JPH04316771A - Cage valve - Google Patents

Abstract

PURPOSE:To provide a flow rate higher than a maximum flow rate during normal operation. CONSTITUTION:A window 11 for a rise is located to a fluid pass window 10 formed in a cage 7. Usually, by changing the opening area of the fluid pass window 10 by means of a valve plug 14, a flow rate is controlled. During the starting of operation of a device on the secondary side, the valve plug 14 is caused to further rise and the window 11 for a rise is fully opened.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cage valve, which is a type of control valve used primarily to control the flow rate and to circulate and cut off various fluids in a pipe.

0002

[Prior Art] As a conventional cage valve, for example, the Japanese Patent Publication No. 2
There is one shown in Japanese Patent No.-18470. A cage consisting of a cylindrical peripheral wall is placed inside the valve chamber, a window is provided in the peripheral wall for fluid to pass through, a lower valve seat is provided under this window, and a valve plug is placed inside the cage. A lower valve seat corresponding to the lower valve seat is provided on the outer peripheral surface of the valve plug.

[0003] The valve plug is moved up and down by the actuation or sliding operation of a drive unit by an automatic control device, and the opening area of the fluid passage window is changed to control the flow rate. The fluid passage window can obtain the flow rate from the minimum flow rate to the maximum flow rate that needs to be controlled during normal operation, and is linear and equal.
It is formed so as to obtain flow characteristics such as lupercent.

0004

[Problem to be solved by the invention] In the above conventional method,
The fluid passage window is formed to obtain the maximum flow rate during normal operation, so it can be used when you want to start up the device in a short time by flowing a larger flow rate, such as when starting the operation of the secondary side device. There were some inconveniences that I couldn't deal with.

[0005] Therefore, the technical problem of the present invention is to obtain a flow rate higher than the maximum flow rate during normal operation.

[0006]

[Means for Solving the Problems] The technical means of the present invention taken to solve the above-mentioned technical problems is to form an inlet, a valve chamber, and an outlet in a valve casing, and to form a cylindrical structure in the valve chamber. A cage is arranged, a fluid passage window is provided in the cage, a lower valve seat is provided under this window, a valve plug is arranged in the cage, and the lower valve seat is provided on the outer peripheral surface of the valve plug. An underwear seat corresponding to the cage is provided, and a rising window is provided above the fluid passage window of the cage.

[0007]

[Operation] The operation of the above technical means is as follows. During normal operation, the valve plug is slid up and down to change the opening area of the fluid passage window and control the flow rate. When a larger flow rate is required, such as when starting the operation of a device on the secondary side, the valve plug is further moved in the opening direction and the opening window is also opened to allow a larger flow rate to flow. be able to.

[0008]

[Example] An example showing a specific example of the above technical means will be described (see FIG. 1). Connect body 1 and bonnet 2 with bolt 3
to form the valve casing. An inlet 4, a valve chamber 5, and an outlet 6 are formed in the main body 1. A cylindrical cage 7 is housed within the valve chamber 5. Gaskets 8 and 9 maintain airtightness between the cage 7, the main body 1, and the bonnet 2.

A fluid passage window 10 and a rising window 11 are formed above the fluid passage window 10 on the peripheral wall of the cage 7. Two fluid passage windows 10 and two rising windows 11 are formed on the left and right sides, respectively. As shown by the dotted line, the fluid passage window 10 is formed into a substantially inverted triangular shape that is wider toward the top and narrower toward the bottom, so that equal percent flow characteristics can be obtained. The shape of the rising window 11 is approximately rectangular, as shown by the dotted line.

A lower valve seat 12 is formed below the fluid passage window 10 of the cage 7, and an upper valve seat 13 is formed above the rising window 11. A valve plug 14 is housed within the cage 7. The outer peripheral surface of the valve plug 14 is formed with an lower seat part 15 that seats on and off the lower valve seat 12 and an upper seat part 16 that seats on and off the upper valve seat 13. Valve plug 1
4 is formed with a through hole 17 passing through it from the top and bottom. Valve plug 1
4 is integrally formed with an operating shaft 18 for operating from the outside. Airtightness between the operating shaft 18 and the bonnet 2 is maintained by a packing 19.

In the illustrated state, the lower seat portion 1 of the valve plug 14 is
5 and upper seating portion 16 are seated on the lower valve seat 12 and upper valve seat 13 of the cage 7, showing the valve closed state. When the operating shaft 18 is raised from this state by actuation of a drive unit by an automatic control device or by manual operation, the valve plug 14 rises together, changing the opening area of the fluid passage window 10. This controls the flow rate from the inlet 4 to the outlet 6. The flow rate when the fluid passage window 10 is fully opened is the maximum flow rate during normal operation. Then, when the operating shaft 18 is further raised, the valve plug fully opens the rising window 11. As a result, a flow rate greater than the maximum flow rate during normal operation can be obtained.

0012

[Effects of the Invention] The present invention produces the following unique effects. As described above, according to the present invention, by forming the rising window above the fluid passage window, it is possible to flow a flow rate higher than the maximum flow rate during normal operation. Therefore, the start-up time of the secondary side device can be shortened.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the cage valve of the present invention.

[Explanation of symbols]

1 Main body 4 Entrance 5 Valve chamber 6 Exit 7 Cage 10 Fluid passage window 11 Standing window 12 Lower valve seat 14 Valve plug 15 Underwear seat

Claims (1)

[Claims] Claim 1: An inlet, a valve chamber, and an outlet are formed by a valve casing, a cylindrical cage is arranged inside the valve chamber, a fluid passage window is provided in the cage, and a lower part is provided below the window. A valve seat is provided, a valve plug is placed in the cage, an under seat portion corresponding to the lower valve seat is provided on the outer peripheral surface of the valve plug, and a rising window is provided above the fluid passage window of the cage. A cage valve provided.