JPS6210536Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a valve seat that is easy to manufacture.

When installing a valve seat into a valve seat mounting hole, a structure is used in which both ends of the valve seat are engaged with the valve seat mounting hole, and as shown in Fig. 5, the conventional valve seat 1 has one end A cylindrical body 4 having a flange 2 on its outer circumferential surface and a protrusion 3 on its inner circumferential surface at the other end.
It consists of a valve seat 1 and its installation is
Attach the flange of the valve seat to the flange 2 seat of the mounting hole, and bend the protrusion 3 provided around the inner peripheral surface of the cylinder 4 outward to the tapered surface of the lower end of the valve seat mounting hole. In the manufacturing process, thick-walled pipes were cut to appropriate dimensions and then processed.

However, since this valve seat 1 has a flange 2 formed on the outer circumferential surface of the wall of the cylinder 4 and a protrusion 3 on the inner circumferential surface, the distance from the tip of the flange 2 to the tip of the protrusion 3 is A is extremely large, so when manufacturing this valve seat, an extremely thick walled tube must be used, and the outer and inner peripheral surfaces of the cylinder body 4 must be processed. This has the disadvantage that the processing process is complicated.

The purpose of the present invention is to provide a valve seat that is easy to manufacture in order to eliminate this drawback, and the structure is such that a flange is provided at one end of the outer peripheral surface of a cylindrical body that fits into the valve seat mounting hole. This valve seat is characterized in that a protrusion protruding outward from the outer circumferential surface of a cylinder is provided around the other end thereof.

Embodiments of the present invention will be described below based on the drawings.

As shown in FIGS. 1 to 4, the valve seat 11 is made of a cylindrical body 11a, and a flange 12 is provided at the upper end of the outer circumferential surface facing outward, and a flange 12 is provided at the lower end of the outer circumferential surface. Similarly, an endless protrusion 13 facing outward is provided around the outer peripheral surface. Further, the tip end surface of the endless protrusion 13 is reduced in diameter downward, thereby forming the tapered surface 1.
Further, a tapered surface 15 whose diameter decreases downward is formed on the inner peripheral surface of the upper end of the cylindrical body 11a.

Next, a method for attaching the valve seat according to the present invention to the valve seat attachment hole will be explained based on FIGS. 2 to 4.

First, the valve seat 11 is driven into the valve seat mounting hole 23, which has a flange seat 21 at the upper end and a tapered surface 22 whose diameter increases downwardly at the lower end. Figure 2 shows the state at this time, where the valve seat mounting hole 23
The cylindrical body 11a is attached to the other end of the outer peripheral surface of the cylindrical body 11a that fits into the cylindrical body 11a.
When driving a valve body having a protrusion 13 protruding outward from the outer circumferential surface of the valve seat 1 into the valve seat mounting hole, the protrusion 13 deforms and bends inward.
The endless protruding portion 13 at the lower end of the cylinder body has disappeared, and the lower end portion of the cylinder body is bent approximately inward. Next, as shown in FIG. 3, by driving the tool B into the inside of the cylindrical body 11a of the valve seat 11, the lower end of the cylindrical body 11a bent inwardly is expanded outward, and then the fourth As shown in the figure, an expander 24 is inserted into the cylindrical body 11a of the valve seat 11 to expand the diameter of the cylindrical body 11a, and the inner circumferential edge of the valve seat mounting hole 23 is bitten into the outer circumferential surface of the expander 24. It is firmly fixed.

Since the present invention is constructed as described above, that is, the flange and the protrusion are provided only on the outer peripheral surface of the cylinder, the distance from the inner peripheral surface of the cylinder to the tip of the flange is Since it is shorter than conventional valve seats that have protrusions on the surface, it can be manufactured from thicker tubes that are thinner than conventional valve seats. Therefore, manufacturing costs are low. Furthermore, since the lower end of the cylindrical body having the ridge is bent inward during the process of driving the valve body into the valve seat mounting hole, it can be expanded outward using tool B and mounted on the tapered surface of the valve seat mounting hole. .

Further, in the present invention, only the outer circumferential surface of the cylindrical body needs to be processed, and therefore, the manufacturing process is extremely easy and can be performed simply and quickly.

As described above, the practical value of the present invention is enormous.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of an embodiment of the present invention, Figures 2-4
The figures are cross-sectional views showing each step of installing an embodiment of the present invention into a valve seat mounting hole, and FIG. 5 is a cross-sectional view of a conventional valve seat. 11... Valve seat, 11a... Cylindrical body, 12... Flange, 13... Projection, 23... Valve seat mounting hole.

Claims (1)

[Scope of utility model registration request] A valve characterized in that a flange is provided at one end of the outer peripheral surface of a cylindrical body that fits into a valve seat mounting hole, and a protrusion protruding outward from the outer periphery of the cylindrical body is provided at the other end. seat.