JPH0117732Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to an improvement of a soft seat valve that opens and closes a flow path using a valve body fitted with a soft seat. This aims to improve the sealing performance of a relatively small soft seat valve when the valve is closed.

[Conventional technology]

Conventionally, as shown in FIG. 2, a disk 2 is formed at the tip of a rod 1, and a soft sheet 5 made of a rubber-like elastic material is fitted into a recess 3 at the tip of the disk 2 and fixed with a bolt 4. Valve body 6 consisting of
and a valve box 9 having a flow path 7 and a valve seat 8 protruding from the opening periphery of the flow path 7, and the valve body 6 moves forward and backward by the operation of the rod 1.
The soft seat 5 of the valve body 6 opens and closes the flow path 7 in close contact with and apart from the valve seat 8 of the valve box 9;
Soft seat valves that control the flow of fluid in the flow path 7 are widely known.

[Problem that the invention attempts to solve]

However, in the above-mentioned conventional soft seat valve, even though the load applied to the valve body 6 is relatively small when the valve is closed, the close contact area between the front surface 5a of the soft seat 5 and the valve seat 8 is used for sealing. However, since the contact area between the rear surface 5b of the soft seat 5 and the concave portion 3 of the disk 2 is flat, the load upon closing the valve is small as described above. In this case, it is not always possible to obtain sufficient sealing surface pressure, and if there is a part where the contact part has poor processing precision or poor fitting, there is a problem that leakage is likely to occur from that part.

In view of these problems, the present invention improves the sealing performance by increasing the contact pressure between the soft seat and the disk when the valve is closed to the same level as the contact pressure between the soft seat and the valve seat. This was done to achieve this goal.

[Means for solving problems]

In order to achieve the above object, the soft seat valve of the present invention has a protrusion formed in the concave portion of the disk into which the soft seat is fitted, at a position facing the valve seat that protrudes from the flow path opening of the valve box. , so that the rear surface of the soft sheet is supported by the protrusion.

[Effect]

Therefore, when the valve is closed, the valve seat not only comes into pressure contact with the front surface of the soft seat fitted into the concave portion of the disk, but also maintains pressure similar to that of the contact surface pressure between the soft seat and the valve seat. The protrusion formed in the concave portion comes into pressure contact with the rear surface of the soft seat with surface pressure, that is, the soft seat is pressed by the valve seat and the protrusion located at mutually opposing positions.
Even if the load applied to the valve body during valve closing is relatively small, sufficient surface pressure necessary for sealing can be obtained.

〔Example〕

Next, a preferred embodiment of the soft seat valve of the present invention will be described with reference to FIG.

In the figure, the parts having the same configuration as the conventional example shown in FIG.
3 is a concave portion; 4 is a bolt for fixing a soft seat 5 made of a rubber-like elastic material to the concave portion 3; the disk 2 and the soft seat 5 together constitute a valve body 6; On the other hand, 7 is the valve box 9
A flow path 8 formed in the flow path 7 is a valve seat protruding from the periphery of the opening of the flow path 7 .

In this embodiment, a valve seat 8 on the valve box 9 side in the concave portion 3 of the disk 2 is used.
At a position opposite to the valve seat 8, a protruding ridge 10 having an end face shape substantially the same as that of the end face of the valve seat 8 and supporting the rear back surface 5b of the soft seat 5 is provided, and the recessed portion 3. An annular retainer 12 for supporting and fixing the soft sheet 5 at the same height as the end surface of the protrusion 10 is protruded from the periphery of the opening of the bolt screw hole 11 drilled in the center of the soft sheet 5. ing. That is, this embodiment is configured such that when the valve is closed, the soft seat 5 is pressed between the valve seat 8 that projects toward the valve box 9 side and the protrusion 10 that projects toward the disk 2 side. Even if the load applied to the valve body 6 to close the valve is relatively small, the rear surface 5b of the soft seat 5 and the protrusion 10 are in close contact with the front surface 5a of the soft seat 5.
As with the close contact portion of the valve seat 8, the surface pressure locally becomes large, and the sealing surface pressure is sufficient to achieve pressure contact.

In this embodiment, the end face shape of the protrusion 10 is configured to be approximately the same as the end face shape of the valve seat 8, but it goes without saying that this is not limiting and other shapes may be used. .

[Effect of idea]

As described above, the soft seat valve of the present invention has a protrusion protruding from the concave portion of the disc constituting the valve body at a position facing the valve seat, and when the valve is closed, the protrusion and the valve seat It is constructed so that the soft seat on the valve body side is clamped, and its structure is very simple, and it has a remarkable effect of improving sealing performance, especially in soft seat valves where the load for closing the valve is small.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a preferred embodiment of the soft seat valve of the present invention, and FIG. 2 is a sectional view showing a conventional example. 2...Disc, 3...Concave portion, 5...Soft seat, 6...Valve body, 7...Flow path, 8...Valve seat, 9...Valve box, 10...Protrusion.

Claims (1)

[Scope of utility model registration request] A valve body comprising a soft seat made of a rubber-like elastic material fitted into a concave portion of a disk, and a valve seat having a flow path and a rim-shaped valve seat formed at the opening of the flow path. and a valve box, and the soft seat comes into close contact with and separates from the valve seat by moving the valve body back and forth to open and close the flow path, thereby controlling the flow of fluid in the flow path. In this method, a protrusion is formed at a position opposite to the valve seat in the concave portion of the disk, and the protrusion supports the rear surface of the soft seat fitted in the concave portion. Soft seat valve.