JPH0741998Y2 - Free float valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention utilizes the difference in specific gravity between gas and liquid to directly open and close the valve hole with an open or closed free float accommodated in the valve chamber in a free state. The present invention relates to a free float valve that selectively and automatically discharges one fluid from a gas-liquid mixing system, and more particularly to a free float valve that can increase the discharge flow rate.

The free float valve is used as a drain trap that automatically discharges steam, compressed air, or a drain generated in a gas piping system, an air vent that automatically discharges air mixed in a water piping system, and the like.

In a conventional free float valve, a valve casing forms an inlet, a valve chamber, and an outlet, and a valve seat that communicates the valve chamber and the outlet is formed by protruding a valve seat into the valve chamber to form a free state in the valve chamber. The valve hole is directly opened and closed by the accommodated float, and the valve chamber side end of the valve hole formed in the valve seat is normally formed at a right angle. In this case, when the discharged fluid flows into the valve hole, a contraction occurs, which causes a problem that the discharged flow rate decreases.

<Prior Art> Therefore, as disclosed in Japanese Utility Model Laid-Open No. 61-64573,
If the valve chamber side opening end of the valve hole formed in the valve seat is R-processed and widened, a contraction flow does not occur and the discharge flow rate can be increased.

<Problems to be solved by the present invention> However, in the above-mentioned one, since the valve chamber side end of the valve hole is widened, the seal diameter at the time of sitting and closing the float becomes large. That is, the valve closing force increases. Therefore, there is a disadvantage that the valve opening force must be increased by increasing the float.

Therefore, the technical problem of the present invention is to increase the discharge flow rate without increasing the seal diameter.

<Means for Solving the Problems> The technical means of the present invention taken to solve the above technical problems is to form an inlet, a valve chamber, and an outlet with a valve casing,
Attach a valve seat with a valve hole that connects the valve chamber and the outlet to the valve casing, and form a protruding cylindrical portion at the valve chamber side end of the valve hole of the valve seat. A float with a seal part that opens and closes on the outer surface is accommodated in the valve chamber in a free state, and an annular member with the inner diameter of the tip widened toward the tip is arranged on the outer periphery of the cylindrical portion, and the tip of the annular member is positioned more than the cylindrical portion. The annular member is biased by a spring so as to project.

<Operation> The operation of the above technical means is as follows.

As the amount of fluid to be discharged increases, the float moves away from the cylindrical portion of the valve seat to open the valve hole. The tip of the annular member arranged on the outer periphery of the cylindrical portion is made to project beyond the cylindrical portion by the biasing force of the spring, and the hole with the widened tip is located at the tip of the valve hole of the cylindrical portion. Since the discharged fluid flows into the valve hole from the widened hole of the annular member, it is discharged to the outlet without contraction. When the discharge is completed, the float first comes into contact with the annular member, and while being displaced against the biasing force of the spring, the float is seated on the cylindrical portion and closes the valve hole. Since the float seals the cylindrical portion, the seal diameter does not increase.

<Example> An example showing a specific example of the above technical means will be described (see FIGS. 1 and 2).

The present embodiment is applied to a free float type drain trap that automatically discharges the drain generated in the steam piping system.

A lid 2 is fastened to the main body 1 with a belt 3 to form a valve casing having a valve chamber 4 inside. A gasket 5 is interposed between the main body 1 and the lid 2 to keep them airtight.

An inlet 6 is formed in the upper part of the body 1 and an outlet 7 is formed in the lower part. The inlet 6 and the outlet 7 are opened in the horizontal direction, and each form an internal thread for piping. The inlet 6 is a small hole 20,2 in the upper part of the valve chamber 4.
The drain is introduced into the valve chamber 4 by communicating with each other through 1 and connecting to a device using steam (not shown) or the like.

A valve seat 11 having a valve hole 10 in the lower part of the main body 1 is screwed via a gasket 12. The valve hole 10 communicates the valve chamber 4 and the outlet 7, and guides the condensed water of the valve chamber 4 to the outlet 7. Valve seat 11 valve hole 10
A cylindrical portion 13 is formed at the end of the valve chamber 4 on the side thereof, and an annular member 14 is urged by a spring 15 on the outer periphery of the cylindrical portion 13. The annular member 14 is processed by expanding the inner diameter of its tip into an R shape (reference numeral 16).

A hollow spherical float 8 made of a stainless steel thin plate is accommodated in the valve chamber 4 in a free state. The float 8 floats on the drain accumulated in the valve chamber 4 and ascends and descends together with the liquid surface.

When the float 8 floats, the annular member 14 is urged by a spring 15 so as to protrude from the tip of the cylindrical portion 13 as shown by the solid line in FIG. Located at the tip of 13. When the float 8 descends and sits on the cylindrical portion 13, the float 8 retracts to the position shown by the dotted line in FIG.

The float seat 17 is provided on the bottom surface of the valve chamber 4 substantially parallel to the axis of the valve hole 10.
2 are formed in total on the front side of the paper surface to hold the float 8 when the valve is closed.

Reference numeral 18 is a bimetal piece, which is attached to the main body 1 with screws 19 and 20, deforms at a low temperature to separate the float 8 from the valve seat 11, open the valve hole 10, and contract at a high temperature (see FIG. 1). (State shown) The float 8 is no longer involved.

The operation of the steam trap is as follows. Entrance 6
Is connected to the place where drainage occurs such as steam-using equipment. The drain and the steam flow into the valve chamber 4, and the drain is separated into the lower part and the steam is separated into the upper part and accumulated. The float 8 floats up due to the drain and the valve hole
Open 10 At this time, the annular member 14 is biased by the spring 15 to be in the state shown by the solid line in FIG. When the liquid surface drops due to the discharge, the float 8 descends, and the annular member 14 is displaced against the spring 15 to the position shown by the dotted line in FIG.
Sit at the tip of the valve to close the valve hole 10 and stop drain outflow.

In addition, in the present embodiment, the inner diameter of the tip of the annular member 14 is processed into an R shape, but the present invention is not limited to this.
The tip may be widened by processing it into a taper shape. That is, it should be widened so that no contraction occurs.

<Effect of Invention> The present invention has the following unique effects.

As described above, according to the present invention, the discharge flow rate can be increased without increasing the seal diameter. Therefore, the float and the valve casing can be made small.

When the float is seated on the cylindrical portion of the valve seat, it first comes into contact with the annular member urged by the spring, so that the collision force at the time of seating is absorbed by the spring. Therefore, the float is less likely to be scratched or dented.

Since the biasing force of the spring acts as the valve opening force on the float when the valve is closed, the float can be opened even if the diameter of the valve hole is increased. Therefore, this also makes it possible to increase the discharge flow rate.

[Brief description of drawings]

FIG. 1 is a sectional view of a free float type drain trap according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a valve seat portion of FIG. 1: Main body, 2: Lid 4: Valve chamber, 6: Inlet 7: Outlet, 8: Float 10: Valve hole, 11: Valve seat 13: Cylindrical part, 14: Annular member 15: Spring, 16: R-shaped processing part

Claims (1)

[Scope of utility model registration request] 1. A valve seat having a valve casing having an inlet, a valve chamber and an outlet formed therein, and a valve hole communicating with the valve chamber and the outlet, is attached to the valve casing, and the valve seat protrudes at a valve chamber side end of the valve hole. An annular member in which a float is formed in the valve chamber in a free state by forming a stiff cylinder part and having a seal part on the outer surface which is seated on the cylinder part to open and close the valve hole. Is a free float valve in which the annular member is arranged on the outer periphery of the cylindrical portion, and the annular member is urged by a spring so that the tip of the annular member projects beyond the cylindrical portion.