JP2000320720A - Air exhaust valve - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide an exhaust valve having a large vacuum breaking ability and capable of quickly breaking a vacuum. SOLUTION: A valve chamber 3 is formed by a casing comprising a main body 1 and a lid 2 and has an inflow port 4 opened at a lower portion and an outflow port 5 opened at an upper portion. A valve seat 6 is formed between the valve chamber 3 and the outlet 5.
The main body 1 integrally has a plurality of ribs 9 protruding inward on the inner wall of the valve chamber 3 and snaps a float receiver 10 having a bottomed substantially cylindrical shape inside the ribs 9 and a through hole 11 having a small opening area at the bottom. Secure with a ring. The spherical float 12 is arranged in the float receiver 10 in a free state. The lid 2 integrally has a barrier member 13 via a plurality of ribs 14 on the inner wall of the outlet 5. The barrier member 13 is located substantially at the center of the outlet 5. The outside air is prevented by the barrier member 13 from going straight to the center of the valve chamber, and is decelerated and flows into the valve chamber 3 at a gentle speed. The pressure below the float 12 hardly rises. As a result, the float 12 is hardly lifted, and has a large vacuum breaking capability, so that the vacuum can be broken quickly.

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 opening at a lower portion and an outlet opening at an upper portion. Forming a valve seat between the valve chamber and the outlet, forming a rib protruding inward on the wall of the valve chamber, 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 receiver is fixed, the float is freely arranged in the float receiver, and a barrier member is provided at a substantially central portion of the outlet.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The exhaust valve of the present invention is provided with a barrier member substantially at the center of the outlet, so that the outside air is prevented from going straight to the center of the valve chamber by the barrier member. The air is decelerated by the barrier member and flows into the valve chamber at a slow speed. Therefore, the outside 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 increase. 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 small opening area through hole 11 communicating the inside and outside. The spherical float 12 is placed in the float receiver 10 in a free state.

The lid 2 integrally has a barrier member 13 on the inner wall of the outlet 5 via a plurality of ribs 14. The barrier member 13 is located substantially at the center of the outlet 5.

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 passed from the space between the ribs 9 through the upper end of the float receiver 10, from the through hole 11 to the inside of the float receiver 10, and further between the ribs 14. The air is exhausted to the outlet 5 through the space. Then, when the water in the pipe flows into the valve chamber 3 from the inflow port 4 after the evacuation is completed, the float receiver 10 is removed from the space between the ribs 9.
The float 12 floats by the water flowing into the float receiver 10 through the upper end and through the through hole 11 to seat 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 through the space between the ribs 14 is passed 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. The vacuum state is broken by introducing into the pipe from the inflow port 4. At this time,
The outside air is hindered by the barrier member 13 from going straight to the center of the valve chamber, and is decelerated and flows into the valve chamber 3 at a gentle speed. Float 12
The lower pressure is less likely to rise. Therefore, float 12
Is difficult to float, and the vacuum breaking ability is large, so that the vacuum can be broken quickly.

[0012]

The present invention has the following specific effects. As described above, in the exhaust valve according to the present invention, the barrier member is provided at a substantially central portion of the outflow port to prevent the external air from going straight to the central portion of the valve chamber and reduce the external air to flow into the valve chamber at a gentle speed. By doing so, there is an excellent effect that the vacuum breaking capability is large and the vacuum breaking can be performed quickly.

[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 Barrier member 14 Rib

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. A float receiver having a substantially cylindrical shape with a bottom inside the rib and a through hole having a small opening area at the bottom is fixed, and the float is arranged in the float receiver in a free state. An exhaust valve characterized in that a barrier member is provided in a portion.