JPH0517686Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a remote valve control device for high pressure gas, which controls the opening and closing of a remote valve used in a high pressure gas line.

[Conventional technology]

This type of conventional remote valve control device for high pressure gas is
It was constructed as shown in FIGS. 3 and 4.

FIG. 3 is a high-pressure gas line system diagram in which a high-pressure gas remote valve is installed. In Figure 3, 1
is a high pressure gas line, which is provided with a main valve 2. A bypass line 4 is connected to the high pressure gas line 1 via reducers 3a and 3b so as to bypass the main valve 2, and a bypass valve 5 is provided on the bypass line 4.
The main valve 2 is controlled to open and close by a solenoid valve 6, and the bypass valve 5 is controlled to open and close by a solenoid valve 7. Reference numeral 8 designates a differential pressure switch that operates when the pressure difference between the primary side P and secondary side S of the main valve 2 becomes smaller than a specified value.

FIG. 4 shows a drive circuit for driving and controlling the high-pressure gas remote valve arranged as shown in FIG. As shown in FIG. 4, the control power line L1,
A valve opening switch 11, a valve closing switch 12, and relays 13 and 14 are connected between L2.

Now, if you turn on the valve opening operation switch 11,
Relay 13 is energized and contact 13a is closed. Therefore, the relay 13 is self-maintained, and
The solenoid valve 7 is driven along a path indicated by symbol A. Therefore, the bypass valve 5 is opened. As the high pressure gas flows through the bypass line 4, the pressure on the secondary side S increases. When the pressure difference between the primary side P and the secondary side S becomes less than a specified value, the differential pressure switch 8 is turned on, the relay 14 is energized along the path indicated by symbol B, and the contact 14a is closed. Then, the solenoid valve 6 is driven along the path indicated by symbol C.
The main valve 2 of the high pressure gas line 1 is opened.

When the valve closing operation switch 12 is turned OFF, the excitation of the relay 13 is cut off, the solenoid valve 7 is reset, and the bypass valve 5 is closed. As a result, when the pressure difference between the primary side P and the secondary side S exceeds the specified value, the differential pressure switch 8 is turned OFF, the excitation of the relay 14 is cut off, the solenoid valve 6 is reset, and the main valve 2 is closed. becomes.

[Problem that the invention attempts to solve]

In the conventional high-pressure gas remote valve control device shown in FIGS. 3 and 4, in addition to the high-pressure gas line 1 and main valve 2, it is necessary to provide a bypass line 4 and a bypass valve 5 via reducers 3a and 3b. be. This resulted in problems such as a complicated configuration, lack of reliability, and increased equipment costs.

Therefore, the present invention has a simple configuration, high reliability,
Moreover, it is an object of the present invention to provide a remote valve control device for high-pressure gas that requires less equipment cost.

[Means for solving problems]

In order to solve the above problems and achieve the purpose, the present invention takes the following measures. That is, providing a first means for controlling a high pressure gas remote valve disposed in a high pressure gas line from a fully closed state to an open direction,
A stop means is provided for stopping the valve opening operation by the first means when the remote valve reaches a predetermined opening degree which is approximately intermediate. The remote valve is held at an intermediate predetermined opening degree by the stopping means, and a second operation is performed to fully open the remote valve when the pressure difference between the primary side and the secondary side of the remote valve becomes small. Provide means.

Here, the first means is a means for outputting an instruction to open the valve to a remote valve for high-pressure gas, and to put it simply, it may be a means to simply provide an on/off switch in the circuit, and the implementation described below is sufficient. In the example, it consists of a valve opening operation switch 31, a relay 33, a contact 33a, and a solenoid valve 21.

The stopping means is means for outputting an instruction to the remote valve to stop the valve opening operation when the degree of opening of the remote valve reaches a predetermined value, and to put it simply, the stopping means is a means that outputs an instruction to the remote valve to stop the valve opening operation when the opening degree of the remote valve reaches a predetermined value. It is sufficient if a limit switch is provided on the part that is driven by the motor, such as a connecting rod, and the drive part is turned off by the output of the limit switch.
In the embodiment described later, limit switch 2
4, a relay 34, and a contact 34b.

The second means detects a pressure difference between the primary side and the secondary side of the remote valve, and when this pressure difference falls below a predetermined value, the remote valve is instructed to open the remote valve again. The means for outputting to the valve is, simply put, a differential pressure switch that detects the pressure between the primary side and the secondary side of the remote valve, and the output turns on the drive section of the remote valve. In the embodiment described later, it consists of a differential pressure switch 25, a relay 35, a contact 35a, and a solenoid valve 22.

[Effect]

By taking such measures, the following effects are achieved. In other words, the remote valve temporarily stops at an intermediate opening degree, and then fully opens when the pressure difference between the primary side and the secondary side becomes small. This can be prevented with a single remote valve.

〔Example〕

FIGS. 1 and 2 are diagrams showing an embodiment of the high-pressure gas remote valve control device of the present invention.

FIG. 1 is a high-pressure gas line system diagram in which a high-pressure gas remote valve is installed. In Figure 1, 1
is a high-pressure gas line, which is equipped with an air-driven remote high-pressure gas valve 20. The remote valve 20 is controlled to open and close by electromagnetic valves 21 to 23, and its opening degree is stopped midway by a limit switch 24. 25 is a differential pressure switch that operates when the pressure difference between the primary side P and secondary side S of the remote valve 20 becomes smaller than a specified value.

FIG. 2 shows a drive circuit for driving and controlling the remote valve 20 arranged as shown in FIG. As shown in FIG. 2, a valve opening switch 31, a valve closing switch 32, and relays 33, 34, and 35 are connected between the control power lines L1 and L2.

Now, if you turn on the valve opening operation switch 31,
The relay 33 is energized, the contact 33a is closed, and the 33
b opens. Therefore, the relay 33 is self-held, and the solenoid valve 21 is driven along the path indicated by the symbol A. Note that at the same time, the energization of the solenoid valve 23 is cut off along the path indicated by symbol C. Solenoid valve 21
When the remote valve 20 is driven, the remote valve 20 is operated in the opening direction. Turning on the above-mentioned valve opening operation switch 31
The series of operations from the operation to the operation of the remote valve 20 in the opening direction is an operation corresponding to the first means of the present invention. When the opening degree of the remote valve 20 reaches the opening degree set by the limit switch 24, the limit switch 24 is turned on, the relay 34 is energized along the path indicated by symbol D, and the contact point 34b is opened. For this reason, the energization of the electromagnetic valve 21, which had been driven along the path indicated by the symbol A, is cut off. Therefore, the opening operation of the remote valve 20 is temporarily stopped at this point. The remote valve 20 is activated from the ON operation of the limit switch 24 described above.
A series of operations until the opening operation is once stopped is an operation corresponding to the stopping means of the present invention. As the remote valve 20 is opened at a predetermined opening degree, the pressure on the secondary side S gradually increases. and,
When the pressure difference between the primary side P and the secondary side S becomes less than a specified value, the differential pressure switch 25 is turned on. Therefore, the relay 35 is excited along the path indicated by symbol E, and the contact 35a is closed. At this time, the contact 33a of the relay 33 is in a closed state, so the symbol B
The solenoid valve 22 is driven along the path indicated by , and the remote valve 20 of the high-pressure gas line 1 is fully opened. The series of operations from the above-described ON operation of the differential pressure switch 25 to the fully opening of the remote valve 20 is the second embodiment of the present invention.
This is an operation corresponding to the means of

When the valve closing operation switch 32 is turned OFF, the excitation of the relay 33 is cut off, the contact 33a opens and the contact 33b closes. Therefore, the energization of the solenoid valves 21 and 22 is cut off, and the solenoid valve 23 is driven. As a result, the solenoid valve 23 becomes open, so the spring 26 attached to the remote valve 20
Air is released by the action of , and the remote valve 20 is fully closed.

According to this embodiment, there is no need to provide a bypass line and a bypass valve in the high-pressure gas line 1,
Only the single remote valve 20 can prevent a sudden pressure rise on the secondary side at the time of valve opening. Therefore, the configuration of the high-pressure gas line system is simplified, the reliability becomes high, and manufacturing is also easy and inexpensive.

Note that the present invention is not limited to the embodiments described above, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[Effect of idea]

According to the present invention, there is provided a first means for controlling a high-pressure gas remote valve disposed in a high-pressure gas line from a fully closed state to an open direction; When the opening degree is reached, a stop means for stopping the valve opening operation by the first means, and the remote valve, which is maintained at an intermediate predetermined opening degree by the stop means, are used to separate the primary side and the secondary side of the remote valve. By providing a second means for fully opening the remote valve when the pressure difference with the downstream side becomes small, a single remote valve can prevent the downstream pressure from rising rapidly when the valve is opened. Therefore, it is possible to provide a high-pressure gas remote valve control device that has a simple configuration, high reliability, and low equipment costs.

[Brief explanation of drawings]

Fig. 1 and Fig. 2 are diagrams showing an embodiment of the present invention, Fig. 1 is a high pressure gas line system diagram in which a remote valve for high pressure gas is installed, and Fig. 2 is a diagram of the remote valve for high pressure gas. FIG. 2 is a drive circuit diagram for driving and controlling the . Fig. 3 and Fig. 4 are diagrams showing conventional examples, Fig. 3 is a high pressure gas line system diagram in which a remote valve for high pressure gas is installed, and Fig. 4 is a diagram showing the drive control of the remote valve for high pressure gas. FIG. 1... High pressure gas line, 20... Remote valve for high pressure gas, 21-23... Solenoid valve, 24... Limit switch, 25... Differential pressure switch, 26... Spring, 30... Drive circuit, 31... Valve open operation switch, 32... Valve close operation switch, 33 to 35
……relay.

Claims (1)

[Scope of utility model registration request] a high-pressure gas remote valve disposed in a high-pressure gas line; a first means for controlling the remote valve from a fully closed state to an open direction; a stop means for stopping the valve opening operation by the first means when the valve opening is reached, and a stop means for stopping the valve opening operation by the first means, and a stop means for stopping the valve opening operation by the remote valve, which is maintained at an intermediate predetermined opening degree by the stop means. A remote valve control device for high-pressure gas, comprising: second means for fully opening the remote valve when the pressure difference becomes small.