JPH02107898A - Float valve - Google Patents

Abstract

PURPOSE:To obtain a large valve opening force without enlarging a casing by arranging the first lever fitted with a valve body opening or closing a valve port at one end nearly in parallel with the displacement direction of a float and arranging the second lever operating the other end of the first lever nearly perpendicularly to the displacement direction of the float. CONSTITUTION:An inlet 6 is connected at the position where condensed water is generated. Condensed water and steam flow into a valve chamber 4, and condensed water is separated and accumulated at the lower section and steam at the upper section. A float 11 is floated as the water level in the valve chamber 4 rises, and the second lever 15 is rotated clockwise. The first lever 12 is rotated counterclockwise by the rotation of the lever 15, and a valve body 14 opens valve port 9. The condensed water in the valve chamber 4 is discharged to an outlet 7 through the valve port 9. When the water level is lowered by the discharge, the float 11 is also lowered, the lever 15 is rotated counterclockwise and the lever 12 is rotated clockwise as the float is lowered, the valve body 14 closes the valve port 9, and the outflow of steam is prevented. These actions are automatically repeated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention utilizes the difference in specific gravity between a gas and a liquid to drive a valve means via a lever with an open or closed float to remove one fluid from a gas-liquid mixing system. This invention relates to the structure of a float valve that automatically discharges water.

The float valve is used to selectively and automatically discharge either gas or liquid from a system in which gas and liquid coexist. Steam traps that automatically discharge condensate generated in steam piping systems, air traps that automatically discharge condensed water generated in compressed air piping systems, and air vents that automatically discharge air mixed in water piping systems. It is a hat.

The gas with lower specific gravity is located above the liquid with higher specific gravity. The liquid level moves up and down according to changes in the ♀♀υj combination of the liquid and gas. A float floats on the liquid surface due to the balance between the buoyancy and force acting on it and its own weight, and moves up and down with the liquid surface. Float valves take advantage of these natural laws, separating gas and liquid in the valve chamber, and placing the valve port at the top or bottom of the valve chamber.
The vertical movement of the float housed in the valve chamber drives the valve means via the lever to open and close the valve port, thereby selectively and automatically discharging one of the fluids.

Conventional technology A conventional float valve, in which a float drives the valve means to open and close the valve port, has a float attached to one end of the lever, the other end of the lever is attached to the valve chamber as a fulcrum, and the valve is placed near the fulcrum.
1 is equipped with a valve body that opens and closes. or,
A float is attached to one end of the lever, a valve body for opening and closing the valve port is attached to the other end of the lever, and the valve body is attached to the valve chamber using a fulcrum near the valve body.

Problems to be Solved by the Present Invention Regarding the above-mentioned problems, in order to increase the discharge capacity 1,
In other words, in order to obtain a large valve opening force jFr, it is necessary to increase the float and its own weight, or to lengthen the lever to increase the magnification ratio of the buoyant force acting on the valve body and its own weight. , there was a problem that the casing became large.

Therefore, the technical problem of the present invention is to provide a valve opening force that can obtain a large valve opening force without damaging the casing.

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problems is to form an inlet, a valve chamber, and an outlet with a valve casing,
A first lever having a valve opening communicating with the valve chamber and the outlet is formed, a float is accommodated in the valve chamber, and a valve body for opening and closing the valve opening is attached to one end, and the first lever is arranged substantially parallel to the displacement direction of the float. A second lever, which operates the other end of the first lever under the action of buoyancy or its own weight, is arranged approximately at right angles to the direction of displacement of the float.

action The operation of the above technical means is as follows.

The float moves up and down with the liquid level in the valve chamber.

The buoyancy or self-weight of the flap floating or descending and displacing in the valve opening direction acts on the second lever, causing it to rotate.

The rotation of the second lever causes the first lever to rotate, and the valve body opens the valve port. The valve-opening force due to the buoyancy of the foot or its own weight is magnified by the first lever, and the magnified valve-opening force is further magnified by the second lever, so that a large valve-opening force can be obtained. ) [1-1- is arranged in the space created by the first lever and the second lever, so there is no need to enlarge the valve chamber and the casing and housing will not become too large.

Effect of the invention The present invention produces the following unique effects.

In order to increase the discharge capacity, install the valve on the side of the return valve or the pilot valve V.
If one side is used, the structure becomes complicated.

In the present invention, since only two levers are arranged, (
14 construction is easy.

Embodiment An embodiment illustrating a specific example of the above technical means will be described (see FIG. 1).

This embodiment is applied to a closed float type steam trap.

A lid 2 is fastened to a main body 1 with bolts (not shown) to form a valve casing having a valve chamber 4 therein.

A gasket 5 is interposed between the main body 1 and the soba 2 to keep them airtight.

An inlet 6 is formed in the upper part of the roof 2, and an exit lower part is formed in the lower part. The inlet 6 communicates with the upper part of the valve chamber 4 and is connected to steam-using equipment (not shown).
etc. to introduce condensate into the valve chamber 4. A valve seat member 8 is screwed to the lower part of the lid 2, the valve chamber 4 and the outlet lower are communicated through a valve port 9 formed in the valve seat member 8, and condensate in the valve chamber 4 is guided to the outlet lower.

The inlet and outlet rollers open horizontally, each forming a female thread for piping.

A hollow spherical float 11 made of a thin stainless steel plate is accommodated in the valve chamber 4 in a free form. The flow 111 floats on the condensate accumulated in the valve chamber 4 and rises and falls with the liquid level.

The first lever 12 is attached to the main body 1 with a pin 13. 1st
The lever 12 can rotate using the bin 13 as a fulcrum. A valve body 14 for opening and closing the valve port 9 is attached to the first lever 12. The first lever 2 extends upward. A second lever 15 is attached to the main body 1 with a pin 16. The second lever 15 is 16
8- Can rotate on a fulcrum. One end of the second lever 15 extends laterally above the float 11. The other end of the second lever 15 is bent so that it can come into contact with the first lever and operate the first lever. A curved portion is formed on the second lever so that the float 11 can be easily held.

The operation of the above steam trap is as follows.

Note that the solid line indicates the valve closed state, and the two-dot chain line indicates the valve open state. The inlet 6 is connected to a point where condensate is generated, such as in steam-using equipment. Condensate and steam flow into the valve chamber 4, where the condensate is separated and accumulated in the lower part and the steam is separated in the upper part. The float 11 rises as the liquid level within the valve chamber 4 rises, causing the second lever 15 to rotate in the clockwise direction. The rotation of the second lever 15 causes the first lever 12 to rotate counterclockwise, causing the valve body 14 to open the valve port 9.

Condensate in the valve chamber 4 is discharged from the valve port 9 to the outlet lower.

When the liquid level drops due to discharge, flows 1 to 11
is lowered, and as the float is lowered, the second lever 15 is
115i! In the one-turn direction, the first lever 12 rotates clockwise, and the valve body 14 closes the valve port 9 to prevent steam from flowing out. This kind of operation is automatically repeated.

In the above embodiment, the float and the second lever are not connected, but of course they may be connected.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a closed float type steam 1: main body 4, valve chamber 7: outlet 11: float 14: valve body trap of an embodiment of the float valve of the present invention. 2: Lid 6: Inlet 9° valve port 12: First lever 15: Second lever

Claims (1)

[Claims] 1. A valve casing that forms an inlet, a valve chamber, and an outlet, a valve port that communicates the valve chamber and the outlet, a float accommodated in the valve chamber, and a valve body that opens and closes the valve port attached to one end. A float valve in which a lever is arranged substantially parallel to the direction of displacement of the float, and a second lever, which operates the other end of the first lever by the buoyancy or self-weight of the float, is arranged substantially at right angles to the direction of displacement of the float.