JP2000329244A - Exhaust valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust valve having large vacuum break ability and quickly performing vacuum break. SOLUTION: A valve chamber 3 having an inflow port 4 in the lower part and an outflow port 5 in the upper part is formed by a casing comprising a main body 1 and a cover 2. A valve seat 6 is formed between valve chamber 3 and the outflow port 5. The main body 1 integrally has a plurality of rids 9 protruded to an inner side in an inner wall of the valve chamber 3, and a bottomed float receiver 10 almost in cylindrical shape having a through hole 11 of small opening area in a bottom part is fixed by a snap ring in an inner side of the rib 9. A spherical float 12 is arranged in a free condition in the float receiver 10. The float receiver 10 has in its side wall many communication holes 13, and a total opening area of the communication holes 13 is formed in a size making the outside air flowing in the float receiver 10 quickly pass through without retention. The outside air flowing in the float receiver 10, passing through the communication hole 13, is made to easily pass through out of the float receiver 10, so at to reduce the air sprung back by colliding against the bottom part of the float receiver 10, and a pressure under the float 12 in the float receiver 10 is difficult to rise. Consequently, the float 12 prevented from easily floating up.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve which is opened when water is supplied to a pipe to exhaust air in the pipe, and when exhaust is completed, the valve is closed. The present invention relates to an exhaust valve for opening a valve when it becomes an exhaust gas to break a vacuum state by introducing external air.

[0002]

2. Description of the Related Art As a conventional exhaust valve, Japanese Utility Model Publication No. 53-16
There is one disclosed in Japanese Patent Publication No. 22. This forms a valve chamber with an inflow opening at the bottom and an outflow opening at the top in the casing, forms a valve seat between the valve chamber and the outflow port, and forms a rib protruding inward on the valve chamber wall. Then, a float receiver having a bottomed substantially cylindrical shape and a through hole having a small opening area at the bottom is fixed inside the rib, and the float is arranged in the float receiver in a free state.

[0003] The above-mentioned conventional exhaust valve is in an open state in which the float separates from the valve seat and descends when water is first introduced into the pipe, and the air in the pipe flowing into the valve chamber from the inflow port is ribbed. From the space between the float receiver upper end and from the through hole through the float receiver to the outlet.
When the water in the pipe flows into the valve chamber from the inflow port after exhaust is completed, the float floats due to the water flowing into the float receiver through the upper end of the float receiver from the space between the ribs and through the through hole. Sit on the seat and close the valve. When the pressure in the piping system is reduced to a vacuum state, the float separates from the valve seat and descends, and external air flowing into the valve chamber from the outlet is passed through the through hole from the float receiver and through the float receiver. Vacuum is broken by introducing into the piping from the inlet through the space between the upper end and the rib.

[0004]

The above-mentioned conventional exhaust valve is
When breaking the vacuum state, the float does not drop enough,
There is a problem that the vacuum breaking capability is small and the vacuum breaking takes a long time because the valve is half-opened or the opening / closing valve is repeated little by little. This is because most of the external air flowing into the valve chamber from the outlet goes straight into the float receiver, hits the bottom of the float receiver, and rebounds, so that the float rises. Also, because the external air that has entered the float receiver cannot pass through the through hole, the pressure below the float in the float receiver increases, and the float rises. Therefore, a technical problem of the present invention is to provide an exhaust valve having a large vacuum breaking capability and capable of quickly breaking a vacuum.

[0005]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is to form a valve chamber in which a casing has an inlet opened at a lower part and an outlet opened at an upper part. A valve seat is formed between the valve chamber and the outlet, a rib protruding inward is formed on the wall of the valve chamber, and a substantially cylindrical bottomed bottom hole having a small opening area is provided inside the rib. The float receiver is fixed, the float is freely arranged in the float receiver, and a communication hole having a large opening area is provided in a side wall of the float receiver.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The exhaust valve according to the present invention is provided with a communication hole having a large opening area on the side wall of the float receiver, so that the external air flowing into the float receiver passes through the communication hole to receive the float. Easy to pass outside. for that reason,
External air is less likely to hit the bottom of the float receiver and rebound, and the pressure below the float in the float receiver is less likely to rise. For this reason, the float is less likely to float, and the vacuum breaking capability is large, so that the vacuum can be broken quickly.

[0007]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). A lid 2 is fastened to the main body 1 with bolts to form a casing having a valve chamber 3 therein. An inflow port 4 is formed in a lower portion of the main body 1, and an outflow port 5 is formed in an upper portion of the lid 2. The mounting member 7 is fixed to the lid 2 with screws with the valve seat 6 interposed therebetween.

The main body 1 integrally has a plurality of ribs 9 protruding inward from the inner wall of the valve chamber 3, and a substantially cylindrical float receiver 10 having a bottom is fixed inside the ribs 9 by a snap ring. The bottom of the float receiver 10 has a through hole 11 having a small passage area communicating between the inside and the outside. The spherical float 12 is placed in the float receiver 10 in a free state.

The float receiver 10 has a large number of communication holes 13 on its side wall. The total opening area of the communication hole 13 is formed large so as to allow the external air flowing into the float receiver 10 to pass through quickly without being stored.

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 separated from the valve seat 6 and is in a valve-opened state. Thereby, the air in the pipe flowing into the valve chamber 3 from the inflow port 4 is transferred from the space between the ribs 9 to the communication hole 13 and the float receiver 10.
The air is exhausted to the outlet 5 through the upper end and from the through hole 11 through the float receiver 10. When the water in the pipe flows into the valve chamber 3 from the inflow port 4 after the exhaust is completed, the rib 9
The water flowing into the float receiver 10 through the communication hole 13 and the upper end of the float receiver 10 from the space between the float receiver 10 and the through hole 11 causes the float 12 to float on the valve seat 6 and close the valve. This prevents leakage of water.

When the pressure in the piping system is reduced to a vacuum state, the float 12 separates from the valve seat 6 and descends to open the valve. Thereby, the external air flowing into the valve chamber 3 from the outlet 5 is passed through the upper end of the float receiver 10, from the inside of the float receiver 10 to the space between the ribs 9 through the communication hole 13, and from the inside of the float receiver 10. The vacuum state is broken by introducing into the pipe from the inflow port 4 through the hole 11. At this time, since the outside air is easily passed out of the float receiver 10 by the communication hole 13 having a large opening area, the outside air is less likely to hit the bottom of the float receiver 10 and bounce off.
2 It is difficult for the pressure below to rise. Therefore, float 1
2 hardly floats up, and has a large vacuum breaking ability, so that vacuum breaking can be performed quickly.

[0012]

The present invention has the following specific effects. As described above, the exhaust valve according to the present invention is provided with a communication hole having a large opening area on the side wall of the float receiver, and facilitates passage of external air flowing into the float receiver from the communication hole to the outside of the float receiver, thereby providing a vacuum. An excellent effect that the breaking ability is large and the vacuum breaking can be performed quickly is produced.

[Brief description of the drawings]

FIG. 1 is a sectional view of an exhaust valve according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 3 Valve room 4 Inflow port 5 Outflow port 6 Valve seat 8 Valve port 9 Rib 10 Float receiver 11 Through hole 12 Float 13 Communication hole

Claims (1)

[Claims] A rib having a casing having an inlet opening at a lower portion and an outlet opening at an upper portion, a valve seat formed between the valve chamber and the outlet, and a rib protruding inward from a wall of the valve chamber. Is formed, and a float receiver having a bottomed substantially cylindrical shape and a through hole having a small opening area at the bottom is fixed inside the rib, and the float is arranged in the float receiver in a free state, and on the side wall of the float receiver. An exhaust valve provided with a communication hole having a large opening area.