JPH0227735Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention prevents large amounts of liquefied petroleum gas from being released from containers due to damage to liquefied petroleum gas equipment due to large earthquakes, wind and flood damage, snow damage, and other causes. This invention relates to a liquefied petroleum gas release preventer.

(Prior Art) Conventionally, this type of valve case has a gas passage connected to a liquefied petroleum gas container at one end and a gas pipe at the other end, and a valve case with one end opened to the gas passage and the other end connected to the gas pipe. A through hole is formed that opens on the outer circumferential surface, and a valve stem with a valve body is inserted into the gas passage, a slidable seat, and a spring arranged between the valve stem and the seat are inserted, and a return valve is inserted into the through hole. When the rod is inserted, the valve body opens due to the elastic force of the spring when the flow rate of gas flowing through the gas passage is below a predetermined value, and closes against the elastic force of the spring when the flow rate of gas flowing through the gas passage is greater than a predetermined value, and the valve body opens in the direction of the gas passage of the rod. It is known that the valve is opened by pressing the valve through a catch, a spring, and a valve stem.

This device operates to close the gas passage when the liquefied petroleum gas flow rate reaches a predetermined value, for example 4 kg/h, due to a gas hose being cut, a steel pipe joint breaking, a rubber tube being torn, etc. Even if there is no disconnection of the gas hose, the system is activated if the maximum gas consumption exceeds the predetermined value, and therefore is limited to equipment whose gas consumption is equal to or less than the predetermined value.

Therefore, if the maximum consumption of gas equipment is changed to above the predetermined value, it must be replaced with another one that has a different set value for the gas cutoff flow rate, which is inconvenient in that it is costly and requires time and effort to replace. It existed.

(Problems to be Solved by the Invention) The object of the present invention is to obtain a liquefied petroleum gas release preventer that does not have the above-mentioned disadvantages of the conventional method.

(Means for Solving the Problems) The present invention includes a gas passage connected to a valve case at one end to a liquefied petroleum gas container and at the other end to a gas pipe;
A valve stem having a through hole with one end opening to the gas passage and the other end opening to the outer circumferential surface of the valve case, and having a valve body in the gas passage, a slidable seat, and a space between the valve stem and the seat. The valve element is opened by the elastic force of the spring when the flow rate of gas flowing through the gas passage is less than a predetermined value, and is opened by the elastic force of the spring when the flow rate of gas flowing through the gas passage is less than a predetermined value. In a valve that closes against force and opens via a catch, a spring, and a valve stem when the rod is pressed in the direction of the gas passage,
The rod is pressed outward by a spring to abut the stopper, and the tapered tip of the rod is brought into contact with the seat, so that the contact position of the tip of the rod with the seat changes. It is characterized in that the stopper is movable along the axial direction of the rod, and the flow rate of the gas that is closed by the valve body is variable.

(Example) Embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, 1 is a valve case, and the valve case 1 has a gas passage 2, an opening 2a at one end is connected to a liquefied petroleum gas container 3, and an opening 2b at the other end is connected directly or through a regulator. Each gas pipe 4 is connected to the gas pipe 4, and the gas passage 2 includes a hollow valve stem 6 equipped with a valve body 5, a slidable cylindrical seat 7, and a space between the valve stem 6 and the seat 7. The springs 9 arranged in the following manner were inserted. 10 is a through hole whose one end opens to the gas passage 2 and the other end opens to the outer peripheral surface of the valve case 1;
0 with the O-ring 11 interposed, and the return rod 1
2, and a cylindrical stopper 14 is screwed into a recess 13 formed on the outer peripheral surface of the valve case 1 and having a through hole 10 in the center, and the flange 1 of the return rod 12 is inserted.
5 and the recess 13
The return rod 12 is moved outward until the flange 15 comes into contact with the stopper 14 by the elastic force of the return rod 12, and its tapered tip 17 comes into contact with the seat 7. The valve body 5 is separated from the valve seat 8 by the elastic force of a spring 9 when the flow rate of gas flowing through the gas passage 2 is below a predetermined value, and is closed against the elastic force of the spring 9 when the flow rate is above a predetermined value. The tapered tip 17 of the return rod 12 has, for example, a shape in which the diameter gradually decreases in three steps as shown in the figure.

In the figure, 18 is a handle connected to the liquefied petroleum gas container 3.

Next, the operation of this embodiment will be explained.

The liquefied petroleum gas release preventer of the present invention is connected to the liquefied petroleum gas container 3 and the gas pipe 4, and the valve of the container 3 is opened. Since the gas flowing out from the container 3 flows through the gas passage 2 through the holes in the valve stem 6 and the seat 7 at a flow rate higher than a predetermined value, the valve body 5 comes into contact with the valve seat 8 and the gas flow is cut off. . Then, the return rod 12 is pressed downward to bring its large diameter portion into contact with the seat 7 to move the seat 7 to the left, and the elastic force of the spring 9 separates the valve body 5 from the valve seat 8. Since the gas flow rate decreases when the gas pipe 4 begins to fill with gas, the valve body 5 continues to be separated from the valve seat 8 even if the downward pressure of the return rod 12 is released. When the gas pipe 4 is cut, the flow rate of gas flowing through the gas passage 2 exceeds a predetermined value depending on the elastic force of the spring 9, so the valve is closed and the flow of gas is interrupted.

Now, when increasing the number of combustion appliances connected to the gas pipe 4, the stopper 14 is rotated and moved inward. The return rod 12 thus moves inward, and the larger diameter portion of the tip 17 moves the catch 7 to the left in the figure, causing the spring 9 to move inward.
The valve body 5 moves to the left via the valve body 5, and the gas flow rate at the time of shutoff increases. Therefore, the gas release preventer of the present invention will not malfunction.

Since the tip end 17 of the return rod 12 is formed so that the diameter becomes narrower in three steps, the set value of the gas flow rate for valve closing can be changed in three steps.

FIG. 2 shows another embodiment of the invention.

In this embodiment, an opening 2a at one end of the valve case 1 is connected to a liquefied petroleum gas container via a gas pipe (not shown), and an opening 2b at the other end is connected to a gas pipe 4 either directly or via a regulator. shall
A hollow valve stem 6 equipped with a valve body 5, a seat 7, and a spring 9 are inserted into the gas passage 2 in the valve case 1, and one end opens into the gas passage 2 and the other end opens into the valve. A return rod 12 is fitted into a through hole 10 opening on the outer peripheral surface of the case with an O ring 11 interposed therebetween, and its tapered tip 17 is brought into contact with the seat 7. The above is the same as the previous embodiment.

The valve case 1 is further rotatably fitted with a plug body 19 through a through hole 20 for opening and closing the gas passage 2 in the valve case 1.

Thus, according to this configuration, the liquefied petroleum gas release preventer and the pot are integrated, resulting in a small size. The function of the preventer is the same as in the previous embodiment.

In the illustrated embodiment, the distal end portion 17 is formed in a discontinuous tapered shape, but it may be formed continuously.

(Effects of the invention) According to the invention, even if the maximum consumption of gas equipment changes, there is no need to replace it with another one, so it is less expensive and easier to handle than conventional equipment. It has certain effects.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of one embodiment of the present invention, and FIG. 2 is a cross-sectional view of another embodiment of the present invention integrated with a pot. 1... Valve case, 2... Gas passage, 3... Liquefied petroleum gas container, 4... Gas pipe, 5... Valve body, 6...
... Valve stem, 7 ... Seat, 8 ... Valve seat, 9 ... Spring, 10 ... Through hole, 12 ... Return rod,
14...stopper, 16...spring, 17...
...Tip.

Claims (1)

[Scope of utility model registration request] The valve case is formed with a gas passage that connects one end to the liquefied petroleum gas container and the other end to the gas pipe, and a through hole that opens to the gas passage at one end and opens to the outer peripheral surface of the valve case at the other end. Then, a valve stem with a valve body, a slidable seat, and a spring disposed between the valve stem and the seat are inserted into the gas passage, and a return rod is inserted into the through hole, and the valve body When the flow rate of gas flowing through the passage is below a predetermined value, it opens due to the elastic force of the spring, and when it exceeds a predetermined value, it closes against the elastic force of the spring, and when the rod is pressed in the direction of the gas passage, the catch seat, In a valve that is opened via a spring and a valve stem, the rod is pressed outward by the spring to contact the stopper, and the tapered tip of the rod is brought into contact with the catch seat. Liquefied petroleum gas discharge characterized in that the stopper is movable along the axial direction of the rod so that the contact position of the catch at the tip of the rod changes, and the flow rate of the gas closed by the valve body is made variable. preventer.