JP2002181216A - Exhaust valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust valve of high vacuum breaking ability capable of carrying out vacuum break quickly. SOLUTION: A valve chest 3 is fromed of a casing comprising a main body 1 and a lid 2 to open an inflow port 4 in its lower part and to open an outflow port 5 in its upper part. The main body 1 has integrally plural ribs 9 protruded inwards in an inner wall of the valve chest 3 to fix a substantially cylindrical bottomed float receiver 10 having a through-hole 11 of a small opening area in its bottom part inside the ribs 9. A spherical float 12 is arranged inside the float receiver 10 in a free condition. A displacement member 13 is mounted on the float 12. The member 13 has a ring-like shape having the center hole through which an upper part of the float 12 seated and separated onto/from the valve chest is protruded, the outside air is difficult to flow into the float receiver 10 located in a lower side of the float 12 by the displacement member 13, and pressure is thereby difficult to increase in the lower side of the float 12 inside the float receiver 10. Therefore the float 12 is difficult to foat up to be enhanced in the vacuum breaking ability and to allow the vacuum breake 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 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 freely arranged in the float receiver.

[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. Between the space and the upper end of the float receiver and from the through hole to the outlet through the float receiver.
When the water in the pipe flows into the valve chamber from the inflow port after the exhaust is finished, 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. The vacuum is broken by introducing into the piping from the inflow port 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. Accordingly, a technical object 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 is fixed to the float receiver, the float is placed in the float receiver in a free state, and the float has a central hole from which the upper part of the float that projects to and from the valve seat protrudes, and the displacement member that slides on the inner peripheral surface of the float receiver is attached to the float. It is characterized by being placed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An exhaust valve according to the present invention has a float having a center hole from which an upper portion of a float protruding and detaching from a valve seat projects and which is in sliding contact with an inner peripheral surface of a float receiver. Therefore, it becomes difficult for the external air to flow into the float receiver below the float by the displacement member. 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 inside. 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 displacement member 13 is placed on the float 12. The displacement member 13 has a ring shape having a central hole from which the upper part of the float 12 protrudes and detaches from the valve seat, the outer diameter is slightly smaller than the inner diameter of the float receiver, and the outer peripheral edge is the float receiver 1.
0 is in sliding contact with the inner peripheral surface.

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-open state in which it is lowered. Thereby, the air in the pipe flowing into the valve chamber 3 from the inlet 4 is exhausted from the space between the ribs 9 to the outlet 5 through the upper end of the float receiver 10. In addition, float receiver 1
The air flowing into the space 0 is exhausted to the outlet 5 through a space between the float 12 and the displacement member 13 which is displaced upward by the flow of the air. 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 from the space between the float receiver 10 through the upper end of the float receiver 10 and through the through hole 11 causes the float 12 to float, 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. As the float 12 descends, the displacement member 13 also descends. Thus, the external air flowing into the valve chamber 3 is introduced into the piping from the inflow port 4 through the space between the upper end of the float receiver 10 and the rib 9 to break the vacuum state. At this time, since the external air is unlikely to flow into the float receiver 10 below the float 12 by the displacement member 13, the external air is less likely to hit the bottom of the float receiver 10 and bounce off, and the pressure inside the float receiver 10 below the float 12 is hard to increase. Become. As a result, the float 12 is hardly lifted, and has a large vacuum breaking capability, so that the vacuum can be broken quickly.

[0012]

The present invention has the following specific effects. As described above, the exhaust valve according to the present invention has a center hole from which the upper part of the float that is detached and seated on the valve seat has a central hole protruding, and the displacement member that slides on the inner peripheral surface of the float receiver is placed on the float, and external air is displaced by the displacement member. By making it difficult to flow into the float receiver below the float, an excellent effect that the vacuum 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 Displacement member

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 bottomed bottom and a through hole having a small opening area at the bottom is fixed inside the rib, the float is arranged in the float receiver in a free state, and the seat is separated from the valve seat. An exhaust valve having a central hole from which an upper portion of a float to be protruded has a displacement member which slides on an inner peripheral surface of a float receiver and is mounted on the float.