JP2000320704A - Safety valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety valve a compact structure not requiring a stand-up pipe and a reaction force prevention part. SOLUTION: At least two ports 1, 2 and a connection channel 22 connecting the ports to each other, a safety valve channel 6 communicated with the connection channel 22 and a safety valve main body 4 arranged at the safety valve channel 6 are provided in a piping block 5. A port of fluid is discharged to the outside of the safety valve main body 4 from a clearance between a valve body 11 and valve seat 24 of the safety valve main body 4 through a fluid discharge channel 7 when pressure of fluid flowing between the ports 1, 2 exceeds a predetermined pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety valve which can be incorporated in a pipe without a riser and a component for preventing reaction force.

[0002]

2. Description of the Related Art Conventionally, various types of safety valves are known as safety valves attached to pipes. For example, as shown in FIG. 6, when the safety valve 101 is installed in the middle of the pipe 100, the riser pipe 102 is welded to the pipe 100,
There is a configuration in which a safety valve 101 is attached to the uppermost end of a riser 102.

[0003]

However, in the above-mentioned structure, when the safety valve 101 is operated, a reaction force is applied to a welded portion between the riser pipe 102 and the pipe 100, which is a root portion thereof, and the portion is broken. There are cases. In order to prevent this, it was necessary to attach a reaction force prevention component to the pipe 100.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems, and to provide a safety valve which can have a compact structure without the need for a riser and a component for preventing reaction force.

[0005]

In order to achieve the above object, the present invention is configured as follows.

According to a first aspect of the present invention, at least two
Two ports, a connecting path connecting the two ports,
The pressure of the fluid flowing between the two ports is equal to or higher than a predetermined pressure by providing the safety valve passage communicating with the connection path and the safety valve body disposed in the safety valve passage in one piping block. The present invention provides a safety valve characterized in that a part of the fluid is discharged from a gap between a valve body and a valve seat of the safety valve body to outside of the safety valve body via a fluid discharge path.

According to a second aspect of the present invention, the piping block has a rectangular parallelepiped shape, and the connection path connecting the at least two ports is disposed at one axial end of the piping block. The safety valve according to the first aspect, wherein the safety valve passage extends from the connection path toward the other end side in the axial direction of the safety valve, and the safety valve main body is disposed at an end of the safety valve passage.

According to a third aspect of the present invention, there is provided the safety valve according to the first or second aspect, wherein the two ports are connected in a straight line in the piping block.

According to a fourth aspect of the present invention, there is provided the safety valve according to the first or second aspect, wherein the two ports are connected in the piping block as an elbow pipe bent at 90 degrees.

According to a fifth aspect of the present invention, the two ports are arbitrarily selected from three or more ports arranged in the piping block and are connected by the connection path.
The safety valve according to any one of the aspects (1) to (4) is provided.

According to a sixth aspect of the present invention, a valve seat rotating member having the connection path and a valve seat for the valve body of the safety valve body is further rotatably provided in the piping block, and the two ports are provided. Is selected from three or more ports arranged on the piping block, the valve seat rotating member can be rotated to connect the selected two ports through the connection path of the valve seat rotating member. Any one of the first to fifth aspects, in which the two ports selected by rotating the valve seat rotating member and not connecting the two ports through the connection path of the valve seat rotating member while rotating the valve seat rotating member. A safety valve according to the above aspect is provided.

According to a seventh aspect of the present invention, there is provided the safety valve according to the sixth aspect, wherein the valve seat rotating member is rotatable from outside the piping block.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As shown in FIGS. 1 and 2, a safety valve according to a first embodiment of the present invention includes a connecting passage 22 for connecting an inlet port 1 and an outlet port 2 in a straight line, The safety valve passage 6 which crosses 90 degrees and communicates with the safety valve passage 4 and the safety valve main body 4 arranged in the safety valve passage 6 are substantially integrally provided in one piping block 5.

The piping block 5 has a rectangular parallelepiped shape,
One end of the piping block 5, for example, on the lower side in FIG.
The connection path 22 that connects the inlet port 1 and the outlet port 2 is arranged to penetrate. Internal thread portions 19 and 20 are formed on the inner peripheral surfaces of the inlet port 1 and the outlet port 2, respectively, so that plugs and connection pipes can be screwed in as necessary. I have. Instead of such a screw-in type, as shown in the left part of FIG. 1, a flange 17 connected to the pipe via an O-ring 18 for close contact with the pipe block 5 around the outside of the inlet port 1 is provided. May be fixed and connected by bolts 21. Further, the piping may be connected to each port by a wafer-type connection.

On the other hand, the safety valve passage 6 extends from the central portion of the connection passage 22 toward the other end of the piping block 5, for example, the upper side in FIG. The safety valve main body 4 is disposed in the safety valve main body storage hole 23 of the piping block 5 disposed in the above.

The safety valve body 4 is connected to the safety valve passage 6.
A disc-shaped valve body 8 which is always in close contact with an annular valve seat 24 at the upper end of the valve body, and closes the safety valve passage 6; 6
And a generally cylindrical valve body 9 having an H-shaped cross section and a ball 10 disposed on the upper surface of the valve body 9.
, A spring receiver 11 in contact with the ball 10, and the ball 10
A spring 12 for pressing the valve body 9 downward through the spring 12 and a spring retainer 11, and a spring retainer 13 disposed at an upper end of the spring 12.
And the safety valve body storage hole 23 of the piping block 5.
An adjusting screw member 14 which is screwed into a screw portion 15 formed on the inner peripheral surface of the upper end portion to adjust the position of the spring retainer 13;
It is composed of a lid 16 arranged outside the adjusting screw member 14. In FIG. 1, reference numeral 7 denotes a fluid discharge passage for discharging the fluid flowing from the connection passage 22 through the safety valve passage 6 when the safety valve functions and the valve body 8 separates from the valve seat 24. is there.

The safety valve according to the above configuration is incorporated in the middle of a pipe to which the safety valve is to be attached, and connects the inlet port 1 of the safety valve to the upstream pipe and connects the outlet port 2 of the safety valve to the downstream port. After being connected to the pipe, the safety valve body storage hole 23 of the pipe block 5 is formed.
The adjusting screw member 14 is appropriately screwed or loosened into the screw portion 15 in the inside to adjust the urging force of the valve body 11 by the spring 12, and then the safety valve body housing hole 23 of the piping block 5 is closed by the lid 16. close. With this arrangement, the pressure of the fluid flowing through the inlet-side pipe and the outlet-side pipe, that is, the pressure of the fluid flowing in the connecting path 22 connecting the inlet-side port 1 and the outlet-side port 2 is higher than a predetermined pressure. Then, due to the pressure of the fluid, the valve element 11 of the safety valve body 4 disposed at the end of the safety valve passage 6 communicating with the connection path 22 rises against the urging force of the spring 12 and rises. Away from the safety valve, a part of the fluid having the predetermined pressure or more is discharged from the fluid discharge passage 7 to the outside of the safety valve through the gap between the valve body 11 and the valve seat 24, and the pressure of the fluid is reduced. When the pressure of the fluid flowing in the pipe and the pipe on the outlet side, that is, the fluid flowing in the connecting path 22 connecting the inlet port 1 and the outlet port 2 becomes equal to or lower than the predetermined pressure, the valve is actuated by the urging force of the spring 12. When the body 8 contacts the valve seat 24, , At which point no fluid flows into the fluid discharge passage 7. In this way, when the pressure of the fluid flowing in the inlet-side pipe and the outlet-side pipe, that is, the fluid flowing in the connection path 22 that connects the inlet-side port 1 and the outlet-side port 2 becomes higher than the predetermined pressure, It functions as a safety valve, discharges fluid corresponding to excessive pressure, and connects the inlet-side pipe and the outlet-side pipe, that is, the connection path 22 that connects the inlet-side port 1 and the outlet-side port 2. Can be controlled such that the pressure of the fluid flowing through is always equal to or lower than the predetermined pressure.

According to the configuration of the above embodiment, the connection path 2 which is the pipe portion 3 in one rectangular parallelepiped pipe block 5 is provided.
2 and the relief valve, that is, the safety valve main body 4 are integrally disposed, so that a compact structure can be achieved and the handling can be facilitated.

The piping section 3 formed by the connection path 22 is used as a part of a straight pipe in which the inlet port 1 and the outlet port 2 are connected in a straight line. The safety valve can be easily and easily attached by directly interposing the pipe without the need for a riser and a reaction prevention component. That is, since the piping portion 3 and the safety valve main body 4 are integrally formed in the piping block 5, it is not necessary to separately provide a safety valve mounting seat on the piping, and the connection passage 22 of the piping block 5 is connected to the one side of the piping. Since it also serves as a department, extra expenses can be kept down and it can be handled with ease. Also, the piping section 3 and the safety valve body 4
Are integrated, the overall height from the piping section 3 to the safety valve body 4 is reduced, and the appearance is as if the safety valve body 4 is buried in the piping section 3, so the safety valve operates. The part receiving the reaction force when the
Since it is located at a very low position when viewed from above and is part of the piping, it is hardly affected by reaction force.

In general, when a safety valve is attached to a pipe, a primary side of a safety valve connected to a valve seat side is attached to the pipe, and then, when a secondary side of a safety valve connected to a valve body is attached, a primary side of the safety valve is attached. Excessive stress was applied to the side, and the valve seat was loosened. However, in the safety valve of the present embodiment, since the piping portion 3 and the safety valve body 4 are integrated, even if the secondary side of the piping portion 3 is attached after the primary side of the piping portion 3 is attached to the piping, Part 3
No excessive stress acts on the primary side of the valve seat, and the valve seat does not loosen.

Further, since the connection path 22 as the pipe portion 3 and the relief valve, that is, the safety valve body 4 are integrally disposed in the pipe block 5, the inlet port 1 and the outlet port of the connection path 22 of the pipe block 5 are integrated. A part of the pipe is screwed into the side port 2 and attached to the pipe block 5 by screwing, or the pipe is connected to the pipe block 5 by a flange 17 or the like.
The piping can be attached to the piping block 5 such that the piping is sandwiched by a wafer-type connection, and the method of attaching the piping portion 3 can be freely selected.

The present invention is not limited to the above embodiment, but can be implemented in various other modes.

For example, the present invention is not limited to the connecting path 22 in which the inlet side port 1 and the outlet side port 2 are connected in a straight line. By arranging it at a bent position, it can also be used as a part of a pipe as a bent pipe. For example, the inlet side port 1 and the outlet side port 2 can be used as an elbow tube bent at 90 degrees.

As another embodiment of the present invention, as shown in FIGS. 3 and 4, the inlet port and the outlet port may not be formed one by one, but may be formed in a plurality. For example, in FIGS. 3 and 4, in addition to the pair of ports corresponding to the inlet port 1 and the outlet port 2, another pair of ports 30, 3 with a 90 ° phase difference.
1, the valve seat member 36 in which the valve seat 24 is arranged at the upper end may be arranged so that the four ports 1, 2, 30, 31 can be appropriately selected. That is, the valve seat member 36 includes a through passage 36B penetrating in the axial direction, that is, the up and down direction, and an upper portion thereof also serves as the safety valve passage 6, and a connection passage 36A orthogonal to the through passage 36B, as shown in FIG. When connecting the inlet side port 1 and the outlet side port 2, the valve seat member 3
The phase of the valve seat member 36 is adjusted so that the inlet-side port 1 and the outlet-side port 2 are connected by the connecting path 36 </ b> A of No. 6 and fixedly disposed in the piping block 5.
In FIG. 3, when the port 30 and the port 31 are connected, the valve seat member 36 is connected so that the port 30 and the port 31 are connected by the connection path 36A of the valve seat member 36.
May be adjusted to a position where the phases are different by 90 degrees and fixedly arranged in the piping block 5. In FIG. 3, the lower end opening of the through passage 36B of the valve seat member 36 can also be used as another port 32, but in FIG. 3, the plug 33 is closed by screwing. However,
A total of 5 for this port 32 and ports 1, 2, 30, 31
Two ports can be appropriately selected from the ports and used as an inlet port and an outlet port. Note that FIG.
In the figure, 34 is a lower lid, and 35 is a bolt for fixing the lower lid 34 to the piping block 5. Also, 3
7, 38, and 39 are the outer surface of the valve seat member 36 and the valve seat member 36.
Is an O-ring for sealing the inner surface of the piping block 5 or the lid 34 on the lower side. In FIG. 3, 7A,
Reference numeral 7B denotes a fluid discharge passage for discharging the fluid flowing in from the connection path 36A through the safety valve passage 6 when the safety valve functions and the valve body 8 is separated from the valve seat 24.

In the embodiment shown in FIG. 3, the connecting path 36A of the valve seat member 36 is not limited to a straight line as shown in FIG. 3, but may be formed by bending an elbow at an angle of 90 degrees. For example, the inlet port 1 and the port 30 or 31, or the port 30 or 31 and the outlet port 2 may be connected.

The shape of the piping block 5 is not limited to a rectangular parallelepiped, but may be a planar polygon so that five or more ports can be arranged, and the number of selectable ports is increased to be used as a manifold. be able to.

Further, as shown in FIG. 5, as another embodiment of the present invention, the above-mentioned safety valve may function as a safety valve with a switching function. That is, the valve block 36 is used as the valve seat rotating member 50 as the valve seat member 36.
The valve seat rotating member 50 is appropriately rotated from the outside of the piping block 5 so as to function as a switching valve for changing the port connected by the connecting path 50A of the ball portion 50C of the valve seat rotating member 50. Can also. The valve seat rotating member 50 is provided within the piping block 5 so that the upper bearing 4
0, the lateral bearing 43, the lower bearing 49, and the upper and lower ball seats 41, 42 are rotatably arranged. The through passage 50B of the valve seat rotation member 50 penetrates the valve seat rotation member 50 in the axial direction, that is, the upward direction from the ball portion 50C, and also serves as the safety valve passage 6. In FIG. 5, reference numerals 61 and 62 denote seat retainers surrounding the inlet-side port 1 and the outlet-side port 2, respectively, and reference numerals 44 and 45 denote seat retainers 6 on the inlet and outlet sides.
Reference numeral 46 denotes an O-ring for seat retainer that seals the inner and inner surfaces of the piping block 5 and 62, 46 denotes an O-ring that seals the piping block 5 and the lower cover 34, and 47 denotes a valve seat rotating member 50 and the lower side. O-ring for sealing with the lid 34 of FIG. Reference numeral 48 denotes a hexagonal hole formed on the lower end face of the valve seat rotation member 50 and for coupling with a rotary tool when rotating the valve seat rotation member 50 from outside the piping block 5.

According to the safety valve shown in FIG. 5, even if the flow direction of the fluid is changed during the piping design, the safety valve manufacturer can rotate the valve seat rotating member 50 to connect appropriate ports. Thereby, it is possible to easily cope with a design change.

Further, by protruding the lower portion of the valve seat rotating member 50 to the outside of the safety valve and attaching an operation handle,
If the valve seat rotating member 50 can be easily rotated, it can be more conveniently used as a switching valve.

Further, the safety valve shown in FIG. 5 can stop the flow of the fluid by rotating the valve seat rotating member 50 to the side of the passage different from the passage for flowing the fluid. You may make it function. With this configuration, the flow of the fluid can be easily stopped at the time of maintenance, so that the maintenance is easy. In addition, the maintenance of the safety valve is generally performed by closing the main valve for flowing the fluid through the pipe and then removing the safety valve. However, the safety valve of FIG. 5 includes a valve seat rotating member 50 which is a ball cock. Therefore, while the flow of the fluid is stopped by rotating the valve seat rotating member 50, the safety valve can be removed from the upper part of the piping block 5 to perform the maintenance of the safety valve.

If the hexagonal hole 48 formed on the lower end surface of the valve seat rotating member 50 is formed as a hole or a projection having a shape corresponding to a special tool, the hexagonal hole 48 can be rotated only by the special tool. By doing so, a lock function can be provided without being rotated unnecessarily.

[0033]

According to the present invention, since the connecting passage and the safety valve main body are integrally disposed in one piping block, a compact structure can be achieved and the handling is easy. can do.

The connecting path is incorporated as a part of the pipe as a straight pipe in which the two ports are connected in a straight line or an elbow in which the two ports are bent at an arbitrary angle. The safety valve can be easily and easily attached by directly interposing the piping without the need for a riser and a counter-power prevention part. That is, since the piping section including the connection path and the safety valve main body are integrally formed in the piping block, there is no need to separately provide a safety valve mounting seat on the pipe, and the connection path of the piping block is a part of the pipe. Because it also serves as an extra, it is possible to suppress extra expenses and handle it with ease. In addition, the piping section and the safety valve body are integrated, and the overall height from the connection path to the safety valve body is reduced, and the appearance is as if the safety valve body is buried in the piping section of the connection path. As a result, the part receiving the reaction force when the safety valve is actuated is at a very low position when viewed from the piping, and because it is a part of the piping, it is hardly affected by the reaction force .

In general, when a safety valve is attached to a pipe, a primary side of a safety valve connected to a valve seat side is attached to the pipe, and then when a secondary side of a safety valve connected to a valve body is attached, a primary side of the safety valve is attached. Excessive stress was applied to the side, and the valve seat was loosened. However, the safety valve of the present invention, since the pipe portion and the safety valve body are integrated, even if the secondary side of the pipe portion is attached after attaching the primary side of the pipe portion to the pipe, No excessive stress is applied and the valve seat does not loosen.

In addition, since the connection path, which is a pipe section, and the safety valve body are integrally disposed in the pipe block, a part of the pipe is screwed into two ports of the connection path of the pipe block. The piping can be mounted on the piping block with a screw-in type, the piping can be mounted on the piping block with a flange, etc., or the piping can be mounted on the piping block by sandwiching it with a wafer-type connection, and the piping mounting method can be freely selected. .

Further, according to the present invention, if the two ports are arbitrarily selected from three or more ports arranged in the piping block and are connected by the connection path, the switching of the ports can be performed. It can also be used as a safety valve having a function as a switching valve that can be performed.

Further, if a valve seat rotating member having the connection path and a valve seat for the valve body of the safety valve body is further rotatably provided in the pipe block, the flow of the fluid during the pipe design can be improved. Even if the direction is changed, the safety valve manufacturer can easily cope with a design change by rotating the valve seat rotating member and connecting appropriate ports.

If the lower portion of the valve seat rotating member is projected outside the safety valve and an operation handle or the like is attached, the valve seat rotating member can be easily rotated, so that the switching valve can be used as a switching valve. Can be used more conveniently.

Further, the above-mentioned safety valve can function as a safety valve with a fluid closing function if the flow of the fluid can be stopped by rotating the valve seat rotating member to the side of the passage different from the passage through which the fluid flows. You can also. With this configuration, the flow of the fluid can be easily stopped at the time of maintenance, so that the maintenance is easy. In addition, the maintenance of the safety valve is generally performed by closing the main valve that allows the fluid to flow through the pipe and then removing the safety valve.However, in the above-described safety valve, the flow of the fluid is stopped by rotating the valve seat rotating member. Then, the safety valve can be removed from the upper part of the piping block to perform maintenance of the safety valve.

[Brief description of the drawings]

FIG. 1 is a sectional view of a safety valve according to an embodiment of the present invention.

FIG. 2 is a side view of the safety valve of FIG.

FIG. 3 is a sectional view of a safety valve according to another embodiment of the present invention.

FIG. 4 is a plan view of the safety valve of FIG. 3;

FIG. 5 is a sectional view of a safety valve according to another embodiment of the present invention.

FIG. 6 is an explanatory view of a state in which a conventional safety valve is attached to a pipe.

[Explanation of symbols]

1: Inlet port, 2: Outlet port, 3: Piping part,
4 Safety valve body, 5 Piping block, 6 Safety valve passage, 7, 7A, 7B Fluid discharge passage, 8 Valve body, 9 Valve body, 10 Ball, 11 Spring receiver, 12 Spring, 13
... Spring retainer, 14 ... Adjustment screw member, 15 ... Screw part, 16
... Lid, 17 ... Flange, 18 ... O-ring for close contact, 19 ...
Screw part, 20 ... screw part, 21 ... bolt, 22 ... connection path,
23: hole for storing the safety valve body, 24: valve seat, 30, 31,
32 port, 33 plug, 34 lower lid, 35
Bolt, 36 ... Valve seat member, 36A ... Through passage, 36B ...
Connecting roads, 37, 38, 39, 44, 45, 46, 47 ...
O-rings, 40, 43, 49 ... bearings, 41, 42
... ball seat, 48 ... hexagonal hole, 50 ... valve seat rotating member,
50A: connecting path, 50B: through passage, 50C: ball portion, 61, 62: seat retainer.

Claims (7)

[Claims] At least two ports (1, 2, 3)
0, 31, 32) and a connection path (22, 36A, 5) connecting the two ports.
0A) and a safety valve passage (6, 36B, 50) communicating with the connection passage.
B) and the safety valve body (4) disposed in the safety valve passage
When the pressure of the fluid flowing between the two ports becomes equal to or higher than a predetermined pressure, a part of the fluid is partially disposed in the valve body (11) of the safety valve body.
A safety valve characterized by being discharged from a clearance between the valve and a valve seat (24) to the outside of the safety valve body through a fluid discharge path (7). 2. The pipe block (5) has a rectangular parallelepiped shape, and the connection path (22) connecting the at least two ports is disposed at one axial end of the pipe block. The safety valve according to claim 1, wherein the safety valve passage (6) extends from the connection path toward the other end in the direction, and the safety valve body (4) is disposed at an end of the safety valve passage. 3. The safety valve according to claim 1, wherein said two ports are connected in a straight line as straight pipes in said piping block. 4. The safety valve according to claim 1, wherein the two ports are connected in the piping block as elbows bent at 90 degrees. 5. The safety valve according to claim 1, wherein the two ports are arbitrarily selected from three or more ports arranged in the piping block and are connected by the connection path. 6. A valve seat rotating member (50) having the connection path and having a valve seat for a valve body of the safety valve body.
Is further rotatably provided in the piping block. When the two ports are selected from three or more ports arranged in the piping block, the valve seat rotating member is rotated to rotate the selected 2 port. While the two ports are made connectable by the connection path of the valve seat rotation member, the two ports selected by rotating the valve seat rotation member are connected by the connection path of the valve seat rotation member. The safety valve according to any one of claims 1 to 5, wherein the safety valve can be in a non-connected state. 7. The safety valve according to claim 6, wherein the valve seat rotating member is rotatable from outside the piping block.