JPH074375Y2 - Drainage type ball valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a drainage type ball valve capable of completely discharging fluid in a valve box.

2. Description of the Related Art Conventionally, as a drainage type ball valve, for example, Japanese Utility Model Publication No. 56-37
There is a "freezing prevention ball valve" disclosed in Japanese Patent No. 019.

However, in the ball valve as described above, although the flange constituting the discharge port is formed in a downward slope, it is in the same direction as the flow path that goes straight on the plane orthogonal to the valve axis. Since it is formed in a straight line, when installing the hall valve,
When it was turned sideways, the down slope was not useful and drainage was not possible.

An object of the present invention is to provide a drainage type ball valve in which the fluid does not remain in the valve box when the ball valve is mounted normally or when it is laterally or tilted. is there.

Means for Solving the Problems In order to achieve the above object, the present invention is, in the first invention, a ball valve for switching a fluid flow path, wherein an outlet side flow path in a valve box is arranged on a plane orthogonal to a valve axis. 45 for straight flow direction
Drainage type ball valve in which the communication part communicating with the space at the lower end of the ball valve is provided at an angle of 45 ° and a downward slope of 45 ° and is equal to or less than the lowermost end of the inner diameter of the flow passage in the valve box And

In the second invention, in the ball valve for switching the fluid flow path, the outlet side flow path in the valve box is inclined by 45 degrees with respect to the direction of the flow path that goes straight on a plane orthogonal to the valve axis and is inclined by 45 degrees. A drainage type ball valve in which the end portion on the outlet side is equal to or less than the lowermost end portion of the inner diameter of the flow passage in the valve box is provided.

Function In the first aspect of the present invention, the outlet side flow passage in the valve box is provided so as to be inclined by 45 degrees and inclined downward by 45 degrees with respect to the flow passage direction which goes straight on the plane orthogonal to the valve axis. Therefore, in the normal use condition where the valve shaft is mounted vertically, it is inclined at 45 degrees and
Drainage from the outlet side with a 45 degree downward slope is performed without any problems. Also, when the valve shaft is turned sideways in relation to the mounting position of the ball valve, the outlet side also has a downwardly inclined slope due to the inclination of 45 degrees, so that drainage can be reliably performed.

The drainage that collects in the space at the lower end of the ball valve is also reliably drained through this communicating portion because the communicating portion is provided at a position equal to or less than the lowermost end of the inner diameter of the flow passage in the valve box.

In the second invention, the ball valve is of a type that does not require a valve seat on the outlet side of the ball valve, and the action thereof is the same without the need to form a communicating portion.

Embodiment Hereinafter, a drainage type ball valve according to an embodiment of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, 1 and 2 are valve boxes, 3 is a ball valve, and 4 is a valve shaft. A valve seat 5 supports and seals the ball valve 3. The fluid flow path is switched by rotating the valve shaft 4. The valve box 2 constitutes the outlet side 6 of the fluid flow passage, and extends in a 45 ° inclination direction and has a 45 ° downward slope with respect to the flow passage direction which goes straight on a plane orthogonal to the valve shaft 4. Reference numeral 7 denotes a communication portion, which communicates with the lower end portion of the ball valve 3. The lower end portion of the ball valve 3 constitutes the lowermost end portion 8 of the inner diameter of the flow passage in the valve box 1, and the communication portion 7 is arranged so as to be equal to or less than this position.

In FIG. 3, the alternate long and short dash line shows the position when the valve shaft 4 is oriented 90 degrees laterally about the straight flow passage in the valve box.

Since the outlet side 6 extends in a direction that is inclined at 45 degrees and has a downward inclination of 45 degrees with respect to the flow direction that goes straight on a plane orthogonal to the valve axis 4, the ball valve is arranged so as to be positioned vertically and laterally. Even then, the drainage has become reliable.

In FIG. 4, the outlet side of the ball valve is inclined at 45 degrees and has a 45 degree downward slope with respect to the direction of the flow path which goes straight on the plane orthogonal to the valve axis 4. Further, there is no valve seat, and the ball valve is supported at two points by the valve shafts 4 and 4a at both ends.

Effect of the Invention Since the present invention has the above-described configuration, the first invention has the inclined portion where the outlet side of the flow path is always lowered regardless of whether the ball valve is mounted vertically or horizontally. The drainage is now complete. On the outlet side of the flow passage, a communicating portion is provided at a position equal to or smaller than the lowermost end of the inner diameter of the valve box, so that the fluid accumulated at the lower end of the ball valve can be completely discharged.

Further, in the second invention, it is not necessary to provide a communicating portion from the lower end of the ball valve, and the same effect can be obtained by configuring the inner diameter of the flow passage to be the lowermost end.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is a first view.
FIG. 3 is a cross-sectional view taken along the line AA, FIG. 3 is an explanatory view showing the relationship between the inner diameter of the flow path of the valve box and the outlet side, and FIG. 4 is a cross-sectional view showing another embodiment. 1, 2 ... Valve box, 3 ... Ball valve 4,4a ... Valve shaft, 6 ... Outlet side, 7 ... Communication part 8 ... Lower end of inner diameter of flow passage

Claims (2)

[Scope of utility model registration request] 1. A ball valve for switching a fluid flow path, wherein an outlet-side flow path in a valve box is inclined at 45 degrees with respect to a flow path direction which goes straight on a plane orthogonal to a valve axis and has a 45 degree downward slope. A drainage type ball valve, characterized in that the communicating portion communicating with the space at the lower end of the ball valve is provided at a position equal to or less than the lowermost end of the inner diameter of the flow passage in the valve box. 2. A ball valve for switching a fluid flow path, wherein an outlet-side flow path in a valve box is inclined by 45 degrees with respect to a flow path direction which goes straight on a plane orthogonal to a valve axis and is inclined by 45 degrees. A drainage type ball valve, wherein the outlet side end is provided at a position equal to or less than the lowermost end of the inner diameter of the flow passage in the valve box.