JPS59159479A - Simultaneous closing preventive device of plural closed valves - Google Patents

Abstract

PURPOSE:To normally hold at least one closed valve in an opened condition, by enabling each closed valve to be opened and closed only by controlling a plural kind of keys, in the case of a device which can select a flow path by opening and closing the closed valves. CONSTITUTION:When a flow path is intended to be switched from A to B, closed valves V-B1 and V-B2 in the flow path B are opened to be locked. Next, removing keys (a), (d), (c), (b), these keys are inserted into locks A1 and A2, unlocking closed valves V-A1 and V-A2 to be enabled to move, and these valves are placed in a closed condition. That is, when the closed valve is placed in its closed condition, the key, being trapped by the lock, can not be removed, while if the valve is placed in its opened condition, the key can be removed. Using this removed key, the other closed valve is unlocked and can be closed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing simultaneous closing of multiple shutoff valves. Specifically, when multiple devices each equipped with shutoff valves on the upstream and downstream sides of the fluid flow path are arranged in parallel,
The present invention relates to a device for preventing the shutoff valves of each flow path from simultaneously closing the flow paths of a cover plate and ensuring that at least one piece of equipment is in operation.

For example, in oil refining and chemical industry plants, multiple pieces of equipment are arranged in parallel, some are operated and others are stopped, and when the need arises, the equipment can be switched by operating shutoff valves. In many cases, work such as repair or catalyst regeneration is carried out without stopping plant operations.

To operate the above shutoff valves, first open the shutoff valves installed on the upstream and downstream sides of the equipment that was inactive, then open the shutoff valves installed on the upstream L13 and downstream sides of the equipment that is about to go into hibernation. It is normal to follow the procedure of closing.
This operation itself is not difficult, but in a plan where many pipes come and go and there are many valves, it may be difficult to bend other valves while opening the valve or keep it open. Occasionally, the valve that should be closed may be accidentally closed.15
1 Ru.

Such erroneous operation is especially fatal for safety valves among various types of equipment. This is easy to understand if you consider that the safety valve is a device that operates when an abnormality occurs in the plant and the internal pressure horn becomes abnormally high, releasing the pressure and preventing the plant from being destroyed. will be done.

The relationship between safety valves and shutoff valves attached to pressure vessels is stipulated as follows.

[If a device is equipped with two or more safety valves and cannot be closed at the same time], a closing device (stop valve) is installed between the pressure horn container and the safety valve. I can't help it. ] (December 25, 1960, Base No. 1429) - For valves that must be kept open, take measures such as wrapping a chain around the handle (so that it cannot be closed by pulling it). However, in any case, there is a chance of erroneous operation when the chain is removed for switching, so it cannot be said to be a sufficient countermeasure. A method was devised to prevent erroneous operation by directly connecting the valves. Although this method prevented FFJ operation, it had the disadvantage that the lock of the closed valve was severely restricted.

The present invention was made with the intention of solving these problems.

The device for preventing simultaneous closing of multiple shutoff valves of the present invention has two or more sets in parallel, each consisting of a fluid handling device and a shutoff valve provided on the upstream and downstream sides thereof, to open and close the shutoff valves. In a device that can switch the flow path by
Each shutoff valve is configured so that it can be opened and closed only by operating multiple types of keys, and the keys required to open and close two shutoff valves in the same flow path are different from each other. Two 1s! It is common to the keys required to open and close the Jl and +G valves, and the multiple types of keys required to open and close one shutoff valve are characterized by combining keys such that the combinations are all different. and, thereby ensuring that at least one shutoff valve is kept open at all times.

For the safety valve installed in Plan 1~, if the type is open to the atmosphere, a shutoff valve should be placed only on the patient's stomach (but if it is connected to the stomach), a shutoff valve can also be placed on the outlet side. Therefore, in this case, the classification of suitable and unsuitable depending on the state of the shutoff valve is shown in Figure 1 to ■.In other words, cases ■ to ■ are suitable, and other conditions are suitable. For example, case ■ is inappropriate. (In the figure, the symbol of the shutoff valve is hollow, and the symbol of the shutoff valve is closed.) For example, when the equipment in the flow path is a safety valve. Embodiments of the present invention will now be described with reference to FIGS. 2 to 4.

These figures show the case where two shutoff valves are provided in the two flow paths to the right of the safety valve, and the closing is performed using four types of keys: A, ENT, C, and 2.

In FIG. 2, the shutoff valves V-A1 and V-
A2 is listening, and locks A1 and A2 are holding the state between 4' and 3'.

1-"・tsuku △1 is operated by X-m-(a) A> and (b), and 1-double tsuku A2 is operated by keys (c) and (d), respectively. Shutoff valves V-81 and V- of flow path B
1-32 is closed-C, and []-ticks B1 and B2 do not [21-tick] these. Lock B1 is key)
Lock B2 is operated using keys (c) J3 and ([1), respectively. □1”Tsuku closed 1
When the 1-valve is in the 4-position, the key is locked into them so that it cannot be removed.

Now, when we try to switch the flow path from A to B, in order to satisfy the condition that neither flow path is closed at the same time, we must first close flow path A while interrogating flow path B. . Then, as shown in FIG. 3, shutoff valves V-81 and V-82 of flow path B are opened.

Next, as shown in Figure 4 1, the shutoff valve V-B we just heard is
1 and V-B2 in the open position, key (A),
Extract (d), (c) and (b). Then, insert these keys into locks Δ1, f3 and A2 to release the locks, and close shutoff valves ■-A1 and V-A2 to 1l.
As much as possible, return to the open position. This completes the flow path switching.

As can be understood from the above explanation, when the valve is in the open state, the key is stuck in the lock and cannot be removed, and when the key is in the middle, the trap is closed and the key is in the open position. (Should be. - Then use this key to close the other valve.) By unlocking one valve and going back to the configuration that allows it to be closed for the first time, one of the valves can be closed. The shutoff valve for the road is always in the open state.

Shishi's principle can be applied when the number of channels exceeds 2. In the case of three channels, for example, the key combination ゎU shown in FIG. 5 is used. .

In this way, among the channels A, B, and 0, two channels 1i (B, F3J, and C in the illustrated example) are locked in an intermediate state. The shutoff valve for each flow path is (a) 1,
There are four types of keys: (B), (C), and (D). (・It opens and closes, but the combination of keys with the same ゎV is ``I.'' There are four types of keys, ``C-゛.'')

If this is expanded further, it will be possible to handle any increase in the number of flow channels. Figure 6 shows an example in which two keys of three types each are selected from six types of keys (A) to (F) and used to open and close shutoff valves at the front and rear of the equipment when applied to 10 channels. Show.

The mechanism for locking the shutoff valve into the intermediate state is arbitrary, but
-Give an example (1?iS shown in Figures 7 and 8)
Zukou's E" Tsuku was awarded the JII Award.

Figure 7 shows a state in which the lock bar 2 is advanced from the lock body 1, making it impossible for the shutoff valve pans 1 to 1 to rotate. It has become. In this state C, the key is removed and d
Unless the key is inserted, the lock bar will remain in the first or fourth position, and the shutoff valve will remain in between.

Insert and press 1-4, the screen 1-4 will appear as shown in Figure 8.
The flange rod 3 springs back, and the bar 2 can be moved back one time C'. As the lockper 2 moves backward, the handle of the shutoff valve becomes rotatable and can be closed. In this state, key 4 is not IkL:J. The mechanical structure for realizing the above-mentioned operation is well known in the technical field of cooks, and it is preferable to employ it.

It is optional to install the lock (C), but it is also possible to install the support 11 for the lock ()C1 if necessary, but it is usually done on the 3-way or bonnet 1 of the shut-off valve body. −←Two fixed distances will be sufficient.

According to the present invention, each shut-off valve has a +I1.1ff (
For example, if there is a significant i [cause 1]
(Even if the equipment is purchased, simultaneous closing of the flow path 11 can be reliably prevented.
\I can do it.

[Brief explanation of the drawing]

Figure 1 is a diagram showing suitability and unsuitability depending on the open/closed state of the shut-off valves when two safety valves having shut-off valves on both the inlet side and the outlet side are arranged in parallel 41. Tech~vIl is suitable, and ■ is an example of unsuitable. Figures 2 to 4. The figures are conceptual diagrams for explaining one embodiment of the present invention, in which flow path A is open and flow path B is closed in FIG. 2, and flow path A and flow path B are both closed in FIG. Time, work-
Figure C, Figure 1 does not show the state in which the channel A tab is closed and the channel B is open. Fifth, this is a conceptual diagram corresponding to FIG. 2, showing an example in which the present invention is applied to three flow paths. FIG. 6 is an explanatory diagram showing the disadvantages of key combinations and combinations when the present invention is applied to 19 channels I9. 7 and 8 show an example of a locking means suitable for miniaturization of the apparatus of the present invention, in which the negative 17 Δ represents the vertical front surface when the lock bar is advanced and locked. Figure 7B is a cross-sectional view of A in the I-I direction;
Figure Δ shows the lock bar retreating and locking W? A vertical cross-sectional view corresponding to FIG. 7A in the lζ state, and FIG. 8B are rightward cross-sectional views of the n=It force. V, -AI, -A2. V-B1 and v-B2...
・Shutoff valve ・△1.
Δ2. B111: (and B2...Lock 2...9 Lock Bar 4...Key patent applicant: JGC Corporation, agent: Souo Suga, patent attorney)

Claims (2)

[Claims] (1) A device in which two or more sets consisting of a fluid handling device and shutoff valves provided on the upstream and downstream sides thereof are arranged in parallel, and the flow path can be switched by opening and closing the shutoff valves. In J3, each shutoff valve is configured so that it can only be opened and closed by operating multiple types of keys, and the keys required to open two shutoff valves in the same flow path are different from each other. There are multiple types of keys that are common to the keys necessary to open and close two shutoff valves in other flow paths, and that are used to open and close one shutoff valve.
Combine keys so that all combinations are different
This is a patented device for preventing simultaneous closing of multiple closing valves, thereby ensuring that at least one closing valve is always kept open. (2) Simultaneous closure prevention Htm according to claim 1, wherein the device handling fluid is a safety valve.