JPH04362380A - High pressure valve device - Google Patents

Abstract

PURPOSE:To shut off fluid flow automatically at the time of a high pressure line pipe being damaged by providing a pressure chamber for letting the primary pressure of a throttle means act upon a valve body and letting the valve body perform switching action against an elastic body at the time of differential pressure between the primary pressure and the secondary pressure rising over a specified value. CONSTITUTION:This high pressure valve device is provided with a valve housing 1 having a valve seat 3 in a fluid passage 11, a valve body 5 performing switching action to the valve seat 3. An orifice 81 to the valve seat 3 is provided on the inlet side of the fluid passage 11, and an elastic body 7 is provided to energize the valve body 5 constantly in the opening direction. The valve housing 1 is provided with a pressure chamber 6 communicated with the primary side of the orifice 81 so as to let the primary pressure of the orifice 81 act upon the valve body 5 and to let the valve body 5 perform closing action against the elastic body 7 at the time of differential pressure between the primary pressure and the secondary pressure rising over a specified value. Accordingly, when the flow of the fluid passage 11 is increased due to the damage of the pipe of a high pressure line so as to make differential pressure large, fluid flow can be shut off by the valve body 5.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention can be installed in a high-pressure line through which high-pressure water flows, and can be used in cases where the pipe of the high-pressure line is damaged, etc.
The present invention relates to a high-pressure valve device that can automatically shut off the flow of fluid in this high-pressure line.

0002

[Prior art] Generally, the pressure is 1000Kgf/cm 2
A flexible high-pressure hose is used in the high-pressure line between the pump device and a nozzle that injects high-pressure water exceeding No valve system was provided to automatically shut off fluid flow in the high pressure hose.

0003

[Problem to be Solved by the Invention] However, when the pressure of the high pressure line exceeds 1000 Kgf/cm2, of course, if the high pressure line pipe is a high pressure hose,
Even if it is a metal pipe, its lifespan is very short, and the high pressure hose or metal pipe will break after a short period of use. That is, the high-pressure hose or metal pipe is used in an area where the safety factor in terms of the strength of the material is small, so it is likely to break after a short period of use. Conventionally, the high-pressure hose is replaced after a short period of use, but if the high-pressure hose is damaged before it is replaced, high-pressure water will be sprayed outside from the damaged location. Not only could it hit other workers nearby, but it also caused the problem of wasting water.

[0004] The present invention was invented in view of the above points.
An object of the present invention is to provide a valve device that can automatically shut off fluid flow in a high-pressure line when the pipe of the high-pressure line is damaged.

[0005]

[Means for Solving the Problems] Accordingly, the present invention includes a valve housing 1 having a valve seat 3 in a fluid passage 11, a valve body 5 that opens and closes with respect to the valve seat 3, and a valve body 5 that opens and closes with respect to the valve seat 3. 3, a throttle means 8 is provided on the inlet side of the fluid passage 11, and an elastic body 7 is provided that always urges the valve body 5 in the open direction, and the valve housing 1 is provided with a throttle means 8 on the primary side and The primary pressure P1 of the throttle means 8 is communicated with the valve body 5, and the primary pressure P1 and the secondary pressure P2 of the throttle means 8 are communicated with each other.
A pressure chamber 6 is provided that causes the valve body 5 to close against the elastic body 7 when the pressure difference between the valve body and the valve body increases to a predetermined value or more.

[0006] The valve housing 1 also includes a fluid passage 1.
A valve chamber 14 is provided in which the inlet side passage 11a and the outlet side passage 11b are opened, and the inlet side passage 11a is opened in the valve chamber 14.
and the outlet side passage 11b, and an inlet side passage 1 is provided on the outer periphery.
1a, a holding cylinder 4 is provided inside which holds a valve body 5 and an elastic body 7, and has a pressure chamber 6 on the back side of the valve body 5. Preferably, an orifice 81 that communicates the communication passage 41 with the outlet side passage 11b and a communication hole 43 that communicates the communication passage 41 with the pressure chamber 6 are provided.

[0007]

[Operation] When the valve housing 1 is connected to the inlet side of a high pressure line and the flow rate flowing through the fluid passage 11 of the valve housing 1 is a normal flow rate set by the diameter of the nozzle, etc., the throttle means 8 A pressure difference such as primary pressure P1 > secondary pressure P2 is generated between the primary side and the secondary side, and the primary pressure P1 is increased in the pressure chamber 6 communicating with the primary side of the throttle means 8. 5 and the acting force acting on the valve body 5 corresponds to the secondary pressure P2 acting on the valve body 5 on the secondary side of the throttle means 8 and the force of the elastic body 7 to reach an equilibrium state. Thus, the open state of the valve body 5 is maintained. If a part of the pipe in the high-pressure line is damaged on the outlet side of the valve device, the high-pressure water in the high-pressure line is injected to the outside from a normal outlet such as a nozzle and the damaged location. Therefore, the flow rate of this fluid passage 11 increases, and the differential pressure between the primary pressure P1 and the secondary pressure P2 of the throttle means 8 increases to a predetermined value or more. Due to the pressure increase, the acting force acting on the valve body 5 within the pressure chamber 6 increases, and this acting force increases the secondary pressure P2 acting on the valve body 5 on the secondary side of the throttle means 8 and the elastic body 7. This overcomes the force and causes the valve body 5 to close. By this closing operation of the valve body 5, the flow of fluid in the fluid passage 11 can be automatically shut off.

[0008] Further, a valve chamber 14 is provided in the valve housing 1,
In this valve chamber 14, the inlet side passage 11a and the outlet side passage 11b are blocked off, and a communication passage 41 communicating with the inlet side passage 11a is provided in the outer peripheral part, and the valve body 5 and the elastic body 7 are held inside, A holding cylinder 4 in which a pressure chamber 6 is provided is installed on the back side of the valve body 5, and the holding cylinder 4 includes an orifice 81 that communicates the communication passage 41 with the outlet side passage 11b, and the communication passage 4.
By providing a communication hole 43 that communicates the valve body 5 and the elastic body 7 with the pressure chamber 6, the valve body 5 and the elastic body 7 can be held in the holding cylinder 4 to form a unit. 6, a communication passage 41, and a communication hole 43, it is easy to process the orifice 81, the pressure chamber 6, etc., and the assembly and maintenance inspection of the valve body 5 etc. into the valve housing 1 are easy. It can be done easily.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 denotes a valve housing having a fluid passage 11 in its center.
A ring having the fluid passage in the center, consisting of first and second blocks 12 and 13 connected by a tightening screw 2, and having a through hole communicating with the fluid passage 11 between these blocks 12 and 13. By inserting the shaped valve seat 3 and removing the tightening screw 2, each block 12, 13 is removed.
The valve seat 3 can be separated from the valve seat 3. Note that the valve seat 3 may be integrated with the second block 13, for example.

Fluid passage 11 in the valve housing 1
The inlet side to the valve seat 3, that is, the first block 12
Inside, there is provided an oblong valve chamber 14 in which an inlet side passage 11a and an outlet side passage 11b of the fluid passage 11 are opened. A holding cylinder 4 consisting of a closing part 4b that closes the opening is removably installed inside the holding cylinder 4, and one end of this holding cylinder 4 is brought into contact with the valve seat 3, and the other end is brought into contact with the inner surface of the valve chamber 14, respectively. The inlet side passage 11a and the outlet side passage 11b are blocked by the holding cylinder 4, and the holding cylinder 4 is formed to have a smaller diameter than the inner diameter of the valve chamber 14, so that the outer circumference of the holding cylinder 4 is An annular communication passage 41 is provided, and this communication passage 41 is communicated with the entrance side passage 11a via a through hole 42 formed in the closing portion 4b. A large diameter portion 4c that fits into the inner peripheral surface of the valve seat 3 is provided at one end of the closing portion 4b of the holding cylinder 4, and the large diameter portion 4c allows the holding cylinder 4 to enter the valve chamber 14. I'm trying to keep it.

A valve body 5 that opens and closes with respect to the valve seat 3 is freely held in this holding cylinder 4, and there is a gap between the outer circumferential surface and back surface of this valve body 5 and the inner surface of the holding cylinder 4. A pressure chamber 6 is provided in the pressure chamber 6, and an elastic body 7 made of a coil spring is provided on the outer circumferential side of the valve body 5 in the pressure chamber 6 to bias the valve body 5 in the open direction at all times. The shaped portion 4a includes an orifice 81 of the throttle means 8 that communicates the communication passage 41 with the outlet side passage 11b, and the communication passage 41.
and a small diameter communication hole 43 that communicates with the pressure chamber 6,
The orifice 81 causes a primary pressure P1 to act on the communication passage 41, which is the primary side of the orifice 81, and
A secondary pressure P2 acts on the outlet side passage 11b, which is the secondary side, and the relationship between the primary pressure P1 and the secondary pressure P2 is as follows.
The primary pressure P1 is set to be greater than the secondary pressure P2, and the primary pressure P1 is applied to the pressure chamber 6 through the communication hole 43. A plurality of orifices 81 and communication holes 43 are provided at predetermined intervals in the circumferential direction.

The pressure difference between the primary pressure P1 and the secondary pressure P2 is caused by the force exerted by the pressure in the pressure chamber 6 on the back surface of the valve body 5 and the force exerted by the pressure in the pressure chamber 6 on the back side of the valve body 5 on the secondary side of the orifice 81. The pressure difference is set so that the secondary pressure P2 acting on the valve element 5 and the force of the elastic body 7 correspond to each other and reach an equilibrium state, resulting in a pressure difference that can maintain the open state of the valve element 5. This differential pressure can be accurately determined by selecting the diameter of the orifice 81.
Moreover, it can be easily set.

Further, a ring-shaped damper 9 having an outer circumferential surface facing the inner circumferential surface of the holding cylinder 4 at a slight distance is provided on the outer circumference of the back side of the valve body 5, so that the pressure chamber 6 The amount of fluid in the elastic body side chamber 6a flowing into the valve body back side chamber 6b is suppressed to slow down the movement of the valve body 5 in the closing direction due to the fluid pressure in the valve body back side chamber 6b, and the fluid passage 11
The valve is closed slowly to prevent water hammer from occurring.

Further, in FIG. 1, reference numeral 10 denotes a sealing material for the valve body 5.

The high-pressure valve device configured as described above is connected to the inlet side of the high-pressure line between the pump device and a nozzle for injecting high-pressure water, and is configured to control the flow rate flowing through the fluid passage 11 of the valve housing 1. is the normal flow rate set by the nozzle diameter etc., the orifice 81
Communication passage 41 which becomes the primary side and outlet side passage 1 which becomes the secondary side
1b, the primary pressure P1 of the communication passage 41 is the outlet side passage 1
A pressure difference larger than the secondary pressure P2 of 1b is generated, and the fluid at the primary pressure P1 enters the pressure chamber 6 which communicates with the communication passage 41 through the communication hole 43, and this The primary pressure P1 acts on the back side of the valve body 5, and the force acting on the valve body 5 and the orifice 8
The secondary pressure P2 acting on the valve body 5 on the secondary side of the valve body 1 and the force of the elastic body 7 correspond to each other and reach an equilibrium state, and the open state of the valve body 5 is maintained. The desired work can be performed by injecting the liquid to the outside from the nozzle or the like.

[0016] If a part of the pipe in the high pressure line is damaged on the outlet side of the valve device,
Since the high-pressure water in the high-pressure line is injected to the outside from a normal outlet such as a nozzle and the damaged location, the flow rate of this fluid passage 11 increases. Multiple nozzles, etc. are connected through the high pressure line of the The differential pressure between the primary pressure P1 and the secondary pressure P2 of 81 is increased to a predetermined value or higher. Due to this increase in pressure difference, the pressure chamber 6
The acting force acting on the back surface of the valve body 5 increases in the valve body back side chamber 6b, and this acting force increases the secondary pressure P2 acting on the valve body 5 on the secondary side of the orifice 81 and the force of the elastic body 7. The valve body 5 overcomes this and closes the valve body 5 as shown in FIG. 2, closing the valve seat opening of the valve seat 3. Since the flow of fluid in the fluid passage 11 is automatically cut off by the closing operation of the valve body 5, it is possible to stop fluid from being injected from the damaged part of the high pressure line. Safety can be improved.

Further, the valve body 5 and the elastic body 7 are held in the holding cylinder 4.
The holding cylinder 4 has an orifice 81, a pressure chamber 6, a communication passage 41, and a communication hole 43.
Since the orifice 81 and the pressure chamber 6 are provided, the orifice 81, the pressure chamber 6, etc. can be easily processed, and they can also be easily assembled into the valve housing 1.

In the embodiment described above, the diameter of the orifice 81 cannot be changed without replacing the holding cylinder 4, but the diameter of the orifice 81 can be adjusted as desired using the adjusting screw 20 as shown in FIG. It may be possible to do so. Since the valve device shown in FIG. 3 is basically the same as the valve device shown in FIG. 1, only the differences will be described.

In FIG. 3, the outer diameter of both ends of the holding cylinder 4 except for the middle part is formed to be smaller than the inner diameter of the valve chamber 14, and an annular ring is formed on the outer periphery of the holding cylinder 4. Communication path 4
1 and 44, one of the communicating passages 41 is communicated with the inlet side passage 11a through the through hole 42, and the other communicating passage 44 is communicated with the inlet side passage 11a through a passage 45 formed in the cylindrical portion 4a. and communicates with the outlet side passage 11b, while the first
The block 12 is provided with a bypass passage 15 communicating with each of the communication passages 41 and 44, and the bypass passage 15 is provided with an orifice 81, and the first block 12 is provided with an adjustment screw 20 for adjusting the diameter of the orifice 81. Screw on,
By operating this adjusting screw 20, the diameter of the orifice 81 is adjusted, so that the differential pressure between the primary pressure P1 and the secondary pressure P2 can be adjusted. Further, since the operation in the case of FIG. 3 is the same as that in FIG. 1, the explanation thereof will be omitted.

[0020]

As described above, the present invention includes a valve housing 1 having a valve seat 3 in a fluid passage 11, and a valve body 5 that opens and closes with respect to the valve seat 3. A throttling means 8 is provided on the inlet side of the fluid passage 11, and an elastic body 7 is provided which normally urges the valve body 5 in the open direction, and the valve housing 1 is connected to the primary side of the throttling means 8 to The primary pressure P1 of the throttling means 8 is applied to the valve body 5, and when the differential pressure between the primary pressure P1 and the secondary pressure P2 of the throttling means 8 increases to a predetermined value or more, the valve body 5 is applied to the elastic body 7. Since the pressure chamber 6 is provided to close the valve housing 1
When the flow rate flowing through the fluid passage 11 is the normal flow rate set by the diameter of the nozzle, etc., the valve body 5 can be kept open and high pressure water can flow, while the high pressure line pipe When the flow rate of the fluid passage 11 increases due to damage, the primary pressure P1 and the secondary pressure P2 of the restricting means 8
When the pressure difference between the valve body and the valve body increases to a predetermined value or more, the valve body 5 can be automatically closed against the elastic body 7, and the flow of fluid in the fluid passage 11 can be automatically shut off. This is possible. Therefore, the high-pressure water sprayed to the outside from the damaged part of the high-pressure line pipe can be immediately stopped, safety can be improved, and water waste can be reduced.

[0021] Further, the valve housing 1 includes a fluid passage 1.
A valve chamber 14 is provided in which the inlet side passage 11a and the outlet side passage 11b are opened, and the inlet side passage 11a is opened in the valve chamber 14.
and the outlet side passage 11b, and an inlet side passage 1 is provided on the outer periphery.
1a, a holding cylinder 4 is provided inside which holds a valve body 5 and an elastic body 7, and has a pressure chamber 6 on the back side of the valve body 5. By providing an orifice 81 that communicates the communication passage 41 with the outlet side passage 11b and a communication hole 43 that communicates the communication passage 41 with the pressure chamber 6, the valve body 5 and the elastic body 7 are connected to each other in a holding cylinder. 4 to form a unit, and since the holding cylinder 4 is provided with the orifice 81, the pressure chamber 6, the communication passage 41, and the communication hole 43, the orifice 81 and the pressure chamber 6
It is easy to process the valve body 5, etc., and it is also easy to assemble the valve body 5 and the like into the valve housing 1 and to perform maintenance and inspection.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a valve device according to the invention.

FIG. 2 is an explanatory diagram showing the same operating state.

FIG. 3 is a sectional view showing another embodiment.

[Explanation of symbols]

1 Valve housing 11 Fluid passage 11a Entrance side passage 11b Exit side passage 14 Valve chamber 3 Valve seat 4 Holding cylinder 41 Communication path 43 Communication hole 5 Valve body 6 Pressure chamber 7 Elastic body 8 Squeezing means 81 Orifice

Claims (2)

[Claims] 1. A valve housing 1 having a valve seat 3 in a fluid passage 11, and a valve body 5 that opens and closes with respect to the valve seat 3, the valve housing 1 having a valve seat 3 on the inlet side of the fluid passage 11 with respect to the valve seat 3. A throttle means 8 is provided, and an elastic body 7 that always biases the valve body 5 in the open direction is provided in the valve housing 1 and communicates with the primary side of the throttle means 8 so that the throttle means 8 is connected to the valve body 5. The primary pressure P1 of the throttle means 8 is applied.
and a pressure chamber 6 that closes the valve body 5 against the elastic body 7 when the differential pressure between the pressure and the secondary pressure P2 increases to a predetermined value or more.
A valve device characterized by being provided with. 2. The valve housing 1 is provided with a valve chamber 14 in which the inlet side passage 11a and the outlet side passage 11b of the fluid passage 11 open, and the inlet side passage 11a and the outlet side passage 11b are opened in the valve chamber 14. A holding cylinder 4 that is closed off and has a communication passage 41 in its outer circumference that communicates with the inlet passage 11a, holds a valve body 5 and an elastic body 7 inside, and has a pressure chamber 6 on the back side of the valve body 5. is installed inside the holding cylinder 4, and the communication passage 41 is connected to the holding cylinder 4.
2. The high-pressure valve device according to claim 1, further comprising: an orifice 81 that communicates with the outlet side passage 11b; and a communication hole 43 that communicates the communication passage 41 with the pressure chamber 6.