JP2007138987A - Exhaust valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust valve without causing water leakage even if water suddenly flows in a valve chest from an inflow port. <P>SOLUTION: A casing having the valve chest 4 is formed inside by fastening a cover 2 to a body 1. The inflow port 6 is formed in a lower part of the body 1, and an outflow port 7 is formed in the cover 2. An installing member 9 is fixed to the cover 2 by sandwiching a valve seat 8 in-between. The body 1 has integrally inwardly projecting four ribs 11 on an inner wall of the valve chest 4, and a bottomed substantially cylindrical float receiver 12 is fixed inside the ribs 11. A spherical float 14 is arranged in the float receiver 12 in a free state. The float receiver 12 has a through-hole 15 communicating the inside and outside in a bottom part, and has six communicating passages 16 communicating the inside and outside on a side wall. The communicating passages 16 are positioned in the substantially same height on the lower end as the center of the float 14 existing in a descending position, and is positioned at the upper end on the upper side of the float 14 existing in the descending position. The upper end of the float receiver 12 is blocked up. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  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.

  A conventional exhaust valve forms a valve chamber with an inlet opening at the bottom and an outlet opening at the top of the casing, forming a valve seat between the valve chamber and the outlet, and projecting inward to the valve chamber wall. A float receiver that has a rib and is formed inside the rib with a bottomed, almost cylindrical shape with a through hole that communicates the inside and outside of the bottom is fixed, and the float is placed in the float receiver in a free state. The upper end of the float receiver is positioned at substantially the same height as the upper end of the float, and a communication path is provided between the upper end of the float receiver and the valve casing above it. This 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 drawn from the space between the ribs. Exhaust to the outlet through the communication path and through the float receiver. When exhaust is finished and the 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 communication passage and through the through hole. Sit down and close. Also, when the pressure in the piping system decreases and the vacuum state is reached, 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 communication passage. The vacuum state is broken by introducing into the pipe from the inlet through the space between the ribs.

The conventional exhaust valve has a problem that when water suddenly flows into the valve chamber from the inlet, the float floats late and leaks from the outlet. This is because, when water suddenly flows in, a part of the air that has passed through the communication path collides with the upper wall of the valve chamber and rebounds to bias the float downward.
Japanese Utility Model Publication No. 51-54263

  Therefore, the technical problem of the present invention is to provide an exhaust valve that does not cause water leakage even when water suddenly flows into the valve chamber from the inlet.

  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 valve seat is formed, a rib projecting inward is formed on the inner wall of the valve chamber, and a float receiver with a bottomed, almost cylindrical shape with a through hole communicating with the inside and outside is fixed inside the rib. The float is arranged in a free state, a communication passage communicating the inside and the outside is formed on the side wall of the float receiver, and the lower end of the communication passage is formed at substantially the same height as the center of the float in the lowered position It is.

  In the present invention, a communication passage that communicates the inside and the outside is formed on the side wall of the float receiver, and the lower end of the communication passage is formed at substantially the same height as the center of the float at the lowered position so that water can flow from the inlet to the valve chamber. Even if it suddenly flows in, the force that biases the float downward can be weakened, so that an excellent effect of preventing water leakage is produced.

  In the present invention, a communication path that communicates the inside and the outside is formed on the side wall of the float receiver, and the lower end of the communication path is formed at substantially the same height as the center of the float at the lowered position. A part of the water flowing into the float receiver through the communication passage can be introduced into the float receiver from a lower position. Therefore, even when water suddenly flows into the valve chamber from the inlet, the amount of water that collides with the upper wall of the valve chamber and rebounds and biases the float downward can be reduced. Therefore, the force for urging the float downward can be weakened, and water leakage does not occur.

  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 a bolt 3 to form a casing having a valve chamber 4 therein, and an outflow pipe 5 is screwed to the lid 2. An inflow port 6 is formed in the lower part of the main body 1, and an outflow port 7 is formed in the lid 2. An annular mounting member 9 is fixed to the lid 2 with four screws 10 with a valve seat 8 interposed therebetween. The main body 1 integrally has four ribs 11 projecting inwardly on the inner wall of the valve chamber 4, and a bottomed substantially cylindrical float receiver 12 is sandwiched between the rib 11 stepped portion and the lid 2. Secure with. A spherical float 14 is disposed in the float receiver 12 in a free state.

  The float receiver 12 has a through hole 15 communicating with the inside and the outside at the bottom, and six communication passages 16 communicating with the inside and outside on the side wall. The lower end of the communication path 16 is substantially the same height as the center of the float 14 in the lowered position and is located slightly above the center of the float 14, and the upper end is located on the upper side of the float 14 in the lowered position. The float receiver 12 is closed by contacting the upper end with the lower surface of the lid 2.

  The operation of the exhaust valve of the above embodiment is as follows. First, when water is fed into the pipe, the float 14 is separated from the valve seat 8 and is lowered to rest on the bottom wall of the float receiver 12. As a result, air in the pipe flowing into the valve chamber 4 is exhausted from the space between the ribs 11 through the communication passage 16 and through the through hole 15 from the float receiver 12 to the outlet 7. Then, when the exhaust is finished and the water in the pipe flows into the valve chamber 4 from the inlet 6, the water flowing into the float receiver 12 from the space between the ribs 11 through the communication path 16 and through the through hole 15. The float 14 rises, sits on the valve seat 8 and closes. This prevents water leakage.

  Even if the water in the pipe suddenly flows into the valve chamber 4 from the inlet 6, the water flowing into the float receiver 12 through the communication path 16 from the space between the ribs 11 flows into the float receiver 12 from a lower position. . Therefore, the amount of water that collides with the upper wall of the valve chamber 4 and rebounds and urges the float 14 downward is reduced, and the force that urges the float 14 downward can be weakened, so water leakage does not occur. When the pressure in the piping system is reduced to a vacuum state, the float 14 moves away from the valve seat 8 and descends to be in a valve opening state on the bottom wall of the float receiver 12. Thereby, the external air flowing into the valve chamber 4 is introduced into the pipe from the inlet 6 through the space between the communication passage 16 and the rib 11 and from the float receiver 12 through the through hole 13 into the pipe. Destroy.

Sectional drawing of the exhaust valve of the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 4 Valve chamber 5 Outflow pipe 6 Inlet 7 Outlet 8 Valve seat 9 Mounting member 11 Rib 12 Float receptacle 14 Float 15 Through-hole 16 Communication path

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 through hole that communicates the inside and outside of the bottom is fixed, the float is placed in the float receiver in a free state, and the communication passage communicates the inside and outside with the side wall of the float receiver. An exhaust valve characterized in that the lower end of the communication passage is formed at substantially the same height as the center of the float in the lowered position.

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