JP2005024090A - Ball valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To release remaining pressure located at an outlet from a discharge port provided separately from an inlet and the outlet and communicated with outside air. <P>SOLUTION: An outlet side annular valve seat 12 has a through-hole 24 passing from the abutment face of a valve ball 10 to the abutment face of an outlet side member 5, and the outlet side member 5 has the discharge port 25 having one end communicated with the through-hole 24 of the outlet side annular valve seat 12 and the other end communicated with the outside air. The valve ball 10 has a first through-hole 26 for communicating a distribution hole 9 with the inlet 2 in a first shut-off condition and for communicating the distribution hole 9 with the outlet 4 in a second shut-off condition where the valve ball 10 is turned 180° from the first shut-off condition, and a second through-hole 27 for communicating the distribution hole 9 with the through-hole 24 in the second shut-off condition and to be shut off with the inlet side annular valve seat 11 in the first shut-off condition. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a ball valve that is attached to a fluid pipe and communicates and shuts off the inlet and the outlet, and in particular, an outlet that communicates with the outside air is provided separately from the inlet and the outlet so that the outlet and the outlet can be communicated and blocked. About. This ball valve is used, for example, to release the residual pressure on the secondary side.

  A conventional ball valve is disclosed in, for example, Japanese Utility Model Publication No. 59-188360. In this ball valve, a valve chamber in which an inlet and an outlet communicate with each other in a casing is formed, a valve ball having a circulation hole is arranged in the valve chamber, an inlet-side annular valve seat is disposed on the inlet side of the valve ball, and an outlet side is disposed on the outlet side. An annular valve seat is arranged, and a valve ball is rotated by a valve shaft that penetrates the casing in an airtight manner to communicate or block the inlet and outlet.

The conventional ball valve described above does not have a function of extracting the residual pressure at the outlet from an outlet that communicates with outside air different from the inlet / outlet only by rotating / closing the valve ball to connect / block the inlet / outlet. . Therefore, for example, the residual pressure on the secondary side cannot be removed.
Japanese Utility Model Publication No. 59-188360

  Therefore, the technical problem of the present invention is to provide a ball valve that can extract the residual pressure at the outlet from an outlet that communicates with outside air different from the inlet and outlet.

  The technical means of the present invention devised to solve the above technical problem is that a valve chamber in which an inlet and an outlet communicate with each other in a casing is formed, and a valve ball in which a flow hole is formed is disposed in the valve chamber. In a ball valve in which an inlet-side annular valve seat is arranged on the inlet side and an outlet-side annular valve seat is arranged on the outlet side, and the valve ball is rotated by a valve shaft hermetically penetrating the casing to connect or block the inlet and outlet. The outlet side annular valve seat is formed with a through hole penetrating from the valve ball contact surface to the casing contact surface, and one end of the casing is formed in the through hole of the outlet side annular valve seat and the other end is connected to the outside air. Then, in the first shut-off state in which the valve ball shuts off the inlet and the outlet, the valve ball communicates with the inlet and the outlet, and the valve ball is rotated 180 degrees from the first shut-off state so that the valve ball shuts off the inlet and the outlet. In the second shut-off state Forming a first through hole communicating with the hole and the outlet, and a second through hole communicating with the through hole and the through hole in the second blocked state and blocked by the inlet-side annular valve seat in the first blocked state. Features a ball valve. In addition, another technical means of the present invention taken to solve the above technical problem is that a valve chamber in which an inlet and an outlet communicate with each other in a casing is formed, and a valve ball in which a flow hole is formed is arranged in the valve chamber. An inlet-side annular valve seat is arranged on the inlet side of the valve ball, and an outlet-side annular valve seat is arranged on the outlet side, and the valve ball is rotated by a valve shaft that penetrates the casing in an airtight manner to connect or block the inlet and outlet. In the ball valve, the through-hole penetrating from the valve ball contact surface to the casing contact surface is formed in the inlet-side annular valve seat, and one end of the casing communicates with the through-hole of the inlet-side annular valve seat. A discharge port is formed, and the valve ball communicates with the flow hole and the inlet in the first shut-off state where the valve ball shuts off the inlet and the outlet. Second shut off state with exit shut off Forming a first through hole communicating with the flow hole and the outlet and a second through hole communicating with the through hole and the through hole in the second blocked state and blocked by the outlet side annular valve seat in the first blocked state. The ball valve is characterized by that.

  According to the present invention, there is an excellent effect that the residual pressure at the outlet can be extracted from the outlet that communicates with outside air different from the inlet and outlet.

  In the ball valve of the present invention, a through-hole penetrating from the valve ball abutting surface to the casing abutting surface is formed in the outlet-side annular valve seat, and one end of the casing is open to the through-hole of the outlet-side annular valve seat and the other end is exposed to the outside air. A communication outlet is formed, the valve ball is connected to the flow hole and the inlet in the first shut-off state where the valve ball shuts off the inlet and the outlet, and the valve ball is rotated 180 degrees from the first shut-off state. In the second shut-off state in which the inlet and the outlet are shut off, the first through-hole communicates with the flow hole and the outlet. In the second shut-off state, the flow hole and the through-hole communicate with each other, and in the first shut-off state, the inlet side annular valve seat shuts off. The second through hole is formed. In the ball valve of the present invention, a through hole that penetrates from the valve ball contact surface to the casing contact surface is formed in the inlet side annular valve seat, and one end is formed in the casing and the other end is formed in the through hole of the inlet side annular valve seat. A discharge port communicating with the outside air is formed, and the valve ball is connected to the flow hole and the inlet in the first shut-off state where the valve ball shuts off the inlet and the outlet, and the valve ball is rotated 180 degrees from the first shut-off state. A first through-hole communicating with the flow hole and the outlet in the second shut-off state where the ball shuts off the inlet and the outlet; and an outlet-side annular valve seat in the first shut-off state communicating with the through-hole and the through-hole in the second shut-off state. The second through hole to be blocked is formed. Therefore, when the valve ball is rotated to enter the first shut-off state where the inlet and the outlet are shut off, the inlet, outlet and discharge port are shut off, and the valve ball is rotated 180 degrees from the first shut-off state to the second shut-off state. Then, the outlet and the discharge port communicate with each other through the first through hole, the through hole, the second through hole, and the through hole. Therefore, the residual pressure at the outlet can be extracted from the outlet that communicates with outside air different from the inlet / outlet.

  An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 to 4). An inlet side member 3 having an inlet 2 in the main body 1 and an outlet side member 5 having an outlet 4 are fastened with bolts 6 and nuts 7 to form a casing, and a valve chamber 8 in which the inlet 2 and the outlet 4 communicate with each other is formed in the casing. Form.

  A valve ball 10 having a flow hole 9 formed in a straight line in the horizontal direction in the valve chamber 8 is rotatably arranged. An inlet-side annular valve seat 11 is disposed on the inlet 2 side of the valve ball 10, and an outlet-side annular valve seat 12 is disposed on the outlet 4 side of the valve ball 10. The valve ball 10 has a parallel keyway 13 in the upper part, and a key part at the lower end of the valve shaft 14 penetrating the main body 1 is engaged. The valve shaft 14 is hermetically sealed with the main body 1 by a packing 15 and fixed to the main body 1 with a nut 16. Reference numerals 17, 18, 19, and 20 are washers, and 21 is a packing presser. A handle 22 for rotating operation is fixed to the valve shaft 14 with a nut 23.

  The outlet-side annular valve seat 12 has a through-hole 24 that penetrates from the valve ball 10 contact surface to the outlet-side member 5 contact surface, and one end of the outlet-side member 5 is connected to the through-hole 24 of the outlet-side annular valve seat 12. The end has a discharge port 25 communicating with the outside air. The through hole 24 is provided in the lower part of the outlet-side annular valve seat 12 in parallel with the central axes of the inlet 2 and the outlet 4. The valve ball 10 communicates with the flow hole 9 and the inlet 2 in the first shut-off state in which the valve ball 10 shuts off the inlet 2 and the outlet 4 and rotates the valve ball 10 180 degrees from the first shut-off state. The first through hole 26 communicates with the flow hole 9 and the outlet 4 in the second blocked state in which the inlet 2 and the outlet 4 are blocked, and the inlet in the first blocked state communicates with the flow hole 9 and the through hole 24 in the second blocked state. And a second through hole 27 blocked by the side annular valve seat 11. The first through hole 26 is provided in the horizontal direction at a right angle to the flow hole 9, and its central axis passes through the ball center of the valve ball 10. The second through hole 27 is provided 45 degrees obliquely downward from the horizontal direction, and its central axis passes through the ball center of the valve ball 10.

  1 and 2 show a state in which the inlet 2 and the outlet 4 communicate with each other through the flow hole 9 of the valve ball 10. When the valve shaft 14 is rotated 90 degrees counterclockwise by the handle 22 from this communication state and the valve ball 10 is in the first shut-off state in which the inlet 2 and the outlet 4 are shut as shown in FIG. The outlet 4 and the discharge port 25 are blocked. When the valve shaft 14 is rotated 180 degrees by the handle 22 from the first shut-off state to the second shut-off state as shown in FIG. 4, the outlet 4 and the discharge port 25 are connected to the first through hole 26, the flow hole 9, and the first The residual pressure at the outlet 4 can be extracted from the outlet 25 by communicating with the two through holes 27 and the through hole 24.

  Another embodiment showing a specific example of the above technical means will be described (see FIGS. 5 to 8). An inlet side member 53 having an inlet 52 and an outlet side member 55 having an outlet 54 are fastened with a bolt 56 and a nut 57 to form a casing, and a valve chamber 58 in which the inlet 52 and the outlet 54 communicate with each other is formed in the casing. Form.

  A valve ball 60 having a flow hole 59 formed in a straight line in the horizontal direction in the valve chamber 58 is rotatably arranged. An inlet-side annular valve seat 61 is disposed on the inlet 52 side of the valve ball 60, and an outlet-side annular valve seat 62 is disposed on the outlet 54 side of the valve ball 60. The valve ball 60 has a parallel keyway 63 at the upper part, and a key part at the lower end of the valve shaft 64 penetrating the main body 51 is engaged. The valve shaft 64 is kept airtight with the main body 51 by a packing 65 and is fixed to the main body 51 with a nut 66. Reference numerals 67, 68, 69, and 70 are washers, and 71 is a packing presser. A handle 72 for rotating operation is fixed to the valve shaft 64 with a nut 73.

  The inlet side annular valve seat 61 has a through hole 74 that penetrates from the contact surface of the valve ball 60 to the contact surface of the inlet side member 53, and one end of the inlet side member 53 is connected to the through hole 74 of the inlet side annular valve seat 61. The end has a discharge port 75 communicating with the outside air. The through hole 74 is provided in the lower part of the inlet-side annular valve seat 61 in parallel with the central axes of the inlet 52 and the outlet 54. The valve ball 60 communicates with the flow hole 59 and the inlet 52 in the first shut-off state in which the valve ball 60 shuts off the inlet 52 and the outlet 54, and rotates the valve ball 60 180 degrees from the first shut-off state. The first through hole 76 that communicates the flow hole 59 and the outlet 54 in the second blocked state where the inlet 52 and the outlet 54 are blocked, and the outlet in the first blocked state that communicates the flow hole 59 and the through hole 74 in the second blocked state. And a second through hole 77 that is blocked by the side annular valve seat 62. The first through hole 76 is provided at a right angle to the flow hole 59 in the horizontal direction, and its central axis passes through the ball center of the valve ball 60. The second through hole 77 is provided obliquely downward by 45 degrees from the horizontal direction, and its central axis passes through the ball center of the valve ball 60.

  5 and 6 show a state in which the inlet 52 and the outlet 54 communicate with each other through the flow hole 59 of the valve ball 60. When the valve shaft 64 is rotated 90 degrees counterclockwise by the handle 72 from this communication state and the valve ball 60 is in the first shut-off state in which the inlet 52 and the outlet 54 are shut as shown in FIG. The outlet 54 and the discharge port 75 are blocked. When the valve shaft 64 is rotated 180 degrees by the handle 72 from this first shut-off state to the second shut-off state as shown in FIG. 8, the outlet 54 and the discharge port 75 are connected to the first through hole 76, the flow hole 59, the first The residual pressure at the outlet 54 can be extracted from the discharge port 75 through the two through holes 77 and the through hole 74.

Cross-sectional view of a ball valve according to an embodiment of the present invention Central cross-sectional view of FIG. 1 is a cross-sectional view of the center of FIG. 1 when the valve ball of FIG. 1 is rotated 90 degrees counterclockwise to enter the first shut-off state. 1 is a central cross-sectional view of FIG. 1 when the valve ball of FIG. 1 is rotated 90 degrees in the clockwise direction to enter the second blocking state. Cross-sectional view of a ball valve according to another embodiment of the present invention Center cross-sectional view of FIG. 5 is a cross-sectional view of the center of FIG. 5 when the valve ball of FIG. 5 is rotated 90 degrees counterclockwise to enter the first shut-off state. 5 is a central cross-sectional view of FIG. 5 when the valve ball of FIG. 5 is rotated 90 degrees in the clockwise direction to enter the second blocking state.

Explanation of symbols

1,51 Body 2,52 Inlet 3,53 Inlet side member 4,54 Outlet 5,55 Outlet side member 8,58 Valve chamber 9,59 Flow hole 10,60 Valve ball 11,61 Inlet side annular valve seat 12,62 Outlet side annular valve seats 14, 64 Valve shafts 15, 65 Packing 24, 74 Through holes 25, 75 Discharge ports 26, 76 First through holes 27, 77 Second through holes

Claims (2)

A valve chamber in which the inlet and outlet communicate with each other is formed in the casing, a valve ball with a flow hole is arranged in the valve chamber, an inlet-side annular valve seat is arranged on the inlet side of the valve ball, and an outlet-side annular valve seat is arranged on the outlet side In a ball valve that rotates the valve ball with a valve shaft that penetrates the casing in an airtight manner to communicate or block the inlet and outlet, the outlet side annular valve seat penetrates from the valve ball contact surface to the casing contact surface. In the first shut-off state in which the through hole is formed and one end of the casing is formed in the through hole of the annular valve seat on the outlet side and the other end communicates with the outside air, and the valve ball is shut off from the inlet and the outlet. A first through hole that connects the flow hole and the outlet in a second shut off state in which the valve ball is rotated 180 degrees from the first shut off state through the communication hole and the inlet and the valve ball shuts off the inlet and the outlet; In the closed state Ball valve, characterized in that the formation of the a second through hole is blocked by the inlet-side annular valve seat in the first cutoff state communicated through hole. A valve chamber in which the inlet and outlet communicate with each other is formed in the casing, a valve ball with a flow hole is arranged in the valve chamber, an inlet-side annular valve seat is arranged on the inlet side of the valve ball, and an outlet-side annular valve seat is arranged on the outlet side In the ball valve that rotates the valve ball with a valve shaft that penetrates the casing in an airtight manner to communicate or block the inlet and the outlet, the inlet side annular valve seat penetrates from the valve ball contact surface to the casing contact surface. In the first shut-off state in which the through-hole is formed and one end of the casing is formed in the through-hole of the inlet-side annular valve seat and the other end is connected to the outside air, and the valve ball is shut off from the inlet and the outlet. A first through hole communicating with the flow hole and the outlet in a second shut off state in which the valve ball is rotated 180 degrees from the first shut off state through the communication hole and the inlet and the valve ball shuts off the inlet and the outlet; In the closed state Ball valve, characterized in that the formation of the a second through hole is blocked by the outlet-side annular valve seat in the first cutoff state communicated through hole.

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