Flow dividing valve

Patent metadata

Field	Value
Publication number	US-10711902-B2
Application number	US-201816086421-A
Country	US
Kind code	B2
Filing date	Jan 25, 2018
Priority date	Jan 31, 2017
Publication date	Jul 14, 2020
Grant date	Jul 14, 2020

Abstract

A valve element movement mechanism includes: a first valve stem having one end portion to which a first valve element to close and open an area between one of the large diameter portion and the small diameter portion is fixed; a second valve stem having one end portion to which a second valve element to close and open an area between the other of the large diameter portions and the small diameter portion is fixed; a first bellows having one end portion fixed to a first bellows flange and the other end portion fixed to the first valve element; a second bellows having one end portion fixed to a second bellows flange and the other end portion fixed to the second valve element; a frame disposed outside the main passage; and an actuator to move the frame in the directions in which valve elements are closed and opened.

First claim

The invention claimed is:

1. A flow dividing valve including:
a body in which a main passage, an inlet passage that is in communication with the main passage, a first outlet passage that is in communication with the main passage, and a second outlet passage that is in communication with the main passage are formed;
a first seat disposed at a portion of the main passage, the portion leading to the first outlet passage;
a second seat disposed at a portion of the main passage, the portion leading to the second outlet passage;
a first valve element that is brought into contact with and is separated from the first seat to close and open the portion that leads to the first outlet passage, respectively;
a second valve element that is brought into contact with and is separated from the second seat to close and open the portion that leads to the second outlet passage, respectively; and
a valve element movement mechanism that moves either one of the first valve element and the second valve element to an opening side and that moves the other of the first valve element and the second valve element to a closing side in an interlocked manner, wherein
the main passage has two large diameter portions and a small diameter portion located between the large diameter portions, with the inlet passage being in communication with the small diameter portion, the first outlet passage being in communication with one of the large diameter portions, and the second outlet passage being in communication with the other of the large diameter portions, and
the valve element movement mechanism comprises:
a first valve stem that has one end portion to which the first valve element configured to close and open an area between the one of the large diameter portions and the small diameter portion of the main passage is fixed, and that extends along a direction in which the first valve element is closed and opened;
a second valve stem that has one end portion to which the second valve element configured to close and open an area between the other of the large diameter portions and the small diameter portion of the main passage is fixed, and that extends along a direction in which the second valve element is closed and opened;
a first bellows having one end portion that is fixed to a first bellows flange and the other end portion that is fixed to the first valve element;
a second bellows having one end portion that is fixed to a second bellows flange and the other end portion that is fixed to the second valve element;
a frame that is disposed outside the main passage and that is connected to the first valve stem and the second valve stem; and
an actuator configured to move the frame in the directions in which the first valve element and the second valve element are closed and opened,

wherein the flow dividing valve includes a plate that has a through hole through which the first valve stem or the second valve stem is to be inserted and that causes the first bellows flange or the second bellows flange to be pressed against the body, and a seal member is provided between the plate, and the first valve stem or the second valve stem.

2. The flow dividing valve according to claim 1 , wherein the actuator is a cylinder having a cylinder body and a cylinder rod, and the cylinder body is fixed to the body of the flow dividing valve via a spacer.

3. The flow dividing valve according to claim 1 , wherein the first valve element has the same shape as the second valve element.

4. The flow dividing valve according to claim 1 , wherein the first valve element and the second valve element each have a surface that is brought into contact with and is separated from the first seat and the second seat, respectively, and the surface has a tapered shape.

5. The flow dividing valve according to claim 1 , wherein flow rate characteristics of a fluid that flows between the first valve element and the first seat and a fluid that flows between the second valve element and the second seat are linear flow characteristics.

6. A flow dividing valve including:
a body in which a main passage, an inlet passage that is in communication with the main passage, a first outlet passage that is in communication with the main passage, and a second outlet passage that is in communication with the main passage are formed;
a first seat disposed at a portion of the main passage, the portion leading to the first outlet passage;
a second seat disposed at a portion of the main passage, the portion leading to the second outlet passage;
a first valve element that is brought into contact with and is separated from the first seat to close and open the portion that leads to the first outlet passage, respectively;
a second valve element that is brought into contact with and is separated from the second seat to close and open the portion that leads to the second outlet passage, respectively; and
a valve element movement mechanism that moves either one of the first valve element and the second valve element to an opening side and that moves the other of the first valve element and the second valve element to a closing side in an interlocked manner, and
the flow dividing valve configured to be switchable among:
a state of a 0% opening degree in which a position of the first valve element with respect to the first seat is at a fully open position and a position of the second valve element with respect to the second seat is at a fully closed position;
a state of a 100% opening degree in which the position of the first valve element with respect to the first seat is at a fully closed position and the position of the second valve element with respect to the second seat is at a fully open position; and
a state of an intermediate opening degree in which the position of the first valve element with respect to the first seat is at a required open position and the position of the second valve element with respect to the second seat is also at a required open position, wherein,

regarding a sum of:
a Cv value on a side of the first outlet passage formed between the first seat and the first valve element; and
a Cv value on a side of the second outlet passage formed between the second seat and the second valve element;

the sum in the state of the intermediate opening degree is not greater than the sum in the state of the 0% opening degree, and is not greater than the sum in the state of the 100% opening degree,
wherein each valve element includes:
a first tapered portion that has a specified cone angle and that is brought into contact with the corresponding seat when the valve element is fully closed; and
a second tapered portion that has a cone angle smaller than that of the first tapered portion and that is contiguous with a distal end side of the first tapered portion.

7. The flow dividing valve according to claim 6 , wherein
the main passage has two large diameter portions and a small diameter portion located between the large diameter portions, with the inlet passage being in communication with the small diameter portion, the first outlet passage being in communication with one of the large diameter portions, and the second outlet passage being in communication with the other of the large diameter portions, and
the valve element movement mechanism includes:
a first valve stem that has one end portion to which the first valve element configured to close and open an area between the one of the large diameter portions and the small diameter portion of the main passage is fixed, and that extends along a direction in which the first valve element is closed and opened;
a second valve stem that has one end portion to which the second valve element configured to close and open an area between the other of the large diameter portions and the small d

Assignees

• Fujikin Kk

Inventors

• Tanikawa Tsuyoshi
• Ishibashi Keisuke
• Yakushijin Tadayuki
• Yamaji Michio
• Dohi Ryousuke
• Shimomura Yoshinori
• Funakoshi Takashi

Classifications

• F16K41/10

  with diaphragm, e.g. shaped as bellows or tube · CPC title

• F16K1/38

  of conical shape · CPC title

• F16K1/36

  Valve members (for double-seat valves F16K1/44 {; for butterfly valves F16K1/222, F16K1/223}) · CPC title

• F16K41/103

  the diaphragm and the closure member being integrated in one member · CPC title

• F16K11/048 Primary

  with valve seats positioned between movable valve members · CPC title