JPH02134496A - Float valve - Google Patents

Abstract

PURPOSE:To automatically exhaust either the gas or liquid selectively by furnishing a valve hole in the upper or lower part of a valve chest with the gas and liquid separated, installing a lever to open and close the valve hole with vertical motion of a float provided in the valve chest, cutting the bottom of the lever, and applying the force of the float in the direction of valve opening to the side of the valve body. CONSTITUTION:An inlet 6 is connected with a pointer where condensate is generated. The condensate and vapor flow into a valve chest 4, wherein they are separated and the former stagnates in the lower part and the latter in the upper part. A float 11 rises together with the liquid surface to come in contact with a lever 13 and side wall 16. Further rise of the liquid surface results in application of the buoyancy of the float to the lever 13 in the form of wedging action to allow a valve body 15 to open a valve hole 9. Condensate in the valve chest 4 is exhausted from valve hole 9 to the outlet 7, and the liquid surface will sink. Together with this sinking of the float the lever 13 rotates in the direction of valve closing, and the valve body 15 blocks the valve hole 9 to prevent outflow of the vapor. In case there is leakage of condensate at the valve hole, the liquid surface will further sink to cause the float 11 to contact the lower part of the lever 13, and thus the valve opening force is increased to prevent outflow of the vapor.

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 structure 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. A steam trap that automatically discharges condensate generated in a steam piping system, an air trap that automatically discharges condensed water generated in a compressed air piping system, and a vent that automatically discharges air mixed in a water piping system. 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 the valve chamber, the valve opening is placed at the top or bottom of the valve chamber, and the valve is activated by the vertical movement of a float housed in the valve chamber. The means is driven to open and close the valve port to selectively and automatically discharge one of the fluids.

Conventional technology The applicant has developed a float valve that can obtain a large opening force.
This was proposed in Japanese Patent Application No. 63-231242. this is,
The valve casing forms an inlet, a valve chamber, and an outlet, a valve port that communicates the valve chamber and the outlet, a float is placed in the valve chamber in a free state, and a lever equipped with a valve body that opens and closes the valve port is connected to the valve. The lever is hinged to the chamber, one end of the lever is extended at an acute angle with respect to the displacement of the float in the valve opening direction, and the other end of the lever is rotated in the valve closing direction by the force of the float in the valve closing direction. The valve is extended from the closed state to receive further valve closing force.

Problems to be Solved by the Present Invention In the above-mentioned system, when the pressure in the piping system on the inlet side becomes high, the valve port can be slightly opened but cannot be fully opened. In other words, since the other end of the lever is extended so that the force of the float in the valve closing direction is applied, the fluid discharged from the valve opening to the outlet collides with the other end of the lever after slightly touching the valve opening. This is because the valve tries to rotate the lever in the valve-closing direction.

Therefore, the technical problem of the present invention is to prevent the discharged fluid from generating a force that rotates the lever in the valve closing direction.

Means for Solving the Problems One aspect of the present invention taken to solve the above-mentioned technical problems is to provide a valve in which an inlet, a valve chamber, and an outlet are formed in a valve casing, and the valve chamber and the outlet are communicated with each other. A float is placed in the valve chamber in a free state, a lever with a valve body for opening and closing the valve port is hinged to the valve chamber, and one end of the lever is set at an acute angle with respect to the displacement of the float in the valve opening direction. Tighten and stretch,
The other end of the lever is cut off, and the force in the valve closing direction of the float acts on the float side of the valve body.

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

Since the other end of the lever is cut off, there is no possibility of the discharge fluid colliding with the lever and causing it to rotate in the valve closing direction.

Further, since the force of the float in the valve closing direction is applied to the float side surface of the valve body, the lever can be rotated in the valve closing direction or can receive the valve closing force roughly from the valve closed state.

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

If the other end of the lever was extended as in the conventional example above, the inlet side pressure could not be fully opened at 2.7 kg/Ci, but in the present invention, under the same conditions, the lever could not be fully opened. /
I was able to fully open up to cr.

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 flow i-type steam trap.

A valve casing 2 having a valve chamber 4 therein is formed by fastening the valve 2 to the main body 1 with bolts (not shown).

A gas scaler 1 and 5 are interposed between the main body 1 and the cover 2 to maintain airtightness between the two.

An inlet 6 is formed in the upper part of the lid 2, and an outlet 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).
'8 to direct condensate into the valve chamber 4. The valve seat member 8 is screwed to the lower part of the valve seat member 8, and the valve chamber 4 and the outlet lower are communicated through the valve port 9 formed in the valve seat member 8, and the condensate in the valve chamber 4 is guided to the outlet lower V.

The inlet 6 and the outlet lower 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 caskerat 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. The state shown in FIG. 1 shows the state in which the float is at its lowest position, and the float 1 is in contact with the lower part τ (surface 20 of the valve chamber 4 and the side surface of the float 11 of the valve body 15 described below).

Attach the lever 13 to the lever 2 with the pin 14 and connect it with a hinge. A valve body 15 for opening and closing the valve port 9 is attached to the lever 13 with a snap ring 21. Therefore, the lever 13
It can rotate using 4 as a fulcrum.

The upper part of the lever 13 extends above one of the floats 11 at an angle of α from the vertical line, and its tip extends at an angle of β from the vertical line. The lower part of the lever 13 is cut to leave enough length to make contact with the bimetal 18 described below.

A side wall 16 (left side in FIG. 1) of the valve chamber 4 extends vertically. Reference number @17 is a rib that guides the float 11 in the vertical direction, and is formed at two locations in total, one on the near side of the page, and a slight gap is formed between it and the flows 1 to 11.

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

The bimetal 18 has a substantially zero-shaped shape and expands when the temperature is low, exerting the force that pushes up the lever 13 to open the valve, and changes to a shape that does not involve the lever 13 by narrowing at high temperatures.

The operation of the steam wrap 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 floats together with the liquid level in the valve chamber 4 and comes into contact with the lever 13 and the side wall 16. Furthermore, when the liquid level reaches 1 stomach, the buoyant force on the flow 1 increases, and the buoyant force acts on the lever 13 as a detection force. With this power,
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 decreases due to discharge, the floats (]-1 to 11 descend with it, and as the float descends, the lever 13 moves in the valve closing direction (counterclockwise in Fig. 1).
The valve body 15 closes the valve port 9 and prevents steam from flowing out. Normally, in this state, the flow (-11) is not in contact with the lower slope 20 of the valve chamber 4 and the side surface of the float 11 of the valve body 15, but if water leaks from the valve port 9, the liquid level will further drop. Then, the float 11 descends to the position shown in FIG.
It comes into contact with the lower part of the lever 13 to increase the valve closing force and prevent steam from flowing out. This kind of operation is automatically repeated.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a closed float type steam trap as an embodiment of the float valve of the present invention. 1: Main body 2: Benefit 4: Valve chamber 6 Two-man lower: Outlet 9: Valve port 11: Float 13 Nilever 15: Valve body 11ω

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 hinged to the valve chamber, one end of the lever is extended at an acute angle with respect to the displacement of the float in the valve closing direction, the other end of the lever is cut, and the force in the valve closing direction of the float is applied to the side of the float on the valve body. A float valve that is activated.