JPH1182885A - Float type drain trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a float type drain trap that can open/close a valve hole with large opening area from low pressure to high pressure. SOLUTION: An inlet 4, a valve chamber 3 and an outlet 11 are formed at a casing formed of a body 1 and a cover body 2. A first valve hole 12 is provided to communicate the valve chamber 3 with the outlet 11. A float 14 opening/closing the first valve hole 12 is arranged in the valve chamber 3. In such a float type drain trap, a second valve hole 13 is provided below the first valve hole 12. A valve element 15 with its effective pressure receiving area equal to the opening area of the first valve hole 12 and with fluid pressure of the inlet 4 and outlet 5 acting retrorse to the float 14 is connected to the float 14, and the second valve hole 13 is opened/closed by the displacement of the valve element 1 caused by floatation and drop of the float 14. In this case, fluid pressure acting upon the float 14 can be nullified by fluid pressure acting upon the valve element 15 so as to be able to open/close the valve hole with large opening area from low pressure to high pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention automatically opens and closes a valve port by floating and lowering a float housed in a valve chamber and automatically drains condensed water and condensed water generated in steam, compressed air and gas piping. The present invention relates to a float type drain trap that discharges air.

[0002]

2. Description of the Related Art The basic structure of a conventional float type drain trap is disclosed, for example, in Japanese Patent Publication No. 55-47279. 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, and a float for opening and closing the valve port is disposed 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 opens the valve port to discharge the drain to the outside. The gas flows out (leakage) is prevented by lowering the float and closing the valve port.

[0003]

In the above-mentioned conventional float type drain trap, the amount of drain that can be discharged is determined by the opening area of the valve port. The required float buoyancy 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 and a small valve opening area at high pressure There was a problem that said.

Accordingly, an object of the present invention is to provide a float type drain trap which can open and close a valve port having a large opening area from low pressure to high pressure.

[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 casing, and to communicate the valve chamber with the outlet. First
A valve port is provided, a float is disposed in a valve chamber, and a first valve port is opened / closed by floating of the float. A second valve port is provided below the first valve port to provide an effective pressure receiving area. Is connected to the float with the inlet and outlet fluid pressures acting in the opposite direction to the float, equal to the opening area of the first valve port, and the valve body is displaced by the floating rise and fall of the float. A float type drain trap which opens and closes a second valve port.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A float type drain trap according to the present invention is provided with a second valve port below a first valve port which is opened and closed by floating of the float, and has an effective pressure receiving area of the first valve port. The valve body on which the fluid pressure at the inlet and the outlet acts in the opposite direction to the float and is equal to the opening area of the float is connected to the float, and the second valve port is opened by the displacement of the valve body due to the floating rise and fall of the float. It opens and closes. Therefore, the fluid pressure acting on the float can be canceled by the fluid pressure acting on the valve element. Therefore, a large valve opening area can be opened and closed from low pressure to high pressure.

[0007]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). A cover 2 is fixed to the main body 1 by fastening means (not shown) such as bolts, and a case having a valve chamber 3 therein.
Form a thing. An inlet 4 is formed in the upper part of the main body 1 and communicates with the valve chamber 3 through an inflow passage 6 partitioned by a partition wall 5. A ventilation hole 7 is opened at the upper end of the partition wall 5.

A valve seat member opening 8 is opened in the main body 1, and a valve seat member 9 protruding into the valve chamber 3 is fixed by fastening means (not shown) such as bolts. Outflow passage 1 formed in valve seat member 9
An outlet 11 is formed that communicates through the zero. The first valve port 12 is opened on the upper wall of the valve seat member 9 and the second valve port 13 is opened on the lower wall. The valve chamber 3 communicates with the outlet 11 from the first valve port 12 and the second valve port 13 through the outflow passage 10. The second valve port 13 is the first
It is formed coaxially with the first valve port 12 below the valve port 12.

A float 14 is disposed above the first valve port 12 on the valve chamber 3 side, and a valve element 15 is disposed above the second valve port 13 on the outlet 11 side. The effective pressure receiving area of the valve element 15 is the first valve port 1
2 is formed to be equal to the opening area. Connecting rod 1 formed on the upper surface of valve body 15 on the lower projection formed on the lower surface of float 14
6 is screwed to connect the float 14 and the valve body 15. The float 14 and the valve body 15 are formed coaxially. A guide rod 17 is screwed to an upper projection formed on the upper surface of the float 14 and guided vertically by a support member 18 fixed to the lid 2. A guide rod 19 formed on the lower surface of the valve body 15 is vertically slid and guided by a support member 20 fixed to the valve seat member 9.

The effective pressure receiving area of the valve element 15 that opens and closes the second valve port is formed to be equal to the opening area of the first valve port 12 that opens and closes the float 14. The fluid pressure at the inlet 4 acts on the float 14 in the valve closing direction, and the fluid pressure at the outlet 11 acts on the valve opening direction. On the other hand, in the valve element 15, the fluid pressure at the inlet 4 acts in the valve opening direction, and the fluid pressure at the outlet 11 acts in the valve closing direction. Thus, the fluid pressure acting on the float 14 can be canceled by the fluid pressure acting on the valve body 15.

The operation of the above embodiment is as follows. In the state shown in the figure, the condensed water flowing from the inlet 4 into the valve chamber 3 through the inflow passage 6 is small, the float 14 descends, and the float 1
4 shows a valve-closed state in which the valve body 4 and the valve body 15 are seated on the first valve port 12 and the second valve port 13. When the liquid level of the valve chamber 3 rises due to the condensate flowing into the valve chamber 3 from the inlet 4 through the inflow passage 6, the float 14 rises with the rise of the liquid level and lifts the valve body 15 integrally. Thereby, the float 14 and the valve body 15
Is separated from the first valve port 12 and the second valve port 13, opens the first valve port 12 and the second valve port 13, and condenses the water in the valve chamber 3 to the outflow passage 1.
Discharge to outlet 11 through 0.

Since the fluid pressures acting on the float 14 and the valve body 15 are made equal in opposite directions, the first float 14 having a large opening area is used by using the same float 14 from low pressure to high pressure.
The valve port 12 and the second valve port 13 can be opened and closed. When the liquid level in the valve chamber 3 drops due to the discharge of the condensate,
The valve 14 descends and pushes down the valve body 15 integrally. As a result, the float 14 and the valve body 15 return to the valve-closed state in which the first valve port 12 and the second valve port 13 are seated.

[0013]

The present invention has the following specific effects. As described above, the float type drain trap according to the present invention is
Since the fluid pressure acting on the float can be canceled by the fluid pressure acting on the valve body, a valve port having a large opening area from low pressure to high pressure can be opened and closed.

[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 Lid 3 Valve room 4 Inlet 9 Valve seat member 11 Outlet 12 First valve port 13 Second valve port 14 Float 15 Valve element

Claims (1)

[Claims] An inlet, a valve chamber, and an outlet are formed by casing, a first valve port communicating the valve chamber with the outlet is provided, and a float is disposed in the valve chamber. The second valve port is provided below the first valve port so that the effective pressure receiving area is equal to the opening area of the first valve port.
The second valve port is opened / closed by connecting the valve body on which the fluid pressure at the inlet and the outlet acts in the opposite direction to the float, and displacing the valve body due to the floating of the float. Float type drain trap.