JPH02212697A - Float valve - Google Patents

Abstract

PURPOSE:To reduce the occurrence of leakage and provide a desired discharge flow rate by means of a discharge flow passage having low line resistance by a method wherein a first valve port is opened and closed directly by means of the outer surface of a float, a lever to which a valve body to open and close a second valve port is mounted is pivotally joined to the interior of a valve chamber, and after the first valve port is opened, the one end of the lever is brought into contact with the float for opening. CONSTITUTION:When a level is lowered due to discharge, a float 8 is also lowered. Simultaneously, with lowering of the float 8, a lever 28 is rotated in an opening direction to close a second valve port 18 by means of a valve body 32, and outflow of condensate through the second valve port 15 is stopped. When a level in a valve chamber 4 is further lowered, the float 8 is lowered, a first valve port 14 is opened to completely stop outflow of condensate. In this case, since two lines of float seats 26 are formed in parallel to the center of the first valve port 14, the lowering float 8 seats a first valve seat 16 at the same time when the float makes contact with the float seat 26 to completely close the first valve port 14.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a float valve that uses the difference in specific gravity between gas and liquid to open and close the valve port with a float to automatically discharge liquid from a gas-liquid mixing system. .

The float valve is a steam trap that automatically discharges condensate generated in the steam piping system, a wrap to air 1 that automatically discharges condensed water generated in the compressed air 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 level. Float valves take advantage of these natural laws, separating gas and liquid in the valve chamber, placing the valve port at the bottom of the valve chamber, and opening and closing the valve port by moving the float housed in the valve chamber up and down. , selectively and automatically draining liquid.

<Conventional technology> As a float valve, there is, for example, a float type i~lap.

In this method, a valve opening is opened in the lower part of the valve chamber, and this valve opening is opened and closed directly on the surface of the flow j~ placed freely inside the valve chamber. This trap was commercially available with one valve opening opened and closed by one float, and the area of the valve opening was small, making it unsuitable for discharging a large amount of fluid.

As a trap to solve this problem
Those shown in the official gazette will be marketed. The first valve opening is opened at a lower position in the valve chamber, and the second valve opening is opened at a higher position than the first valve opening. The first valve port is opened and closed directly on the surface of the flow i~ to be
A valve body for opening and closing the valve port is installed.One end is connected to the valve body to operate the valve body, and the other end extends above the float so that the float comes into contact with it after opening the first valve port. It consists of a lever that has been pulled.

<Problems to be Solved by the Present Invention> However, in the above-mentioned laps 1 to 3, there was a problem that a desired and sufficient discharge flow rate could not be obtained despite the provision of two valve ports. This is because the second valve port is located at a high position, and there are places where the pipe resistance increases such as bends while communicating with the outlet, so even if the valve port is fully open, the desired flow rate may not flow. be. In addition, if the valve port is placed at a high position in the valve chamber, the valve port will be present in the gas atmosphere, and therefore water sealing will not be possible, leading to gas leakage.
Since the valve seat that forms the valve opening and the corresponding float are made of metal, the sealing performance becomes worse. Further, in the trap described above, a coil spring is provided to close the valve body that opens and closes the second valve port, which has the disadvantage of requiring a large number of parts.

Therefore, the technical problem of the present invention is to provide a float valve having two valve ports, which has a simple structure and less gas leakage.
It is an object of the present invention to provide a float valve that can obtain a desired discharge flow rate.

<Means for solving the problem> An inlet and an outlet are formed in a valve casing having a valve chamber, and a first valve port and a second valve port are provided below the valve chamber to communicate the valve chamber and the outlet via a discharge passage. A float that opens and rises and falls according to the liquid level in the valve chamber is housed in a free state in the valve chamber, the first valve port opens and closes directly on the outer surface of the float, and a valve body is installed that opens and closes the second valve port. A lever is pivotally connected in the valve chamber, and one end of the lever comes into contact with the float after opening the first valve port and opens the second valve port.
The valve ports are arranged to open, and the discharge passages for the first and second valve ports are formed as smooth pipes so as to reduce pipe resistance.

<Operation> The float accommodated in the valve chamber in a free state moves up and down along with the liquid level within the valve chamber. When the inflow flow rate is large, the float opens the first valve port and the second valve port via the lever to discharge the fluid. In this case, the first valve port and the second valve port are both located at the lower part of the valve chamber, and a smooth discharge passage is formed between the first valve port and the outlet, so that the pipe resistance is reduced.

<Example> An example showing a specific example of the above technical means will be described. (
(See Figure 1) This embodiment can be applied to closed float type steamers 1 to 3.

A lid 2 is fastened to a main body 1 with a bolt 3 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.

A population 6 is formed in the upper part of the main body 1, and an exit lower part is formed in the lower part. The inlet 6 communicates with the upper part of the valve/domain 1, is connected to steam-using equipment (not shown), etc., and introduces condensate into the valve chamber 4. A first valve seat 16 having a first valve port 14 and a second valve seat 20 having a second valve port 18 are screwed to the lower part of the main body 1 through gaskets 15 and 19, respectively. First valve port 14
The second valve port 18 communicates the valve chamber 4 with the outlet lower part through a discharge passage 22 formed in the main body 1, and leads the condensate in the valve chamber 4 to the outlet lower part. The discharge passage 22 is almost one common passage, and is formed in a shape with as few bends and constrictions as possible.

The inlet 6 and the outlet lower are opened in the horizontal direction, and each form a female thread for piping.

A hollow spherical float 8 made of a thin stainless steel plate is housed in a valve chamber 4 in a free state. The float 8 floats on the condensate accumulated in the valve chamber 4 and ascends and descends with the liquid level. Two protrusions are formed on the bottom surface of the valve chamber 4 substantially parallel to the central axis of the first valve port 14 to form a float seat 26.

Attach a lever attachment member (not shown) to the main body 1 with screws. The lever 28 is attached to the lever attachment member using the pin 30.

A valve body 32 for opening and closing the second valve port 18 is attached to the lever 28. Therefore, the lever 28 can rotate using the pin 30 as a fulcrum. The upper part of the lever 28 extends at an angle α from the vertical line, and the upper part of the lever 28 extends diagonally above the float 8 at an angle β from the vertical line.

The gas scales 1 to 5 between the main body 1 and M2 are made of Teflon or the like, and are also present on the inner wall of the valve chamber 4, so that when the float 8 moves upward without coming into contact with the lever 28, To reduce the frictional resistance of the contact part.

The operation of the above steam trap is as follows.

Population 6 is connected to condensate generation points such as steam-using equipment. Condensate and steam flow into the valve chamber 4, and the condensate and steam are separated and accumulated in the upper part and the condensate in the lower part. Float 8 when the inflow of condensate is small
Only the first valve port 14 is opened and closed, and the condensate flows through the first valve port 14.
It flows out to the outlet lower through the valve port 14 and the discharge passage 22. When the amount of condensed water in the valve chamber increases, the float 8 rises as the liquid level rises, causing the lever 28 and the gas kerater 1 on the inner wall of the casing to rise.
~Abuts on 5. When the liquid level further rises, the buoyant force of the float 8 acts on the lever 28 as a force. This force causes the lever 28 to rotate in the valve opening direction (clockwise in FIG. 1), causing the valve body 32 to open the second valve port 18. The condensate in the valve chamber 4 is discharged from the first valve port 14 and at the same time, is discharged from the second valve port 18 to the lower outlet. At this time, the first valve port 14 and the second valve port 18 communicate with the outlet lower via a common discharge path 22, and the discharge path 22 is formed smoothly, so that the pipe resistance is small. Become something.

When the liquid level falls due to discharge, the flow 1-8 also falls, and as the float 8 descends, the lever 28 rotates in the valve closing direction, the valve body 32 closes the second valve port 18, and the return from the second valve port 1B is prevented. Stop water runoff. If the liquid level in the valve chamber 4 further decreases, the flow 1-8 will drop and the first valve port 14 will also close as shown in FIG. 1, completely stopping the outflow of condensate. At this time,
Since the float seat 26 is formed in two rows parallel to the center axis of the first valve port 14, the float 8 that has descended will be attached to the float seat 2.
6 and at the same time seats on the first valve seat 16, completely closing the first valve port 14.

Further, the second valve port 18 of the second valve seat 2Q has a float 8 that is connected to the first valve port 18.
By setting the valve port 14 at a position lower than the liquid level when the valve is completely closed, the valve body 32 and the second valve seat 20 are constantly submerged in water, and the sealing performance between the valve body 32 and the second valve seat 20 is reduced. Improves and prevents steam leakage.

<Effects of the Invention> Since the sub-valve is used, the amount of condensate discharged is increased, and the pipe resistance in the discharge passages leading from both valve ports to the outlet is small, reducing loss, thereby achieving the desired sufficient amount of water. It is possible to obtain a suitable discharge flow rate. In addition, since both valve ports are always submerged in water, the sealing performance between the valve body and valve seat is greatly improved due to the water utilization effect. Further, unlike the conventional method, a coil spring for closing the second valve port is not required, and the structure is simple and the number of parts is reduced.

Further, since the pressure on the secondary side of the second valve port increases due to the condensate discharged from the first valve port, the pressure difference acting on the second valve port becomes small. Therefore, the second valve port can be opened and closed with a small operating force, or the valve port can be designed to be larger accordingly, so that the discharge flow rate can be further increased.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a closed float type steam trap according to an embodiment of the flow 1 valve of the present invention. 1: Main body 2: M 4: Valve chamber 6: Inlet A: Outlet 8: Float 14: First valve port 16; First valve seat 18: Second valve port 20: Second valve seat 22: Discharge path 28 Nirepa-1

Claims (1)

[Claims] 1. An inlet and an outlet are formed in a valve casing having a valve chamber, and a first valve port and a second valve port are opened in the lower part of the valve chamber to communicate the valve chamber and the outlet via a discharge passage, and the liquid in the valve chamber is A float that rises and falls according to the position is housed in a free state in a valve chamber, the first valve port opens and closes directly on the outer surface of the float, and a lever with a valve body that opens and closes the second valve port is pivoted in the valve chamber. The lever is coupled so that one end of the lever contacts the float to open the second valve port after opening the first valve port, and the lever has a discharge passage for the first valve port and the second valve port. A float valve characterized by having a smooth conduit formed to reduce conduit resistance.