JP4267128B2 - Exhaust valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention opens the valve when water is fed into the pipe, exhausts the air in the pipe, closes when the exhaust is finished, and opens when the pressure in the piping system drops to a vacuum state. The present invention relates to an exhaust valve that breaks a vacuum state by introducing external air.
[0002]
[Prior art]
A conventional exhaust valve is disclosed in Japanese Utility Model Publication No. 53-1622. This is a casing that forms a valve chamber with an inlet opening in the lower part and an outlet opening in the upper part, forming a valve seat between the valve chamber and the outlet, and forming a rib protruding inward on the valve chamber wall. A float receiver having a substantially cylindrical shape with a bottom and a through hole having a small opening area at the bottom is fixed inside the rib, and the float is arranged in a free state in the float receiver.
[0003]
The above-described conventional exhaust valve is in an open state in which when the water is first fed into the pipe, the float is separated from the valve seat and descends, and the air in the pipe flowing into the valve chamber from the inlet is provided between the ribs. The air is exhausted from the space through the upper end of the float receiver and from the through hole through the inside of the float receiver to the outlet. When exhaust is finished and water in the pipe flows into the valve chamber from the inlet, the float floats by the water flowing into the float receiver from the space between the ribs through the float receiver upper end and through the through hole. Sit on the seat and close the valve. In addition, when the pressure in the piping system drops to a vacuum state, the float moves away from the valve seat and descends, and external air flowing into the valve chamber from the outlet is passed through the through hole and through the float receiver. The vacuum state is broken by introducing into the pipe from the inlet through the space between the upper end and the rib.
[0004]
[Problems to be solved by the invention]
In the conventional exhaust valve, when the vacuum state is broken, the float does not drop sufficiently, and the valve is half open, or the on-off valve is repeated little by little, so the vacuum breaking ability is small and it takes time to break the vacuum. There was a problem. This is because most of the external air that flows into the valve chamber from the outlet flows straight into the float receiver and bounces back against the bottom of the float receiver, so that the float is lifted. Further, since the outside air that has entered the float receiver cannot pass through the through-hole, the pressure below the float in the float receiver rises and the float rises.
Therefore, the technical problem of the present invention is to provide an exhaust valve that has a large vacuum breaking ability and can be quickly broken.
[0005]
[Means for Solving the Problems]
The technical means of the present invention taken in order to solve the above technical problem is to form a valve chamber having an inflow opening in the lower part and an outflow opening in the upper part in the casing, and between the valve chamber and the outflow opening. A float receiver is formed by forming a valve seat, forming a rib projecting inwardly on the valve chamber wall, and providing a through hole having a substantially cylindrical shape with a bottom and a small opening area at the bottom inside the rib. The float is arranged in a free state therein, and a flow dividing member having a large number of small gaps is provided at the outlet.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Since the exhaust valve of the present invention is provided with a diversion member having a large number of small gaps at the outlet, the external air is decelerated by the diversion member and diffused into the valve chamber at a moderate speed from the large number of small gaps. . For this reason, external air is less likely to bounce off the bottom of the float receiver, and the pressure below the float in the float receiver is unlikely to rise. Therefore, it becomes difficult for the float to float, and the vacuum breaking ability is large, so that the vacuum breaking can be performed quickly.
[0007]
【Example】
An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 and 2). A lid 2 is fastened to the main body 1 with a bolt to form a casing having a valve chamber 3 therein. An inlet 4 is formed in the lower part of the main body 1, and an outlet 5 is formed in the upper part of the lid 2. The attachment member 7 is fixed with screws with the valve seat 6 interposed between the lid 2 and the valve seat 6.
[0008]
The main body 1 integrally has a plurality of ribs 9 protruding inwardly on the inner wall of the valve chamber 3, and a bottomed substantially cylindrical float receiver 10 is fixed to the inside of the ribs 9 with a snap ring. The bottom of the float receiver 10 has a through hole 11 having a small opening area that communicates the inside and outside. A spherical float 12 is placed in a free state in the float receiver 10.
[0009]
The flow dividing member 13 is fixed to the outlet 5 with a snap ring. As shown in FIG. 2, the diversion member 13 is formed by opening a large number of small gaps 14 communicating with the upper and lower sides of a disk-shaped thin plate. The flow dividing member 12 may be made of a steel net to have a large number of small gaps.
[0010]
The operation of the exhaust valve of the above embodiment is as follows. First, when water is fed into the pipe, the float 12 is in a valve open state in which the float 12 is separated from the valve seat 6 and lowered. As a result, the air in the pipe flowing into the valve chamber 3 from the inlet 4 flows from the space between the ribs 9 through the upper end of the float receiver 10, through the through hole 11 into the float receiver 10, and further through the small gap 14. Exhaust to outlet 5. Then, when the exhaust is finished and the water in the pipe flows into the valve chamber 3 from the inlet 4, the water flows into the float receiver 10 from the space between the ribs 9 through the upper end of the float receiver 10 and through the through hole 11. As a result, the float 12 rises, sits on the valve seat 6 and closes. This prevents leakage of water.
[0011]
When the pressure in the piping system is reduced to a vacuum state, the float 12 is separated from the valve seat 6 and lowered to open. As a result, the outside air flowing into the valve chamber 3 from the outlet 5 through the small gap 14 passes through the space between the upper end of the float receiver 10 and the rib 9 and from the inside of the float receiver 10 through the through hole 11 to the inlet 4. The vacuum state is broken by introducing it into the pipe. At this time, the external air is decelerated by the flow dividing member 13 and diffused into the valve chamber 3 from the small gaps 14 at a moderate speed, so that it hardly hits the bottom of the float receiver 10 and rebounds. It becomes difficult for the pressure below the float 12 to rise. Therefore, the float 12 is difficult to lift, and the vacuum breaking ability is large and the vacuum breaking can be performed quickly.
[0012]
【The invention's effect】
The present invention produces the following specific effects.
As described above, the exhaust valve according to the present invention is provided with a diversion member having a large number of small gaps at the outlet, and decelerates the external air and diffuses it into the valve chamber at a gradual speed. It produces an excellent effect of being able to break the vacuum.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an exhaust valve according to an embodiment of the present invention.
FIG. 2 is a plan view of the flow dividing member of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 3 Valve chamber 4 Inlet 5 Outlet 6 Valve seat 8 Valve port 9 Rib 10 Float receptacle 11 Through-hole 12 Float 13 Dividing member 14 Small gap

Claims (1)

In the casing, a valve chamber is formed with an inlet opening at the bottom and an outlet opening at the top, a valve seat is formed between the valve chamber and the outlet, and a rib protruding inward is formed on the valve chamber wall. A float receiver with a bottomed almost cylindrical shape with a small opening area at the bottom is fixed inside, and the float is placed in the float receiver in a free state, and has a number of small gaps at the outlet. An exhaust valve comprising a member.

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