JP6425442B2 - Ball valve - Google Patents

Description

  The present invention relates to a ball valve, and more particularly, to equipment that is connected to a water pipe, such as a fire hydrant, etc., the downstream pipe is removed when water is not used, and the downstream pipe is connected and used when used. The present invention relates to a ball valve suitable for use.

  There is a ball valve as one of the valves used for water supply. The ball valve receives a ball provided with a through hole in a valve body provided with an inlet and an outlet, and operates and rotates the ball from the outside of the body to switch water flow and water blocking. It is. By the way, a fire hydrant is installed in the town etc. for fire extinguishing. In this fire hydrant, there are one and multiple discharge ports, and in the case of a dual-port fire hydrant with two discharge ports, in addition to the main valve for switching the blocking water of the fire hydrant itself. A switching valve is attached to each discharge port, and one side is normally open and the other side is closed, and a fire hose is connected to the open side for use. If water supply from the other side is also required, connect the fire hose and use the switching valve open. In cold places, etc., the main valve is closed after use to drain water in some way to prevent freezing of the water remaining in the fire hydrant, but air is fed from the discharge port and through the drain pipe Sometimes the water inside the fire hydrant is drained.

  Although it is possible to use various types of valves as the above-mentioned on-off valve, there is a butterfly valve as one of the valves actually used. This is because the pressure loss is small and a sufficient flow rate can be secured. In a butterfly valve used for a fire hydrant installed on the ground in a cold area or the like, there are many sheets made of metal as a sheet for sealing the periphery of the disc when the valve is closed. This seems to be because the sheet is always exposed to the open air when used for the discharge port of the fire hydrant, and problems such as deterioration are large in rubber and the like. However, if the sheet is made of metal, it requires extremely sophisticated adjustment and manufacturing techniques to obtain an excellent sealing property between the disc and the sheet, and even a considerable number of skilled workers can considerably produce the disc and sheet. Time consuming and expensive.

  Although examined by the applicant, no document has been found that points out the above problems and refers to the technical problem of solving the problems.

  The present invention has been made in view of the above-mentioned conventional problems. For example, it is connected to a water pipe such as a fire hydrant, and the pipe on the downstream side is removed when water is not used, and the pipe on the downstream side is connected and used It is an object of the present invention to provide an inexpensive valve which is suitable for use in such equipment, easy to manufacture, and inexpensive.

In order to solve the above-mentioned subject, the present invention provides a ball valve which consists of the following composition. That is, according to the present invention, a valve main body provided with a ball receiving chamber provided therein, an inlet and an outlet communicating with the ball receiving chamber, and an internal flow path disposed in the ball receiving chamber and penetrating the inside A ball valve having a ball valve body, the ball valve being opened and closed by rotating the ball valve body , wherein the outlet is offset downward with respect to the inlet and the ball valve body is The vent is formed in the lower portion of the ball valve, the vent communicating with the internal flow passage at one end, and the other end facing the outlet when the ball valve is in the closed position, A discharge hole communicating the flow passage and the ball receiving chamber is formed, and a drain hole communicating the lower portion of the ball receiving chamber and the lower portion of the outlet is formed in the valve body, and the ball valve Regardless of the open / close status of Said discharge hole, the ball collection chamber, and through the drainage hole, the internal channel is in communication with the outlet port.

  As is apparent from the above, the ball valve according to the present invention is obtained by adding a simple additional configuration to a normal ball valve, and in the manufacture thereof, advanced adjustment techniques and the like requiring exceptional skill are required. Instead, it can be manufactured inexpensively. In addition, since water in the valve is automatically drained regardless of the opening and closing of the valve, freezing can be prevented in a cold area or the like.

It is a fragmentary sectional view of a fire hydrant which installed a ball valve concerning the present invention. In the sectional view of the ball valve concerning the present invention, the state where the valve was opened is shown. It is a sectional view showing the state where a valve was closed.

  The ball valve of the present invention will be described below with reference to the drawings. 1 is a partial longitudinal sectional view of a fire hydrant equipped with a ball valve according to the present invention, FIG. 2 and FIG. 3 are longitudinal sectional views of the ball valve, FIG. 2 is a state in which the valve is open, and FIG. It shows.

  In FIG. 1, the fire hydrant 1 is provided with a fire hydrant main body 2 shown by omitting the lower part, the cap 3 is detachably attached to the upper part, and the main valve not shown is removed by rotating the spindle 4 by removing this. It can be opened and closed. The code | symbol 5 is a discharge port, and the ball valve 11 which concerns on this invention is attached there. The fire hydrant 1 is of a double-opening type, and the same ball valve 11 is attached to another discharge port not shown. A so-called Machino-type coupling 6 used to connect a fire hose is attached to the ball valve 11, and a cap 7 is further placed thereon.

  Next, the configuration of the ball valve 11 will be described with reference to FIG. Reference numeral 12 denotes a valve main body, which is configured by integrating the main body 13 and the presser 14, and forms a valve body receiving chamber 15 inside. An inlet 16 is formed in the main body 13, and an outlet 17 is formed in the presser 14. The inlet 16 and the outlet 17 are provided at substantially opposite positions and communicate with the valve body receiving chamber 15. In the case of a normal ball valve, the inlet and the outlet are formed to face each other at the same position in the vertical direction in the figure, but in the present embodiment, the outlet 17 is slightly lower than the inlet 16 It is formed to be offset. And the drainage hole 18 which connects the valve body receiving chamber 15 to the outflow port 17 is formed in the lower part of the presser 14.

  Reference numeral 21 denotes a ball valve, which is received by the primary side seat 29 and the secondary side seat 30 and rotatably received in the valve body receiving chamber 15. The ball valve body 21 is formed with a known internal flow passage 22 having a primary side opening 23 and a secondary side opening 24. Reference numeral 25 denotes a lateral hole, which extends laterally from a substantially central position of the internal flow passage 22 in a direction perpendicular to the internal flow passage 22 to the outer periphery of the ball valve body 21 and communicates with the valve body receiving chamber 15. A bottom hole 26 also extends downward from a substantially central position of the inner flow passage 22 in a direction perpendicular to the inner flow passage 22 to the outer periphery of the ball valve body 21 and communicates with the valve body receiving chamber 15.

Reference numeral 31 denotes a spindle inserted into a spindle insertion hole formed in the upper portion of the main body 13, the lower end of which is cut from both sides and formed into an elongated rod shape having a rectangular cross section, and that portion is formed in the ball valve body 21 The spindle 31 and the ball valve body 21 are integrally rotated by being inserted into a slit having a rectangular cross section. Reference numeral 32 denotes a spindle presser, which is screwed into the spindle insertion hole to prevent the spindle 31 from coming off. Reference numeral 33 denotes a handle, which is coupled to the head of the spindle 31 using a bolt 34. Reference numeral 35 denotes a handle guide having a square hole, which is fitted to the spindle 31 at the square hole and cooperates with a locking portion (not shown) formed on the inner periphery of the spindle hole. Rotation of the spindle 31 is limited to 90 degrees. In order to rotate the spindle 31, a handle bar is inserted into a lateral hole of the handle 33. The above configuration is known, and further detailed description will be omitted.

As mentioned above, FIG. 2 shows the state where the ball valve 11 is open. In FIG. 1, the cap 7 is removed, a hose for fire service is connected using a Machino type coupling 6, the ball valve 11 is opened, and the main valve is opened to release water. At that time, water flows in from the inlet 16 of the ball valve 11 and flows to the outlet 24 through the internal flow passage 22 of the ball valve body 21, but a part of the water is an internal flow passage of the ball valve 21. In the middle of 22, it flows from the side hole 25 and the bottom hole 26 to the valve body receiving chamber 15, and from there it flows to the outlet 17 through the drainage hole 18.

FIG. 3 shows the state in which the ball blob 11 is closed. When the fire fighting is over, the main valve of the fire hydrant is closed first. In this state, water remaining in the internal flow path 22 of the ball valve 11 regardless of the open / close state of the ball valve 11 flows from the bottom hole 26 serving as a discharge hole to the valve body receiving chamber 15, and remains originally in the valve body receiving chamber 15. It flows from the drainage hole 18 to the outlet 17 together with the water that has been drained, and is drained. In this case, since the lateral holes 25 become air holes and external air flows in, the water in the ball valve body 21 is also discharged quickly and completely. Since this drainage is performed naturally when the main valve is closed, drainage of the fire hydrant as described above, that is, water inside the fire hydrant performed by sending air from the discharge port through the drainage pipe is forgotten Even in this case, automatic drainage inside the ball valve 11 is performed. In addition, even if the ball valves are both closed for some reason and the main valve is left without being closed as it is, automatic drainage within the ball valve 11 is performed. Thus, in any case, it is possible to prevent the freezing of the ball valve 11.

Claims (1)

A ball body provided with a ball receiving chamber provided inside, a valve main body provided with an inlet and an outlet communicating with the ball receiving chamber, and a ball valve body provided in the ball receiving chamber and provided with an internal flow passage penetrating the inside with the door, in a ball valve for opening and closing by rotating the ball valve body, said outlet port is offset downwards relative to said inlet, said ball valve body, through the internal passage at one end, It is formed in the lower part of the ball valve body, and the vent hole which the other end will face to the outflow port when the ball valve body is positioned in the closed position, and communicates the internal flow path and the ball receiving chamber. A drain hole is formed, and a drain hole communicating between a lower portion of the ball receiving chamber and a lower portion of the outlet is formed in the valve body ,
A ball valve characterized in that the internal flow passage communicates with the outlet through the discharge hole, the ball receiving chamber, and the drainage hole regardless of the open / close state of the ball valve.

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