JPS62393B2 - - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a cage valve with a plug that slides within the cage.

[Prior art]

Conventionally, this type of cage valve, especially a large cage valve, has been designed to allow the cage to be installed inside the valve body even if the dimensions of the valve body and cage change due to thermal expansion caused by temperature changes in the fluid, etc. The cage is divided into upper and lower parts.

However, in such a cage valve, the dividing position of the cage is set between the two valve seats, so there is a drawback that a sufficient liquid seal is not achieved at the valve seat.

Therefore, as shown in Fig. 1, a cage valve is also adopted in which the liquid seal on the upper cage 1 side of the two divided cages 1 and 2 is performed using a piston-type sheet material 4 attached to a plug 3. Upper cage 1
There is a disadvantage that the machining accuracy of the peripheral wall 5 becomes high. Another disadvantage is that the sheet material 4 is easily worn out.

[Summary of the invention]

The present invention was developed in view of these circumstances, and involves fitting a presser ring to the divided ends of the upper and lower cages, and press-fitting the gasket into the space formed between the presser ring and the outer peripheral surfaces of both cages. This extremely simple structure provides a cage valve that can reliably seal the liquid between the valve seat and the divided portions of both cages. Hereinafter, the configuration and the like will be explained in detail with reference to embodiments shown in the drawings.

〔Example〕

FIG. 2 is a sectional view showing a cage valve according to the present invention;
FIG. 3 is a sectional view showing the main parts of the cage valve. In the figure, what is indicated by the reference numeral 11 is a valve main body, inside which compartments 13 and 14 are formed which are partitioned vertically by a partition wall 12.
and 14 are opened on both sides of the valve body 11 by an inlet 15 and an outlet 16, respectively. 17 and 18 are an upper cage and a lower cage, respectively;
It is formed by dividing a generally known cylindrical cage in a direction perpendicular to the axial direction. Both of these cages 17 and 18 are formed in a step shape so that their divided ends can be fitted into each other, and among these, the lower cage 18 has a plurality of fluid passage windows 19 on its peripheral wall, and the upper and lower portions of the windows 19 are are provided with valve seats 20 and 21 having different diameters. Reference numeral 22 denotes a presser ring having an inner flange 23, which is fitted into the divided ends of both the cages 17 and 18. 24
is a packing made of rubber, and is press-fitted into a space 25 formed between the presser ring 22 and the outer peripheral surfaces of both the cages 17 and 18. This patch king 24
and both cages 17, 18 by the presser ring 22.
This makes it possible to seal the liquid at the dividing part. Reference numeral 26 denotes a plug having seating portions 27 and 28 that can be brought into close contact with the valve seats 20 and 21, respectively, and is made of the same material as the cages 17 and 18, and slides vertically within the cages 17 and 18. It is configured as follows.

In the cage valve configured in this manner, the plug 26 and the lower cage 18 material have the same coefficient of thermal expansion, so even if both members expand and contract, the liquid seal at both valve seats 20 and 21 is maintained. Further, since the liquid seal at the divided portion of both cages 17 and 18 is performed by the packing 24 and the presser ring 22, no fluid leaks from the divided portion.

Note that when the cage valve according to the present invention is used at high temperatures, it is desirable that the retaining ring 22 be formed of a metal material having a smaller coefficient of thermal expansion than both cages 17 and 18; It is preferable that the cages 17 and 18 be made of a metal material having a larger coefficient of thermal expansion than the cages 17 and 18. Furthermore, as shown in Fig. 4, packing 29
If it is made of a tetrafluoride resin material with a V-shaped cross section,
The packing 29 is in close contact with the circumferential surfaces of the presser ring 22 and both cages 17, 18, and the liquid sealing at the divided portion is more effectively performed.

〔Effect of the invention〕

As explained above, according to the present invention, valve seats having different diameters are provided in the lower cage of the upper and lower cages,
A retainer ring was fitted to the divided ends of both cages, and a gasket was press-fitted into the space formed between the retainer ring and the outer circumferential surfaces of both cages, thereby creating a liquid seal at the valve seat and the divided portion of both cages. It can be done reliably. Therefore, there are advantages such as high machining accuracy on the peripheral wall of the upper cage and no need for the piston ring type sheet material that was conventionally required.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional cage valve, Fig. 2 is a sectional view showing a cage valve according to the present invention, Fig. 3 is a sectional view showing the main parts of the cage valve, and Fig. 4 is a sectional view showing another embodiment. It is a sectional view showing an example. 17... Upper cage, 18... Lower cage, 1
9... Fluid passage window, 20, 21... Valve seat, 22
... Presser ring, 24 ... Packing ring, 25 ... Space section.

Claims (1)

[Scope of Claims] 1. The divided ends of the upper cage and lower cage formed by dividing a cylindrical cage are formed into a step shape that can be fitted together, and a fluid passage hole is formed in the peripheral wall. A window and valve seats provided above and below the window and having different diameters are provided in the lower cage, and a retainer ring is fitted to the divided ends of both cages,
A cage valve characterized in that a packing is press-fitted into a space formed between the retainer ring and the outer peripheral surfaces of both cages. 2. The cage valve according to claim 1, wherein the retaining ring is formed of a metal material having a coefficient of thermal expansion different from that of the cage. 3. The cage valve according to claim 1, wherein the packing is made of a tetrafluoride resin material having a V-shaped cross section.