JPS5927575Y2 - Valve structure of butterfly type water control valve - Google Patents

Description

[Detailed description of the invention] The present invention is a butterfly type water control valve, and in particular, the circular valve body is installed in a valve box so as to be rotatable around a valve shaft eccentrically supported on the circular valve body. This invention relates to a valve structure in a butterfly type water control valve.

Conventionally, a typical valve structure of a butterfly type water control valve is shown in FIG.

To explain this conventional technology, a holding plate is screwed into the valve body and fixed so as to sandwich the valve seat A, and the circular valve body A is moved around the valve shaft pivoted on the circular valve body A. By rotating within the box, the butterfly valve can be opened and closed.

However, when water is shut off when handling high-pressure fluid, even though the valve body A is in contact with the valve seat I on the inner periphery of the valve box, there is a problem in that leakage occurs from the gap between the valve body A and the valve seat I.

It can be understood that the leak is caused by the high water pressure bending one relatively soft valve seat.

Further, although it is possible to prevent leakage against a fairly strong fluid pressure when fluid flows from one direction, it is difficult to completely prevent leakage from one side.

Therefore, the technical problem of this invention is to utilize the relatively soft nature of the valve seat to press the local part of the valve seat against the local part of the valve body using high water pressure, to prevent water leakage, and to prevent water from leaking in either direction. It may be possible to completely prevent water leakage even if a strong fluid flows in from the inside.

In order to achieve the above technical problem, the present invention adopts the following configuration.

That is, a butterfly-type water control valve is constructed by installing a disc-shaped valve body A rotatably within a cylindrical valve box C around a valve shaft 1 eccentrically supported on the disc-shaped valve body A. , a ring-shaped 7 flange 9 having a narrower width than the ring-shaped valve seat B is formed on the outer periphery of the ring-shaped valve seat B having the seat surface 3 on the inner circumferential surface, and the flange 9 is formed on the inner circumferential surface of the valve box C. Fit and fix in the recess to be formed,
Two inner circumferential surfaces 1 in the valve box C bordered by the recessed part of the valve box C.
3.13 and the two outer circumferential surfaces 3/, 3/ of the valve seat B with the flange 9 of the valve seat B as a border, and a gap is provided between the pair of contact surfaces, and the surrounding seating surface of the valve body A is further provided. An annular concave groove 4a
, 4b are provided to define three annular seating surfaces 2a, 2b, and 2c, and the width of the seven flange 9 of the valve seat B is approximately the same as the width of the seating surface 2b located at the center of the three seating surfaces. The inner surface 3 of the seat B is installed so that it can be joined to the three seat surfaces 2 a , 2 b , and 2 c of the valve body A at the same time, and the valve seat B is formed to be soft.

The present invention, which adopts the above technical means, is capable of handling high-pressure fluid when the water is stopped, and when the high-pressure fluid flows in, the valve box C on the high-pressure side
High-pressure fluid enters the gap between the contact surfaces formed by the inner circumferential surface 13 of the valve body B and the outer circumferential surface 3' of the valve seat B, and pushes up the soft outer circumferential surface 3' of the valve seat B, for example, the annular seat surface of the valve body A. Seat surface 3 of the valve seat on 2a
Press strongly.

In other words, the valve body A has concave grooves 4a and 4b and three seat surfaces 2a,
2b and 2c are defined, and the respective seat surfaces protrude, and are press-fitted so as to partially sink into the seat surface 3 of the soft valve seat B that is pressed, thereby establishing a strong sealing relationship.

On the other hand, when the valve body A and the valve seat B come into contact with each other, the concave grooves 4a and 4b of the valve body A function as a labyrinth and help improve sealing performance.

Furthermore, even if high-pressure fluid flows in from the opposite direction, the structure of the inner circumferential surface 13 of the valve box C and the outer circumferential surface 3' of the valve seat B is similar to that described above, and the same sealing effect can be achieved.

Next, the embodiment shown in the drawings will be described.

Fig. 1 shows a front view of a butterfly-type water control valve, in which a stepped portion 5 is formed along the inner circumference on the side of the cylindrical valve box C, and a female thread 6 with a large diameter in the axial direction is formed on the outer side of the stepped portion 5. A ring-shaped valve is formed on the side of the valve box C by screwing a male screw T into the female screw 6 and attaching a presser plate 8 to the ring-shaped valve having a seat surface 3 of a constant width inclined in the axial direction on the inner circumferential surface. A flange 9 of a constant width is formed on the outer periphery of the seat B, and both grooves 10 and 10 are formed on both sides of the flange 9, and the flange 9 is fitted between the stepped portion 5 and the holding plate 80. A watertight adhesive is applied to the joint surfaces 11 and 12 between both side surfaces of the flange 9, the side surfaces of the stepped portion 5, and the side surfaces of the holding plate 8. The valve seat B is mounted so that there is a slight gap between the contact surfaces 3' and 3' of the valve seat B, and the valve seat B is made of a soft, non-rusting metal.

A vertical valve shaft 1 is fitted into a boss 14 integrally formed at the center of a side surface of a circular valve body A fitted in a valve box C, and a key 1 is inserted into the boss 14.
5, the lower part of the valve shaft 1 is mounted on the bearing part 16 at the lower part of the valve case C, and the upper part of the valve shaft 1 is extended to the operation box 1T at the upper part of the valve case C, and is connected to the upper operation shaft 18. Although the valve stem 1 is installed so that it can be rotated, the center of the valve stem 1 is slightly shifted from the center of the valve body C, and the valve stem 1 is moved to the valve body A.
It is installed and configured so that it is eccentric to the main body.

The valve body A has the boss 14 fixedly attached to the side surface thereof.
At the center of the outer periphery, a protruding part 19 of a constant width having a seat surface 2b inclined in the axial direction is formed on the outer periphery, and male threads 20 are provided on both outer peripheries of the valve body a on both sides of the lower part of the protruding part 19.
20 respectively, and seat surfaces 2 inclined in the axial direction on the outer periphery.
On the inner periphery of both ring bodies 21, 220 having a constant width and having diameters 21 and 2c, there is a female thread 23. which can be screwed into the male thread 20, 20.
23 are formed respectively, and both grooves 24 and 24 are respectively formed on the inner surfaces of both ring bodies 21 and 22 to form a joint between the inner surfaces of both ring bodies 21 and 22 screwed together and both sides of the protrusion 190. A water-tight adhesive is applied to the surfaces 25*26, and the seat surface 2
Between a and 2b and between the seating surfaces 2b and 20, narrow concave grooves 4a and 4b are formed over the entire circumference, and each seating surface 2at2bt2c is connected and sloped so as to correspond to the seating surface 3 of the valve seat B. Both ring bodies 21 and 22 are formed so that
The valve body a is made of a non-rusting metal that is harder than the valve seat B, and is made of a material having a different hardness.

Therefore, when water is cut off, the valve body A is rotated by the valve shaft 1, and as shown in FIGS. When the valve body A is joined, the valve body A can be closed to shut off water, but in this state, when high water pressure fluid flows in, the inner circumferential surface 13 of the valve body C on the high pressure side and the outer circumferential surface 3 of the valve seat B High-pressure fluid enters the gap between the contact surfaces formed by the valve seat B, pushes up the soft outer circumferential surface 3' of the valve seat B, and strongly presses the seat surface 3 of the valve seat against the annular seat surface 2a of the valve body A, for example.

That is, the valve body A has a concave groove portion 4a. 4b and three seat surfaces 2a, 2
B and 2c are defined, and the respective seat surfaces protrude and are press-fitted so as to partially sink into the seat surface 3 of the soft valve seat B that is pressed, thereby establishing a strong sealing relationship.

On the other hand, when the valve body A and the valve seat B are in contact with each other, the concave grooves 4a and 4b of the valve body A function as a labyrinth and help improve sealing performance.

Furthermore, even if high-pressure fluid flows in from the opposite direction, the structure of the inner circumferential surface 13 of the valve body C and the outer circumferential surface 3' of the valve seat B is similar to that described above, and the same sealing effect is achieved, and the valve body side Since the hardness of the valve seat side is different from that of the valve seat side, wear and damage can be prevented, and the structure has a simple structure that can be suitably implemented.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front view of the water control valve, Fig. 2 is a plan view of the valve body, Fig. 3 is a sectional view of the main parts, and Fig. 4
The figure is an exploded view of the valve body in Figure 3, Figure 5 is a cross-sectional view of a part of Figure 3, Figure 6 is an exploded explanatory diagram of Figure 5, and Figure 1 is an exploded view of the valve body in Figure 3. It is a partially enlarged sectional view of the valve structure in a water control valve. A... Valve body, 1... Valve stem, B...-
... Valve seat, C ... Valve box, 3 ... Seat surface,
2a) 2b32c...Seating surface, 4a, 4b...
... Groove.

Claims (1)

[Scope of Claim for Utility Model Registration] A disk-shaped valve body A is rotatably mounted in a cylindrical valve body C around a valve shaft 1 eccentrically supported on the disk-shaped valve body A. In the butterfly-type water control valve, a ring-shaped 7 flange 9 having a width smaller than that of the ring-shaped valve seat B is protruded on the outer periphery of a ring-shaped valve seat B having a seat surface 3 on the inner peripheral surface, and the flange 9 is formed into a valve shape. It is fitted and fixed in a recess formed on the inner circumferential surface of the box C, and the two inner circumferential surfaces 13. A gap is provided between the pair of abutting surfaces formed by the two outer circumferential surfaces 3' and 3' of the valve seat B, and an annular concave groove 4 a y is provided in the surrounding seat surface of the valve body A.
4b are provided to form an annular three-seat surface 2a, 2b. 2c, and assuming that the width of the flange 90 of the valve seat B and the width of the seat surface 2b located at the center of the three seat surfaces are approximately the same, the inner surface 3 of the valve seat B is the three seat surface 2a t 2 b t2c of the valve body A. A valve structure in a butterfly type water control valve, characterized in that the valve seat B is formed to be soft and installed so that they can be joined at the same time.