JPH10227397A - Float type drain trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a float type drain trap which is opened and closed with one float under all pressure states from low to high pressure conditions. SOLUTION: An inlet 4, a valve chamber 3, and an outlet 5 are formed by a main body 1 and a bottom cover 2. A first valve port 8 and a second valve port 16 are formed for communicating the valve chamber 3 with the outlet 5. A cylindrical float 10 having a first valve body and a second valve body 18 respectively opening and closing the first valve port 8 and the second valve port 16 is arranged inside a valve chamber 3. An opening of the first valve port 8 on the side of the valve chamber 3 is located inside the cylindrical float 10. The first valve body 12 is connected to the inner side of the cylindrical float 10. The second valve opening 16 has the same opening area as that of the first valve port 8, and is located on a lower side of the cylindrical float 10. The second valve body 18 is connected to the lower side of the cylindrical float 10, to which fluid pressure of the inlet 4 and the outlet 4 are applied in the direction opposite to the first valve body 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention utilizes a specific gravity difference between a gas and a liquid to drive a valve body with a float housed in a valve chamber to condense steam, compressed air, and condensate generated in a gas piping system. Float type drain trap for automatically discharging drain such as water and condensed water.

[0002]

2. Description of the Related Art A conventional float type drain trap is disclosed, for example, in Japanese Patent Publication No. 7-92195. As understood from the publication, an inlet, a valve chamber, and an outlet are formed by casing, a valve port communicating the valve chamber with the outlet is provided in a lower portion of the valve chamber, and a valve body for opening and closing the valve port is connected. The float is placed in the valve chamber. When the liquid level rises due to the drain flowing into the valve chamber from the inlet, the float floats up and the valve body opens the valve port to discharge the drain to the outside. When the liquid level in the valve chamber drops due to the discharge of the drain, the float lowers and the valve body closes the valve port, thereby preventing gas outflow (leakage).

[0003]

In the above-mentioned conventional float type drain trap, the amount of drain that can be discharged is determined by the size of the valve port area, and is operated by the size of the valve port area and the pressure difference between before and after the valve port. The buoyancy of the float required is determined, but if the same float is used from low pressure to high pressure, a large valve opening area can be obtained at low pressure,
At high pressure, there is no other choice but to have a small valve port area, and there is a problem that valve seats having various types of valve ports must be replaced and exchanged according to the pressure range.

[0004] Therefore, the technical problem of the present invention is to provide a flow that can be opened and closed using the same flow from low pressure to high pressure.
To provide a drain trap.

[0005]

Means for Solving the Problems In order to solve the above technical problem, the technical means of the present invention is to form an inlet, a valve chamber, and an outlet by casing, and to communicate the valve chamber with the outlet. A valve in which a valve port is provided, a valve connecting the valve element is disposed in a valve chamber, and the valve port is opened and closed by the floating of the float. The valve chamber side opening end of the valve port is located inside the cylindrical float, the first valve body is connected to the inside of the cylindrical float, and the second valve having the same opening area as the first valve port. That the valve port is located below the cylindrical float, and that the second valve body on which the inlet and outlet fluid pressures act in opposite directions to the first valve body is connected below the cylindrical float. The feature is a float type drain trap.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a float type drain trap according to the present invention, a float is formed in a cylindrical shape, and an opening end of a first valve port on a valve chamber side is located inside the cylindrical float. The first valve body is connected to the inside of the cylindrical float, and the second valve port having the same opening area as the first valve port is located below the cylindrical float. Has a second valve body in which the fluid pressures at the inlet and outlet act in opposite directions, and are connected below the cylindrical float. Therefore, the fluid pressure acting on the first valve body can be canceled by the fluid pressure acting on the second valve body. Therefore, the opening and closing operation can be performed using the same float from low pressure to high pressure.

[0007]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). This embodiment is applied to a float type steam trap.

[0008] A bottom lid 2 is fastened to the main body 1 to form a casing having a valve chamber 3 therein. An inlet 4 and an outlet 5 are formed on the same axis at the upper part of the main body 1. The inlet 4 communicates with the upper part of the valve chamber 3. A partition wall 6 extending from the top wall to substantially the center of the valve chamber 3 is provided in the main body 1, and a first outlet passage 7 communicating with the outlet 5 is formed in the partition wall 6. A first valve seat 9 having a first valve port 8 is fixed to a bottom wall of the partition wall 6. The valve chamber 3 communicates with the outlet 5 from the first valve port 8 through the first outlet passage 7.

A bottomed cylindrical float 10 is arranged outside the partition wall 6. The first valve port 8 is located inside the float 10. A plurality of communication holes 11 are formed in the bottom wall of the float 10 to communicate the inside and the bottom. A first valve body 12 for opening and closing the first valve port 8 is fixed to the upper surface of the bottom wall of the float 10. The first valve element 12 is located inside the float 10, and the fluid pressure at the inlet 4 acts in the valve opening direction, and the fluid pressure at the outlet 5 acts in the valve closing direction. An upwardly extending valve rod portion 13 is formed in the first valve body 12, and is fitted into a guide hole 14 of the partition wall 6 so as to be vertically movable.

A second outlet passage 1 communicating with the outlet 5 to the bottom cover 2
5 is formed. A second valve seat 17 having a second valve port 16 formed in the same opening area as the first valve port 8 is fixed to the bottom cover 2. The valve chamber 3 communicates with the outlet 5 from the second valve port 16 through the second outlet passage 15. Second valve port 1 below float 10
6 is located. A second valve port 16 is provided on the lower surface of the bottom wall of the float 10.
The second valve body 18 that opens and closes is fixed. The second valve element 18 is located below the float 10, and the fluid pressure at the inlet 4 acts in the valve closing direction and the fluid pressure at the outlet 5 acts in the valve opening direction.
A valve rod portion 19 extending downward is formed in the second valve body 18, and is fitted to a guide hole 20 of the bottom lid 2 so as to be vertically movable. Float 10
A cylindrical screen 21 for catching foreign matter flowing into the valve chamber 3 from the inlet 4 is disposed outside the housing.

Next, the operation of the float type steam trap of this embodiment will be described. The state shown in FIG.
, The first valve body 12 closes the first valve port 8 and the second valve body 18 closes the second valve port 16.
Condensate and steam flow from the inlet 4 through the screen 21 to the valve chamber 3
The condensate separates and the vapor separates and accumulates in the upper part. When the liquid level rises due to the inflow of condensate water, the float 10 rises because of its increased buoyancy, and the first valve body 12 opens the first valve port 8 and the second valve body 18 opens the second valve port 16. . As a result, the condensate in the valve chamber 3 is moved from the first valve port 8 and the second valve port 18 to the first port.
The air is discharged to the outlet 5 through the outlet passage 7 and the second outlet passage 15. Since the fluid pressures acting on the first valve body 12 and the second valve body 18 are made equal in opposite directions, the opening / closing operation can be performed using the same float from low pressure to high pressure. When the liquid level in the valve chamber 3 drops due to the discharge of the condensate water, the float 10 descends with it, the first valve body 12 closes the first valve port 8, and the second valve body 18 closes the second valve port. Close 16. This prevents the outflow of steam.

[0012]

The present invention has the following specific effects. As described above, the float type drain trap according to the present invention is
Since opening and closing operations can be performed using the same float from low pressure to high pressure, there is no need to arrange valve seats having various types of valve ports.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a float type steam trap according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Bottom cover 3 Valve room 4 Inlet 5 Outlet 8 1st valve port 10 Float 12 1st valve element 16 2nd valve port 18 2nd valve element

Claims (1)

[Claims] An inlet, a valve chamber, and an outlet are formed by casing, a valve port communicating the valve chamber with the outlet is provided, and a float connected to the valve body is disposed in the valve chamber. In a valve in which a valve body is opened and closed by a floating body, a float is formed in a cylindrical shape, and an opening end of a first valve port on a valve chamber side is located inside the cylindrical float, and a first valve is provided. The body is connected to the inside of the cylindrical float, and the second valve port having the same opening area as the first valve port is located below the cylindrical float, and is opposite to the first valve body. A float type drain trap, wherein a second valve body on which inlet and outlet fluid pressures act is connected below the cylindrical float.