JPH02102998A - Float valve - Google Patents

Abstract

PURPOSE:To obtain large valve opening force by installing a lever fitted with a valve element for opening and closing a valve opening with an acute-angle gradient with respect to the displacement in the valve opening direction of a float in a valve chest and forming either the lever where the float is pressed or the inner wall surface of the valve chest by material with a low coefficient of friction. CONSTITUTION:Condensate and stem flow in a valve chest 4 and separate from each other, so that the condensate stays in the lower portion thereof and the stem stays in the upper portion. A float 11 rises with rising of the liquid level in the valve chest 4 to be brought into contact with a lever 13 and a guide wall 16. When the liquid level is further raised, the buoyancy of the float 11 is increased, and the float is rotated clock-wise and raised and the guide wall 16 is formed by material with a coefficient of friction lower than that of the lever 13. The buoyancy of the float works on the lever 13 as wedge force, and the lever 13 is rotated in the valve opening direction so that a valve element 15 opens a valve opening 9. When the liquid level is lowered by discharge, the float 11 is rotated counter-clockwise and lowered with discharge and the lever 13 is rotated in the valve closing direction with lowering of the float so that the valve element 15 blocks up the valve opening 9 to prevent outflow of steam.

Description

Detailed Description of the Invention: Industrial Application Field The present invention utilizes the difference in specific gravity between a gas and a liquid to drive a valve means with an open or closed float to automatically drain one fluid from a gas-liquid mixing system. Regarding the construction of a float valve for discharging.

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 compressed air piping systems, air traps that automatically discharge condensed water generated in compressed air piping systems, and air traps that automatically discharge air mixed in water piping systems. Vent etc.

The gas with lower specific gravity is located above the liquid with higher specific gravity. The liquid level moves up and down in response to changes in the quantitative ratio of liquid and gas. The float floats on the liquid surface due to the balance between the buoyant 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. Gas and liquid are separated in a valve chamber, a valve port is placed in the upper or lower part of the valve chamber, and the valve means is activated by the vertical movement of a float housed in the valve chamber. It is driven to open and close the valve port and selectively and automatically discharge one of the fluids.

Conventional technology A conventional float valve uses a float to drive the valve means to open and close the valve port.A float is 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 opening is opened and closed near the fulcrum. It is equipped with a valve body. Alternatively, 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,
In other words, in order to obtain a large valve opening force, the float must be made larger to increase the buoyancy and dead weight, and the lever must be lengthened to increase the expansion ratio of the buoyant force and dead weight acting on the valve body. There was a problem that the size of the image became large.

Therefore, the technical problem of the present invention is to make it possible to obtain a large valve opening force without increasing the size of the float or lengthening the lever.

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 valve port is formed that communicates the valve chamber with the outlet, a float is placed in the valve chamber in a free state, and a lever with a valve body that opens and closes the valve port is tilted at an acute angle with respect to the displacement of the float in the valve opening direction. At least one of the lever that is attached to the valve chamber and the inner wall of the valve chamber that the float comes into contact with is made of a material with a low coefficient of friction.

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

The float, which is placed in a free state within the valve chamber, is displaced up and down along with the liquid level within the valve chamber. The float, which floats or descends and is displaced in the valve opening direction, comes into contact with the lever. Since the lever is inclined at an acute angle with respect to the displacement of the float in the valve opening direction, the buoyancy or own weight of the float is magnified as a force against the lever and moves. Therefore, even if floats of the same size and levers of the same length are used, the valve opening force can be increased.

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

By expanding and utilizing buoyancy or self-weight as a test force, a large valve opening force can be obtained without increasing the size of the float or lengthening the lever, and the casing can be made smaller.

In addition, since either the lever that the float comes into contact with or the inner wall of the valve chamber is made of a material with a low coefficient of friction, sliding frictional resistance acts between the side made of material with a low coefficient of friction and the float. Rolling frictional resistance acts between the side not formed of material with a coefficient of friction and the 70-tooth, and the float can be displaced up and down while rotating. Therefore, the displacement resistance of the float is smaller than that of a float that moves up and down while sliding on the lever and the valve chamber wall, and the float does not get caught between the lever and the valve chamber wall, ensuring reliable operation. Become.

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 lid 2 to keep them airtight.

Form a population of 6 in the upper part of N2, and Form Roa 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, and the valve chamber 4 and the combustion chamber 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 combustion chamber.

The lower part 6 and the lower part are opened in the horizontal direction, and each form a female thread for piping. Airtightness between the valve seat member 8 and the lid 2 is maintained by a gasket 10.

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

2. Attach the lever mounting member 12 with screws (not shown). A lever 13 made of stainless steel is attached to a lever attachment member 12 with a pin 14.

A valve body 15 for opening and closing the valve port 9 is attached to the lever 13.

Therefore, the lever 13 can rotate using the pin 14 as a fulcrum. Ribs are formed on the lever 13 to improve its strength. The upper part of the lever 13 extends diagonally above the float 11 at an angle α from the vertical line.

A guide wall 16 is attached to the side wall (left side in FIG. 1) of the valve chamber 4 with adhesive. The guide wall 16 is made of stainless steel, a nickel-phosphorus alloy coating is formed on its surface by electroless plating, and the nickel-phosphorus alloy coating is impregnated with a fluororesin.

The guide wall 16 is formed in the vertical direction. Reference number 17
are ribs that guide the float 11 in the vertical direction, and are formed at two locations in total, one on the front side of the page, and a slight gap is formed between them and the float 11.

Attach the bimetal 18 to the lid 2 with screws 19.

The bimetal 18 is approximately U-shaped and expands when the temperature is low, exerting a force that pushes up the lever 13 to open the valve, and when the temperature is high, it narrows and changes to a shape that does not engage the lever 13.

The operation of the above steam trap is as follows.

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 and comes into contact with the lever 13 and the guide wall 16. The float 11 becomes more buoyant as the liquid level rises further,
Since the guide wall 16 is made of a material with a lower coefficient of friction than the lever 13 as described above, it rises while rotating clockwise in FIG. 1. The buoyant force of the float acts on the lever 13 as a wedge force, the lever 13 rotates in the valve opening direction (clockwise in FIG. 1), and the valve body 15 opens 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, the float 11 descends while rotating counterclockwise in FIG.
to prevent steam from escaping. This kind of operation is automatically repeated.

The float valve shown in the above embodiment can also be used as an air trap for automatically discharging condensed water from the compressed air piping system, rather than as a steam trap. Moreover, if the arrangement shown in FIG. 1 is turned upside down, it can also be used as an air vent for automatically discharging air from the water piping system.

In the above embodiment, the guide wall was surface-treated, but the guide wall itself can also be made of a material with a low coefficient of friction, such as fluororesin. Further, although the guide wall with a low coefficient of friction is separately attached to the main body, the main body itself may be made of a material with a low coefficient of friction or may be surface-treated. The same applies to levers.

Further, in the above embodiment, the guide wall is formed vertically, but it may be inclined from the vertical direction.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a float type steam trap according to an embodiment of the float valve of the present invention. 1: Main body 2: M 4: Valve chamber 7: Outlet 11: Float 15; Valve body 6: Inlet 9: Valve port 13 Nilever 16: Guide wall

Claims (1)

[Claims] 1. A lever with 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 placed in the valve chamber in a free state, and a valve body that opens and closes the valve port. is attached to the valve chamber at an acute angle with respect to the displacement of the float in the valve opening direction, and either the lever that the float comes into contact with or the inner wall of the valve chamber is formed of a material with a low coefficient of friction.