JPH0861596A - Float type trap - Google Patents

Abstract

PURPOSE: To provide a float type trap which can open and close the second valve hole which is large irrespective of the pressure difference between in front of and behind the second valve hole. CONSTITUTION: By the external surface a valve hole 6 is directly opened and closed with flotation and sinking of a float 16 which is installed in a valve chest 2. Over the float a lever 17 is installed so that it is lifted by the float which is lifted up and a valve member 11 is lifted through the lever, and thereby the second valve hole 7 is opened. A pressure receiving member 13 having a some smaller pressure receiving area is coupled with the valve member through a coupling rod 12, and the valve member, coupling rod, and pressure receiving member are provided with communication holes 15 which penetrate the undersurface of the valve member and the oversurface of the pressure receiving member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a float type trap which utilizes a difference in specific gravities of gas and liquid to automatically open and close a valve opening of a float to drain drainage.

Usually, in the float type trap, only a single valve opening is opened and closed by floating and descending the float. In this case, the area of the valve opening that can be opened and closed by the float was small, and it was not suitable for discharging a large amount of drain.

[0003]

2. Description of the Related Art One of the best conventional solutions to this inconvenience is shown in Japanese Patent Publication No. 57-8358. This is to open and close the valve opening directly on the outer surface by the float of the float placed in the valve chamber, and to open the second valve opening by the valve body that is driven to open by the float that floats. It is a thing. Although the area of the valve opening that can be opened and closed directly on the outer surface of the float is limited, a large amount of drain can be discharged because the floated float drives the valve member separately to open the second valve opening. Becomes

[0004]

In the above-mentioned conventional float type trap, the higher the pressure of the piping system to be attached, that is, the larger the pressure difference before and after the second valve opening,
Since the area of the second valve opening that can be opened and closed is small, it is still insufficient to increase the discharge capacity, which is a problem to be solved.

Therefore, a technical problem of the present invention is to provide a float type trap which can open and close a large second valve opening regardless of the pressure difference before and after the second valve opening.

[0006]

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned problems are to open and close the valve opening directly on the outer surface by floating and descending the float arranged in the valve chamber, and In the float trap in which the second valve opening is opened by the valve member driven to open by the above-mentioned float, the pressure receiving member formed to have a diameter slightly smaller than the valve member is connected to the valve member, and the valve body and the pressure receiving member are connected. It is characterized in that the fluid pressure is applied symmetrically to.

[0007]

The operation of the above technical means is as follows.
When the drain flows into the valve chamber, the float rises due to its buoyancy and opens the valve opening. And the flow that emerged
Drives the valve member to open the second valve opening. Since the pressure receiving member formed to have a diameter slightly smaller than the pressure receiving area of the valve member is connected to the valve member, and the fluid pressure is applied to the pressure receiving member symmetrically with the fluid pressure acting on the valve member, the front and rear of the second valve opening Even if there is a large pressure difference between the two, the force in the valve closing direction due to the fluid pressure hardly increases. Therefore, the large second valve opening can be opened regardless of the pressure difference before and after the second valve opening.

[0008]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIGS. 1 and 2). In this embodiment, a steam trap will be described as an example of the float trap. 1 shows the valve closed state, and FIG. 2 shows the valve opened state.

A valve casing 2 is formed inside the valve casing 1. An inlet 3 is opened on the upper side of the casing 1 at a position indicated by a broken line on the side facing the drawing, and an outlet 4 is opened coaxially with the inlet 3 on the front side of the drawing. The inlet 3 communicates with the valve chamber 2 through the inflow port 5, and the valve chamber 2 communicates with the outlet 4 from the valve port 6 and the second valve port 7 described below through the outlet passage 8.

A valve seat member 9 having a valve opening 6 opened in the lower portion of the valve chamber 2.
And the 2nd valve seat member 10 which opened the 2nd valve opening 7 is attached. The second valve seat member 10 has a cylindrical shape that penetrates vertically, and has two left and right second valve openings 7 formed in the periphery. Inside the second valve seat member 10, a valve member 11 having a seal ring (not shown) on its outer periphery is slidably arranged. The pressure receiving member 13 is connected to the valve member 11 via the connecting rod 12. The outer diameter of the pressure receiving member 13 is formed to be slightly smaller than the outer diameter of the valve member 11.

A second valve seat member 10 is provided on the upper wall of the valve casing 1.
Cylinder member 14 having an inner diameter slightly smaller than the inner diameter of
Is mounted coaxially with the second valve seat member 10, and the pressure receiving member 1
3 is slidably accommodated. A seal is provided on the outer circumference of the pressure receiving member 13.
A ring (not shown) is arranged to maintain airtightness with the inner circumference of the cylinder member 14. Valve member 11, connecting rod 12, pressure receiving member 13
A communication hole 15 penetrating up and down is opened in this to maintain the same pressure on the lower surface of the valve member 11 and the upper surface of the pressure receiving member 13. Connecting rod 12
Attach a lever 17 that extends above the float 16 below.

A hollow spherical float 16 is arranged in the valve chamber 2 in a free state. The float 16 ascends and descends together with the drain accumulated in the valve chamber 2 to directly open and close the valve opening 6 on the outer surface, and lifts the valve member 11 through the lever 17 to lift the second valve opening 7 during the ascending process. Open. Reference numeral 18 is a float seat that determines the descending position of the float 16.

Next, the operation will be described. The steam trap connects the inlet 3 to a steam using device (not shown) and automatically discharges the condensate generated in the steam using device. As shown in FIG. 1, the condensate flows into the valve chamber 2. Without Float 16
When the valve is descending, the valve opening 6 is formed on the outer surface of the float 16.
Is closed, the valve member 11 is also lowered by its own weight to close the second valve opening 7, and steam does not leak to the outlet 4.

When the drain flows into the valve chamber 2 from the inlet 3, the liquid level in the valve chamber 2 rises, and the float 16 also floats due to its buoyancy. Float 16 floats to lift valve 6
Is opened and the drain is discharged to the outlet 4. When the amount of drained inflow is larger than the amount of drained out through the valve port 6, the float 16 further rises, abuts against the lever 17, and lifts the valve member 11 through the lever 17. The second valve port 17 is opened, and the drain is discharged from the second valve port 7 to the outlet 4. When the drain is discharged and the liquid level in the valve chamber 2 is lowered, the float 16 is also lowered, and as the float 16 is lowered, the valve member 11 is also lowered and the valve opening 6 and the second valve opening 7 are closed. . This operation is repeated depending on the inflow amount of drain.

Since the valve member 11, the connecting rod 12, and the pressure receiving member 13 are formed with a communication hole 15 penetrating vertically, the lower surface of the valve member 11 and the upper surface of the pressure receiving member 13 are maintained at the same pressure.
Even if the pressure difference across the valve opening 7 is large, the large second valve opening 7 can be opened by the buoyancy of the float 16.

[0016]

The present invention produces the following unique effects. As described above, according to the present invention, the pressure receiving member formed to have a diameter slightly smaller than that of the valve member is connected to the valve member, and the fluid pressure is applied symmetrically to the valve body and the pressure receiving member. The large second valve opening can be opened and closed regardless of the pressure difference.

[Brief description of drawings]

FIG. 1 is a sectional view showing a valve closed state of an embodiment of a float type trap of the present invention.

FIG. 2 is a cross-sectional view showing the valve open state.

[Explanation of symbols]

 1 valve casing 2 valve chamber 3 inlet 4 outlet 6 valve opening 7 second valve opening 11 valve member 12 connecting rod 13 pressure receiving member 15 communication hole 16 float 17 lever

Claims (1)

[Claims] 1. A flow valve which opens and closes a valve opening directly on the outer surface by floating and descending a float arranged in a valve chamber, and opens a second valve opening by a valve member driven to open by the floating float. In the float trap, a pressure trap member having a diameter slightly smaller than that of the valve member is connected to the valve member, and a fluid pressure is applied symmetrically to the valve element and the pressure trap member.