JPH0697079B2 - Float valve - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention utilizes the difference in specific gravity between gas and liquid to drive valve means via a lever with an open or closed float, thereby allowing one fluid to flow from a gas-liquid mixing system. It relates to the structure of a float valve that automatically discharges.

The float valve is used when either gas or liquid is selectively and automatically discharged from a system in which gas and liquid are mixed. A steam trap that automatically discharges condensate generated in the steam piping system, an air trap that automatically discharges condensed water generated in the compressed air piping system, and an air vent that automatically discharges air mixed in the water piping system. Etc.

A gas having a small specific gravity is located above a liquid having a large specific gravity. The liquid surface moves up and down according to the change in the quantitative ratio of liquid and gas. The float floats on the liquid surface by the balance between the buoyancy acting on it and its own weight, and moves up and down together with the liquid surface. The float valve uses these natural laws, it separates gas and liquid in the valve chamber, and arranges the valve opening in the upper or lower part of the valve chamber,
The vertical movement of the float accommodated in the valve chamber drives the valve means through the lever to open and close the valve port, and selectively and automatically discharge one fluid.

A conventional float valve, which opens and closes the valve opening by driving the valve means with a float, attaches the float to one end of the lever, attaches it to the valve chamber with the other end of the lever as a fulcrum, and opens and closes the valve opening near the fulcrum. The valve body is attached. Alternatively, the float is attached to one end of the lever, the valve body for opening and closing the valve opening is attached to the other end of the lever, and the valve body is attached to the valve chamber with the vicinity of the valve body as a fulcrum.

Problems to be Solved by the Present Invention In the above, in order to increase the discharge capacity,
That is, in order to obtain a large valve opening, the float must be increased to increase the buoyancy and the self-weight, or the lever must be lengthened to increase the buoyancy and the expansion ratio of the self-weight acting on the valve body. There was a problem of getting bigger.

Therefore, the technical problem of the present invention is to obtain a large valve opening force without enlarging the casing.

MEANS FOR SOLVING THE PROBLEM The technical means of the present invention taken to solve the above-mentioned technical problem forms an inlet, a valve chamber and an outlet in a valve casing,
A valve port that connects the valve chamber and the outlet is formed, and a lever with a valve element that opens and closes the valve port is attached to one end almost parallel to the displacement direction of the float. The first link and the second link to be operated are arranged substantially at right angles to the displacement direction of the float, and the float is accommodated in the space formed by the lever, the first link and the second link.

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

The float is displaced vertically with the liquid level in the valve chamber. The buoyancy of the float, which floats or descends and is displaced in the valve opening direction, or its own weight acts on the first link and the second link, and the other end of the lever is operated to open the valve opening of the valve body. The valve opening force due to the buoyancy of the float or its own weight is boosted by the link mechanism consisting of the first link and the second link, and the boosted valve opening force is further expanded by the lever principle, so that a large valve opening force Is obtained. Since the float is arranged in the space formed by the first link, the second link and the lever, it is not necessary to enlarge the valve chamber and the casing does not become large.

EFFECTS OF THE INVENTION The present invention produces the following unique effects.

The structure using a double valve mechanism or a pilot valve mechanism to increase the discharge capacity becomes complicated. Since a link mechanism is used in the present invention, the structure is simple.

Example An example showing a specific example of the above technical means will be described (first)
(See Figure and Figure 2).

This embodiment is applied to a closed float type steam trap. Incidentally, FIG. 1 shows the valve closed state and FIG. 2 shows the valve opened state.

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

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

An inlet 6 is formed in the upper portion of the lid 2 and an outlet 7 is formed in the lower portion. The inlet 6 communicates with the upper part of the valve chamber 4 and uses steam (not shown).
And the like to introduce condensate into the valve chamber 4. The valve seat member 8 is screwed to the lower portion of the lid 2, the valve chamber 4 and the outlet 7 are communicated with each other through the valve opening 9 formed in the valve seat member 8, and the condensed water of the valve chamber 4 is guided to the outlet 7. Inlet 6 and outlet 7 open horizontally
Each has a female thread for piping.

Hollow spherical float made of stainless steel thin plate in valve chamber 4
Accommodates 11. Float 11 floats on the condensate accumulated in valve chamber 4,
Ascends and descends with the liquid surface.

One end of the lever 12 is attached to the main body 1 with the fixing pin 13. The lever 12 can rotate around a fixed pin 13 as a fulcrum. Lever 12
A valve body 14 for opening and closing the valve opening 9 is attached to the. The other end of the lever 12 extends upward.

One end of the first link 15 is attached to the main body 1 with the fixing pin 16. The first link 15 can rotate around the fixed pin 16 as a fulcrum. The other end of the first link 15 extends laterally above the float 11. One end of the second link 17 is connected to the other end of the first link 15 by a swing pin 18. The other end of the second link 17 extends in the lateral direction, and the other end of the lever 12 is connected to the other end by a swing pin 19.

The float 11 is arranged in a space formed by the first link, the second link and the lever 12, and is connected to the swing pin 18.

The operation of the steam trap is as follows.

The inlet 6 is connected to a condensate generation place such as steam-using equipment. Condensate and steam flow into the valve chamber 4, and condensate is separated into a lower part and steam is separated into an upper part and accumulated. From the valve closed state of FIG. 1, the float 11 floats by applying a buoyancy force to the rocking pin 18 as the liquid level in the valve chamber 4 rises, and the first link 15 and the second link 17 are shown in FIG. As shown, lift up and rotate lever 12 counterclockwise. The valve body 14 opens the valve opening 9, and the condensed water in the valve chamber 4 is discharged from the valve opening 9 to the outlet 7. When the liquid level drops due to the discharge, the float 11 descends with it, and as the float descends, the first link 15 and the second link 17 are lifted, and the lever 12 rotates clockwise, as shown in FIG. Thus, the valve body 14 closes the valve opening 9 to prevent the outflow of steam. Such an operation is automatically repeated.

The float valve shown in the above embodiment can be used not as a steam trap but as an air trap for automatically discharging condensed water from the compressed air piping system. Further, if the arrangement state shown in FIGS. 1 and 2 is turned upside down, it can be used as an air vent for automatically discharging air from the water piping system.

[Brief description of drawings]

FIG. 1 is a sectional view showing a closed state of a closed float type steam trap of an embodiment of the float valve according to the present invention.
The figure is also a sectional view showing a valve open state. 1: Main body, 2: Lid 4: Valve chamber, 6: Inlet 7: Outlet, 9: Valve opening 11: Float, 12: Lever 14: Valve body, 15: First link 17: Second link

Claims (1)

[Claims] 1. A lever having a valve casing having an inlet, a valve chamber, and an outlet formed therein, a valve opening communicating with the valve chamber and the outlet, and a valve body having one end for opening and closing the valve opening attached to a float displacement direction. The first link and the second link, which are arranged substantially in parallel and operate the other end of the lever by the buoyancy of the float or the own weight, are arranged substantially at right angles to the displacement direction of the float, and the lever, the first link and the second link are arranged. A float valve that accommodates a float in the space formed by the link.