and the elongated protrusion 30 on the circumferential surface of the valve stem 27, and an inlet 31b is provided in the valve stem 27 and the elongated protrusion 30.
A purge gas flow path 31 having an outlet 31a at its tip is formed.

This valve stem 27 connects the elongated protrusion 30 to the gas inlet 2
A threaded part 32 that is loosely inserted into the inside of the valve chamber 21 and has a threaded part 28 formed on the circumferential surface of the valve stem 27 and formed on the inner surface of the valve chamber 21.
At the same time, the other end of the valve stem 27 is screwed into the valve body 2.
The gland member consisting of a gland packing 36, a packing holding member 37 and a gland nut 38 provided at the other end of 0 is fitted into the ground member to protrude, and the gland packing 36 is tightened with the gland nut 38 via the packing holding member 37 to make it airtight. The valve stem 27 is held and rotated by a handle 39 provided at the outer end of the valve stem 27, causing the valve stem 27 to spirally move back.

Further, a purge gas flow path 31 is provided on the circumferential surface of the valve stem 27.
Two seal rings 33 and 34, such as O-rings, are mounted movably together with the valve stem 27 on the gland nut 38 side and the valve body 29 side across the inlet 31b,
A space formed by the circumferential surface of the valve stem 27 and the inner surface of the valve chamber 21 is airtightly partitioned to define a compartment 35.

These seal rings 33, 34 are closed when the valve body 29 moves toward the gland nut 38, that is, when the first
In the state shown in the figure, the seal ring 33 on the gland nut 38 side is closer to the gland nut 38 than the purge gas introduction pipe 25, and the seal ring 33 on the valve body 29 side
are located closer to the valve seat 23 than the purge gas introduction pipe 25, and when the valve body 29 moves toward the valve seat 23, the seal ring 33 on the gland nut 38 side
is located closer to the valve seat 23 than the purge gas introduction pipe 25.

Therefore, when the valve body 29 moves toward the gland nut 38, the purge gas introduction pipe 25 and the purge gas passage 31 communicate with each other via the compartment 35.
When the valve body 29 moves toward the valve seat 23, the purge gas introduction pipe 25 and the purge gas passage 31 are cut off.

Note that 40 is a gasket for sealing with a container valve provided at one end of the valve box 20, and 41 is an annular passage formed between the gas inlet 22 and the elongated projection 30.

The use of the analysis valve constructed as described above will now be described.

First, with the container valve (not shown) of the gas container to be analyzed closed and the flow path of the gas analyzer set to the atmosphere release side, the cap nut 26 is attached to the sealing gasket 40.
are connected to the vessel valve via the gas outlet tube 24 and to a conduit (not shown) communicating the gas outlet tube 24 to a gas analyzer.

Further, by turning the handle 39, the valve stem 27 is moved back to the state shown in FIG. 1, and the valve body 29 is opened to communicate the gas inlet 22 and the valve chamber 23.
The purge gas introduction pipe 25 and the purge gas flow path 3 are communicated via the partition chamber 35.

Then, when a purge gas such as nitrogen is introduced from the purge gas introduction pipe 25, the purge gas becomes
The purge gas passes through the purge gas flow path 31 from the compartment chamber 35, flows out from the outlet 31a at the tip of the elongated protrusion 30, enters the cap nut 26, passes through the annular passage 41 and the valve chamber 21, and is led out from the gas outlet pipe 24 to the gas analyzer. The gas enters a conduit that communicates with the gas analyzer, and is discharged to the atmosphere through the atmosphere discharge line of the gas analyzer while purging the inside of the conduit.

After purging in this way for an appropriate amount of time,
Turn the handle 39 to move the valve stem 27 forward and remove the valve body 2.
9 is seated on the valve seat 23 and the gas inlet 22 is closed. As a result, the gas inlet 22 and the gas outlet pipe 2
4 is cut off, and the ground nut 38
The side seal ring 33 is located closer to the valve seat 23 than the purge gas introduction pipe 25, and the purge gas introduction pipe 25
and the purge gas flow path 31 are cut off.

Then, open the container valve to draw out the gas to be analyzed from the gas container, and turn the handle 39 to release the valve stem 2.
7, the distance between the valve body 29 and the valve seat 23 is adjusted appropriately so that the desired flow rate of the gas to be analyzed passes through the annular passage 41, and the flow passage on the gas analyzer side is also changed from the atmospheric discharge side to the measurement side. Switch to. In this way, the desired flow rate of the gas to be analyzed is introduced into the gas analyzer without containing undesirable extra components in the atmosphere, and gas analysis is performed.

In addition, in the operation of retracting the valve stem 27 in order to lead the gas to be analyzed to the gas analyzer, it is important that the seal ring 33 on the gland nut 38 side is always positioned closer to the valve seat 23 than the purge gas introduction pipe 25. be. If the valve rod 27 is moved back too much and the purge gas introduction pipe 25 and the purge gas flow path 31 communicate with each other, the purge gas will mix into the gas to be analyzed, which is inconvenient. For this reason, the valve stem 27 or handle 39
Appropriate marks are placed on the buttons to enable accurate operations.

In the above embodiment, the valve body 29 is shaped like an inverted cone to enable adjustment of the flow rate of the gas to be analyzed. However, the shape of the valve body of the present invention is not limited to this, and the valve body 29 can be formed in any case where the flow rate can be adjusted using a gas analyzer or the like. It is sufficient if the gas inlet can be opened and closed simply by using a flat plate shape.

Further, the cap nut 26 that covers the gas inlet 22 is not necessarily limited to the cap nut 26, and an appropriate coupling means can be selected according to the container valve of the gas container to be analyzed. If it is a type, a screw may be provided around the gas inlet, that is, in the body at one end of the valve box.

Furthermore, the position of the threaded portion 28 of the valve stem 27 is not limited, and may be provided at any position that does not affect the formation of the compartment 35, for example, it may be configured to be screwed together at the gland nut 38 portion. Further, in this embodiment, the handle 39 is fixed to the outer end of the valve stem 27, and by rotating the handle 39 and the valve stem 27 at the same time, the valve stem 27 is moved forward and backward via the threaded portions 28 and 32. However, the structure for advancing and retracting the valve stem is not limited to this, and other types are possible. For example, the handle and the valve stem are separated and abutted through a diaphragm, and the valve stem is urged toward the other end of the valve box by a spring and inserted into the valve chamber in an airtight manner, and the handle is turned. The spring is compressed by compressing the spring, and the valve stem moves forward, and by turning the handle in the opposite direction to reduce the pressure on the spring, the spring is expanded, and the valve stem moves back. You may.

[Effect of idea]

As described above, the analytical valve according to the present invention has a valve seat formed around the valve chamber opening of the gas inlet bored at one end of the valve box, and the valve seat is formed in order from the gas inlet to the other end of the valve box. A gas outlet pipe and a purge gas inlet pipe are provided which penetrate the body of the valve box and communicate with the valve chamber, and a valve stem having a valve body at its tip that seats on the valve seat and closes the gas inlet port is attached to the other end of the valve box. A gland member provided on the valve body allows the valve to move forward and backward in an airtight manner, and an elongated protrusion extending from the tip of the valve body is loosely inserted into the gas inlet to create a purge gas flow path that has an inlet on the circumference of the valve stem and an outlet at the tip of the elongated protrusion. A seal ring is formed in the rod and the elongated protrusion, and seal rings are attached to the circumferential surface of the valve stem so as to be movable together with the valve stem, respectively, on the gland member side and the valve body side across the inlet of the purge gas flow path. The space formed by the inner surface of the valve chamber and the inner surface of the valve chamber are airtightly partitioned to define a compartment, and when the valve body moves toward the gland member, the seal ring on the gland member side On the gland member side, the seal ring on the valve body side is located closer to the valve seat than the purge gas introduction pipe, so that the purge gas introduction pipe and the purge gas passage communicate with each other via the compartment, and the valve body is located on the valve seat side. When the purge gas introduction pipe is moved, the purge gas introduction pipe and the purge gas flow path are shut off by the seal ring on the gland member side, which is located closer to the valve seat than the purge gas introduction pipe, so the purge valve can be installed in the valve box of a conventional analysis valve. The structure is simpler than an attached one, and the purge operation using purge gas and the operation of introducing the gas to be analyzed into the gas analyzer after the purge operation can be performed with one valve operation, eliminating the need for complicated valve operations.

[Brief explanation of the drawing]

FIG. 1 is a central vertical sectional view showing an embodiment of the analysis valve of the present invention, and FIG. 2 is a partially cutaway perspective view showing an example of a conventional analysis valve. 20... Valve box, 21... Valve chamber, 22... Gas inlet, 23... Valve seat, 24... Gas outlet pipe, 25
... Purge gas introduction pipe, 26 ... Cap nut, 27
... Valve stem, 29 ... Valve body, 30 ... Elongated projection, 3
DESCRIPTION OF SYMBOLS 1... Purge gas flow path, 33, 34... Seal ring, 35... Compartment chamber, 36... Gland packing, 37... Packing retainer, 38... Grand nut.

Claims (1)

[Scope of utility model registration request] A gas inlet that communicates with the valve chamber is bored at one end of the valve box, a valve seat is formed around the valve chamber opening of the gas inlet, and the valve seat is formed in order from the gas inlet to the other end of the valve box. A gas outlet pipe and a purge gas inlet pipe are provided which penetrate through the body of the box and communicate with the valve chamber, and a valve stem having a valve body at its tip that seats on the valve seat and closes the gas inlet port is provided at the other end of the valve box. A purge gas flow path is provided, which is airtight and movable back and forth by a ground member provided, and has an elongated protrusion extending loosely into the gas inlet at the tip of the valve body, and has an inlet on the circumferential surface of the valve stem and an outlet at the tip of the elongated protrusion. A seal ring is formed in the valve stem and the elongated protrusion, and seal rings are attached to the circumferential surface of the valve stem so as to be movable together with the valve stem, respectively, on the gland member side and the valve body side across the inlet of the purge gas flow path. The space formed by the surface and the inner surface of the valve chamber is airtightly partitioned to define a compartment, and when the valve body moves toward the gland member, the seal ring on the gland member side is separated from the purge gas introduction pipe. The seal ring on the gland member side is located closer to the valve seat than the purge gas introduction pipe, and when the valve body moves toward the valve seat, the seal ring on the gland member side is located on the purge gas introduction pipe. An analytical valve characterized in that both seal rings are arranged so as to be located closer to the valve seat than the valve seat.