JPH0734261U - Flow control valve - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a valve with an eccentric structure that can control the flow rate as well as opening and closing the flow path. [Structure] In a valve box 1, a valve body 4 that rotates around an axis of a valve rod 2 to open and close a channel 3 in a valve box is provided at a position eccentric from the axis of the valve rod 2. The valve body 4 is composed of a main valve body 7 having a plurality of ports 6 and a sub-valve body 9 capable of closing each port 6 of the main valve body 4 slidingly contacting the main valve body 4. [Effect] By providing the double-structured valve body including the main valve body and the sub valve body, the flow rate can be controlled by the opening degree of the sub valve body and the port of the main valve body.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an eccentric flow control valve.

[0002]

[Prior art]

 Conventionally, eccentric type valves such as an eccentric butterfly valve have been used in electric power and chemical plants.

[0003]

[Problems to be solved by the device]

 However, the basic operation of the eccentric structure valve is to open and close the flow passage, and it is difficult to control the flow rate at such intermediate and minute openings by using such a valve.

The present invention solves the above problems and an object of the present invention is to provide a valve having an eccentric structure that can control not only the opening and closing of a flow path but also the flow rate.

[0005]

[Means for Solving the Problems]

 The flow control valve of the present invention is provided with a valve body in the valve box which is rotated around the axis of the valve stem to open and close the flow passage in the valve box at a position eccentric from the axial center of the valve stem. Is composed of a main valve body having a plurality of ports, and a sub-valve body movably provided between a position where each port of the main valve body is closed and a position where the port is opened.

[0006]

[Action]

 In the above flow rate control valve, a valve body having a double structure including a main valve body having a plurality of ports and an auxiliary valve body movably provided between a position where each port of the main valve body is closed and a position where the port is opened. With the above configuration, the flow rate can be controlled by the opening degree of the sub valve body and the port provided in the main valve body. That is, when both the main valve body and the sub valve body are positioned in the direction of the flow passage cross section, each port of the main valve body is closed by the sub valve body and the flow passage is closed. When the main valve body is positioned in the direction of the flow passage cross section and the sub valve body is moved in the direction of the flow passage cross section, each port of the main valve body is opened and opened according to the opening degree of the sub valve body. The controlled fluid flows down through the port. When both the main valve body and the sub-valve body are positioned so as to be displaced from the direction of the cross section of the flow path, the flow path is almost completely opened because the valve has an eccentric structure.

[0007]

【Example】

 Hereinafter, a flow control valve according to an embodiment of the present invention will be described with reference to FIGS. The flow control valve has a valve rod 2 which is rotatably inserted in the valve box boss at the upper and lower portions of the valve box 1 in the valve box 1 and is disposed at a position eccentric from the axial center of the valve rod 2. A valve body 4 that opens and closes the flow path 3 in the valve box by rotating around the axis 2 is provided, and a valve box seat 5 is provided at a position corresponding to the valve body 4 on the inner peripheral surface of the valve box 1.

The valve body 4 has an arc-shaped cross section, and as shown in FIGS. 4 to 6, a main valve body 7 having a plurality of ports 6 formed in the direction of the flow path cross section, and a main valve body 7 It is composed of an auxiliary valve body 9 which is in sliding contact with the inner peripheral surface 8 of the valve body 7. The main valve body 7 and the sub-valve body 9 are fixed to the main valve stem 12 or the sub-valve stem 13 constituting the valve stem 2 at the upper and lower holes 10 and 11, respectively. It can be moved separately as the valve rod 13 rotates.

The operation of the above configuration will be described below with reference to FIGS. 1 to 3, arrow A indicates the direction of flow of the controlled fluid. FIG. 1 shows a fully closed state of the valve. Since both the main valve body 7 and the sub valve body 9 are positioned in the direction of the flow passage cross section, each port 6 of the main valve body 7 is closed by the sub valve body 9. The flow path 3 is closed.

FIG. 2 shows a half-opened state of the valve, in which the main valve body 7 is located in the direction of the flow passage cross section and the sub valve body 9 is displaced from the direction of the flow passage cross section. Since each port 6 of the main valve body 7 is opened by the opening degree, that is, the amount of movement of the sub valve body 9, the controlled fluid flows down through the opened port 6. At this time, the flow rate is controlled by the opening degree of the sub valve body 9, and cavitation is suppressed because the flow of the controlled fluid does not change in the upstream and downstream portions of the port 6.

Further, FIG. 3 shows a fully opened state of the valve, and since the main valve body 7 and the sub-valve body 9 are both not located in the direction of the cross section of the flow path and are provided at eccentric positions, The channel 3 is almost completely open. Therefore, the controlled fluid flows down without being blocked by the valve bodies 7 and 9.

[0012]

[Effect of device]

 As described above, according to the present invention, the main valve body having a plurality of ports and the auxiliary valve body capable of slidingly contacting the main valve body to close each port of the main valve body have a double structure. By providing such a valve body, it becomes possible to control the flow rate at an intermediate and minute opening degree by the valve of the eccentric structure which was conventionally used mainly for opening and closing the flow path. Also, since the shape of the flow of the controlled fluid does not change in the upstream and downstream parts of the port, the occurrence of cavitation can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing a fully closed state of a flow control valve according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a half-open state of the flow control valve of the same embodiment.

FIG. 3 is a sectional view showing a fully open state of the flow control valve of the same embodiment.

FIG. 4 is an explanatory diagram showing a configuration of a valve body of the flow rate control valve of the embodiment.

5 is a perspective view of a main valve body as a constituent member of the valve body shown in FIG.

6 is a perspective view of a sub valve body as a constituent member of the valve body shown in FIG.

[Explanation of symbols]

 1 valve box 2 valve stem 3 flow path in valve box 4 valve body 6 port 7 main valve body 9 auxiliary valve body

Claims (1)

[Scope of utility model registration request] 1. A valve body, which rotates around an axis of a valve rod to open and close a flow passage in the valve box, is provided in a position at a position eccentric from the axial center of the valve rod. A flow control valve comprising a main valve body having a port and a sub valve body movably provided between a position where each port of the main valve body is closed and a position where the port is opened.