JPH08270829A - Shielding valve - Google Patents

Abstract

PURPOSE: To ensure a seal property, even it the number of a seal member is reduced by a simple structure, by storing a valve body and a valve seat in the inner space of a casing and also having the seal member surrounding an operation rod and separating the valve body from the operation rod for moving this. CONSTITUTION: In a shielding valve 22, a valve body 16 and a valve seat 10 are stored in the inner space 2 of a casing 1 and a thing equivalent to a conventional valve rod body is separated to an operation rod 11 and the valve body 16 and the valve body 16 is moved and positioned by the push-pressing force of the operation rod 11 and the energizing force of a compression spring 15. The position of the valve body 16 is changed by the movement of the operation rod 11 and the shielding valve 22 is opened/closed. In other words, usually the valve body 16 is push-pressed by the push-pressing force of the operation rod 11 and the energizing force of the compression spring 15 is released, meantime, when the push-pressing force of the operation rod 11 is released, the shielding valve 22 becomes in a closed state by the engaging force of the compression spring 15. Thus, as the valve body 16 is separated from the operation rod 11, the leakage of oil from the valve body 16 to the outside can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shut-off valve which is normally open and is used in a closed state infrequently.

[0002]

2. Description of the Related Art A control valve controlled by a change in oil pressure is used in an oil system such as a fuel circuit of a vehicle, a brake pipe, a lubricating circuit and the like. As such a control valve, for example, a check valve that is normally closed and opens when the pressure exceeds a certain value is known. However, the above-mentioned oil system may be required to have a shielding valve that manually stops the flow of oil such as oil as necessary, regardless of the oil pressure. For example,
This is a case where maintenance of equipment of oil system is performed. This shut-off valve is used, for example, in a normally open state, infrequently opened and closed, and in an infrequently closed state.

Further, not only for vehicles but also for general heat exchangers and the like, a shield used in a closed state which is always open and rarely used during maintenance without complicated opening and closing. Valve is required. As such a shutoff valve, the one shown in Japanese Utility Model Laid-Open No. 6-14634 (illustrated in FIG. 4) can be used.

In the drawing, a shutoff valve 101 is a valve box body 10.
2, the valve inner body 103, the valve lid body 104, and the cap 10
5 and 5. Inside the valve body 102, the inflow passage 10
6, an outflow passage 107, and a valve seat 108 are formed, and a valve lid mounting screw 109 is formed on the upper portion. The inner valve body 103 is a valve rod body 1 in which a screw turning groove 110 is formed in the upper end portion.
11 and the valve box body 10 is provided at the lower end of the valve rod body 111.
A valve contact surface 112 that contacts the second valve seat 108 is formed.

The valve cover 104 is the male screw 1 of the valve body 103.
A female screw 114 </ b> A screwed with the screw 13 has an inner valve body through hole 114 formed in an upper portion, and a valve lid mounting screw 109 is provided in a lower portion.
It has a screw 115 to be screwed into. A first O-ring 116 is mounted between the valve rod body 111 and the valve lid body 104,
A second O-ring 117 and a third O-ring 118 are mounted between the valve lid body 104, the valve box body 102 and the cap 105.

The shutoff valve 101 is used in a normally open state, and may be used in a closed state as needed. When the shutoff valve 101 is used in the open state, the valve seat 108 of the valve box body 102 and the valve contact surface 112 of the valve inner body 103
Are apart. When it is desired to close the shutoff valve 101, the cap 105 is manually closed as necessary by the valve lid 104.
After being removed from the valve body 108, the valve rod body 111 is tightened to bring the valve seat 108 of the valve box body 102 into contact with the valve contact surface 112 of the valve inner body 103.

[0007]

However, in the conventional shutoff valve 101, the valve box body 102 and the valve inner body 103 are provided.
The valve cover 104, the cap 105 and four parts are required, and the structure is complicated. And the valve contact surface 11
Since the valve rod body 111 in which the 2 is formed moves up and down, the valve rod body 11 is moved from the inflow passage 106 and the outflow passage 107.
1 between the valve box body 102 and the valve lid body 104, and
In order to prevent oil from leaking between the valve lid body 104 and the cap 105, a first O-ring 116 between the valve stem body 111 and the valve lid body 104 and a space between the valve lid body 104 and the valve box body 102 are provided. Second O-ring 117, valve lid 104 and cap 10
A third O-ring 118 between 5 is required.

Further, since the shutoff valve 101 has a complicated structure as described above, when the shutoff valve 101 in the open state is to be closed, the cap 105 and the valve cover 10 are closed.
The work of tightening the valve rod body 111 after removing from the No. 4 was required, and the switching work of the shutoff valve 101 was troublesome. The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a shutoff valve having a simple structure and capable of ensuring a sealing property even with a small number of sealing members.

[0009]

According to the first aspect of the present invention,
A casing having a head portion at one end and a bottom portion at the other end, a first port communicating with the inner space of the casing, a second port formed at a side portion on one end side of the casing, a second port of the casing, and an inner space. A valve seat disposed between the casing, an operating rod movably inserted into the internal space from the head of the casing, a sealing member mounted around the operating rod to prevent fluid leakage to the outside of the casing, and the casing A compression spring placed in the inner space of the casing and placed on the bottom, and a valve body located in the inner space of the casing, interposed between the compression spring and the valve seat, and normally pressed by the tip of the operating rod. It is characterized by having and.

According to a second aspect of the present invention, in the shut-off valve according to the first aspect, the operating rod is composed of a male screw portion and a head formed at one end of the male screw portion, and the seal member is of the operating rod. It is characterized in that it is mounted between the head and the end surface of the head of the casing.

[0011]

According to the present invention, the shut-off valve is normally in the open state, and in this state, the tip of the operating rod presses the valve body against the biasing force of the compression spring. Is separated from the valve seat, and there is a gap between the valve body and the valve seat. Therefore, the first port and the second port are in communication with each other through the internal space and the gap between the valve body and the valve seat, and the fluid flows between the first port and the second port.

When the operation rod is moved away from the head of the casing, the shutoff valve is closed. That is, the tip of the operating rod separates from the valve body, and the compression spring presses the valve body onto the valve seat, so that the valve body sits on the valve seat, and the valve body closes the valve seat. Therefore, no fluid flows between the first port and the second port. According to the second aspect of the invention, since the operating rod is composed of the male screw portion and the head portion formed at one end of the male screw portion, the movement of the operating rod is performed by the screw action of the male screw portion. . Further, since the seal member is mounted between the head portion of the operation rod and the end surface of the head portion of the casing, the seal member prevents the fluid from leaking to the outside of the casing.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. An example in which the shut-off valve according to the embodiments of the present invention is attached to a fuel circuit of a vehicle will be described with reference to FIGS. 1 to 3. In FIG. 1, reference numeral 1 is a casing, and the casing 1 has a cylindrical inner space 2 and one end 1
A head portion 3 is formed on A, and a bottom portion 4 is formed on the other end 1B.

A first port 5 is formed in the bottom 4 of the casing 1, and the first port 5 communicates with the internal space 2 of the casing 1. Second ports 6 and 6 are formed in the side portion 1C on the one end 1A side of the casing 1 so as to face the direction orthogonal to the axial direction of the casing 1.

A communication passage 7 is formed between the second ports 6 and 6 of the casing 1 and the internal space 2, and a step portion 8 is formed between the communication passage 7 and the internal space 2 of the casing 1. Then, the bottomed tubular body 9 is disposed in the internal space 2 by contacting the step portion 8, and the bottomed tubular body 9 has a bottom portion 9B having a hole 9A formed in the center and a body portion 9C continuous to the bottom portion 9B. The circular edge portion at the tip of the body portion 9C constitutes the valve seat 10. The bottomed tubular body 9 is fixed to the casing 1 in a state where the bottom portion 9B of the bottomed tubular body 9 contacts the step portion 8 and the body portion 9C is fitted to the inner peripheral wall surface 1D of the casing 1.

A female screw portion 3A is formed in the center of the head portion 3 of the casing 1, and a male screw portion 11A of an operating rod 11 made of a bolt is screwed into the female screw portion 3A. Operating rod 11
11C is inserted into the internal space 2. Operating rod 1
Reference numeral 1 has a head portion 11B formed at one end of a male screw portion 11A, and a seal member 14 made of a gasket is mounted between the head portion 11B of the operating rod 11 and the end surface 13 of the head portion 3 of the casing 1. . The seal member 14 prevents oil from leaking from the casing 1.

A compression spring 15 is provided in the inner space 2 of the casing 1.
And the compression spring 15 is placed on the bottom 4. A spherical valve element 16 is arranged in the internal space 2 of the casing 1, and the valve element 16 includes one end 15A of the compression spring 15 and the valve seat 10.
Is intervened between. In the shutoff valve 22 according to the present embodiment, for example, the first port 5 is used as an inlet and the second port 6 is used as an outlet, which is normally in an open state, but is operated, for example, when performing maintenance of equipment. It will be in the closed state.

The mounting state of the shutoff valve 22 will be described with reference to FIG. In the figure, a connector 19 is provided on a component 17 composed of a cylinder head via a first gasket 18.
Is placed. The connector 19 is a connector body 19A
A hole 19B penetrating the connector body 19A, an annular groove 19C formed in the hole 19B, and a connection hole 19 communicating with the annular groove 19C and opening on the side surface of the connector body 19A.
D and.

A shielding valve 22 is placed on the upper surface of the connector body 19A via a second gasket 20 and a washer 21.
The casing 1 of the shutoff valve 22 is fixed to the screw hole 17A of the component 17. A pipe 23 is connected to the connection hole 19D of the connector 19. Oil is screw hole 1 of component 17
7A → first port 5 of shutoff valve 22 → second ports 6 and 6 of shutoff valve 22 → connecting hole 19D of connector 19 → pipe 23
Flows.

However, in this embodiment, the shutoff valve 2
2 is attached to, for example, a fuel circuit of a vehicle and is normally in an open state, but is closed by being operated during maintenance. The shutoff valve 22 in the open state is shown in FIG.
As shown in the figure, the tip 11C of the operating rod 11 is the compression spring 1
Since the valve body 16 is pressed against the biasing force of 5, the valve body 16 separates from the valve seat 10 and a gap C is formed between the valve body 16 and the valve seat 10. Therefore, the first port 5 and the second port 6 are in communication with each other through the internal space 2, the gap C between the valve body 16 and the valve seat 10 and the communication passage 7, and the oil is transferred from the first port 5 to the second port 6. Will be in a flowing state. Then, the oil tries to leak to the outside of the casing 1 through the outer peripheral surface of the operating rod 11, but the leak is prevented by the seal member 14.

By making the diameter of the first port 5 of the casing 1 an appropriate diameter, the first port 5 can be provided with a function as a flow control valve. The shutoff valve 22 in the closed state is shown in FIG. The operation rod 11 is moved by the screw action of the male screw portion 11A of the operation rod 11,
The operation rod 11 is pulled up in the drawing. As a result, the tip 11C of the operating rod 11 separates from the valve body 16, the compression spring 15 presses the valve body 16 onto the valve seat 10, the valve body 16 is seated on the valve seat 10, and the valve body 16 causes the valve seat 10 to move. Is closed. Therefore, the internal space 2 and the communication passage 7 are shut off, and no oil flows between the first port 5 and the second port 6.

According to the above configuration, the shutoff valve 22 is
A valve body 16 and a valve seat 10 are provided in the inner space 2 of one casing 1.
In order to change the position of the valve body 16, the one corresponding to the conventional valve rod body is separated into the operating rod 11 and the valve body 16, and the valve body 16 pushes the operating rod 11 and compresses the compression spring 15. It is moved and positioned by the urging force. The position of the valve element 16 is changed by the movement of the operation rod 11, and the shutoff valve 22 is opened and closed. That is, the valve body 16 is normally pressed by the pressing force of the operating rod 11 to release the urging force of the compression spring 15, and when the pressing force of the operating rod 11 is released, it is shielded by the urging force of the compression spring 15. The valve 22 is closed.

As described above, since the valve body 16 and the operating rod 11 for moving the valve body 16 are separated, the seal member 1
In combination with the function of 4, the oil can be prevented from being transmitted from the valve body 16 to the operating rod 11 and leaking out of the casing 1.
Therefore, since the shut-off valve 22 that is in the normally open state and is in the closed state when necessary has the above-described structure, it is possible to have a simple structure while ensuring the sealing property and to mount the seal member. You can do it in one place.

Further, the shutoff valve 22 can be provided only by moving the operating rod 11.
Since it can be opened and closed, switching work of opening and closing the shutoff valve 22 can be facilitated. In this embodiment, the operating rod 11 is composed of a male screw portion 11A and a head portion 11B formed at one end of the male screw portion 11A, and the seal member 14 is a head portion 11B of the operating rod 11 and the casing 1. Although it is mounted between the heads 3, the operation rod is composed of a rod with a smooth outer peripheral surface,
A seal member composed of an O-ring can be attached to the outer peripheral surface of the rod.

Further, in this embodiment, the casing 1
Although the first port 5 communicating with the internal space 2 is formed in the bottom portion 4 of the internal space 2 on the side of the other end 1B of the casing 1.
It is also possible to form the first port on the side portion 1C communicating with the first port. Further, in the present embodiment, the oil is the screw hole 17A of the component 17, the first port 5 of the shutoff valve 22, the second ports 6 and 6 of the shutoff valve 22, and the connection hole 1 of the connector 19.
The oil flows from 9D to the pipe 23, but oil can also flow in the opposite direction. That is, the oil is pipe 23
→ Connection hole 19D of connector 19 → second ports 6 and 6 of shutoff valve 22 → first port 5 of shutoff valve 22 → screw hole 17A of component 17 can be used.

Further, in the present embodiment, the valve body 16 is spherical, but the shape is not limited to such a shape, and it may be a shape other than a sphere. The function of the valve body 16 is the valve seat 10.
Is a block that opens and closes, and may be a block having a portion that comes into contact with the compression spring 15 and the valve seat 10. and again,
In the present embodiment, an example in which the shutoff valve is attached to the fuel circuit of the vehicle to perform maintenance of the equipment has been described, but the present invention is not limited to such a usage mode and can be used as follows.

(1) When a shielding valve is attached to a brake pipe, a lubrication circuit, etc. of a vehicle, and various components are maintained by closing the shielding valve (2) A brake pipe, a lubrication circuit, a fuel circuit, etc. of the vehicle When a shielding valve is installed in the oil system and the shielding valve is closed to prevent the oil from draining when the oil system is damaged in a vehicle accident (3) The shielding valve is installed in the oil system and the oil burns in a vehicle fire. When shutting off the oil combustion by shutting off the oil cutoff valve (4) When installing a shutoff valve in the fuel circuit of the vehicle and closing the shutoff valve to shut off the fuel circuit to prevent mischief (5) Multiple fuel tanks are installed in the fuel circuit, and a shield valve is installed for each fuel tank. Normally, one or more shield valves are opened and used, but the shield valve is closed to switch the fuel tank. When using (6) When the shield valve is used as a flow control valve (7) The shield valve is attached to the piping system of the heat exchanger of the nuclear power unit, and when the thin tube of the heat exchanger is cracked, the shield valve is closed. In the case where the heat exchanger is maintained, and further, in the present embodiment, oil is taken as an example of the fluid, and the case where the shielding valve is attached to the oil system is described. You can also wear it.

[0028]

According to the first aspect of the present invention, the shut-off valve has a seal member for accommodating the valve body and the valve seat in the inner space of one casing and surrounding the operating rod. Since the operation rod for moving is separated, it is possible to prevent fluid from being transmitted from the valve body to the operation rod and leaking out of the casing.

Therefore, the shut-off valve which is normally open and closed when necessary can have a simple structure while ensuring the sealing property, and the sealing member can be installed in only one place. Further, since the shutoff valve can be opened and closed only by moving the operation rod, the switching work of opening and closing the shutoff valve can be facilitated.

According to the second aspect of the present invention, since the operating rod is composed of the male screw portion and the head portion formed at one end of the male screw portion, the movement of the operating rod is controlled by the screw of the male screw portion. The flow rate of the fluid can be adjusted by finely adjusting the position of the operating rod to change the position of the valve body. Moreover, since the seal member is mounted between the head of the operating rod and the end face of the head of the casing, the seal member can prevent fluid from leaking to the outside of the casing.

[Brief description of drawings]

FIG. 1 is a sectional view of a shutoff valve according to an embodiment of the invention described in claims 1 and 2.

FIG. 2 is an explanatory view showing an example of a mounting state of the shutoff valve.

FIG. 3 is an explanatory view of a usage state of the shutoff valve.

FIG. 4 is a cross-sectional view of a conventional shutoff valve.

[Explanation of symbols]

 1 Casing 1A One end 1B The other end 1C Side part 2 Internal space 3 Head part 4 Bottom part 5 1st port 6 2nd port 10 Valve seat 11 Operating rod 11A Male screw part 11B Head part 11C Tip 13 End surface 14 Sealing member 15 Compression spring 16 Valve body 22 Shut-off valve

Claims (2)

[Claims] 1. A casing having a head portion at one end and a bottom portion at the other end, a first port communicating with an internal space of the casing, a second port formed at a side portion on one end side of the casing, and a first casing A valve seat arranged between the two ports and the internal space, an operation rod inserted movably from the head of the casing into the internal space, and mounted around the operation rod to prevent leakage of fluid to the outside of the casing. The seal member, the compression spring placed in the inner space of the casing and placed on the bottom, and the compression spring located in the inner space of the casing and interposed between the compression spring and the valve seat, are normally attached to the tip of the operating rod. A shutoff valve, comprising: a valve body that is pressed. 2. The operating rod comprises a male screw portion and a head formed at one end of the male screw portion, and the seal member is mounted between the head of the operating rod and the end face of the casing head. The shutoff valve according to claim 1, wherein the shutoff valve is provided.