JP3256874B2 - Multi-function pressure regulating valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-function pressure regulating valve having a function of a plurality of types of valves such as an unload valve, a pressure regulating valve and a safety valve.

[0002]

2. Description of the Related Art As shown in FIG. 1, a discharge pipe 1 of a high-pressure descaling apparatus for spraying high-pressure water to remove an oxide film from the surface of a rolling steel material usually has a nozzle header 3 during rolling of the steel material 2 as shown in FIG. The unload valve 5 supplies high-pressure water to the feed pipe and returns the high-pressure water to the bypass pipe 4 after rolling, the pressure regulating valve 6 sets the working pressure of the discharge pipe 1, and the strength of the discharge pipe system in terms of safety. A safety valve 7 for assurance and a running-in valve 9 for gradually increasing the discharge pressure of the high-pressure pump 8 when the bearings, valves, etc. of the high-pressure pump 8 are replaced are provided.

At the end of the bypass pipe 4 of the unload valve 5, a multi-stage orifice 10 for preventing the occurrence of cavitation in the unload valve 5 when the unload valve 5 is unloaded is provided. I have.
In the figure, reference numeral 12 denotes an electromagnetic air switching valve for operating the unload valve 5, 13 denotes a heat radiation type temperature sensor, and 11 denotes a solenoid of the electromagnetic air switching valve 12 based on a signal sent from the temperature sensor. This is a control circuit for exciting or demagnetizing.

[0004] Further, to briefly explain each part, the unloading valve 5 has a single suction port 14 as shown in FIG.
A cylindrical valve box 17 having two discharge ports 15 and 16 on the side, and closing one of the two discharge ports 15 and 16 (the upper one in the figure); An annular seal member 19, 19, 19 that fits into the inside of the valve housing 17 and partitions the inside of the valve box 17 into three valve chambers 18, 18, 18 , and slides on the inner wall of the seal member 19 , 19 , 19. The spool 20 includes a cylindrical spool 20 that is movably fitted, and an air cylinder device 22 that reciprocates the spool 20.

When the spool 20 is at the lower limit position shown in FIG. 7, the unload valve 5 connects the suction port 14 to the lower discharge port 15 through slit-like ports 23 provided on the spool. When the high-pressure water is discharged to the bypass pipe 4 by conducting, and the spool 20 moves to the upper limit position in the figure, the high-pressure water is supplied to the nozzle header 3 because the discharge port 16 is closed.

As shown in FIG. 8, the pressure regulating valve 6 is provided inside the hollow valve box 17a having the inlet side flow path 24 and the outlet side flow path 38 at the bottom and the side, respectively. Channel 2
An annular valve seat 25 is attached so as to communicate with the valve seat 4, and a valve body 27, a valve rod 28, upper and lower spring receivers 29 and 30, and a spring are disposed on a vertical line 26 passing through the center of the valve seat 25. Coil spring 32 mounted in a compressed state between receivers 29 and 30
And an adjusting screw 33 for adjusting the amount of compression of the coil spring 32, and a disk 40 having damper orifices 39, 39 mounted on the valve rod 28 to balance the fluid pressure on the inlet side. The coil spring 32 whose compression amount is adjusted so that the lower spring support 30 and the valve stem 2
The valve body 27 is pressed against the valve seat 25 through the opening 8 .

Reference numeral 31 in the figure denotes a cage having a number of round holes formed at the upper end and lower end of the thick cylinder at equal intervals in the circumferential direction, and a middle portion in the height direction of the thick cylinder. Is the valve 27
And catches the jet escaping from the gap between the valve seat 25 and the valve box 1
The inner wall 7a is protected from erosion.

As shown in FIG. 9, the safety valve 7 has an annular valve seat 25 attached inside an elbow-shaped valve box 17a so as to communicate with a flow path 24 on the inlet side. The valve body 27, the valve rod 28, the coil spring 32 mounted in a compressed state between the upper and lower spring receivers 29, 30 and the adjusting screw 33 for setting the blowing pressure are arranged on a vertical line 26 passing through. are doing.

As shown in FIG. 10 , the multistage orifice 10 has two types of orifices in which one or two small holes 35a or 35b, 35b are formed in the bottom of a ring-shaped main body 34 having a U-shaped cross section. The members 36a and 36b are alternately set to 10
A cylindrical case 37 in which the orifice members 36c and 36d having substantially the same structure are arranged at both ends thereof is further stacked.
It is made by mounting inside.

[0010]

However, the high-pressure descaling device has the following problems. (1) Since the multistage orifice 10 is attached to the end of the bypass pipe 4, the discharge pressure of the high-pressure pump 8 at the time of unloading, that is, at the time of no injection, becomes the discharge pressure at the time of injection (170).
kg / cm ² ), and the power loss when the high-pressure pump 8 is operated is large.

(2) Generally, the pressure regulating valve and the safety valve are
When there is no liquid blowing, the valve body and valve seat are in metal contact with high surface pressure (generally about 4 kg / mm ² ) by the repulsive force of the coil spring. The body 27 is suddenly seated from the lift state and changes into the valve seat 25. Therefore, the valve body 27 and the valve seat 25
Contact surface is hit, and the contact surface is likely to be roughened and worn. In such a state, the pressure regulating valve 6 loses its function as a safety valve, and cannot be used also as a safety valve.

(3) Therefore, in addition to the unload valve 5, the pressure regulating valve 6, the safety valve 7, the conforming operation valve 9, the multistage orifice 10, etc.
It is necessary to equip various kinds of valves and plumbing fittings. (4) Since the above-mentioned valves and the like are all high-pressure parts, the equipment cost is expensive, and a great deal of labor is required to maintain them in a good state. (5) Further, since piping is attached to each valve, the installation space increases.

In view of the above problems, it is an object of the present invention to provide a multi-function pressure regulating valve having a function of a plurality of types of valves such as an unloading valve, a pressure regulating valve, and a safety valve.

[0014]

According to the present invention, there is provided a multi-function pressure regulating valve which comprises a pressure regulating valve for maintaining a constant fluid pressure at an inlet side, which is provided with the following device: An elevating device that lifts the lower spring receiver upward against the force, a damper device that suppresses rapid movement of the valve stem, and a space in the valve box that is located at the center of the valve body, And a cylindrical basket-like material that is divided into an outer part surrounding the part, and an inlet for injecting compressed air into the valve box is further preferably provided in the valve box. .

More specifically, each of the components will be described in detail. The elevating device includes a cylindrical sleeve having a built-in coil spring and upper and lower spring receivers and a lower end projecting below the lower spring receiver, and an outer periphery of the sleeve. And a cylinder that accommodates the piston and reciprocates the piston in a vertical direction.The sleeve has a hole provided in the center of the upper and lower lids of the cylinder. It penetrates and is supported on the inner wall of the hole to be able to move up and down.

When the lower spring receiver is forcibly lifted upward by using the lifting device, the top of the valve stem and the lower spring receiver are separated from each other. Escapes to the outlet side of the valve. Therefore, when this multifunctional pressure regulating valve is provided in the branch pipe of the discharge pipe, it can be used as an unload valve.

When the pressurized fluid escapes, the cage acts as an orifice to reduce the speed of the escaped fluid to prevent cavitation. Therefore, when this multifunctional pressure regulating valve is used, the multistage orifice can be omitted. By omitting the multistage orifice, the discharge pressure of the high-pressure pump when unloaded (when no injection is performed) is significantly reduced as compared with the discharge pressure during injection. For this reason, the driving power of the high-pressure pump is only 50 to 70% of the conventional one,
Useful for energy saving.

When the amount of compression of the coil spring is adjusted by using the adjusting screw, the discharge pressure of the high-pressure pump is reduced to 0 to 100.
% Can be adjusted steplessly. Therefore, this multifunctional pressure regulating valve can be used as a pressure regulating valve and a valve for running-in operation.

The damper device comprises a piston concentrically mounted on the outer periphery of a valve stem, a hollow block for slidably housing the piston and forming upper and lower damper chambers on the upper and lower sides of the piston, And an orifice communicating with the damper chamber. When the upper and lower damper chambers are filled with oil, rapid movement of the piston, that is, rapid movement of the valve stem, is suppressed by viscous resistance when the oil passes through the orifice. Accordingly, the movement of the valve stem when the sleeve is lowered to perform on-loading becomes slow, and there is no possibility that the valve body hits the valve seat (chattering occurs).

When the multi-function pressure regulating valve is used as a pressure regulating valve during on-loading, the valve body and the valve seat do not metal-touch because the liquid is always blown out. As described above, since the multifunctional pressure regulating valve does not cause cavitation and chattering in various modes of use, that is, during unloading, on-loading, and during switching operation, the sealing surfaces of the valve body and the valve seat are not changed. No damage such as surface roughness and wear on the (contact surface). Therefore, this multi-function pressure regulating valve can also be used as a safety valve.

Further, when compressed air is injected into the valve box, the valve box functions as an air reservoir. Therefore, the flow velocity in the bypass pipe at the time of unloading does not fluctuate rapidly, and the occurrence of the water hammer phenomenon and the liquid column separation (gas-liquid separation) phenomenon can be prevented.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show an example of an embodiment of the present invention. A main part of a multifunctional pressure adjusting valve 41 according to this example includes a pressure adjusting valve for maintaining a constant pressure of a fluid on an inlet side, An elevating device 44 that lifts the lower spring receiver 43 upward against the repulsive force of the coil spring 42 of the pressure adjusting valve, a damper device 46 that suppresses rapid movement of the valve stem 45 of the pressure adjusting valve, and pressure adjustment. A space inside the valve box 47 of the valve is provided with a central portion 49 around the valve element 48,
An outer portion 50 concentrically surrounding the central portion 49
The multifunctional pressure regulating valve 41 is mounted on a branch pipe 54 provided in a discharge pipe 53 of a high-pressure descaling device, as shown in FIG. ing.

This multi-function pressure regulating valve is, as described later,
Since it has functions of a plurality of types of valves such as an unload valve, a pressure regulating valve, and a safety valve, the piping system is greatly simplified as compared with FIG. In FIG. 3, 55 is a steel material for rolling, 56 is a nozzle header for injecting high-pressure water from a nozzle, 57 is a high-pressure pump, 58 is a temperature sensor, 59 is a control circuit, 60 is an electromagnetic air switching valve, and 62 is air. These are reservoirs, and they are the same as the conventional ones, except for special mention in the embodiment of the invention.

The pressure regulating valve is a hollow valve box 4 provided with a flow path 63 on the inlet side and a flow path 64 on the outlet side at the bottom and the side, respectively.
7, an annular valve seat 65 is attached so as to communicate with the flow path 63 on the inlet side, and the valve element 48, the valve rod 45, and the upper and lower members are disposed on a vertical line 66 passing through the center of the valve seat 65. Spring supports 67, 43, a coil spring 42 mounted in a compressed state between the spring supports 67, 43, and a coil spring 42
The adjusting spring 68 for adjusting the amount of compression is disposed. The coil spring 42 whose amount of compression is adjusted so as to balance the fluid pressure on the inlet side is formed by the lower spring receiver 43 and the valve stem 4.
The valve body 48 is pressed against the valve seat 65 through the valve 5.

In order to enable a wide range of compression operation of the coil spring 42, a feed screw mechanism comprising a detent 61 and a female screw 71 screwed to the adjusting screw 68 is provided on the top of the upper spring receiver 67. An adjustment screw 68 is provided
Is converted into a vertical movement of the upper spring receiver 67. Further, the ceiling of the valve box 47 is set sufficiently high in order to provide the valve body 48 with a lift having a sufficient size to secure the blowout amount as a safety valve.

The elevating device 44 incorporates the coil spring 42 and the upper and lower spring receivers 67 and 43, and the lower end 69 protrudes below the lower spring receiver 43.
0, a piston 72 concentrically attached to the outer periphery of the sleeve 70, and a piston 72
The sleeve 70 penetrates through holes 76, 77 provided in the center of lids 74, 75 at the upper and lower portions of the cylinder 73, and the holes 76, 77 are formed. It is supported on the inner wall of the robot so that it can move up and down. At the upper end of the sleeve 70, a limit switch 81 for displaying a use state of the valve is attached.

The damper 46 has a piston 78 concentrically mounted on the outer periphery of the valve stem 45 and slidably accommodates the piston 78 to form upper and lower damper chambers 79 and 80 above and below the piston 78. Orifices 83, 83 penetrating the hollow block 82 and the upper and lower damper chambers 79, 80 through the piston 78, and a bypass penetrating the upper and lower damper chambers 79, 80 through the side wall of the block 82. the needle valve 85 provided in the flow path 84 and the bypass passage 84 (more see Figure 4) is constituted by such as the hollow block 82 and the cylinder 73 in a state of forming a ceiling of the valve body 47 The cylinder 73 is fixed to the valve box 47 interposed between the valve boxes 47.

In this example, the orifice 83 and the needle valve 85 are provided so as to exhibit a throttle effect in a two-stage configuration. However, if a sufficient damping effect can be obtained, one of them may be omitted. 86, 86, 8 in the figure
Reference numeral 7 denotes a plug used for injecting oil and cleaning the damper chamber.

As shown in FIGS. 1 and 5, the cage 52 has a large number (12 in the figure) of round holes 89 formed at the upper and lower ends of a thick cylinder 88 of stainless steel pipe at equal intervals in the circumferential direction. The round hole 89 plays a role of reducing the speed of the fluid passing through the inside of the valve box and preventing the occurrence of cavitation. The middle portion in the height direction of the thick cylinder 88 receives the jet escaping from the gap between the valve body 48 and the valve seat 65 , and serves to protect the inner wall of the valve box 47 so that erosion does not occur on the inner wall. Play.

Further, on the side wall of the valve box 47, there is provided an inlet 90 for injecting compressed air.
, A small amount of compressed air supplied to the cylinder 73 of the elevating device is always supplied via the pipe 92.

When the compressed air is injected into the valve box 47, the valve box acts as an air reservoir, so that a sudden change in the flow velocity in the bypass pipe 93 during the unloading operation is reduced. Therefore, the vibration of the piping can be prevented without causing the water hammer phenomenon and the liquid column separation (gas-liquid separation) phenomenon.

Next, the operation and handling of the multifunctional pressure regulating valve will be described. During rolling of the steel material 55, that is, during on-loading, as shown by arrows in FIGS. 3 and 1, compressed air supplied through the electromagnetic air switching valve 60 is injected into the cylinder 73 of the lifting / lowering device to cause the piston 72 to move. Move to the lower limit position.

In this state, the lower end 69 of the sleeve is below the lower spring receiver 43, and the adjusted elastic force of the coil spring 42 is transmitted to the valve element 48 via the lower spring receiver 43 and the valve rod 45. The valve element 48 is seated on the valve seat 65 or separated from the valve seat 65 to keep the pressure in the discharge pipe constant in accordance with the fluid pressure in the discharge pipe.

Here, when the rolling operation is interrupted, the electromagnetic air switching valve 60 is operated, and compressed air is injected into the cylinder 73 of the lifting device as shown by the arrow in FIG.
Is moved to the upper limit position. By this operation, the sleeve 7
0 forcibly lifts the lower spring receiver 43 upward in a state where the lower end 69 is locked to the lower surface of the lower spring receiver 43.

In this state, the lower spring receiver 43 is connected to the valve rod 45.
, The pressure fluid in the discharge pipe pushes up the valve body 48 and escapes to the bypass pipe 93 to be in an unloaded state. At this time, the cage 52 acts as an orifice to reduce the speed of the escaped fluid.

Accordingly, it is possible to prevent the occurrence of cavitation, thereby preventing erosion of the valve body and the valve seat. Since the water flow resistance of the cage 52 is much smaller than that of the conventional multistage orifice, the discharge pressure of the high-pressure pump during unloading is significantly reduced as compared with the conventional one, and the operating power of the pump is reduced. 50-70% of that is enough.

When the pressure in the discharge pipe 53 reaches a predetermined value (safety valve set pressure) exceeding the working pressure during on-loading, the pressure fluid in the discharge pipe pushes up the valve element 48 and the bypass pipe 93 Escape to Also in this case, the cage 52 operates in the same manner as described above to prevent cavitation.

Further, compressed air is always inside the valve box.
Since a small amount is supplied and the valve box 47 acts as an air reservoir, a sudden change in the flow velocity in the bypass pipe 93 when unloaded is reduced. Therefore, the water hammer phenomenon and the liquid column separation phenomenon do not occur, and there is no possibility that the bypass pipe 93 will vibrate.

Next, when the rolling operation is restarted, the electromagnetic air switching valve is operated to supply compressed air to the cylinder 73 of the elevating device as shown by the arrow in FIG. 1 to move the piston 72 to the lower limit position. . By this operation, the lower end 69 of the sleeve is lowered below the lower spring receiver 43, and the coil spring 42 causes the valve body 48 to be seated on the valve seat 65 via the lower spring receiver 43 and the valve rod 45. At this time, since the lowering operation of the valve rod 45 is suppressed by the damper device 46, the operation when the valve element 48 is seated becomes slow, and there is no possibility that the valve element hits the valve seat (chattering occurs).

The present invention is not limited only to the above-described embodiment. For example, instead of applying this multifunctional pressure regulating valve to a high-pressure pipe other than a high-pressure descaling apparatus, and instead of applying it to a high-pressure pipe, a It goes without saying that various changes can be made without departing from the spirit of the present invention, such as application to low-pressure piping.

[0041]

As described above, the present invention has the following excellent effects. (1) Since one unit has the functions of an unloading valve, a pressure regulating valve, and a safety valve, the following valves and pipes, which are conventionally indispensable, can be omitted. (A) Pressure regulating valve and its piping (b) Safety valve and its piping (c) Familiar operation valve and its piping (d) Multi-stage orifice Therefore, it is possible to simplify the piping system, and equipment and maintenance costs Saving and piping space can be reduced.

(2) Since the discharge pressure of the pump at the time of unloading (when no injection is performed) decreases, the operating power of the pump is reduced to 50 to 70% of that of the conventional pump, which contributes to energy saving. (3) Since the damper device is provided, the valve body does not chatter when switching from unloading to on-loading. (4) Since the cage is provided, no cavitation occurs in the valve box when switching from on-load to unload. Therefore, the life of the valve can be extended in combination with the bill of item (3).

(5) By injecting compressed air into the valve box, it is possible to suppress the occurrence of the water hammer phenomenon and the liquid column separation phenomenon in the bypass pipe, and to prevent the vibration of the pipe. .

(6) Since the discharge pressure acts on the high-pressure pump only during injection and becomes the suction pressure during no injection, the life of the valve, plunger, and plunger packing of the high-pressure pump is extended. (7) Since the air cylinder is moved up and down instantaneously via the electromagnetic air switching valve so as to be on-loaded or unloaded, the response is excellent.

(8) An arbitrary (0 to 100%) discharge pressure (injection pressure) can be obtained by changing the compression strength of the spring with the adjusting screw. (9) Since the valve body and the valve seat do not come into contact with each other during operation, surface roughness and wear hardly occur, and the life is extended.

[Brief description of the drawings]

FIG. 1 is a cut elevation view showing an example of an embodiment of the present invention.

FIG. 2 is an operation explanatory view of the multifunction pressure regulating valve shown in FIG. 1;

FIG. 3 is a piping diagram of a high-pressure descaling device equipped with the multifunctional pressure regulating valve shown in FIG.

FIG. 4 is an enlarged view of the needle valve shown in FIG.

FIG. 5 is an enlarged sectional plan view of the cage from the VV direction in FIG. 1;

FIG. 6 is a piping diagram of a conventional high-pressure descaling device.

FIG. 7 is a cut-away elevation view of a conventional unload valve.

FIG. 8 is a cut-away elevation view of a conventional pressure regulating valve.

FIG. 9 is a cutaway elevation view of a conventional safety valve.

FIG. 10 is a cut-away plan view of a conventional multistage orifice.

[Explanation of symbols]

 42 Coil spring 43 Lower spring receiver 44 Lifting device 45 Valve rod 46 Damper device 47 Valve box 48 Valve element 49 Center part 50 Outer part 52 Cage 63 Inlet-side flow path 65 Valve seat 66 Vertical line 67 Upper spring Receiver 68 Adjusting screw

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-103348 (JP, A) JP-A-61-139810 (JP, A) JP-A-55-166715 (JP, A) 106040 (JP, U) Hira 5-83384 (JP, U) Hira 5-77666 (JP, U) Hira 3-112193 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) G05D 16/00-16/20

Claims (3)

(57) [Claims] An annular valve seat is mounted inside a valve box so as to communicate with a flow path on an inlet side, and a valve body, a valve stem, and a spring at an upper and lower portion are arranged on a vertical line passing through the center of the valve seat. A coil spring mounted in a compressed state between the receivers and an adjusting screw for adjusting the compression amount of the coil spring are arranged, and the lower spring receiver and the valve stem are adjusted so that the coil spring balances the fluid pressure on the inlet side. A multi-function pressure adjusting valve that presses a valve body downward through an elevating device that lifts a lower spring receiver upward against a repulsive force of the coil spring, and suppresses rapid movement of the valve stem. includes a damper device for a space in the valve body, and an inner portion around the valve body, and a cylindrical cage-like product is divided into an outer portion surrounding the portion of the center side, the An elevating device for moving the coil spring and the upper and lower spring supports;
And the lower end protrudes below the lower spring receiver.
Cylindrical sleeve and the outer periphery of the sleeve concentrically
The attached piston and the piston reciprocate up and down
A driving cylinder.
Through the hole provided in the center of the upper and lower lid
A multi-function pressure regulating valve, which is supported so as to be movable up and down . 2. A multifunctional pressure regulation valve according to claim 1, an inlet for injecting a compressed air into the valve box is provided. 3. A piston the damper device is mounted coaxially on the outer periphery of the valve stem, a hollow block forming the damper chamber of the upper and lower portions at the upper and lower sides of the piston and slidably accommodating the piston 3. The multi-function pressure regulating valve according to claim 1, further comprising an orifice communicating with the upper and lower damper chambers. "