JPS6212959Y2 - - Google Patents

Description

[Detailed explanation of the idea]

This invention relates to a liquefied gas container valve to which a siphon pipe is attached, and more specifically, when filling the filling container with liquefied gas through the container valve, a portion of the liquefied gas is flashed into the container to shorten the filling time and improve safety. The present invention relates to a container valve as described above. A conventional embodiment in which a siphon pipe is attached to a container valve that is screwed onto the mouthpiece of a filling container is used to fill a liquefied gas filling container valve B that is screwed onto the mouthpiece of a liquefied gas filling container A, as shown in FIG. A siphon pipe C was screwed and attached to the tip of the water channel B1. When filling the filling container with liquefied gas through this siphon pipe, the entire amount of liquefied gas is filled from the liquefied gas filling port B2 of the valve body into the liquefied gas filling container through the liquefied gas filling channel and the siphon pipe. During this filling, when liquefied gas is introduced into the container from the lower end of the siphon tube, the gas remaining in the container is compressed by the liquefied gas introduced. As a result, the gas temperature in the shoulder A1 of the container rises rapidly and the internal pressure of the container increases, causing the filling set pressure (for example, 40
To fill a container with a specified amount of liquefied gas at ~50 Kg/cm ² G), it takes 1.5 to 2 times as long to fill the container as compared to filling without a siphon pipe. Especially when the outside temperature is high, even if the set filling pressure is increased (for example, 50 to 60 kg/cm ² G), the filling time will be significantly longer in proportion to the filling pressure. Furthermore, if the filling pressure is increased, the pulsation between the filling header and the piping increases, which is unsatisfactory in practical terms, such as increasing the danger of work. This invention was devised for the purpose of overcoming the drawbacks of the container valve equipped with a siphon pipe as described above. In order to achieve the above object, this invention newly provides a liquefied gas flush passage in the valve body that communicates with the liquefied gas filling passage of the container valve. The advantages of providing the liquefied gas flush channel in this way are: (1) When filling the liquefied gas, a portion of the liquefied gas is flushed through the liquefied gas flush channel, so that the inner wall surface of the shoulder of the filling container (2) The liquefied gas can be filled into the container through a siphon pipe while keeping the pressure inside the container low; (3) The filling time is short. This invention brings about effects unique to this invention, such as being able to be done quickly and safely. Figure 2 shows an example of this invention.
Reference numerals corresponding to those in FIG. 1 are represented in the same way. In FIG. 2, a liquefied gas filling channel B1 communicates with the valve body of the container valve B, and a siphon pipe C is screwed into the tip of this channel. A bulging part is provided on the side of the valve body, and a liquefied gas flushing inflow passage 1 is bored into the bulging part from the outside of the valve body so as to look into the liquefied gas filling passage B1. The tip portion communicates with the liquefied gas filling channel B1.
A liquefied gas flushing passage 2 is communicated from the bottom end of the valve body toward the liquefied gas flushing inflow passage 1, and a spring 3 is installed at the intersection of both passages 1 and 2.
A ball 4 which is actuated by the biasing force is installed inside to open and close the liquefied gas flash passage 2. The other end of the spring 3 is brought into contact with a plug 6 that is screwed into a fitting hole bored in the center of a screwed lid 5 that is screwed into the bulge. In this way, the ball 4, spring 3, lid 5, and plug 6 constitute a check valve. The repulsive force of the spring 3 is adjusted by the degree of screwing of the plug 6. With the above configuration, the liquefied gas filled from the liquefied gas filling port B2 is filled into the container A through the siphon pipe C from the liquefied gas filling channel B1 provided in the valve body, and the liquefied gas A part of the liquefied gas is press-fitted into the flushing inlet passage 1, and the press-fitting pressure overcomes the repulsive force of the spring 3, moves the ball 4 toward the plug 6, and opens the inlet of the liquefied gas flushing passage 2. It flows through the flow path and flashes into the container A, lowering the temperature of the residual gas in the shoulder A1 of the container. As the material of the ball 4, SUS or Teflon (trade name (polytetrafluoroethylene)), which is a low-temperature material that is neither brittle nor corrosive, is used. The table below shows the experimental results of the filling time when a 30 kg container was filled with liquefied carbon dioxide using the container valve of this invention and the conventional container valve shown in Figure 1. Filling pressure is 50
Kg/cm ² G. Note that the diameter in the table indicates that of the liquefied gas flush flow path. The inner diameter of the liquefied gas flush inflow channel was 1 mm.

[Table] As the table shows, the filling time varies depending on the diameter of the liquefied gas flush channel.
It is desirable to appropriately determine the diameter in consideration of the capacity of the filled container and the characteristics of the liquefied gas. In addition, when using a conventional valve, the specified filling amount is 70
% was easily filled, but the remaining 30% was difficult to fill. In addition, when the liquefied carbon dioxide gas filled in the filling container is extracted, the liquefied gas flushing channel is blocked by a ball due to the repulsive force of the spring, so it is carried out through the siphon pipe C attached to the container valve. Therefore, the original function of the siphon tube is not impaired in any way. Although the above example describes the case of filling with liquefied carbon dioxide gas, it can also be applied to filling with other liquefied gases. In addition, the container valve of this invention can be used for all siphon pipe-mounted liquefied gas filled containers (e.g., seamless containers, welded containers, low-temperature containers, ultra-low temperature containers, etc.)
It has the advantage of eliminating problems when filling liquefied gas.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a conventional container valve for attaching to a siphon pipe, and FIG. 2 is a sectional view showing a container valve of the present invention. Explanation of symbols, B1...Liquid gas filling channel, B
2...Liquefied gas filling port, C...Siphon pipe, 1...
...Liquefied gas flush inflow channel, 2...Liquefied gas flash flow channel, 3...Spring, 4...Ball, 5...Lid body, 6...Plug.

Claims (1)

[Scope of utility model registration request] In a container valve that is screwed onto the mouthpiece of a liquefied gas filling container and has a siphon pipe attached, a liquefied gas flushing valve is provided from the outside of the valve body toward the liquefied gas filling channel B1 provided in the valve body of the container valve B. The inlet passage 1 is connected to the liquefied gas flush inlet passage 1, and the liquefied gas flush inlet passage 2 is communicated from the bottom end of the valve body, and the spring 3, the ball 4, and the lid 5 are connected to the passage 2. A liquefied gas container valve for mounting on a siphon pipe, which is provided with a check valve consisting of a plug 6 screwed into the center part, and the ball opens and closes the liquefied gas flush passage 2 by the bias of a spring.