JP2003090450A - Exhaust valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust valve capable of closing after completion of exhaust even if flow-in port side pressure in high. SOLUTION: A valve chest 3 is formed with a casing composed of a main body 1 and a cover 2 having a flow-in port 4 at a lower part thereof and a flow-out port 5 at an upper part thereof. A valve seat 6 is formed between the valve chest 3 and the flow-out port 5. The main body 1 includes plural ribs 9 projecting inward on an inner wall of the valve chest 3 as one body and has a bottomed and roughly cylindrical float receiver 10 having an externally threaded position adjustment member 13 projecting downward from the bottom part as one body and having a through hole 11 in the bottom part arranged inside of the ribs 9. A spherical float 12 is arranged inside of the float receiver 10 under a free condition. The position adjustment member 13 of the float receiver 10 is threadedly engaged with an attachment member 18 formed on an inner wall of the flow-in port 4 of the main body 1 as one body and is locked with a lock nut 14. If flow-in port 4 side pressure in high, position of the float receiver 10 is adjusted to a lower position and if flow-in port 4 side pressure is low, position of the float receiver 10 is adjusted to a higher position.

Description

Description: 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 and the pipe is closed. The present invention relates to an exhaust valve that opens when a system pressure is reduced to be in a vacuum state and introduces external air to break the vacuum state. 2. Description of the Related Art As a conventional exhaust valve, Japanese Utility Model Publication No. Sho 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 a float separates from a valve seat and descends when water is first fed into a pipe, and air in the pipe flowing into the valve chamber from an inflow port is ribbed. Between the space through the float receiver upper end and from the through hole through the float receiver to the outlet.
When the water in the piping flows into the valve chamber from the inflow port after the exhaust is finished, the float floats up 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 from the float receiver through the through hole 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
If the pressure on the inlet side is high, there is a problem that the float sits on the valve seat and closes even though the exhaust has not been completed yet. This is because when the pressure on the inlet side is high, the air passes at high speed between the float and the valve seat, so the static pressure drop between the float and the valve seat increases, and the exhaust has not yet been completed. Nevertheless, the float is attracted to the valve seat and the seat closes. Therefore, a technical problem of the present invention is to provide an exhaust valve that can be closed after exhaust is completed even if the pressure on the inlet side is high. Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is a valve chamber having a casing with an inlet opening at a lower portion and an outlet at an upper portion. , A valve seat is formed between the valve chamber and the outlet, a rib protruding inward on the wall of the valve chamber, and a substantially cylindrical bottomed bottom with a through hole at the bottom inside the rib. A receiver is provided, the float is freely disposed in the float receiver, and a position adjusting member for adjusting the position of the float receiver up and down is provided. According to the technical means of the present invention, when the pressure on the inlet side is high, the float and the valve seat are adjusted by adjusting the position of the float receiver downward. Therefore, it is possible to prevent the float from being attracted to the valve seat and closing the seat even when the exhaust has not been completed yet. When the pressure on the inlet side is low, the distance between the float and the valve seat can be reduced by adjusting the position of the float receiver upward, so that a delay in closing the valve after exhaust is completed can be prevented. . 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 on the inner wall of the valve chamber 3. Inside the ribs 9, a position adjusting member 13 having a substantially cylindrical shape with a bottom and a male screw shape downward from the bottom.
The float receiver 10 protrudes integrally. The float receiver 10 has a through hole 11 at the bottom thereof for communication between inside and outside. The spherical float 12 is placed in the float receiver 10 in a free state. The main body 1 has a plurality of ribs 17 on the inner wall of the inflow port 4.
And a mounting member 18 interposed therebetween. The position adjusting member 13 of the float receiver 10 is screw-coupled to the mounting member 18, and is locked by the lock nut 14. The position adjusting member 13 has a notch 15 at the lower end of which a tool such as a screwdriver fits. To adjust the position of the float receiver 10 up and down, the lock nut 14 is loosened, the position adjusting member 13 is rotated with a tool such as a screwdriver, and the lock nut 14 is again locked. The operation of the exhaust valve of the above embodiment is as follows. First, when water is supplied to the pipe, the float 12 is separated from the valve seat 6 and descends, and is in a valve-open state on the bottom wall of the float receiver 10. As a result, the air in the pipe flowing into the valve chamber 3 is exhausted from the space between the ribs 9 through the upper end of the float receiver 10 and from the through hole 11 to the outlet 5 through the inside of the float receiver 10. When the water in the pipe flows into the valve chamber 3 from the inflow port 4 after the evacuation, the water flowing 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 floats, sits on the valve seat 6, and closes.
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 be in an open state mounted on the bottom wall of the float receiver 10. Thereby, the external air flowing into the valve chamber 3 is introduced into the pipe from the inlet 4 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. Destroy. When the pressure on the inlet 4 side is high, the position of the float receiver 10 is adjusted downward,
By lowering the position of the float 12 on the bottom wall of
Since the space between the float 12 and the valve seat 6 can be increased, it is possible to prevent the float 12 from being sucked by the valve seat 6 and closing the seat even though the evacuation has not been completed yet. When the pressure at the inflow port 4 side is low, the position of the float receiver 10 is adjusted upward to raise the position of the float 12 resting on the bottom wall of the float receiver 10, so that the space between the float 12 and the valve seat 6 is increased. Since it can be made smaller, it is possible to prevent a delay in closing the valve after the exhaust is completed. The present invention has the following specific effects. As described above, the exhaust valve according to the present invention is provided with the position adjusting member for adjusting the position of the float receiver up and down, so that when the pressure on the inlet side is high, the position of the float receiver is lowered. By adjusting and increasing the space between the float and the valve seat, it is possible to prevent the float from being sucked into the valve seat and closing the seat even if exhaust has not been completed yet, and the inlet side When the pressure is low, by adjusting the position of the float receiver upward to reduce the space between the float and the valve seat, an excellent effect of preventing a valve closing delay after exhaust is completed can be obtained.

[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] 1 body 2 lid 3 Valve room 4 Inlet 5 Outlet 6 Valve seat 9 ribs 10 Float tray 11 through hole 12 float 13 Position adjustment member 14 Lock nut 18 Mounting member

Claims (1)

Claims: 1. A valve chamber having an inlet opening at a lower portion and an outlet opening at an upper portion of a casing, a valve seat formed between the valve chamber and the outlet, and a valve chamber inner wall. Form a rib that protrudes inward on the inside, arrange a float receiver with a bottom in a substantially cylindrical shape with a through hole at the bottom inside the rib, arrange the float in the float receiver in a free state, and position the float receiver An exhaust valve provided with a position adjusting member for adjusting the height of the exhaust valve.