JPS6030877A - Cage valve - Google Patents

Abstract

PURPOSE:To keep off any vibration in a valve plug, by installing an eccentric goove in position between two valve seating parts on an outer circumferential surface of the valve plug being retractably installed inside a cage having valve seats different in each caliber. CONSTITUTION:An eccentric groove 21 is installed in position between two valve seating part 8 and 9 on an outer circumferential surface of a valve plug 6, while a groove bottom 22 is formed on a cylindrical surface being eccentric with another cylindrical surface of the valve plug 6. Since a lot of fluids run past between the valve plug 6 inside a deep groove 21, that is, being formed with a wide clearance and a cage 1, there produces a pressure differential in and around the valve plug 6, and with this pressure differential, the valve plug 6 is made to act on its one side. With this constitution, any vibration in the valve plug is preventable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cage valve having a function of preventing vibration of a valve plug sliding inside the cage.

[Prior art]

Conventionally, this type of cage valve has been constructed as shown in FIG. Valve seats 4 with different diameters are provided above and below this window 3.
5 is provided.

Reference numeral 6 denotes a valve plug that slides vertically on the valve shaft T, and is disposed in the cage 1 so as to be able to move forward and backward. Seating portions 8 and 9 are provided. Thereby, the opening area of the fluid passage window 3 is changed to control the flow rate. Reference numeral 10 denotes a through hole that communicates between the upper and lower parts of the valve plaza 6, which is bored in the upper part of the valve plug 6, thereby reducing the pressure difference generated on both the upper and lower sides, and allowing the valve plaza 6 to communicate with the upper and lower parts of the valve plaza 6. This reduces the load on the drive unit (not shown) disposed in the drive unit.

11 is an annular groove opening inside the cage 1;
A gasket is provided between the upper valve seat 4 and the window 3 on the inner circumferential surface of the cage 1 to prevent fluid entering between the inner circumferential surface of the cage 1 and the outer circumferential surface of the valve plug 6 from penetrating into the upper part due to pressure drop. It is composed of This allows the valve plug 6 in the cage 1 to
prevents vibration.

However, in the conventional cage valve, the valve plug 6 slightly rises. Even if it is possible to prevent vibration of the valve plug 6 when the valve is fully opened, or when the inner peripheral surface of the cage 1 and the valve plug 6 When a fluid with a high differential pressure enters between the outer circumferential surfaces of the cylinder, there is a problem in that the vibration cannot be prevented.

[Summary of the invention]

The present invention was made in view of these circumstances, and is an extremely simple MI method in which an eccentric groove is provided on the outer peripheral surface of the valve plug.
The present invention provides a cage valve that can reliably prevent vibration of the valve plug within the cage. Hereinafter, the configuration and the like will be explained in detail with reference to embodiments shown in the drawings.

〔Example〕

FIG. 2 is a cross-sectional view showing a cage valve according to the present invention, and FIG. 3 is a cross-sectional view taken along the line ■-■ in FIG. 2. In these figures, the same members as in FIG. Detailed explanation will be omitted. Reference numeral 21 denotes an eccentric groove that opens on the peripheral wall 2 side of the cage 1, and is provided on the outer peripheral surface of the valve plug 6, and is provided directly between the rain seat portion 8.9.
It is formed by a cylindrical surface and an eccentric cylindrical surface.

In the cage valve configured in this way, when the valve is opened, that is, when the valve seats 4, 5 and the seating parts 8, 9 are separated, after the fluid passes through the leg 3, the space between the valve seat 5 and the seating part 9 is The flow A flows through the air and reaches the outlet port 1a, and the flow A flows through the gap between the outer peripheral surface of the valve plug 6 and the inner peripheral surface of the cage 1, and flows between the valve seat 4 and the seating portion 8 to form the valve. It enters the upper cavity 23 of the plug 6, passes through the through hole 10 and enters the valve plug 6, where it is divided into a flow B which joins the flow A. At this time, a large amount of fluid flows between the cage 1 and the valve plug 6 in the deep eccentric groove 21, in which a wide gap is formed, so a pressure difference is generated around the valve plug 6, and this pressure difference causes the valve plug to acts in one direction.

Therefore, as long as the fluid is flowing through the gap between the valve plug 6 and the cage 1, even if there are pressure fluctuations in the fluid, the state of pressing the valve plug 6 in one direction will not be released. It's not easy.

Note that if the eccentric groove 21 is formed by casting with the same groove width all around the circumference, there will be no need to perform groove machining, and the valve plug 6
Another advantage is that the entire mechanical finishing process can be easily performed.

〔Effect of the invention〕

As explained above, according to the present invention, an eccentric groove is provided on the outer circumferential surface of the valve plug between the rain seating portions, so that fluid entering the gap between the outer circumferential surface of the valve plug and the inner circumferential surface of the cage is provided. The fluid pressure difference caused by this can act on the valve plug in one direction to reliably prevent vibration of the valve plug within the cage.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing a conventional cage valve, Fig. 2 is a cross-sectional view showing a cage valve according to the present invention, and Fig. 3 is a cross-sectional view showing the cage valve according to the present invention.
FIG. 1@・am cage% 211 e-・peripheral wall, 3・・・・
Fluid passage window, 4.5--valve seat, 6--valve plug, 8, 9--seating portion, 21-e@fist eccentric groove. Patent applicant: Yamatake Honeywell Co., Ltd. Agent: Masaki Yamakawa (and 1 other person) Continued from page 1 0 Inventor: Saka 1) Susumu @ Inventor: Kawai 500 Omagari, Kanyo-cho, Koza-gun, Manakanayo Prefecture Yamatake Honeywell Co., Ltd. Company Samukawa Factory 500 Omagari, Kanyo-cho, Koza-gun, Kanagawa Prefecture Samu Honeywell Co., Ltd. Samukawa Factory

Claims (2)

[Claims] (1) A cylindrical cage having a fluid passage window drilled in the peripheral wall and valve seats of different diameters provided above and below the window, and a cylindrical cage having valve seats of different diameters, and a cylindrical cage having valve seats of different diameters, and a cylindrical cage having valve seats of different diameters. A cage valve comprising a valve plug each having a seatable seat, the outer circumferential surface of the valve plug comprising:
A cage valve characterized in that an eccentric groove is provided between the fixed seat parts. (2) The cage valve according to claim 1, wherein the eccentric groove is cast with the same groove width all around the circumference.