JP2016023783A - Ball valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a less-expensive valve which can be easily manufactured and is preferably used for a mechanical unit such as a fireplug connected to a flue pipe in which a downstream side pipe is removed when water is not used and in turn the downstream side pipe is connected when water is used.SOLUTION: This invention relates to a ball valve 11 comprising: a ball storing and receiving chamber 15 located inside; a valve main body 12 provided with an inlet port 16 and an outlet port 17 communicating with the ball storing and receiving chamber 15; and a ball valve body 21 located in the ball storing and receiving chamber 15 and provided with an internal flow passage 22 passing therethrough. The outlet port 17 is offset downwardly with respect to the inlet port 16. In the ball valve body 21, there are formed an aeration hole 25 communicated with the internal flow passage 22 at one end and placed adjacently to the outlet port 17 at the other end when the ball is positioned at the closed position and a discharging hole 26 formed at the lower part of the ball valve body 21 and communicating with the internal flow passage 22 and the ball storing and receiving chamber 15. The valve main body 12 has a drain hole 18 formed communicating between the lower part of the ball storing and receiving chamber 15 and the lower part of the outlet port 17.SELECTED DRAWING: Figure 2

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, and that a downstream pipe is removed when water is not used and a downstream pipe is connected when used. The present invention relates to a ball valve suitable for use.

  One of the valves used for water supply is a ball valve. A ball valve receives a ball with a through hole in a valve body having an inlet and an outlet, and operates and rotates the ball from the outside of the body to switch between water flow and water stop. It is. By the way, fire hydrants are installed in towns for fire extinguishing. There are two types of fire hydrants, one with a number of outlets and two with two outlets, in addition to the main valve for switching the stop water of the hydrant itself. A switching valve is attached to each discharge port, and one is normally open and the other is closed. A fire hose is connected to the open side. If water supply from the other side is required, connect the fire hose and open the switching valve. To avoid freezing of water remaining in the fire hydrant in cold districts, etc., drain the water by some method after closing the main valve after use, but send air from the discharge port through the drain pipe. Water may be drained inside the fire hydrant.

  Although various types of valves can be used as the 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 region or the like, a metal sheet is often used as a sheet for sealing the periphery of the disk when the valve is closed. This is presumably because the sheet is always exposed to the outside air when used at the discharge port of a fire hydrant, so that problems such as deterioration are significant when made of rubber. However, when the sheet is made of metal, extremely high adjustment and production techniques are required to obtain an excellent sealing property between the disk and the sheet. It takes a lot of time and is expensive.

  As a result of examination by the applicant, no literature was found that pointed out the above-mentioned problems and referred to the technical problem of solving the problems.

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

In order to solve the above problems, the present invention provides a ball valve having the following configuration. That is, the present invention comprises a ball receiving chamber provided inside, a valve body provided with an inlet and an outlet leading to the ball receiving chamber, an internal flow path disposed in the ball receiving chamber and penetrating through the interior. A ball valve that opens and closes by rotating the ball, and is characterized in that the outlet is offset downward with respect to the inlet, A vent hole is formed in the lower portion of the ball valve body, the other end of the ball facing the outflow port when the ball is positioned at the closed position, and the inner channel and the ball receiving portion. A discharge hole that communicates with the chamber is formed, and a drainage hole that communicates between a lower portion of the ball receiving chamber and a lower portion of the outlet is formed in the valve body.

  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 requires advanced adjustment technology that requires special skill in the manufacture thereof. In addition, it can be manufactured at low cost. In addition, the water in the valve is automatically drained regardless of whether the valve is opened or closed, so that freezing can be prevented in cold regions.

It is a fragmentary sectional view of the fire hydrant which installed the ball valve concerning the invention in this application. It is sectional drawing of the ball valve which concerns on this invention, and shows the state by which the valve was opened. It is sectional drawing which shows the state in which the valve | bulb 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, FIGS. 2 and 3 are longitudinal sectional views of the ball valve, FIG. 2 shows a state in which the valve is opened, and FIG. 3 shows a state in which the valve is closed. Show.

  In FIG. 1, a fire hydrant 1 includes a fire hydrant main body 2 that is shown with its lower part omitted, and a cap 3 is detachably attached to the upper part of the hydrant main body. Can be opened and closed. Reference numeral 5 denotes a discharge port, to which a ball valve 11 according to the present invention is attached. This fire hydrant 1 is a double-mouth type, and the same ball valve 11 is attached to another discharge port (not shown). The ball valve 11 is provided with a so-called Machino-type coupling 6 used for connecting a fire hose, and is further covered with a cap 7.

  Next, the configuration of the ball valve 11 will be described with reference to FIG. Reference numeral 12 denotes a valve body, which is configured by integrating a body 13 and a presser 14 and forms a valve body receiving chamber 15 therein. An inlet 16 is formed in the main body 13, and an outlet 17 is formed in the presser 14. The inflow port 16 and the outflow port 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 inflow port and the outflow port are formed to face each other at the same position in the vertical direction in the figure, but in this embodiment, the outflow port 17 is slightly below the inflow port 16. It is formed by offset. A drain hole 18 that connects the valve body receiving chamber 15 to the outlet 17 is formed below the presser 14.

  Reference numeral 21 denotes a ball valve body which is received by the primary side seat 29 and the secondary side seat 30 and received in the valve body receiving chamber 15 so as to be rotatable. A known internal flow path 22 having a primary side opening 23 and a secondary side opening 24 is formed in the ball valve body 21. Reference numeral 25 denotes a horizontal hole extending from the substantially central position of the internal flow path 22 to the outer periphery of the ball valve body 21 in a direction orthogonal to the internal flow path 22 and leading to the valve body receiving chamber 15. Reference numeral 26 denotes a bottom hole, which also extends downward from the substantially central position of the internal flow path 22 to the outer periphery of the ball valve body 21 in a direction orthogonal to the internal flow path 22 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, and the lower end thereof is cut from both sides to form a long and narrow bar with a square cross section, and that portion is formed on 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 square cross section. Reference numeral 32 denotes a spindle press 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 in which a square hole is formed. The handle guide fits into the spindle 31 at the square hole portion and cooperates with a locking portion (not shown) formed on the inner periphery of the spindle hole. Thus, the rotation of the spindle 31 is limited to 90 degrees. The spindle 31 is rotated by inserting a handle bar into a lateral hole of the handle 33. The above configuration is publicly known, and further detailed description is omitted.

As described above, FIG. 2 shows a state in which the ball valve 11 is open. In FIG. 1, when the cap 7 is removed, a fire hose is connected using the Machino-type coupling 6, the ball valve 11 is opened, and water is released when the main valve is opened. 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 path 22 of the ball valve body 21, but a part of the water flows into the internal flow path of the ball valve body 21. In the middle of 22, it flows from the lateral hole 25 and the bottom hole 26 to the valve body receiving chamber 15, and from there to the outlet 17 through the drain hole 18.

FIG. 3 shows a state where the ball blob 11 is closed. When the fire fighting is over, the main valve of the fire hydrant is first closed. In this state, water remaining in the internal flow path 22 of the ball valve 11 regardless of the open / closed 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 originally remains in the valve body receiving chamber 15. It flows from the drain hole 18 to the outlet 17 together with the water that has been drained and drained. In this case, since the lateral hole 25 becomes a vent hole and external air flows in, the water in the ball valve body 21 is also quickly and completely discharged. Since this drainage is naturally performed when the main valve is closed, the above-mentioned drainage of the fire hydrant, that is, the drainage of water inside the fire hydrant performed through the drain pipe by sending air from the discharge port is forgotten. However, automatic drainage of the ball valve 11 is performed. Further, even if both ball valves are closed for some reason and the main valve is left as it is without being closed, automatic drainage of the ball valve 11 is performed. In this way, freezing of the ball valve 11 can be prevented in any case.

Claims (1)

A ball receiving body provided inside, a valve body including an inlet and an outlet leading to the ball receiving chamber, and a ball valve body provided in the ball receiving chamber and having an internal flow path penetrating the inside A ball valve that opens and closes by rotating the ball, wherein the outlet is offset downward with respect to the inlet, and the ball communicates at one end with the internal flow path, and the ball is closed. A vent hole whose other end faces the outflow port when positioned at the position, and a lower part of the ball valve body, and a discharge hole that connects the internal flow path and the ball receiving chamber is formed, The ball valve is characterized in that a drainage hole is formed in the valve body to communicate between a lower portion of the ball receiving chamber and a lower portion of the outlet.

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