JPH0743558Y2 - Check valve that doubles as an on-off valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a check valve that also serves as an on-off valve.

[Conventional technology]

Generally, when adjusting the flow rate and the flow direction of a fluid in a pipeline, an opening / closing valve is provided for the former and a check valve for the latter.

Further, as a valve that serves both of these, for example, Japanese Patent Laid-Open No.
Fluid valves such as those disclosed in -147171 are known.

[Problems of conventional technology]

However, in the above-mentioned conventional technology, it is provided that the on-off valve and the check valve are connected to each other so that each valve complicates the flow path of the internal fluid, and, for example, in a spherical valve, the flow path is almost right On the other hand, in the check valve, since the shut-off valve element is always suspended in the fluid,
Both of them had a problem that the fluid resistance became considerable and the flow efficiency was deteriorated.

On the other hand, the latter fluid valve, which is also a check valve that doubles as an on-off valve,
It is thought that there is less problem that the efficiency of the flow decreases as the former, but in the steady flow, the spherical valve that performs the check blocks most of the flow passage cross section and stands still against the fluid pressure. There was a problem in that the efficiency was significantly reduced, and it did not contribute to the reduction in resistance.

In addition, there is also a drawback in that the mounting direction is generally determined with respect to the upstream and downstream directions of the check valve pipe, and that the direction must be taken care when laying.

[Problems to be solved by the device]

In view of the above-mentioned problems, the present invention can reduce the flow efficiency as much as possible, can surely shut off when a backflow occurs, and can be opened and closed with one valve, and after installation, Another object of the present invention is to provide a check valve that doubles as an open / close valve whose check direction can be easily deflected.

[Technology that has solved the problem]

That is, the check valve also functioning as an on-off valve according to the present invention has an on-off valve body housed in a valve box such that the inner surface and the outer peripheral surface of the valve box are in close contact with each other and rotatable about a vertical axis. A through hole, which is capable of communicating with a pipe connected to the box and which is orthogonal to the vertical axis, is bored, and a branch hole having a larger diameter than the through hole is branched from the through hole in an obliquely upward direction. Along with that, the cross section of the flow hole at the branch starting point of the branch hole is circular, and a spherical check valve having a larger diameter than the flow hole is movably received in the branch hole. To do.

〔Example〕

 Next, an embodiment of this invention will be described.

1 is a sectional view of an embodiment of the present invention, FIG. 2 is a sectional view of another embodiment, FIG. 3 is a sectional view of yet another embodiment, and FIG.
The figure is a plan view of the embodiment.

The check valve 1 also functioning as an on-off valve of the present invention has a valve box 2 in which a valve box inner surface 2A and an outer peripheral surface 3A are in close contact with each other and a rotatable on-off valve body 3 is housed around a vertical axis NN. In FIG. 3, a pipe P connected to the valve box 2 and a flow hole 4 that can communicate with the pipe P are provided on the vertical axis N−.
A branch hole 5 having a diameter larger than that of the through hole 4 is formed so as to be orthogonal to the N and communicates obliquely upward to branch, and the cross-sectional shape S of the through hole 4 at the branch starting point of the branch hole 5 is circular. In addition, a spherical check valve 6 having a larger diameter than the flow hole 4 is movably received in the branch hole 5.

In the above embodiment, the on-off valve body 3 is a rotating body such as a sphere (Figs. 1 and 2) or a cylindrical body (Fig. 3) having a vertical axis N-N as an axis.

Further, the communication state of the branch hole 5 with the flow hole 4 may be such that the cross section S of the communication hole 4 at the branch start point of the branch hole 5 has a circular shape, and as long as this is the case, at the branch start point of the communication hole 4 and the branch hole 5. The positional relationship between the two may be either eccentric or concentric.

The communicating portion between the branch hole 5 and the communicating hole 4 may be provided in a state of being extended (L) along the communicating hole 4 as shown in FIG.

Reference numeral 7 in the drawing denotes a rotation operation handle of the opening / closing valve body 3.
Further, it is desirable to display an arrow 7A indicating the direction of the forward flow direction on the handle 7 as shown in FIG.

[Action]

In this invention, when the flow is in the forward direction (arrow X), the spherical check valve body 6 arranged inside as shown in FIGS. 1 to 3 is pushed by the flow force and moves to the downstream side. However, since the check valve body 6 is movable only in the large-diameter branch hole, it is pushed up to the large-diameter branch hole 5 that is branched obliquely upward from the flow hole 4.

Therefore, the flow hole 4 is not blocked by the spherical check valve body 6, and the fluid flows efficiently.

Further, when a reverse flow occurs in the pipe P, the force pushing up the check valve 6 of the sphere disappears, so that the check valve body 6 of the sphere has the branch hole 5 as shown by the solid line in FIGS. 1 to 3. To the distribution hole 4. At this time, since the cross-sectional shape of the flow hole 4 at the branch starting point of the branch hole 5 is circular, the spherical check valve body 6 fits into the circular cross section S without a gap and closes the flow hole 4, thus preventing backflow. To be done.

Further, when the opening / closing adjustment of the flow path is performed, the handle 7 is operated to rotate the opening / closing valve body 2 as shown in FIG. 3 to reduce the projected opening area of the valve box 2 with respect to the openings 2P and 2P to reduce the flow rate. adjust.

Further, if the handle 8 is rotated 180 °, the check direction can be reversed.

〔effect〕

As described above, according to the present invention, the forward flow of the fluid can be obtained without narrowing the effective sectional area of the flow path, and the check can be surely performed. Furthermore, the rotation of the opening / closing valve body allows the flow rate adjustment and the check The direction can be switched, and the valve mounting work at the time of laying the pipe is facilitated, which has various practical effects.

[Brief description of drawings]

1 is a sectional view of an embodiment of the present invention, FIG. 2 is a sectional view of another embodiment, and FIG. 3 is a sectional view showing still another embodiment.
FIG. 4 is a plan view of the embodiment.

Claims (1)

[Scope of utility model registration request] 1. An on-off valve body is housed in a valve box such that an inner surface and an outer peripheral surface of the valve box are in close contact with each other so as to be rotatable around a vertical axis, and the on-off valve element can communicate with a pipe connected to the valve box. It should be noted that a through hole perpendicular to the vertical axis is bored, a branch hole having a larger diameter than the through hole is branched from the through hole in a diagonally upward direction, and a branch starting point of the branch hole is formed. A non-return valve that doubles as an on-off valve, characterized in that the flow hole has a circular cross section, and a spherical check valve having a larger diameter than the flow hole is movably received in the branch hole.