JPH0623804Y2 - Exhaust valve - Google Patents

Description

[Detailed Description of the Invention] Industrial application The present invention relates to an exhaust valve that is attached to a water pipe such as cold water or hot water to exhaust gas in the pipe, and in particular, the liquid is ejected to the outside of the valve immediately before the end of exhaust. Regarding things to prevent.

At the beginning of liquid transportation, smooth liquid transportation cannot be performed unless the air in the pipe is removed, and gas such as air constantly accumulates in the liquid transportation pipe, and this gas does not stay quickly and Must be excluded outside the plumbing.

2. Description of the Related Art As an exhaust valve that expels gas in a pipe quickly and without accumulating, there is, for example, the one disclosed in Japanese Utility Model Publication No. 57-12310. It forms a valve chamber with a valve casing, forms an inlet in the lower part of the valve chamber, forms a valve port leading to the outlet in the upper part, and arranges a float for opening and closing the valve port in the valve chamber in a free state via a protective bucket. As the float moves up and down depending on the water level in the valve chamber, the valve port is opened and closed to remove only the gas outside the valve and prevent the liquid from flowing out of the valve.

However, the above-mentioned problem has a problem that the liquid flows out from the valve opening to the outside of the valve immediately before the exhaust is finished, that is, immediately before the float closes the valve opening. This is because the fluid is a mixed fluid of gas and liquid immediately before the end of exhaust, and the flow velocity is high because it passes through a relatively narrow passage between the valve casing and the protective bucket, and immediately before closing the gas. At the same time, the liquid also flows out of the valve.

The liquid that has leaked out of the valve must be prevented as much as possible in order to deteriorate the environment around the valve and increase the risk of secondary disaster due to water leakage.

Therefore, the technical problem of the present invention is to obtain an exhaust valve that does not cause the liquid to flow out of the valve even if it is a gas-liquid mixed fluid immediately before the valve is closed and does not deteriorate the environment around the valve. is there.

Means for Solving the Problems A valve chamber is formed inside with a valve casing, an inlet is formed in the lower part of the valve chamber, a valve port leading to the outlet is formed in the upper part, and a float is freely set in the valve chamber through a protective bucket. In the arrangement, a guide member is provided between the protection bucket and the valve opening, below the valve opening, to convert the flow direction of the fluid passing through the gap between the valve casing and the protection bucket to the lower center of the valve chamber. .

Action Immediately before the end of exhaust, the fluid in the valve chamber becomes a gas-liquid mixed fluid. Most of the inflowing mixed fluid reaches the valve opening through the gap between the inner wall of the valve casing and the protective bucket, but a guide member that converts the flow direction between the protective bucket and the valve opening to the lower center of the valve chamber. By providing, the flow direction of the mixed fluid is once converted to the lower part of the center of the valve chamber before reaching the valve opening, and then converted to the upper part again to the valve opening. A liquid with a large mass in the mixed fluid that has flowed downward drops again in the lower part of the valve chamber due to its own weight and a downward inertial force at a location where the flow velocity at which the direction changes again is very small, The direction is changed upward, and the gas is discharged from the valve port to the outlet.

The dropped water droplet does not reach the valve opening again because the flow velocity of the fluid in the lower center of the valve chamber is slow.

Effect of the Invention Even if the gas-liquid mixed fluid flows into the valve chamber, the liquid does not drain from the valve opening by dropping to the lower portion of the valve chamber, and the environment around the valve is not deteriorated.

Example An example showing a specific example of the above technical means will be described (see FIGS. 1 and 2).

The outlet member 2 is airtightly coupled to the upper end opening of the substantially cylindrical body 1 via the gasket 4 with the cap nut 3. Body 1
The lower end opening of forms an inlet 5 and connects to the piping system. The valve chamber 6 above the inlet 5 has a substantially cylindrical shape, and a plurality of ribs 7 project from the inner wall. The protective bucket 8 is attached so as to contact the inner circumference of the rib 7. The protection bucket 8 has a substantially cylindrical shape, and has a plurality of through holes 10 in the bottomed portion at the lower end. The guide member 20 is attached to the upper portion of the protection bucket 8. Guide member 2
Reference numeral 0 has a substantially circular cross section, has a penetrating portion 21 for allowing a fluid to pass therethrough, fixes the protective bucket 8 at the lower end flange portion 22, and also attaches the guide member 20 to the main body 1.

The spherical float 11 is housed in the protection bucket 8. The valve seat member 12 is screwed to the upper end of the valve chamber 6 via the gasket 13. A valve seat 16 made of synthetic rubber is attached to the end of the valve seat member 12 on the valve chamber 6 side. A valve port 15 is provided in the center of the valve seat 16 and the valve seat member 12 to communicate with the outlet 14.

When the liquid flows into the valve chamber 6 from the inlet 5, the liquid reaches the inside of the protective bucket 8 through the through hole 10 at the bottom of the protective bucket 8, floats the float 11 and abuts the valve seat 16 to contact the valve opening. 15 is closed to prevent the liquid from flowing out of the valve. When the gas flows in, the buoyancy of the float 11 disappears, and the float 11 separates from the valve seat 16 and discharges the gas out of the valve. Immediately before the end of the gas discharge, the mixed fluid of the gas and the liquid flows through the through hole 10 and the protection bucket 8.
Through the gap 19 between the main body 1 and the valve body 6, the valve chamber 6 is reached. In this case, the fluid that has reached the valve chamber 6 through the through hole 10 hardly reaches the valve seat 16 portion due to the float 11, but the fluid that has passed through the gap 19 increases the flow velocity because the passage area is reduced. Head toward the valve seat 16. The fluid flowing from the gap 19 to the valve seat 16 via the penetrating portion 21 is converted by the guide member 20 into a flow direction below the center of the valve chamber. Then, the liquid having a large mass is dropped onto the upper part of the float 11 by its own weight and inertial force due to the decrease in the flow velocity at the portion where the flow direction is changed upward again. Further, the gas is discharged from the valve opening 15 of the valve seat 16 through the outlet 14 to the outside of the valve while the direction is changed again.

As described above, even if the gas-liquid mixed fluid flows into the valve chamber 6, the liquid does not flow out of the valve by the guide member 20, and the environment around the valve is not deteriorated.

[Brief description of drawings]

FIG. 1 is a sectional view of an exhaust valve of an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA in FIG. 1: body, 2: outlet member, 5: inlet, 6: valve chamber, 7: rib, 8: protective bucket, 11: float, 14: outlet,
15: valve opening, 16: valve seat, 19: gap, 20: guide member

Claims (1)

[Scope of utility model registration request] 1. A valve casing is formed in the valve casing, an inlet is formed in a lower portion of the valve chamber, a valve opening is formed in an upper portion of the valve chamber, and a float is arranged in a free state in the valve chamber through a protective bucket. In the exhaust valve, a guide member is provided between the protective bucket and the valve opening, below the valve opening, and a guide member that converts the flow direction of the fluid passing through the gap between the valve casing and the protective bucket into the lower center of the valve chamber.