JPS6030875A - Cage valve - Google Patents

Abstract

PURPOSE:To keep off any vibration in a valve plug inside a cage, by installing a groove in position between two valve seats on one side of an inner circumferential surface of the cylindrical cage having these valve seats different in ech caliber. CONSTITUTION:A groove 21 is installed in position between two valve seats 4 and 5 on one side of an inner circumferential surface of a cage 1. And, a clearance h1 made up between the outer circumferential surface of a valve plug 6 and the one side inner circumferential surface of the cage 1 is set to be wider than a clearance h2 made up at the opposite side to the groove 21. Since a lot of fluids run past between the valve plug 6 formed with the wider clearance h1 and the 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 one direction. With this constitution, any vibration in the valve plug 6 inside the cage 1 is preventable from occurring without fail.

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 installed above and below the window 3.
5 is provided.

Reference numeral 6 denotes a valve plug that slides vertically on the valve shaft 7, and is disposed in the cage 1 so as to be able to move forward and backward, and can be seated on the outer circumferential surface of both the valve seats 4 and 5, respectively. Seating portions 8 and 9 are provided. Due to the deviation, 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 plug 6, which is bored in the upper part of the valve plug 6, thereby reducing the pressure difference that occurs between the upper and lower sides, and allowing the valve plug 6 to communicate with the upper and lower parts of the valve plug 6 at isolated positions via the valve shaft T. This reduces the load on the installed drive unit (not shown).

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

However, in the conventional cage valve, although it is possible to prevent the vibration of the valve plug 6 when the valve plug 6 is slightly raised at a small opening, when the valve plug 6 is fully opened or when the inner peripheral surface of the cage 1 and the outside of the valve plug 6 are When a fluid with a high differential pressure enters between one circumferential surface, there is a disadvantage that the vibration cannot be prevented.

[Summary of the invention]

The present invention has been made in view of the above circumstances, and provides a cage valve that can reliably prevent the vibration of a valve plug within a cage with an extremely simple structure in which a groove is provided on the inner peripheral surface of one side of the cage. It is something. 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, and Fig. 3 is a sectional view 11 of Fig. 2. In these figures, the same members as in Fig. 1 are designated by the same reference numerals, and detailed Explanation will be omitted. In the figure, reference numeral 21 denotes a groove that opens toward the peripheral wall 2 of the cage 1, and is provided on the inner circumferential surface of one side of the cage 1 between the two valve seats 4.5. As a result, the gap h1 formed between the outer circumferential surface of the valve plug 6 and the inner circumferential surface of one side of the cage 1 is set wider than the gap h2 formed on the side opposite to the groove 21.

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 window 3, the space between the valve seat 5 and the seating parts 9 is The flow A flows through the valve and reaches the outlet 1a, passes through the gap between the outer circumferential surface of the valve glove 6 and the inner circumferential surface of the cage 1, and flows between the valve seat 4 and the seating part 8 to form the valve. B enters the upper cavity 22 of the plug 6 and passes through the through hole 10 into the valve plug 6 where it joins the flow A.
It is divided into two parts. At this time, inside the groove 21, that is, the wide gap h
1 is formed, and a large amount of fluid flows between the cage 1 and the valve plug 6, a pressure difference is generated around the valve plug 6, and this pressure difference acts on the valve plug 6 in one direction.

Therefore, while the fluid is flowing through the gap between the valve plug 6 and the cage 1, even if there is a pressure fluctuation in the fluid, the state in which the valve plug 6 is pressed in one direction is almost never released.

In this embodiment, the groove 21 is provided on a part of the inner peripheral surface of the cage 1, but as shown in FIGS. 4 and 5, the groove bottom 23 is eccentrically formed on the outer peripheral surface of the cage Even if the eccentric groove 24 formed by the circumferential surface is provided on the inner peripheral surface of the cage 1 over the entire circumference, the same effect as in the embodiment can be obtained. In this case, if the eccentric grooves 24 are formed with the same groove width, damage to the cutter during machining can be reduced, and the machining operation can be performed more easily.

〔Effect of the invention〕

As explained above, according to the present invention, a groove is provided on the inner circumferential surface of one side of the cage between both valve seats, so that fluid entering the gap between the outer circumferential surface of the valve plug and the inner circumferential surface of the cage is prevented. The fluid pressure difference 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 1-1 in Fig. 2.
4 is a cross-sectional view showing another embodiment, and FIG. 5 is a cross-sectional view taken along the line -■ in FIG. 4. 1...Cage, 2...Self-surrounding wall, 3...Fluid passage window, 4, 5...Valve seat, 6...Valve plug, 8
, 9... Φ seating part, 2111... groove. Patent applicant Yamatake Honeywell Co., Ltd. Agent Masaki Yamakawa (1311 people) Figure 2 Figure 4 Figure 5 Closed

Claims (1)

[Claims] A cylindrical cage having a fluid passage window bored in the peripheral wall and valve seats of different diameters provided above and below the window, and a cylindrical cage that is movable forward and backward within the cage and can be seated on each of the valve seats. What is claimed is: 1. A cage valve comprising: a valve plug having a seat portion; the cage valve having a groove provided on an inner circumferential surface of one side of the cage between the valve seats;