JPH0335560B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Application of the Invention> The present invention relates to an improvement of a valve section of a steam trap mainly for discharging condensate.

<Prior Art> The valve section of a conventional float type steam trap, mainly for discharging condensate, is as shown in FIG.
That is, a valve hole 4 is provided between a condensate reservoir chamber 2 connected to an inlet 1 and an outlet 3, and a float valve 5 closes the valve hole 4 in response to the water level in the condensate reservoir chamber 2. The valve is displaced between a closed position and an open position in which the valve hole 4 is opened, and near the closed position, a valve closing force is applied due to the pressure difference between the inlet side and the outlet side. The valve seat member 6 is attached to the wall 7 to form the valve hole 4.
It is fixedly provided for.

When this steam trap is in use,
When condensate flows into the condensate storage chamber 2 from the inlet 1 side,
When the float valve 5 floats up, it opens and the liquid is discharged through the valve hole 4 and the outlet 3. When the condensate is discharged, the float valve 5 is lowered and closed.

Furthermore, in conventional steam traps, the size of the valve hole in the valve seat member 6 is usually small depending on the steam pressure used, and is small for high pressure applications and relatively large for low pressure applications.

<Problems to be Solved by the Invention> As mentioned above, the valve hole of the conventional condensate discharge valve is formed small for high pressure applications, so it is difficult to use the high pressure valve seat member for low pressure applications. When a large amount of condensate cannot be discharged. That is, there is a problem in that the valve seat member cannot be used both for high pressure and low pressure.

<Means for Solving the Problems> The means of the present invention includes, in the conventional steam trap as described above, a first valve seat fixedly provided on the side of the condensate reservoir chamber in the valve hole portion; an annular shape having a cylindrical shape that is open at both ends and having a small hole in the middle that communicates between the inside and the valve hole of the first valve seat, and that is accommodated in the valve hole of the first valve seat so as to be able to move forward and backward, and that is formed on the outside; a second valve seat member having an enlarged portion that closes the gap in contact with the first valve seat and a second valve seat on which the float valve is seated at the end on the condensate reservoir chamber side; and the second valve seat member is connected to the first valve seat. It is characterized by comprising a spring provided so as to push the condensate from the seat side toward the condensate reservoir chamber side.

<Function> This steam trap has a second valve seat whose valve hole is closed by a float valve, and a first valve seat whose annular valve hole is closed by an enlarged portion of the second valve seat member. , when the inlet side, that is, the condensate storage chamber side, is at a low pressure below a predetermined pressure, such as at the time of startup, the second
The valve hole of the valve seat presses the second valve seat member toward the float valve side by the action of the spring, opening the valve, and when condensate flows into the condensate reservoir chamber, the float valve floats to the surface. , discharge condensate from both valve holes. When the pressure increases and the condensate disappears, the valve hole of the second valve seat closes, and this closure increases the effective pressure-receiving area of the second valve seat member, and the acting force from the float side is applied, so it resists the spring. Then, the second valve seat member moves and closes the valve of the first valve seat with the enlarged portion.

When low pressure steam is used and a steady state is reached, the valve holes are closed in sequence as described above after condensate is discharged. When a small amount of condensate flows in, the valve hole of the second valve seat opens, and when a large amount of condensate flows in, the second valve seat opens.
Following the opening of the valve hole in the valve seat, the valve hole in the first valve seat opens.

When high-pressure steam is in use and a steady state is reached, the internal pressure acts on the second valve seat member and moves the second valve seat member against the spring to close the valve hole of the first valve seat. Persist state. Therefore, when condensate flows in, only the valve hole in the second valve seat opens.

<Example> An example will be described using FIG. 1. In this figure, parts equivalent to those of the conventional steam trap explained using FIG. 2 are designated by the same reference numerals, and the explanation thereof will be omitted. The difference from the one in FIG. 2 is the condensate discharge valve section, which is composed of a first valve seat member 11, a second valve seat member 12, a spring 13, and the like.

The first valve seat 11 has a cylindrical member 14 having a thread on its outer periphery, which is screwed so as to pass through the wall 7.
It is formed at the side end of the condensate reservoir chamber 2. The valve hole of the first valve seat 11 has an annular shape formed between it and a second valve seat member 12, which will be described later, and a spring 13 is installed in the annular space. The annular space is a spring 13
The area from the step to the passage 15 on the outlet 3 side has a small inner diameter, and the slide pipe 16
is installed.

The second valve seat member 12 is formed into a cylindrical shape with openings at both ends that pass through the slide pipe 16 and reach the passage 15 from the condensate reservoir chamber 2 side, and can move forward and backward along the slide pipe 16 toward the float valve 5 side. be. Also, condensate storage room 2
An enlarged part 17 is provided on the side, which is enlarged at a part of the outer periphery, and this enlarged part can come into contact with the first valve seat 11 and close the annular valve hole. Said spring 13
The second valve seat member 12 has one end abutting this enlarged portion.
This acts to push out the water toward the float valve 5, opening the annular valve hole. An end of the second valve seat member 12 on the float valve 5 side is formed as a second valve seat 18 . In the figure, 19 is a small hole, which communicates the inner hole of the second valve seat member 12 with the annular valve hole of the first valve seat 11. 20 is a retaining ring. Also, 21 is 2
With the protrusion of the strip, the float valve 5 in the closed position is
It is arranged to tilt toward the valve seat 18 and come into contact with it.

When the pressure difference between the inlet 1 side and the outlet 3 side is very large, the condensate discharge valve part of the steam trap receives pressure from the condensate reservoir chamber 2 side of the second valve seat member 12. The acting force of the spring 13 overcomes the reaction force of the spring 13, and the second valve seat member 12 moves toward the passage 15. Therefore, the float valve 5 remains in this state and opens and closes with respect to the second valve seat 18 to discharge condensate.

In addition, in a usage state where the pressure difference between the inlet 1 side and the outlet 3 side is so small that the valve hole of the second valve seat 18 is not closed, the ascites reservoir chamber 2 side of the second valve seat member 12 The action of the received pressure is smaller than the reaction force of the spring 13, and when the valve hole of the second valve seat 18 is closed, the pressure receiving area corresponding to the valve hole increases so as to overcome the reaction force of the spring 13. Then, the second valve seat member 12 moves to close the valve hole of the first valve seat 11. Therefore, the float valve 5 floats to the second valve seat 1.
When the valve hole 8 is opened, the valve hole of the first valve seat 11 is opened, and condensate water is discharged from both valve holes, and when the valve hole of the second valve seat 18 is closed by the float valve 5. The valve hole of the first valve seat 11 is closed.

This state of small pressure difference between the inlet 1 side and the outlet 3 side exists temporarily during startup even when high-pressure steam is used, so at that time condensate is similarly discharged from both valve holes. When the pressure on the inlet 1 side reaches a certain level, the valve hole of the first valve seat 11 is closed.

Therefore, the condensate discharge valve portion of this steam trap can be used in common for both high pressure and low pressure steam traps.

<Effects of the Invention> In the steam trap of the present invention, the condensate discharge valve portion can be used both for high pressure and low pressure. Therefore, there is no need to prepare different valve seat members for high pressure and low pressure as in the past. Also,
When used for high pressure, condensate is discharged from both valve holes at the low pressure of start-up at the start of operation, so the start-up is faster than conventional high-pressure ones.

[Brief explanation of the drawing]

FIG. 1 shows one embodiment of the present invention; a is a longitudinal side view, b is an enlarged view of the main part of a, and FIG. 2 is a longitudinal side view of a conventional steam trap. 1...Inlet, 2...Condensate storage room, 3...Exit,
5...Float valve, 11...First valve seat, 12...
Second valve seat member, 13... Spring, 17... Enlarged portion,
18...Second valve seat, 19...Small hole.

Claims (1)

[Claims] 1 The valve hole opened in the condensate reservoir chamber is closed to the closed position and the valve hole is opened to the open position in response to the water level of the condensate reservoir chamber so as to open and close between the condensate reservoir chamber connected to the inlet and the outlet. In a steam trap that has a float valve that is displace- able to the position and receives a valve-closing force due to the pressure difference between the inlet side and the outlet side near the closed position, the upper air valve hole part is restored. The first valve is formed into a cylindrical shape with a first valve seat fixedly provided on the side of the water reservoir, and a small hole in the middle that communicates between the inside and the valve hole of the first valve seat and open at both ends. It has an enlarged part that is movably accommodated in the valve hole of the seat and closes an annular gap formed on the outside in contact with the first valve seat, and has a second valve seat on which the float valve is seated at the end on the condensate reservoir chamber side. A steam trap characterized by comprising a second valve seat member and a spring provided to push the second valve seat member from the first valve seat side toward the condensate reservoir chamber side.