JP2802466B2 - Float valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a float valve for opening and closing a valve port on an outer surface of the float, and more particularly to a valve capable of securely closing the valve port by weight. Float valves are used as steam traps for discharging condensed water generated by condensation of steam in the steam piping system, and air traps for discharging condensed water generated in the compressed air piping system. .

[0002]

2. Description of the Related Art A conventional float valve is disclosed, for example, in Japanese Utility Model Publication No. 63-12318. In this method, the float is placed in the valve chamber in a free state, and the valve port is opened and closed on the outer surface of the float, so that two float seats are formed on the valve chamber wall in parallel with the valve port axis. It was done. By forming the two float seats, when the float is displaced and seated on the float seat to close the valve port, the valve can be reliably closed.

[0003]

The conventional float valve described above has a problem that the valve port cannot be reliably closed on the outer surface of the float, particularly when the pressure difference between the front and rear of the valve port is large. there were. This is because if the pressure difference around the valve port is large,
When the float is displaced and approaches the float seat and the valve port, the float is sucked by the pressure difference to the valve port side. When the seat cannot be seated, the seat is seated on the valve port and one of the float seats, and cannot be seated on the other float seat, and the float is out of the original closed position. Therefore, it becomes impossible to securely close the valve port.

Accordingly, a technical problem of the present invention is that even if the pressure difference before and after the valve port is large, the valve port can be reliably closed without the float deviating from the original closing position. It is to get a valve.

[0005]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is to form an inlet, a valve chamber and an outlet by valve casing, and connect the valve chamber and the outlet. A valve opening for opening and closing the valve opening on the outer surface of the float and a float seat provided in the valve chamber;
A weight is attached to a substantially central portion of the member via an elastic member so as to be displaceable.

[0006]

The operation of the above technical means is as follows.
By installing a displaceable weight in the float,
When the float is displaced and approaches the float seat and the valve port, the weight is displaced within the float in accordance with the swing of the float. The position of the center of gravity of the float also changes according to the displacement of the weight. Even if the outer surface of the float is sucked into the valve port and seated on only one of the float seats, the float will be moved to the valve port and one of the float seats due to the change in the center of gravity of the float. While sitting on the other float seat, the original flow
Can be returned to the closed position, and the valve port can be reliably closed.

[0007]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). This embodiment shows an example of a float type steam trap using a hollow float. The body 1, 2 and the inner wall 3 are combined by welding, respectively,
The inlet member 5 and the outlet member 6 are similarly attached to the main bodies 1 and 2 by welding to constitute a valve casing.
The inlet member 5 and the outlet member 6 have internal thread portions 7 for pipe connection,
8 is formed. The valve chamber 4 communicates with a steam piping system (not shown) by a female screw portion 7. The valve seat 9 is attached to the inner wall 3 below the valve chamber 4. The valve seat 9 is provided with a penetrating valve port 10 to communicate the valve chamber 4 with the female screw portion 8 on the outlet side. A hollow float 11 is arranged in the valve chamber 4 in a free state. The outer surface of the float 11 contacts the end of the valve hole 10. A weight 14 is inserted into a hollow portion of the float 11 through two coil springs 12 and 13.
Is mounted so as to be displaceable substantially in the center. Coil spring 1
One end of each of the members 2 and 13 is fixed to the inner wall of the float 11, and the other end is fixed to the surface of the weight 14. At the lower part of the float 11, a float seat 15 is attached in parallel with the axis of the valve port 10. The illustrated float seat 15 is located at the back of the drawing float 11, and although not shown, a similar float seat is provided in front of the drawing float 11 to provide two float seats. I do. Therefore, when the float 11 is located at the lowest position as shown in FIG. 1, the outer surface of the float 11 is supported by a total of three points including the end of the valve port 10 and the two float seats 15. Will be done. Reference numeral 20 denotes a porous screen for capturing foreign matter in the fluid flowing into the valve chamber 4.

In this embodiment, an example is shown in which the weight 14 is attached via the two coil springs 12 and 13.
The number of coil springs is not limited to two, but may be three or four.

Next, the operation will be described. A mixed fluid of condensate and steam generated in a steam piping system (not shown) flows into the valve chamber 4 from the female screw portion 7 on the inlet side. When the condensed water accumulates in the valve chamber 4, the float 11 is lifted by its buoyancy to open the valve port 10, and the condensed water is discharged out of the system via the female screw portion 8 on the outlet side. When the condensate in the valve chamber 4 is discharged, the float 11 descends to close the valve port 10 and the two float seats 15.
Thus, the steam is prevented from being discharged to the outlet side.

When the float 11 descends from the floating position to the valve port 10 and the float seat 15, the water surface in the valve chamber 4 becomes wavy due to the condensed water flowing in, and the float 1 is floated.
1 also swings accordingly. When the float 11 swings, the internal weight 14 is similarly displaced, and the coil spring 1
Due to the balance with the elastic forces 2 and 13, the displacement is further irregular. The pressure difference between the inlet side and the outlet side is large,
When the pressure difference between the front and rear is large, when the float 11 descends, the float 11 is sucked toward the valve port 10 according to the pressure difference. Also in this case, the float 11 swings and the internal weight 14 is displaced. Float 11 is Nijo
The weight 14 is displaced and the position of the center of gravity of the float 11 is changed even when the seat 14 is seated on one of the float seats 15 and the valve port 10 and is not at the original seating position. That is, when the weight 14 is displaced to the front of the drawing float 11, the float 11 can be seated on both of the two float seats to return to the original seating position, and the valve port 10 can be securely held. Can be closed.

[0011]

The present invention has the following specific effects. As described above, according to the present invention, the weight in the float is displaced in accordance with the displacement of the float to change the position of the center of gravity of the float. As a result, the seat can be returned to another seating position, that is, the original seating position of the float, and the valve port can be reliably closed.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of a float valve of the present invention.

[Explanation of symbols]

 1, 2 Main body 3 Inner wall 4 Valve chamber 5 Inlet member 6 Outlet member 9 Valve seat 10 Valve port 11 Float 12, 13 Coil spring 14 Weight 15 Float seat

Claims (1)

(57) [Claims] An inlet, a valve chamber, and an outlet are formed by valve casing, a valve port communicating the valve chamber with the outlet is provided, and the valve port is opened and closed on the outer surface of the float, and the valve is opened and closed. A float valve in which a weight is attached to a substantially central portion of the float via an elastic member so as to be displaceable, in which the seat is provided in a valve chamber.