JPS5942536Y2 - valve - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a simple valve.

There are various types of simple valve structures, but those in which a pipe joint can be used as a valve box, and those in which the ends of connected pipes can be used are particularly useful.

There have been cases where the tip end of a pipe has been used as a valve seat, but in normal piping work, the end face of the pipe is not finished flat, so it is necessary to completely seal off the internal fluid. was impossible.

Also, it was used as a device to seal the fluid on the inner peripheral surface of the pipe.
As disclosed in Publication No. 6074, there was a seal packing that was suppressed from expanding in the outer peripheral direction by the pressure of the fluid and self-sealed by the fluid itself, but when the pressure of the fluid was low, the pressing force for expanding the seal packing The problem was that it did not work and the fluid could not be completely sealed.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and provide a valve that can be completely sealed even if the valve seat surface has a rough finish, such as the end surface of a pipe, and even if the fluid pressure is low.

The gist of the present invention is that the valve body is a four-ring ring with an edge that engages with the valve seat surface, the outer surface is close to the inner circumferential surface of the valve seat, and the inner bottom surface is formed in an upward arc shape. It consists of an elastic member in which the lower end of the valve stem is loosely fitted into a concave ring, and by locking the edge to the valve seat surface and pressing the inner bottom surface of the concave ring with the valve stem, the outer surface of the concave ring is expanded in diameter. The present invention is a valve that presses and closes a valve body against a valve seat surface and a valve seat inner surface, and will be described below based on embodiments.

FIG. 1 shows an embodiment of the present invention.

Using the T of the pipe joint as the valve box 1, the valve body 2 made of an elastic member such as rubber is inserted from one end into the tip 4 of the valve stem 3 and loosely fitted, and a screw 6 is attached to the lower end on the vertical axis of the valve box. The valve body is brought into contact with the end of the pipe 5 connected by the valve body.

The figure shows that the lower end of the valve stem 3 presses the lower surface of the concave portion of the valve body 2, and the lower surface of the edge 7, which is enlarged into a disk shape, is locked to the portion of the end surface 8 of the pipe 5 that corresponds to the valve seat. Furthermore, the diameter of the concave lower outer circumferential portion 9 of the valve body 2 is expanded and inscribed in a portion of the inner surface 10 of the pipe 5 corresponding to the inner circumferential surface of the valve seat, thereby doubling the internal fluid between the valve seat and the inner circumferential surface of the valve seat. Shows the sealed state.

The lid 11 supports the valve stem 3, and has a structure in which the valve stem 3 is moved up and down by rotating a handle wheel 13 provided at the upper end of the valve stem. The valve stem 3 is sealed.

FIG. 2 is an enlarged sectional view of the main part of FIG. 1, and shows that the lower surface of the enlarged disc-shaped edge γ of the valve body 2 is engaged with a portion of the end surface 8 of the pipe 5 corresponding to the valve seat. , shows a state before the concave lower outer peripheral portion 9 of the valve body 2 is inscribed in a portion of the inner surface 10 of the pipe 5 corresponding to the inner peripheral surface of the valve seat.

As shown in the figure, the original shape of the valve body 2 consists of an edge I that engages with the valve seat end surface 8 of the tube 5, a bottom portion 15 that is concave in cross section and whose inner lower surface is arched upward, and the inner diameter of the tube 5 and the gap 14. It consists of a cylindrical part 9 to be formed.

Note that the lower surface of the bottom portion 15 may have an arc shape as shown in FIG.
It cannot be used even if it is flat as shown in the figure.

Further, the upper part of the concave cross section of the valve body 2 is narrowed so as not to separate from the tip 4 of the valve stem 3.

When the valve stem 3 is further pushed down by rotating the handle 13 from this state, the outer surface shape 16 of the bottom portion 15 and the circumferential portion 9 of the valve body 2 remains fixed at the edge 1 as shown by the two-dot chain line 17. The circumferential portion 9 is expanded in diameter and inscribed in the inner diameter surface 10 of the tube 5 as shown in FIG.

In this manner, the edge I of the valve body 2 engages with the tube end 8, and the enlarged circumferential portion 9 presses against the inner surface of the tube to seal it.

Therefore, the flat inner diameter surface, which is not affected by cutting or the like of the tube, can be used as a sealing surface, and leakage of internal fluid can be completely prevented.

FIG. 3 shows another embodiment, in which a valve body 2a is attached to a valve stem 3a via a valve body support 18.

Note that the valve is in an open state. The valve body 2a has substantially the same shape as the valve body 2 of the first embodiment, and is inserted into the mounting screw 19 of the valve body support 18 and secured by a nut 19a.

The support 18 is provided with an edge 21, and a gap 22 is provided between the edge 21 and the edge 7a of the valve body.

This gap is for regulating the amount of tightening deformation of the valve body 2.

23 is the upper end of the support 18, which is caulked after loosely fitting the tip of the valve stem 3.

As explained above, in the valve of the present invention, the valve seat surface and the inner circumferential surface of the valve seat are aligned by pressing the integrally formed valve body with the valve stem.
It can be closed by double pressing with one valve body.

Therefore, even if the surface finish of the valve seat surface or the inner peripheral surface of the valve seat is rough, it can be completely sealed without being affected by the fluid pressure.
Valve stems and valve seats can be easily manufactured using general steel pipes and pipe fittings without the need for complex machining or precise finishing accuracy, making it an excellent product that can provide safe valves even with a small number of component parts. It has the following effects.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of the valve structure according to the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is a longitudinal sectional view showing another embodiment. 1: Valve box, 2: Valve body, 3: Valve stem, 7: Edge, 9: Circumference, 15: Bottom, 18: Valve body support.

Claims (1)

[Scope of utility model registration request] A valve stem is attached to the upper end of the valve box through a lid, and the valve stem inside the valve box moves up and down by the rotation of a handle provided at the top of the valve stem, and is attached to the lower end of the valve stem. In a valve that opens and closes a valve using a valve body and a valve seat at the bottom of the valve body, the valve body is a concave ring having an edge on the upper outer periphery that engages with the valve seat surface, and the outer surface of the concave ring is The bar is close to the inner circumferential surface of the valve seat, has an upwardly arched inner lower surface, and is made of an elastic member in which the lower end of the valve rod is loosely fitted into the concave ring, and the edge portion is connected to the valve seat. By engaging the valve stem and pressing the inner bottom surface of the concave ring with the valve stem, the outer surface of the concave ring is expanded in diameter and the valve body is brought into contact with the valve seat surface and the inner circumferential surface of the valve seat. A valve characterized by suppressing closure.