JP2014214850A - Float type check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a float type check valve having high drainage capacity and capable of surely preventing backflow of water.SOLUTION: A float type check valve 1 to be arranged in a drainage system includes: an annular valve seat 6 communicated from an upstream port 11; a float 9 arranged under the annular valve seat 6, allowed to float due to rise of a water level to close the annular valve seat 6 and allowed to descend due to lowering of the water level to open the annular valve seat 6; a plurality of guide rods 7 located on the side of the float 9 to vertically guide the float 9; a bottom plate 8 located under the float 9 to define a descending position of the float 9; a through-hole 18 vertically penetrating the bottom plate 8; and a downstream port 19 for connecting side portions of the guide rods to a downward portion of the bottom plate.

Description

The present invention is a float type anti-reflux valve which is disposed in a drainage system and allows a forward flow of liquid from an upstream port to a downstream port, but prevents the reverse flow, that is, the flow from the downstream port to the upstream port. About.

A conventional float type check valve is disclosed in Patent Document 1, for example. This is a float type backflow prevention valve disposed in the drainage system, and is connected to the annular valve seat communicating from the upstream port, and is floated by rising the water level and closed by closing the annular valve seat. A float that lowers due to a drop in water level and opens the annular valve seat, a plurality of guide rods that are located laterally of the float and guide the float vertically, and a float that is located below the float And a bottom plate that defines a lowered position.

Japanese Utility Model Publication No. 6-67588

The above-mentioned conventional float type check valve is normally in a state where the float opens the annular valve seat and descends and rests on the bottom plate, and the drainage of the upstream port passes downstream from the annular valve seat between each guide rod. It flows into the drainage basin. On the other hand, when water flows backward from the downstream side, the float rises and the annular valve seat closes due to the rise in the water level that flows back around the float through the guide rods, preventing backflow to the upstream port. To do. However, in this float type check valve, since the lateral side of the float and the downstream drainage basin communicate with each other only between the guide rods, the ability to flow the drainage downstream from the annular valve seat is sufficient. In addition, the float floats late and water may leak out to the upstream port during reverse flow.

The problem to be solved is to provide a float type backflow prevention valve that has a high drainage capacity and can reliably prevent backflow of water.

In order to solve the above problems, a float type check valve of the present invention is a float type check valve disposed in a drainage system, and includes an annular valve seat communicating from an upstream port, A float which is disposed below and floats when the water level rises, closes the annular valve seat and descends when the water level lowers to open the annular valve seat, and a plurality of floats which are located laterally of the float and which guide the float vertically A guide plate, a bottom plate that is positioned below the float and defines a lowering position of the float, a through hole that vertically penetrates the bottom plate, and a downstream port that communicates laterally with the guide rod and below the bottom plate. And comprising.

In the present invention, in a normal state, the float opens the annular valve seat and descends and is placed on the bottom plate, and the drainage of the upstream port passes from the annular valve seat to the downstream port through each guide rod and through the through hole of the bottom plate. Since it flows, it has an excellent effect of high drainage capacity. When the water flows backward from the downstream side, the float rises and closes the annular valve seat due to the rise of the water level that flows back to the periphery of the float through the hole in the bottom plate and between the guide rods. An excellent effect is brought about in that the water can flow up early and the backflow of water can be reliably prevented.

It is sectional drawing of the float type backflow prevention valve concerning embodiment of this invention. It is a bottom view of the main body of FIG. It is a top view of the baseplate of FIG. It is sectional drawing of the float type backflow prevention valve concerning another embodiment of this invention. It is sectional drawing of the float type backflow prevention valve concerning another embodiment of this invention. It is sectional drawing of the float type backflow prevention valve concerning another embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3. 1 is a sectional view of a float type check valve according to an embodiment of the present invention, FIG. 2 is a bottom view of the main body of FIG. 1, and FIG. 3 is a plan view of the bottom plate of FIG. The float type check valve 1 of this embodiment is disposed in a drain pipe 3 of a drainage system provided on a floor surface 2 and is attached to the floor surface 2 by welding 4. The float type check valve 1 includes a main body 5, an annular valve seat 6 and a guide rod 7 attached to the main body 5, a bottom plate 8 attached to the guide rod 7, an annular valve seat 6, the guide rod 7 and the bottom plate 8. And a spherical float 9 disposed inward.

A fixture 10 is attached to the main body 5 by screw connection, and the fixture 10 is attached to the floor 2 by welding 4. In the main body 5, the upstream opening 11 penetrates up and down, and the annular valve seat 6 is attached to the lower end of the main body 5 via the valve seat presser 14 by a small screw 13 screwed to the lower screw hole 12. The annular valve seat 6 communicates from the lower end of the upstream port 11. The main body 5 has a guide rod 7 screwed to a lower screw hole 15, and a bottom plate 9 having a guide rod hole 16 is inserted into the lower portion of the guide rod 7 and attached by a nut 17. Four guide rods 7 are provided at equal intervals and are positioned laterally of the float 9 to guide the float 9 in the vertical direction. At least three guide rods 7 can be formed.

The float 9 can be made of a synthetic resin or a synthetic rubber, or can be made of a hollow metal such as stainless steel. The float 9 floats when the water level rises and closes the annular valve seat 6, and descends when the water level falls and the annular valve seat 6. Open. The bottom plate 8 is positioned below the float 9 to determine the lowering position of the float 9 and has a normally open through-hole 18 penetrating vertically. The downstream port 19 communicates from the side of the guide bar 7 and from below the bottom plate 8.

In a normal state, the float 9 opens the annular valve seat 6 and is placed on the bottom plate 8, and the drainage of the upstream port 11 flows between the annular valve seat 6 and the guide rods 7 and through holes 18 in the bottom plate 8. Flows to the downstream port 19 side. Thereby, it can drain quickly. At the time of reverse flow of water from the downstream side, the float 9 rises rapidly due to the rise of the water level that flows back around the float 9 through the through hole 18 of the bottom plate 8 and the guide rods 7, and the annular valve seat 6. Close. Thereby, the backflow of water can be prevented reliably.

Another embodiment of the present invention will be described with reference to FIGS. 4 to 6 are sectional views of a float type check valve according to another embodiment of the present invention. In FIG. 4, the float type check valve 1 has a male screw 5 a provided on the main body 5 attached to a female screw 3 a provided on the drain pipe 3 by screw connection. Thereby, the float type check valve 1 can be easily and reliably attached to the female screw 3 a of the drain pipe 3. An upstream drain pipe (not shown) is connected to the upper end of the main body 5. In FIG. 5, the float type check valve 1 is attached to a main body 5 by screw coupling, and a female screw 10 a provided on the fitting 10 is attached to a male screw 3 b provided on the drain pipe 3 by screw coupling. Thereby, the float type check valve 1 can be easily and reliably attached to the male screw 3 b of the drain pipe 3. An upstream drain pipe (not shown) is connected to the upper end of the fixture 10. In FIG. 6, the float type check valve 1 has a flange 5 b provided on the main body 5 attached to a flange 3 c provided on the drain pipe 3 with a bolt 20. Thereby, the float type check valve 1 can be easily and reliably attached to the flange 3 c of the drain pipe 3. An upstream drain pipe (not shown) is connected to the flange 5b.

  The present invention is arranged in a drainage system to allow the flow of liquid in the forward direction from the upstream port to the downstream port, but to prevent the reverse flow, that is, the flow from the downstream port to the upstream port. Can be used for valves.

DESCRIPTION OF SYMBOLS 1 Float type backflow prevention valve 2 Floor surface 3 Drain pipe 5 Main body 6 Annular valve seat 7 Guide rod 8 Bottom plate 9 Float 11 Upstream port 18 Through hole 19 Downstream port

Claims (1)

A float type check valve installed in the drainage system,
An annular valve seat communicating from the upstream port;
A float which is arranged below the annular valve seat and floats by rising the water level, closes the annular valve seat and lowers by lowering the water level to open the annular valve seat;
A plurality of guide rods positioned laterally of the float to guide the float in a vertical direction, a bottom plate positioned below the float and defining a lowering position of the float;
A through-hole penetrating the bottom plate vertically,
A downstream port communicating with the side of the guide rod and the bottom of the bottom plate;
Float type check valve.

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