JP5120918B2 - Control valve - Google Patents

Description

  The present invention relates to a control valve for a fire-fighting facility such as a plant disaster prevention facility, and more particularly to a control valve installed in a long pipeline, a large-diameter water curtain facility, a water cannon, or the like.

  A conventional control valve for plant disaster prevention equipment includes a valve body that connects the piping of the primary side passage and the piping of the secondary side passage, a main valve that controls the opening and closing of the communication port of the valve body, and the main valve. A piston chamber that is opposed to each other via a secondary-side flow path, is disposed in the piston chamber, has a larger pressure receiving area than the main valve, and connects the control piston and the main valve. Stem, a pressurizing chamber located below the control piston and moving the main valve in the valve opening direction by being pressurized, and an activation valve for communicating the pressurizing chamber and the piping of the primary side flow path And an attached pressure tube.

  And, in the event of a fire, when opening the start valve and supplying the fire extinguishing water in the piping of the primary side flow path to the pressurizing chamber, the control piston moves upward, that is, in the direction of the main valve by the water pressure in the pressurizing chamber, The stem and the main valve also move upward, and the main valve opens. Since the communication port of the main valve opens, the fire-extinguishing water in the primary channel flows into the secondary channel, and is discharged from, for example, a water cannon as a fire-extinguishing facility via a pipeline.

  In the conventional technology, when the start valve is opened and fire extinguishing water is supplied to the pressurizing chamber, the main valve suddenly leaves the valve seat and reaches full open at once. Then, it is pumped at high speed in the piping of the secondary flow path that is not filled with water. And since this overflow fire-extinguishing water passes through a pipe line and the high-pressure fire-extinguishing water is suddenly dropped in flow rate, a so-called water hammer phenomenon occurs in which a very large impact is applied to the nozzle and piping equipment.

In order to solve this problem, in the conventional technique, the piping of the secondary side channel is communicated with the pressurizing chamber, thereby controlling the opening of the main valve while sensing the pressure of the secondary side channel ( For example, Patent Document 1).
Japanese Patent Laid-Open No. 4-90221

  By the way, in the conventional technology, the pressure sensing tube can sense the pressure in the secondary side flow path, but the structure of the control valve main body is complicated and the manufacturing cost is expensive.

  In view of the above circumstances, an object of the present invention is to obtain a control valve for a fire-fighting facility with low production costs while preventing the occurrence of an excessive water hammer phenomenon.

The present invention has been made to solve the above-described problems, and when a pressurized fluid arranged so as to be able to come into contact with and separate from a valve seat that partitions the primary side flow path and the secondary side flow path is supplied. A control valve having a main valve to be opened and adjusting the flow rate of the fluid flowing from the primary side flow path to the secondary side flow path by changing the opening degree of the main valve. A motor valve for starting the main valve by supplying water for extinguishing the primary side flow path as a pressurized fluid, and an orifice as a throttle port in the secondary side flow path are provided, and the pressure upstream of the orifice is A pressure-regulating pilot valve for controlling the opening of the main valve by adjusting the supply of the pressurized fluid from the initial opening to the full opening of the main valve so that the pressure is larger than the downstream pressure by a predetermined value; , especially that downstream of the orifice does not fully open the main valve until the filling of water complete To.

  According to this invention, the throttle port installed in the secondary side flow path generates a pressure difference in the secondary side flow path, that is, a differential pressure between the upstream side and the downstream side of the throttle port, and this differential pressure is controlled by the control means. To adjust the opening of the main valve of the control valve so as not to reach an overflow state. As a result, the main valve of the control valve does not fully open until filling of the downstream side of the throttle port is completed, so that the high-pressure fire-fighting water in the primary side passage pipe is pumped at high speed through the secondary side passage pipe. Never happen. Then, at the stage where the downstream side of the throttle port is fully filled and water discharge is started, the pressure difference at the throttle port is kept small by the control means, so the main valve of the control valve opens smoothly and the fire extinguishing equipment Water hammer due to overflow does not occur in nozzles and piping.

  1 is a block diagram showing a control valve according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view showing a closed state of the control valve, FIG. 3 is a cross-sectional view showing a valve open state of the control valve, and FIG. It is sectional drawing explaining the structure of the pressure regulation pilot valve which concerns on Embodiment 1 of this invention, (b) of FIG. 4 has shown sectional drawing in the plane orthogonal to (a) of FIG.

  In FIG. 1, the control valve 100 is interposed between a primary side flow path pipe 8 and a secondary side flow path pipe 9, and changes the opening of the main valve 27 to change the primary side flow path piping. A valve body 20 for adjusting the flow rate of the fire-extinguishing water flowing from the pipe 8 to the secondary-side flow path 9, the motor valve 11 for starting the valve main body 20 by supplying the valve body 20 with the primary-side flow path fire-extinguishing water, The opening of the main valve 27 is set and opened so that the differential pressure between the orifice S as the throttle port provided in the pipe 9 of the secondary side flow path and the upstream side K1 and the downstream side K2 of the orifice S is constant. And a pressure regulating pilot valve 40 as a control means for controlling each time.

  The hole diameter of the orifice S is obtained by calculation according to the required flow rate of any fire extinguishing equipment. For example, the hole diameter is set so that the differential pressure ΔP at the orifice is 0.05 MPa with respect to a flow rate of 3000 L / min. To do.

  Next, the structure of the valve body 20 will be described with reference to FIGS. In addition, the arrow in FIG. 2 and FIG. 3 has shown the flow of the water for fire extinguishing.

  The valve body 20 includes a primary side flow path 22 to which the primary side flow path pipe 8 is connected, a secondary side flow path 23 to which the secondary side flow path pipe 9 is connected, and the primary side flow path 22 and the secondary side flow path 22. A communication hole 24 that communicates with the secondary flow path 23, and a cylinder that is formed opposite to the communication hole 24 with the axis aligned with the hole center of the communication hole 24 and with the secondary flow path 23 interposed therebetween. Chamber 25.

  The main valve 27 includes a disk portion 28, a plurality of guide portions 29 extending in the axial direction of the main valve 27 at an equiangular pitch in the circumferential direction from the vicinity of an edge on one side of the disk portion 28, and the disk portion 28, an O-ring 30 disposed on one outer peripheral edge portion. The main valve 27 is slidably mounted by inserting the guide portion 29 into the communication hole 24 from the primary channel 22 side.

  One end of the valve rod 31 is fixed to the center of the other side of the disk portion 28 of the valve body 27, and the other side is slidably inserted into a receiving member 33 mounted on the lid body 32. The receiving member 33 is inserted into the lid 32 so as to prevent fluid leakage, and the valve stem 31 is inserted through the receiving member 33 so as to prevent fluid leakage. A spring 34 is contracted between the lid 32 and the disk portion 28 of the main valve 27 to press the disk portion 28 toward the secondary channel 23. As a result, the O-ring 30 is in close contact with the valve seat 26.

  The piston 35 is slidably mounted in the cylinder chamber 25 so as to define the inside of the cylinder chamber 25 into a piston chamber 25a on the secondary flow path side and a working chamber 25b on the anti-secondary flow path side. Then, one end of the connecting rod 36 is fixed to the center position of the piston 35, and a receiving member 37 attached to a partition wall between the secondary side flow path 23 and the cylinder chamber 25 is slidably inserted. The end is fixed to a central portion on one side of the disk portion 28 of the valve body 27. A communication hole 38 is formed in the partition wall of the cylinder chamber 25 so as to communicate the piston chamber 25a with the outside, and an inflow / outlet port 39 communicates the working chamber 25b with the outside. The receiving member 37 is inserted through the partition wall so as to prevent fluid leakage, and the connecting rod 36 is inserted through the receiving member 37 so as to prevent fluid leakage.

  In the valve body 20 configured in this way, the main valve 27 is moved downward in FIG. 2 by the urging force of the spring 34 unless pressurized fluid (fire-extinguishing water) is supplied from the inlet / outlet 39 to the working chamber 25b. ing. Then, the O-ring 30 of the main valve 27 is pressed against the valve seat 26 of the communication hole 24, and the flow path between the primary side flow path 22 and the secondary side flow path 23 is blocked.

  When the pressurized fluid is supplied from the inlet / outlet 39 to the working chamber 25 b, the piston 35 is moved upward in FIG. 2 against the urging force of the spring 34. Then, the O-ring 30 of the main valve 27 is separated from the valve seat 26 of the communication hole 24, and the flow path between the primary flow path 22 and the secondary flow path 23 is opened as shown in FIG. The

  Next, the structure of the pressure regulating pilot valve 40 will be described with reference to FIG.

  The main body 41 is divided into a first divided body 42 and a second divided body 43. Then, the flam 45 held by the flam presser 44 is sandwiched between the first divided body 42 and the second divided body 43, so that the first operation chamber 46 and the second operation chamber 47 are defined. Is attached.

  The first operation chamber 46 is defined in the first divided body 42 by the flam 45. A downstream connection port 48 connected to the downstream side K2 of the orifice S via the pipe 18 is formed in the first divided body 42. And the through-hole 49 is formed in the 1st division body 42 so that the 1st operation chamber 46 and the downstream connection port 48 may be connected.

  The second operation chamber 47 is defined in the second divided body 43 by the flam 45. Further, the second divided body 43 has a connection port in four directions, that is, a primary side connection port 50 connected to the pipe 8 of the primary flow path via the pipe 15, and an upstream side of the orifice S via the pipe 16. An upstream connection port 51 connected to K1, a cylinder connection port 52 connected to the inlet / outlet port 39 of the valve body 20 via the pipe 17, and a closed connection port 53 sealed by a plug 54. ing. And the through-hole 55 is formed in the 2nd division body 43 so that the 2nd operation chamber 47 and the upstream connection port 51 may be connected. A through hole 56 is formed in the second divided body 43 so as to communicate the cylinder connection port 52 and the closed connection port 53.

  A valve chamber 57 is formed inside the second divided body 43. The valve chamber 57 communicates with the primary side connection port 50 through the through hole 58, and communicates with the through hole 56 that communicates the cylinder connection port 52 and the closed connection port 53 through the through hole 59. . The valve chamber 57 is provided with a valve body 62 that is seated on the valve seat 61 at the opening edge of the through hole 59 by the biasing force of the spring 60.

  The case 63 has a bottomed cylindrical shape, and is fastened and fixed to the first divided body 42 with the opening facing the first divided body 42. The piston 64 is slidably disposed in a recess 65 that is recessed on the case 63 side of the first divided body 42. A spring receiver 66 is disposed in the case 63 so as to face the piston 64, and a spring 67 is provided between the piston 64 and the spring receiver 66. The adjustment screw 68 is screwed onto the head of the case 63, and the tip of the adjustment screw 68 presses the spring receiver 66 to adjust the spring pressure. The adjustment screw 68 is fixed by a nut 69.

  The first shaft 70 is disposed so that one end thereof is fixed to the flam presser 44, the first divided body 42 is inserted, and the tip thereof is in contact with the piston 64. Further, the second shaft 71 is disposed so that one end is fixed to the valve body 62, passes through the through hole 59, passes through the second divided body 43, and a tip of the second shaft 71 contacts the frame presser 44. Note that an O-ring is interposed in the insertion portion of the first divided body 42 of the first shaft 70 to prevent fluid leakage, and the first shaft 70 is slidable. In addition, a minute gap is formed in the insertion portion of the second divided body 43 of the second shaft 71 so that the second shaft 71 can move in the axial direction.

  In the pressure regulating pilot valve 40 configured as described above, the spring pressure adjusted by the adjusting screw 68 acts to press the fram 45 downward in FIG. 4 via the piston 64 and the first shaft 70. The adjusting screw 68 can set a differential pressure α between the pressure P2 and the pressure P3. Further, the pressure in the first operation chamber 46 acts to press the flam 45 downward in FIG. On the other hand, the pressure in the second operation chamber 47 acts to press the flam upward in FIG.

  The first operation chamber 46 is supplied with water for extinguishing water K2 downstream of the orifice S having the pressure P3 through the pipe 18, and the second operation chamber 47 is supplied with the orifice S having the pressure P2 through the pipe 16. Water for fire extinguishing on the upstream side K1 is supplied.

  Therefore, P2−P3 = α is designed. For example, α = 0.05 MPa.

  Next, the operation of the control valve 100 configured as described above will be described.

  First, when the motor valve 11 is actuated, the water for fire extinguishing in the pipe 8 of the primary side flow channel flows into the valve chamber 57 from the primary side connection port 50 of the pressure regulating pilot valve 40 through the pipe 15. At this time, since the valve main body 20 is closed, the fire-extinguishing water does not flow into the pipe 9 of the secondary side flow path. Eventually, the pressure in the valve chamber 57 increases, the valve body 62 is pushed down, and the primary side connection port 50 and the cylinder connection port 52 communicate with each other. As a result, the fire extinguishing water flows into the working chamber 25b from the inlet / outlet port 39 of the valve body 20 via the pipe 17. When the fire-extinguishing water is filled in the working chamber 25 b, the piston 35 is raised, the main valve 27 is separated from the valve seat 26, and the flow path between the primary flow path 22 and the secondary flow path 23. Is released. Therefore, the fire-extinguishing water flows from the primary-side flow path pipe 8 through the valve body 20 into the secondary-side flow path pipe 9, and the fire-extinguishing water pressure in the secondary-side flow path pipe 9 rises. In this case, due to the restriction effect of the orifice S, the pressure P2 on the upstream side K1 of the orifice S reaches a predetermined value (here 0.05 MPa), the pressure in the second operation chamber 47 becomes constant via the pipe 16, and the main valve 27 is an initial opening. At this time, since the differential pressure at the orifice S was set to ΔP = 0.05 MPa, P2−P3 = 0.05 MPa. Until the downstream side K2 of the orifice S is completely filled, the pressure P3 has a value such as a pipe friction loss or a hydrostatic head due to flowing water, but is almost close to 0, so the main valve 27 is fully opened. However, the opening degree is maintained as it is to prevent overflow (FIG. 5).

  Next, when the filling of the downstream side K2 of the orifice S is completed, the pressure P3 rapidly increases. This pressure increase is transmitted to the first operation chamber 46 via the pipe 18, and the pressure in the first operation chamber 46 also increases rapidly. To do. If it does so, the valve body 62 will be pushed down, the fire extinguishing water which flows from the primary side connection port 50 to the cylinder connection port 52 will increase, and the fire extinguishing water which will flow from the piping 8 of the primary side flow path to the piping 9 of the secondary side flow path will also increase. Incidentally, at this time, the pressure adjustment pilot valve 40 maintains and adjusts the pressure P2 to be 0.05 MPa higher than the pressure P3, so that the pressure P2 increases as the pressure P3 increases. As the pressure P2 rises, the pressure in the second operation chamber 47 rises, and the valve body 62 is pushed up, thereby suppressing an increase in the amount of fire-extinguishing water flowing from the primary side connection port 50 to the cylinder connection port 52. The amount of fire fighting water flowing from the pipe 8 of the road to the pipe 9 of the secondary flow path is also suppressed. The above operation is repeated, the pressure P2 is adjusted to a pressure that is larger by α than the pressure P3, and fire-extinguishing water flows smoothly from the primary-side flow path pipe 8 to the secondary-side flow path pipe 9. (FIG. 6).

  Eventually, the pressure P2 on the upstream side K1 reaches a predetermined maximum pressure (here, 1.0 MPa) and does not increase any more. During this time, the main valve 27 opens at a constant speed until it is fully opened, and water hammer due to overflow does not occur in the pipe 9 of the secondary side flow path (FIG. 7).

  As described above, according to the first embodiment, the throttle port S installed in the pipe 9 of the secondary side channel has a pressure difference between the secondary channel and the upstream side K1 and the downstream side of the throttle port S. A differential pressure is generated in K2, and this differential pressure is adjusted by the control means to control the opening of the main valve 27 of the control valve 100 so as not to reach an overflow state. Thereby, the main valve 27 of the control valve 100 is not fully opened until the downstream side K2 of the throttle port S is completely filled, so that the high-pressure fire-extinguishing water in the pipe 8 of the primary side flow path becomes the pipe of the secondary side flow path. The inside of 9 is not pumped at high speed. Then, at the stage where the downstream side K2 of the throttle port S is completely filled and water discharge is started, the pressure difference of the throttle port S is kept small by the control means, so that the main valve 27 of the control valve 100 is smooth. It is fully open, and there is an effect that water hammer due to overflow does not occur in the fire extinguishing equipment nozzle or piping.

  The control means is a pressure regulating pilot valve 40. Specifically, the pressure regulating pilot valve 40 can contact and separate the primary side connection port 50 and the cylinder connection port 52 with respect to the partition valve seat 61. A valve body 62 disposed in the operation chamber, an operation chamber in which the axial direction is a contact / separation direction of the valve body 62 with respect to the valve seat 61, and the operation chamber is disposed so as to be displaceable in the axial direction. A fram 45 serving as a partition member that defines a first operation chamber 46 into which the pressure P3 is introduced in the axial direction and a second operation chamber 47 into which the pressure P2 is introduced. A spring 67 as a biasing means for biasing in the direction, and a power transmission member for transmitting the axial displacement of the flam 45 to the valve body 62 so as to contact and separate the valve body 62 from the valve seat 61. As a first shaft 70 and a second shaft 71 , And a. The pressure regulating pilot valve 40 senses the pressure P3 on the downstream side K2 of the orifice S, and regulates the pressure P2 on the upstream side K1 to be higher than the pressure P3 by a constant differential pressure α. Therefore, even if the pressure P3 fluctuates, the pressure P2 fluctuates following the fluctuation of the pressure P3, and the differential pressure becomes constant. Therefore, the operation until the main valve 27 is fully opened is performed smoothly, and the nozzle of the fire extinguishing equipment Water hammer due to overflow does not occur in pipes and pipes.

  Further, the throttle port may be an inexpensive one such as an orifice, and the control valve body does not require a complicated structure, and the equipment cost of the control valve device can be reduced.

Control valve 100 according to Embodiment 1 Closed state of the valve body 20 according to the first embodiment Valve open state of valve body 20 according to the first embodiment Sectional drawing of the pressure regulation pilot valve 40 concerning Embodiment 1. FIG. Control valve 100 starts to open Control valve 100 is half open Control valve 100 is fully open

Explanation of symbols

8 Piping for primary side passage 9 Piping for secondary side passage 11 Motor valve 15 Piping 16 Piping 17 Piping 18 Piping
20 Valve body 40 Pressure regulating pilot valve K1 Upstream side K2 Downstream side S Orifice 100 Control valve

Claims (1)

It has a main valve that is opened when pressurized fluid arranged so as to be able to come into contact with and separate from the valve seat that divides the primary side flow path and the secondary side flow path is provided. In a control valve that adjusts the flow rate of the fluid flowing from the primary side flow path to the secondary side flow path,
A motor valve for starting the main valve by supplying the main valve with water for extinguishing the primary side flow path as the pressurized fluid;
An orifice as a throttle port is provided in the secondary side flow path,
The supply of the pressurized fluid is adjusted from the initial opening to the full opening of the main valve so that the pressure on the upstream side of the orifice is a pressure larger than the pressure on the downstream side of the orifice by a predetermined value. A control valve comprising a pressure-regulating pilot valve for controlling an opening degree, wherein the main valve is not fully opened until the downstream side of the orifice is completely filled .