JP3905231B2 - Pressure regulating valve - Google Patents

Description

[0001]
[Industrial technical field]
The present invention relates to a pressure control valve that adjusts the water discharge pressure of a fire extinguishing facility such as a tunnel that sprays water for fire extinguishing from a water spray head in a fire to a specified pressure by controlling a main valve provided in a water supply pipe.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, fire extinguishing equipment that extinguishes a fire by discharging fire-extinguishing water from a head is installed in a long-distance tunnel or the like. Such tunnel fire extinguishing equipment has a water discharge section set every 50 m, and a plurality of water spray heads are installed in each section to enable water discharge.
[0003]
A plurality of water spray heads provided for each section are connected to the secondary side of an automatic valve (main valve) similarly provided for each section, and in the event of a fire, for example, two valves including the fire occurrence section are controlled to open. The fire-fighting water supplied under pressure from each water spray head is discharged.
[0004]
The automatic valve provided in each section is provided with a piston cylinder mechanism as an actuator for controlling the opening and closing of the valve body. By opening the pilot motorized valve remotely or opening the manual orbit valve, the primary valve of the water supply pipe is provided. Pressure is supplied to the piston cylinder mechanism to open the automatic valve.
[0005]
However, simply opening the automatic valve to a certain degree of opening will change the pressure of the fire-extinguishing water discharged from the water spray head if the pressure on the primary piping changes, and the fire-extinguishing performance will not be stable. Therefore, a pressure adjusting valve is provided for adjusting the head water discharge pressure to a specified pressure, for example, 3.5 kgf / cm @ 2 when water is discharged from the water spray head due to a fire.
[0006]
This pressure adjustment valve introduces the pressure of the secondary side piping of the automatic valve (hereinafter referred to as “secondary pressure”) and compares it with a predetermined pressure set in advance. When the secondary pressure becomes lower than the specified pressure, Increase the opening to increase the secondary pressure, and when the secondary pressure becomes higher than the specified pressure, lower the opening of the automatic valve to lower the secondary pressure. By adjusting the valve opening, the secondary pressure is reduced. Keep the specified pressure set in advance.
[0007]
As an automatic valve pressure adjustment mechanism using such a pressure adjustment valve, when the pressure is released from the piston cylinder mechanism of the automatic valve, the atmospheric pressure that flows pressurized water from the cylinder chamber flowing through the pressure adjustment valve to a drain pipe open to the atmosphere There are a drainage system and a secondary drainage system that flows to the secondary side of the automatic valve.
[0008]
FIG. 9 shows a fire extinguisher equipped with a conventional pressure adjusting mechanism employing an atmospheric drainage system. In FIG. 9, the main valve 10 includes a piston cylinder mechanism that opens and closes the valve body 24. The piston cylinder mechanism 15 forms a first cylinder chamber 18 inside the piston 16 and forms a second cylinder chamber 20 having a spring 22 on the outside. The second cylinder chamber 20 is always in communication with the secondary side of the main valve 10 through a communication passage formed in the rod of the piston 16.
[0009]
A fire extinguishing pipe (not shown) is connected to the primary side of the main valve 10 and filled with pressurized water. A butterfly valve 11 as a gate valve is provided on the secondary side of the main valve 10, and a plurality of water spray heads provided in the compartment on the secondary side of the butterfly valve 11 are branched and connected by piping.
[0010]
The main valve 10 is opened and closed by a remotely driven electric valve (pilot valve) 30. A manual start valve 32 is connected to the motor operated valve 30 in parallel. Adjustment of the secondary pressure with the main valve 10 opened is performed by the pressure adjustment valve 120. The pressure regulating valve 120 has a cylinder port CL, a secondary pressure pilot port P2 / PL that also serves as a secondary pressure port and a pilot port, and a drain port DP.
[0011]
The main valve 10 is opened in the event of a fire by opening the motor-operated valve 30 by remote control, for example. When the motor-operated valve 30 is opened, the primary pressure of the main valve 10 is introduced via the stop valve 26, supplied from the motor-operated valve 30 through the orifice 28 to the first piston chamber 18 of the piston cylinder mechanism, and at the same time pressure adjustment Primary pressure is also applied to the cylinder port CL of the valve 120.
[0012]
When the primary pressure is introduced into the first piston chamber 18, the piston 16 strokes outward against the spring 20, the valve 24 is opened, pressurized water is supplied to the secondary side, and water is discharged from the water spray head. At this time, the secondary pressure due to the opening of the valve 24 is introduced into the secondary pressure pilot port P2 / PL of the pressure regulating valve 120.
[0013]
The pressure regulating valve 120 compares the secondary pressure introduced from the secondary pressure pilot port P2 / PL with a specified pressure that is an adjustment target set in advance by a spring load. Assuming that the secondary pressure becomes higher than the specified pressure at this time, the pressure regulating valve 120 operates a built-in valve mechanism so that the cylinder port CL communicates with the drain port DP, and the first cylinder chamber 18 moves to the drain port DP. Pressurized water is flowed to reduce the pressure in the first cylinder chamber 18. For this reason, the piston 16 strokes in the direction in which the valve 24 is closed, and the secondary pressure is lowered to a specified pressure.
[0014]
If the secondary pressure is lower than the specified pressure, the pressure regulating valve 120 operates a built-in valve mechanism so as to disconnect the cylinder port CL from the drain port DP, and the first cylinder chamber 18 is maintained at the primary pressure. In this state, the pressure in the second cylinder chamber 20 decreases as the secondary pressure decreases. For this reason, the piston 16 strokes in the direction in which the valve 24 is opened, and the secondary pressure is increased to a specified pressure.
[0015]
Such a pressure regulating valve 120 is configured to spray water by opening and closing the valve 24 by repeatedly introducing the primary pressure into the first cylinder chamber 18 and discharging it to the drain port DP in accordance with the increase or decrease of the secondary pressure with respect to the specified pressure. Keep the water discharge pressure from the head at the specified pressure.
[0016]
When the main valve 10 is closed after extinguishing the fire, the motor-operated valve 30 is closed. When the motor-operated valve is closed, the introduction of the primary pressure to the first cylinder chamber 18 is cut off. For this reason, the pressure regulating valve 120 The pressurized water in the first cylinder chamber 18 flows to the secondary side through the clearance (internal orifice flow path) of the internal valve mechanism between the cylinder port CL and the secondary pressure pilot port P2 / PL, and the first cylinder chamber 18 Approaches the secondary pressure of the second cylinder chamber 20. When the pressure in the first cylinder chamber 18 approaches the pressure in the cylinder chamber 20, the piston 16 is stroked by the force of the spring 22 to close the valve 24.
[0017]
FIG. 10 symbolizes the pressure regulating valve 120 with respect to FIG. The pressure regulating valve 120 indicated by a symbol includes a cylinder port CL, a secondary pressure port P2, and a pilot port PL. The secondary pressure port P2 and the pilot port PL are different from the secondary pressure pilot port P2 / PL in FIG.
[0018]
The pressure regulating valve 120 operates with a balance between the force of the secondary pressure introduced into the pilot port PL and the force of the set load that determines the specified pressure by the spring 160 disposed at the opposed position.
[0019]
During the opening operation of the main valve 10 with the motor-operated valve 30 open and when the secondary pressure is less than the specified pressure determined by the spring load, the pressure regulating valve 120 is located on the left side of the figure, and the cylinder port CL and the drain port DP are connected. Separated.
[0020]
When the secondary pressure of the pilot port PL exceeds a specified pressure determined by the spring load, the pressure regulating valve 120 switches to the right position, the cylinder port CL communicates with the drain port DP, and the pressurized water in the first cylinder chamber 18 is released to the atmosphere. Reduce pressure by draining to drain. Note that the cylinder port CL and the secondary pressure port P2 communicate with each other via an internal orifice passage 180 determined by a gap of the internal valve mechanism at any switching position.
[0021]
FIG. 11 is a schematic structure of the main valve 10 and the pressure regulating valve 120 in the atmospheric drainage system shown in FIGS. 9 and 10 and represents a normal monitoring time when the main valve 10 is closed. In the piston cylinder mechanism 15 of the main valve 10, the second cylinder chamber 20 in which the spring 22 is accommodated communicates with the secondary side through a communication path in the biston rod. A water spray head 25 is branchedly connected to the secondary side of the main valve 10.
[0022]
The pressure regulating valve 120 introduces secondary pressure from the pilot port PL to the pressure chamber of the diaphragm 148, displaces the diaphragm 148 in balance with the spring 160, thereby opening and closing the valve 150, and opening the valve 150. Introduces the pressurized water in the first cylinder chamber 18 from the cylinder port CL and discharges it to the atmosphere.
[0023]
FIG. 12 shows the operation when the main valve 10 is opened when the motor-operated valve 30 is opened and when the secondary pressure rises to a fixed pressure after the opening. When the motor-operated valve 30 is opened, the primary pressure is supplied to the first cylinder chamber 18 of the main valve 10, the piston 16 is stroked outward against the spring 22, the valve 24 is opened, and pressurized water is flowed to the secondary side. Then, water is discharged from the water spray head 25.
[0024]
At this time, the primary pressure is introduced into the cylinder port CL of the pressure regulating valve 120, the secondary pressure is introduced into the pilot port PL, and the secondary pressure is below the specified pressure by the set load of the spring 160. Is closed. Therefore, while the secondary pressure is lower than the specified pressure, the piston 16 continues to stroke the valve 24 to the open side, and the secondary pressure increases.
[0025]
FIG. 13 shows a case where the secondary pressure becomes higher than the specified pressure during the water discharge from the water spray head 25. When the secondary pressure becomes higher than the specified pressure, the pressure regulating valve 120 pushes up the diaphragm 148 against the spring 160, opens the valve 150 and connects the cylinder port CL to the atmosphere, and supplies pressurized water from the first cylinder chamber 18 to the atmosphere. The pressure in the first cylinder chamber 18 is lowered. For this reason, the piston 16 strokes in the direction in which the valve 24 is closed, and the secondary pressure is lowered to a specified pressure.
[0026]
FIG. 14 shows a case where the main valve 10 is closed after the fire is extinguished. When the motor-operated valve 30 is closed, the introduction of the primary pressure to the first cylinder chamber 18 is cut off, and the gap between the cylinder port CL and the secondary pressure port P2 of the pressure regulating valve 120 (internal orifice flow path 180 in FIG. 10). The pressure water in the first cylinder chamber 18 flows to the secondary side and gradually decreases so that the pressure in the first cylinder chamber 18 becomes the same as the secondary pressure in the second cylinder chamber 20. As the pressure in the first cylinder chamber 18 decreases, the piston 16 gradually strokes by the force of the spring 22 to close the valve 24.
[0027]
FIG. 15 shows a conventional secondary drainage system, and FIG. 16 shows the pressure regulating valve of FIG. 15 with a symbol. The secondary communication type pressure regulating valve 220 includes a primary pressure port P1, a cylinder port CL, a secondary pressure pilot port P2 / PL that also serves as a secondary pressure port and a pilot port.
[0028]
Referring to the pressure regulating valve 220 represented by the symbol in FIG. 16, the left and right switching positions depend on the set load of the spring 260 that determines the regulated pressure on the secondary side to be adjusted and the secondary pressure introduced into the pilot port PL. Determined by balance of power. That is, when the secondary pressure is lower than the specified pressure, it is in the left switching position, and when the secondary pressure becomes higher than the specified pressure, it is switched to the right position.
[0029]
At the switching position on the left side when the secondary pressure is lower than the specified pressure, the pressure adjustment valve 220 connects the primary pressure port P1 to the cylinder port CL, and simultaneously connects the primary pressure port P1 to 2 via the internal orifice channel 250. It communicates with the next pressure port P2. On the other hand, at the switching position on the right side where the secondary pressure becomes higher than the specified pressure, the primary pressure port P1 is disconnected and the cylinder port CL is communicated with the secondary pressure port P2 via the internal orifice channel 250.
[0030]
FIG. 17 is a cross-sectional view of the pressure regulating valve 220 used in the secondary drainage system of FIGS. In FIG. 17A, a spool valve 210 urged in the closing direction by a spring 225 is provided inside the valve, and the spool valve 210 is in contact with the diaphragm portion 248 via a plunger 230. The spool valve 210 has a valve seat 240 mounted on the plunger 230 side. A set load that determines the secondary side specified pressure is applied to the diaphragm portion 248 by a spring 260.
[0031]
The primary pressure port P <b> 1 introduces a primary pressure into the valve chamber of the spool valve 210. The secondary pressure pilot port P2 / PL introduces the secondary pressure into the pressurizing chamber of the diaphragm portion 248. The plunger 230 provided between the spool valve 210 and the diaphragm portion 248 is not sealed with an O-ring or the like, and the clearance around the plunger 230 forms the internal orifice channel 250 of FIG.
[0032]
Cylinder port CL Is formed in a direction orthogonal to the plunger 230 as indicated by a broken line in FIG. FIG. 17B is a cross section in a direction orthogonal to FIG. 17A, and the cylinder port CL communicates with the gap around the plunger 230.
[0033]
15 and 16, when the motor-operated valve 30 is opened, the primary pressure of the pressurized water is introduced into the primary pressure port P1 of FIG. 17A and passes through the valve chamber of the spool valve 210 from the periphery of the plunger 230 as shown in FIG. The primary pressure is supplied by flowing pressurized water into the first cylinder chamber 18 of the main valve 10 in communication with the cylinder port CL of FIG. As a result, the main valve 10 opens and pressurized water flows to the secondary side, and the secondary pressure is introduced to the secondary pressure pilot port 2P / PL.
[0034]
When the secondary pressure becomes higher than the specified pressure during water discharge from the water spray head, the diaphragm portion 248 moves upward against the spring 260, the spool valve 210 is also lifted via the plunger 230, and the valve seat 240 is moved to the valve seat. The primary pressure port P1 and the cylinder port CL are closed and separated from each other.
[0035]
This is the switching to the right position of the pressure regulating valve 220 in FIG. At this time, the cylinder port CL separated from the primary pressure port P1 passes from the pressure chamber of the diaphragm portion 248 through the internal orifice passage 250 of FIG. It communicates with 2P / PL.
[0036]
For this reason, the pressurized water in the first cylinder chamber 18 in the main valve 10 of FIG. 16 flows from the secondary pressure pilot port 2P / PL to the secondary side of the main valve 10 through the gap of the plunger 230, The pressure drops. For this reason, the piston 16 strokes in the direction in which the valve 24 is closed, and lowers the raised secondary pressure to a specified pressure.
[0037]
When the motor-operated valve 30 is closed to extinguish the fire and close the main valve 10, the pressurized water in the first cylinder chamber 18 passes from the cylinder port CL of the pressure regulating valve 220 through the gap of the plunger 230 to the secondary pressure pilot port. Therefore, the pressure in the first cylinder chamber 18 gradually decreases and approaches the second cylinder chamber 20, and the valve 24 is slowly closed by the force of the spring 22.
[0038]
[Problems to be solved by the invention]
However, in the pressure adjusting mechanism of the atmospheric discharge system of FIGS. 9 to 14 in which the pressurized water flowing from the cylinder chamber of the main valve to the pressure regulating valve is flowed to the drain pipe open to the atmosphere, the pressure regulating valve draws the pressurized water from the cylinder of the main valve. In order to open to the atmosphere, there is a merit that the main valve quickly follows the control of the pressure regulating valve. However, a drain pipe for treating the drainage from the pressure regulating valve is required, which makes the construction troublesome and increases the cost. Also, there is a case where cold air has frozen the pressure regulating valve through the drain pipe in winter, and it is necessary to prevent freezing.
[0039]
Also, in the secondary side discharge type pressure adjustment mechanism of FIGS. 15 to 17 in which the pressurized water flowing from the main valve cylinder chamber to the pressure adjustment valve flows to the secondary side of the main valve, there is no need to install a water distribution pipe. Although there is no problem of freezing due to water pipes, there is little differential pressure between the main valve cylinder chamber and the secondary side when the pressurized water in the main valve cylinder chamber flows to the main valve secondary side through the internal orifice passage of the pressure regulating valve. The follow-up of the main valve is delayed with respect to the control of the pressure regulating valve, and it takes time to adjust the secondary pressure to the specified pressure.
[0040]
Moreover, when the fire is extinguished and the main valve 10 is closed, it is desired that the valve 24 of the main valve 10 be completely closed within a predetermined time (for example, within 30 seconds) after the motor-operated valve 30 is closed. It is necessary to widen the gap between the internal orifice channels 180 and 250 of the pressure regulating valve 120 so that the valve 24 of the main valve 10 is completely closed within a predetermined time after the motor-operated valve 30 is closed. Since the valve 24 is closed at a constant speed, an impact is applied when the valve 24 is completely closed.
[0041]
The present invention shortens the response time when the pressurized water in the main valve cylinder chamber is flowed to the secondary side to adjust the secondary pressure of the main valve to the specified pressure, thereby improving the follow-up performance, and the impact when the valve is completely closed. An object of the present invention is to provide a pressure regulating valve that suppresses the pressure.
[0042]
[Means for Solving the Problems]
In order to achieve this object, the present invention is configured as follows. First, according to the present invention, a primary pressure and a secondary pressure are switched and introduced into one first cylinder chamber partitioned by a piston with respect to a piston cylinder mechanism for opening and closing a main valve installed in a pipe for supplying pressurized water. In addition, the secondary pressure is always introduced into the other second cylinder chamber, and the valve body is opened and closed by the movement of the piston corresponding to the switching between the primary pressure and the secondary pressure with respect to the first cylinder chamber, so that the secondary pressure is regulated. The target is a pressure control valve that adjusts to
[0043]
As such a pressure regulating valve, the present invention provides a primary pressure port for connecting the primary side of the main valve to introduce the primary pressure, a cylinder port for connecting the first cylinder chamber of the main valve, A secondary pressure port for connecting the secondary side to introduce the secondary pressure, a pilot port for connecting the secondary side of the main valve to introduce the secondary pressure as a pilot pressure, and a main valve secondary to be adjusted A pressure setting spring that sets the specified pressure on the side, a diaphragm that is displaced to a position where the force of the pressure setting spring and the force of the secondary pressure introduced from the pilot port are balanced, A first valve portion that opens and closes between the primary pressure port and the cylinder port, and a second valve portion that controls the amount of communication between the cylinder port and the secondary pressure port, When the secondary pressure is lower than the specified pressure in conjunction with the diaphragm displacement, The first valve part Primary pressure port communicates with cylinder port to supply primary pressure to first cylinder chamber And the second valve portion controls the direction of disconnecting the communication between the cylinder port and the secondary pressure port, If the secondary pressure is higher than the specified pressure, The first valve part When the cylinder port is disconnected from the primary pressure port In both cases, the second valve portion is controlled to increase the communication amount between the cylinder port and the secondary pressure port. And a pilot valve mechanism.
[0044]
According to such a pressure regulating valve of the present invention, when the secondary pressure becomes higher than the specified pressure during the water discharge from the water spray head by opening the main valve, the pilot valve mechanism disconnects the cylinder port from the primary pressure port. The cylinder port is connected to the secondary pressure port with low loss, and the pressurized water of the cylinder port is allowed to flow to the secondary side of the main valve.
[0045]
At this time, the connection between the cylinder port and the secondary pressure port is not a large-loss internal orifice passage formed by a gap between the plunger members as in the prior art, but the communication between the low-loss ports by the opening operation of the pilot valve mechanism. The secondary pressure is adjusted so that the pressurized water in the first cylinder chamber of the main valve immediately flows to the secondary side of the main valve to lower the pressure, and the main valve operates in the direction of closing the valve in a short time to reach the specified pressure. And the followability of the main valve for adjusting the pressure with respect to the secondary pressure fluctuation can be improved.
[0046]
In addition, since the pressure is adjusted by flowing pressurized water from the main valve cylinder chamber through the pressure regulating valve to the secondary side of the main valve, such as a pressure regulating valve that flows pressurized water from the main valve cylinder to a drain pipe open to the atmosphere. A drain pipe is not required, construction is simple and cost is reduced. Moreover, it is possible to prevent the pressure regulating valve from freezing via the drain pipe due to cold air in winter.
[0047]
Here, the pilot valve mechanism consists of a diaphragm pressure chamber, a cylinder port Communication part A spool hole formed through the primary pressure introduction chamber and the secondary pressure introduction chamber in order, a spool valve body slidably accommodated in the spool hole, a cylinder port communication portion, and a primary pressure introduction chamber A primary valve introduction chamber and a secondary pressure when the first valve portion opens between the cylinder port communication portion and the primary pressure introduction chamber. A second valve portion that closes between the introduction chambers and opens between the primary pressure introduction chamber and the secondary pressure introduction chamber when the first valve portion closes between the cylinder port communication portion and the primary pressure introduction chamber. With. The first valve portion of the pilot valve mechanism includes a valve seat formed in the spool hole opening of the primary pressure introduction chamber and a valve body formed in a flange shape at the position of the primary pressure introduction chamber on the outer periphery of the spool valve. To do. The second valve section includes an internal flow path that opens from the cylinder port communication section through the inside of the spool to the spool front end of the secondary pressure introduction chamber, a valve body formed by the spool front end that opens the internal flow path, It is comprised with the valve seat which is the contact surface of the plug member with which the valve body of a front-end | tip contacts.
[0048]
Furthermore, the pressure regulating valve according to the present invention forms a narrowed bypass path between the cylinder port and the secondary pressure port in a state where the cylinder port and the secondary pressure port are separated from each other by the pilot valve mechanism. A closed delay valve is provided for flowing pressurized water from one cylinder chamber to the secondary side of the main valve. This closed delay valve is provided with a needle valve that can be adjusted by a throttle in a bypass path formed between the cylinder port and the secondary pressure port.
[0049]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an explanatory view of a pressure adjusting mechanism using a pressure adjusting valve of the present invention.
[0050]
In FIG. 1, the main valve 10 is supplied with pressurized water through a water supply pipe (not shown) on the primary side and is provided on the secondary side. Butterfly valve 11, for example, a plurality of water spray heads installed for each 50-meter section of the tunnel are branched and connected.
[0051]
The main valve 10 is provided with a cylinder piston mechanism 15 as an actuator. The cylinder piston mechanism 15 includes a piston 16 slidably provided in a cylinder, a first cylinder chamber 18 formed on the valve 24 side, and a second cylinder chamber 20 incorporating a spring 22 on the outside. The second cylinder chamber 20 incorporating the spring 22 is FIG. As shown in the schematic structure of the main valve 10 shown in FIG. 1, the main valve secondary side communicates with the internal passage in the rod of the piston 16.
[0052]
The main valve 10 is opened and closed by opening and closing a remotely controlled conductive valve 30 provided after a stop valve 26 and an orifice 28 provided in a pipe branched from the primary side. A manual start valve 32 is provided in parallel with the conductive valve 30. The secondary side of the conductive valve 30 is connected to the first cylinder chamber 18 of the main valve 10 via the pressure regulating valve 12 of the present invention.
[0053]
The pressure regulating valve 12 of the present invention includes a primary pressure port P1, a cylinder port CL, a pilot port PL, and a secondary pressure port P2. The primary pressure port P <b> 1 is connected to the secondary side of the conductive valve 30, and the primary side pressure of the main valve 10 is supplied by opening the conductive valve 30 or the manual activation valve 32.
[0054]
The cylinder port CL is connected to the first cylinder chamber 18 of the main valve 10. The pilot port PL and the secondary pressure port P2 are connected to the secondary side of the main valve 10 via the test water control valve 34. The test water control valve 34 is a three-way switching valve, and is switched so that the secondary side of the main valve 10 and the pressure regulating valve 12 side communicate with each other in the normal monitoring state.
[0055]
An automatic drain valve 36 and a test water discharge valve 38 are connected in parallel to the secondary side of the test water control valve 34, and the secondary side is connected to the water pipe. A pressure switch 40 is provided on the secondary side of the test water control valve 34, and the flow of pressurized water when the test water discharge is performed by opening the test water discharge valve 38 and opening the main valve 10 can be detected from the pressure change. I am doing so.
[0056]
FIG. 2 is an explanatory view of a pressure adjusting mechanism in which the pressure adjusting valve 12 of the present invention shown in FIG.
[0057]
The pressure-regulating valve 12 represented as a symbol has two switching positions shown separately on the left and right, which are determined by the spring load of the pressure setting spring 60 provided on the left side and the secondary pressure applied to the right pilot port PL. Switch with balance of power.
[0058]
The second valve body 100 controls the amount of communication between the primary pressure port and the cylinder port CL and the secondary pressure port P2 by the water pressure of the pilot port PL. This is a disconnected state, and the amount of communication increases as the pilot port PL pressure increases.
[0059]
When the secondary pressure applied to the pilot port PL by operating the main valve 10 is lower than the specified pressure that is the adjustment target on the secondary side of the main valve 10 determined by the pressure setting spring 60, the switching position is on the left side of the figure, The primary pressure port P1 is in communication with the cylinder port CL, and the secondary pressure port P2 is in a state of being squeezed and communicated with the primary pressure port P1 and the cylinder port CL by the second valve body 100.
[0060]
When the secondary pressure applied to the pilot port PL becomes higher than the specified pressure determined by the pressure setting spring 60, the pressure regulating valve 12 is switched to the right switching position. At the switching position on the right side, the primary pressure port P1 is disconnected from the cylinder port CL, and the cylinder port CL and the secondary pressure port P2 are completely communicated.
[0061]
Further, a closed delay valve 14 is provided at a branch portion of the cylinder port CL, the secondary pressure port P2 and the pilot port PL of the pressure regulating valve 12. This closing delay valve 14 is integrally incorporated in the pressure regulating valve 12 of the present invention, and forms an orifice flow path between the cylinder port CL and the pilot port PL communicating with the secondary side of the main valve 10 and is always in communication. Therefore, the closing delay portion 14 softens the impact when closing the main valve 10 by slowly removing the pressurized water from the first cylinder chamber 18 when closing the main valve 10.
[0062]
Here, the operation from the main valve opening to the head sprinkling pressure control and further the main valve stop will be described for the pressure adjusting mechanism of FIG.
[0063]
In the steady monitoring state, both the conductive valve 30 and the manual start valve 32 are closed, the valve 24 of the main valve 10 is closed by the force of the spring 22, and pressurized water from the water supply pipe is applied only to the primary side. Yes. If a fire has occurred in the section corresponding to the main valve 10 in this state, the conductive valve 30 is opened by remote control. Of course, the manual activation valve 32 may be manually opened when in the field.
[0064]
When the conductive valve 30 is opened, the pressurized water applied to the primary side of the main valve 10 is supplied to the primary pressure port P1 of the pressure regulating valve 12 through the stop valve 26 and the conductive valve 30, and passes through the pressure regulating valve 12. Is supplied from the cylinder port CL to the first cylinder chamber 18 of the main valve 10.
[0065]
The pressurized water passing through the pressure regulating valve 12 from the primary side is received by the first cylinder chamber 18, and the piston 16 strokes outward against the spring 22 to open the valve 24. When the valve 24 is opened, the primary side pressurized water flows to the secondary side and is supplied from the secondary side pipe to the water spray head via the butterfly valve 11 to start spraying water for fire extinguishing.
[0066]
When the valve 24 is opened and pressurized water flows to the secondary side, the secondary side pressurized water is supplied to the secondary pressure port P2 and the pilot port PL of the pressure regulating valve 12 via the test water control valve 34, respectively. A secondary pressure of the valve 10 is applied.
[0067]
While the force due to the secondary pressure of the main valve 10 applied to the pilot port PL is lower than the secondary-side specified pressure determined by the pressure setting spring 60, the valve 24 is kept open by the piston 16, whereby the secondary valve of the main valve 10 is opened. The side pressure increases toward the specified pressure. When the secondary pressure increases, the amount of communication flowing through the second valve body 100 increases from the initial state.
[0068]
Next, when the secondary pressure of the main valve 10 becomes higher than the specified pressure determined by the pressure setting spring 60 in the water discharge state from the water spray head in which the main valve 10 is opened, the pressure adjustment valve 12 is moved from the left position so far. Switch to the right position.
[0069]
When switched to the right position, the primary pressure port P1 is disconnected from the cylinder port CL, and the cylinder port CL is completely communicated with the secondary pressure port P2. For this reason, the pressurized water that has been the primary pressure in the first cylinder chamber 18 is caused by the differential pressure with the lower secondary pressure of the main valve 10 at that time, the second valve body 100 of the pressure regulating valve 12 and the closing delay. It flows to the secondary side of the main valve 10 through the valve 14, and the pressure in the first cylinder chamber 18 is thereby lowered.
[0070]
When the pressure in the first cylinder chamber 18 decreases, the piston 16 strokes in a direction to close the valve 24 due to the force of the spring 22 and the secondary pressure introduced into the second cylinder chamber, and the opening degree of the valve 24 is small. By doing so, the secondary pressure is lowered to the specified pressure.
[0071]
Similarly, the piston cylinder of the main valve 10 is switched by switching the valve according to the magnitude relationship of the force due to the secondary pressure applied to the pilot port PL with respect to the secondary specified pressure determined by the spring load of the pressure setting spring 60 of the pressure adjusting valve 12. The mechanism 15 opens and closes the valve 24 so as to keep the secondary pressure at the specified pressure, whereby the pressurizing water supplied to the secondary water spray head is adjusted to the specified pressure.
[0072]
When the fire is extinguished due to water discharge from the water spray head, the conductive valve 30 is closed. When the conduction valve 30 is closed, the supply of the primary pressurized water to the primary pressure port P1 of the pressure adjustment valve 12 is cut off. At this time, the pressure adjustment valve 12 is in the switching position on the left side, but the pressure of the pilot port PL is applied. Therefore, the amount of flow due to the communication between the cylinder port CL and the secondary pressure port P2 is larger than that in the initial state.
[0073]
Further, the cylinder port CL and the secondary pressure port P2 are communicated with each other by a bypass flow path of the closing delay valve 14. Therefore, the pressurized water at the primary pressure in the first cylinder chamber 18 is the total flow rate of the throttle flow rate determined by the second valve body 100 of the pressure regulating valve 12 and the closing delay valve 14, and the secondary side of the main valve 10. The pressure in the primary cylinder chamber 18 decreases.
[0074]
As the pressure in the first cylinder chamber 18 decreases, the piston 16 strokes quickly in the direction to close the valve 24 until the valve 24 is completely closed, and thereafter, the pressure of the pilot pressure PL is just before the valve 24 is completely closed. The second valve body 100 is brought into a substantially closed state in the initial state due to the lowering of the flow rate, and only the flow rate of the closing delay valve 14 is reached. The valve 24 strokes in a gently closing direction, and the valve 24 is closed without causing an impact. It returns to the initial state where the primary side is filled with pressurized water.
[0075]
On the other hand, a test circuit on the secondary side of the test water control valve 34 is used in an operation test for periodically checking the pressure adjusting mechanism. This test circuit can perform an actual water discharge test equivalent to actually discharging pressurized water without discharging water to the water spray head side even when the main valve 10 is opened.
[0076]
That is, during the test, the butterfly valve 11 is closed, and the test water control valve 34 is switched from the pressure regulating valve 12 side to the test water discharge valve 38 side. In this state, for example, when the motor-operated valve 30 is opened by remote operation, the pressurized water on the primary side is supplied to the first cylinder chamber 18 of the piston cylinder mechanism 15 via the pressure adjustment valve 12, and the piston 16 resists the spring 22. And by opening the valve 24, the pressurized water is flowed to the secondary side.
[0077]
The pressurized water flowing into the secondary side is discharged from the test water control valve 34 through the test water discharge valve 38. At this time, the test water discharge valve 38 flows the water discharge flow rate corresponding to the number of water spray heads connected to the secondary side of the main valve 10, for example, and the same operation state as when water is actually discharged from the water spray head is obtained.
[0078]
The automatic drain valve 36 is automatically opened when the test water discharge valve 38 is closed, and drains pressurized water from the main valve 10. During this test, since the secondary pressure of the main valve 10 is not applied to the pilot port PL of the pressure adjustment valve 12, the pressure adjustment operation is not performed.
[0079]
FIG. 3 is a cross-sectional view showing an embodiment of the pressure regulating valve 12 of the present invention used in the pressure regulating mechanism of FIGS.
[0080]
In FIG. 3, the pressure regulating valve 12 of the present invention has a case 44 attached to the upper portion of a body 42 and a cap 45 attached to the upper portion thereof. A primary pressure port P1 is provided on the right side of the body 42, and a pilot port PL is provided on the left side of the body 42.
[0081]
A secondary pressure port P <b> 2 is provided at the lower portion of the body 42. Further, a cylinder port CL is provided at a position of a broken line perpendicular to the spool valve 70 built in the body 42. The position of the cylinder port CL can be seen from FIG. 4 showing a cross section orthogonal to FIG. A closing delay valve 14 is incorporated at a position facing the cylinder port CL in FIG.
[0082]
Referring again to FIG. 3, the pilot port PL provided on the left side of the body 42 communicates with a diaphragm pressure chamber 46 provided on the upper side of the body 42. A rubber diaphragm 48 is incorporated in the diaphragm pressure chamber 46, and the central portion of the diaphragm 48 is supported by two pressers 50, 52. The presser 52 is passed through the embedded bolts 56 on the upper part of the presser 50, nut It is fixed at 58.
[0083]
A pressure setting spring 60 for setting a specified pressure as an adjustment target is incorporated between the presser foot 52 of the diaphragm 48 and the spring seat 62 at the top of the case 44. The adjustment bolt 64 is screwed in and fixed to the spring seat 62 above the pressure setting spring 60, and a stroke length that determines the spring load of the pressure setting spring 60 by the adjustment bolt 64 is set by the lock nut 66.
[0084]
A primary pressure port P1 provided on the right side of the body 42 communicates with the primary pressure introduction chamber 76 in the center of the body. A spool hole 72 reaching the diaphragm pressure chamber 46 is formed in the upper part of the primary pressure introduction chamber 76, and a spool hole 84 is also provided in the plug 80 attached to the lower part of the primary pressure introduction chamber 76. The spool valve 70 is incorporated in the slidable parts 72 and 84.
[0085]
The upper end of the spool valve 70 is in contact with the lower portion of the presser foot 50 of the diaphragm 48, and the lower end of the spool valve 70 is in contact with the end face of the plug 88 screwed from the lower portion following the plug 80. Further, a valve spring 90 is incorporated at a position where the primary pressure introduction chamber 76 of the spool valve 70 is incorporated, and the spool valve 70 is urged upward.
[0086]
Seals 74 and 86 are respectively provided at the position of the spool hole 72 at the upper part of the spool valve 70 and the position of the spool hole 84 of the plug 80 at the lower part of the spool valve 70, and the diaphragm pressure chamber 46 and the primary pressure introducing chamber 76 are provided. And the primary pressure introduction chamber 76 and the secondary pressure introduction chamber 78 therebelow are partitioned in a sealed state. Note that a seal 82 is also provided at a part where the plug 80 is assembled to the body 40. Here, as the seals 74, 82, 86, for example, O-rings are used.
[0087]
The spool valve 70 forms an internal passage 96 in the internal axial direction. The internal passage 96 communicates with a trapezoidal portion on the lower side of the spool hole 72 opened to the primary pressure introducing chamber 76 on the upper side of the spool valve body 70 by providing a communication hole 98. A flange-like portion forming the upper portion of the valve spring 90 in the primary pressure introduction chamber 76 is spooled by a valve seat 94 formed in an opening of a large-diameter hole that follows the spool hole 72 with respect to the primary pressure introduction chamber 76. A first valve portion of the valve 70 is configured. For this reason, the valve part 92 becomes a 1st valve body, and the valve seat 94 becomes a 1st valve seat. When the diaphragm 48 moves upward against the pressure setting spring 60, the first valve portion 92 is in contact with the first valve seat 94 and communicates via the primary pressure introduction chamber 76. The communication between the primary pressure port P1 and the cylinder port CL is disconnected.
[0088]
The internal passage 96 of the spool valve 70 has an opening at the spool tip located in the secondary pressure introduction chamber 78 as the second valve body 100 of the second valve portion, and the contact surface of the plug 88 with which the spool tip contacts. The second valve seat 102 is used. The second valve body 100 at the lower end of the spool of the internal flow path 96 located in the secondary pressure introducing chamber 78 at the initial position of the illustrated spool valve 70 contacts the contact surface of the plug 88 and the second valve seat 102. Communication is interrupted.
[0089]
Here, no sealing seal is provided between the second valve body 100 and the second valve seat 102, and conversely, the lower edge of the spool constituting the second valve body 100 has a rounded edge. It is rounded. For this reason, the flow of pressurized water squeezed to the secondary pressure port P2 from the primary pressure introduction chamber 76 having a high pressure through the internal passage 96 of the spool valve 70 is steadily generated.
[0090]
It is to be noted that a seal is not provided between the second valve body 100 and the second valve seat 102 is a closing delay valve 14 which will be described later. When the bypass passage 104 is completely closed and set, the main valve 10 In order to prevent the situation where the valve cannot be closed, a slight drainage channel is provided.
[0091]
As shown in FIGS. 1 and 2, the flow of the pressurized water is such that the temperature difference of the secondary side pipe between the first cylinder chamber 18 and the secondary side of the main valve 10 is closed in the normal state where the main valve 10 is closed. Even if a differential pressure due to the above occurs, the differential pressure is eliminated by a slight flow through the internal passage 96 of the spool valve 70 between the cylinder port CL and the secondary pressure port P2.
[0092]
Next, the closing delay valve 14 of FIG. 4 will be described. The closing delay valve 14 includes a needle valve 105, and the needle valve 105 has a tip inserted into the bypass passage 104. The bypass passage 104 is connected to the cylinder port communication portion 75 leading to the cylinder port CL with a spool valve. 70 It communicates through the surroundings.
[0093]
The bypass passage 104 passes through the needle valve 105 and then communicates with the diaphragm pressure chamber 46 by the bypass passage 106 through the inside of the closing delay valve 14, and the diaphragm pressure chamber 46 communicates with the pilot port PL as shown in FIG. is doing. That is, the closing delay valve 14 is provided with a needle valve 105 in a bypass passage 104 connecting the cylinder port CL in FIG. 4 and the pilot port PL in FIG. 3 to determine the bypass flow rate.
[0094]
An adjusting bolt 110 is integrally formed behind the needle valve 105, and the adjusting bolt 110 is screwed into the plug 108. By tightening or loosening the adjusting bolt 110, the pushing amount of the needle valve 105 with respect to the bypass passage 104 is changed. The opening degree of the valve 105 is determined. The adjustment position of the needle valve 105 by the adjustment bolt 110 is fixed by tightening by the lock nut 112.
[0095]
Next, the operation of the pressure regulating valve of the present invention shown in FIGS. 3 and 4 will be described with reference to FIGS.
[0096]
FIG. 5 shows the operation of the pressure regulating valve 12 according to the present invention when the conductive valve 30 is opened and the main valve 10 is opened for discharging water from the water spray head in FIG.
[0097]
When the conduction valve 30 is opened, the primary pressure water of the main valve 10 is supplied to the primary pressure port P1 in FIG. 5A via the conduction valve 30, and the primary pressure port P1 is connected to the primary pressure port P1. Since the first valve body 92 of the spool valve 70 is open at this time, the cylinder port CL formed in the orthogonal direction in FIG. 5B passes around the spool valve 70. The primary pressure of the pressurized water is supplied from the cylinder port CL to the first cylinder chamber 18 of the main valve 10 in FIG.
[0098]
For this reason, the piston 16 in FIG. 1 strokes against the spring 22 and opens the valve 24 to flow the pressurized water to the primary side to the secondary side and start discharging water from the water spray head. While the main valve 10 starts to open and the secondary pressure is lower than the specified pressure determined by the spring load of the pressure setting spring 60, the operating state of FIGS. 5A and 5B is maintained, and the valve 24 of the main valve 10 continues to open. As a result, the secondary pressure increases toward the specified pressure.
[0099]
When the valve 24 is opened, the secondary pressure enters the diaphragm pressure chamber 46, so that the diaphragm 48 is pushed up a little. Therefore, the spool valve 70 is slightly raised, the lower end is slightly separated from the second valve seat 102, and the flow rate to the secondary pressure port P2 is slightly increased.
[0100]
FIG. 6 shows the operating state of the pressure regulating valve 12 according to the present invention when the secondary pressure becomes higher than the specified pressure during water discharge after the main valve 10 is opened. When the secondary pressure of the main valve 10 becomes higher than the specified pressure, the secondary pressure applied from the pilot port PL to the diaphragm pressure chamber 46 also rises, and the diaphragm 48 pushes up the pressure setting spring 60. With the movement of the diaphragm 48, the spool valve 70 strokes upward, the first valve body 92 abuts on the valve seat, and the cylinder port CL positioned in the direction orthogonal to the primary pressure port P1, that is, FIG. ) Disconnection of cylinder port CL.
[0101]
At the same time, when the spool valve 70 moves upward, the second valve body 100 at the lower end of the spool further moves away from the valve seat 102 and completely opens the flow path. For this reason, as shown in FIG. 6B, the pressurized water applied to the cylinder port CL from the first cylinder chamber 18 of the main valve 10 passes from the upper part of the spool valve 70 through the internal passage 96 to the lower secondary pressure introduction chamber 78. To the secondary side of the main valve 10 of FIG. 1 through the secondary pressure port P2.
[0102]
There is almost no loss when pressurized water flows from the cylinder port CL to the secondary pressure port P2 through the internal passage 96 of the spool valve 70, and the pressurized water is quickly responsive to the differential pressure between the first cylinder chamber 18 and the secondary side. To lower the pressure in the first cylinder chamber 18, and the piston 16 of the main valve 10 moves quickly to move in the direction to close the valve 24, thereby lowering the increased secondary pressure to a specified pressure.
[0103]
At the same time, it flows from the cylinder port CL to the pilot port PL via the closing delay valve 14, but the flow rate to the secondary pressure port P2 is larger.
[0104]
Of course, when the secondary pressure of the main valve 10 drops below the specified pressure from the state of FIG. 6, the operation state returns to FIG. 5 again and the valve 24 of the main valve 10 is opened so that the secondary pressure is restored to the specified pressure. To drive.
[0105]
FIG. 7 shows the operation of the pressure regulating valve 12 according to the present invention when the main valve 10 is closed after extinguishing the fire by discharging water from the water spray head. When the motor-operated valve 30 that has been opened in FIG. 1 is closed, the supply of pressurized water to the primary pressure port P1 of the pressure regulating valve is cut off.
[0106]
When the pilot valve 30 is closed, because the secondary pressure of the pilot port PL pressurizes the diaphragm 48, the spool valve 70 is somewhat raised from the initial state, and the second valve body 100 is slightly raised. Yes. Therefore, the pressurized water in the cylinder port CL is the sum of the flow rate of the second valve body 100 and the flow rate of the pressurized water determined by the throttle flow rate of the needle valve 105 that constitutes the closing delay valve 14. The stroke is lowered and the valve 24 is stroked quickly in the closing direction.
[0107]
Thereafter, when the valve 24 is almost completely closed, the secondary pressure of the pilot port PL decreases, so that the diaphragm 46 returns to the initial position as shown in FIGS. The communication between the cylinder port CL shown in B) and the secondary pressure port P2 on the lower side of the body is blocked.
[0108]
Then, as shown in FIG. 7B, only the flow of pressurized water determined by the throttle flow rate of the needle valve 105 constituting the closing delay valve 14 provided in the pressure regulating valve 12 is passed from the cylinder port CL through the pilot port PL. As the pressure in the first cylinder chamber 18 of the main valve 10 is reduced according to the flow of the pressurized water, the piston 16 is gradually pushed by the spring 22 and is determined by the delay amount of the closing delay valve 14. After a predetermined time, the valve 24 is slowly closed, and water discharge from the water spray head is stopped.
[0109]
Here, the flow of the pressurized water from the first cylinder portion 18 to the secondary side of the main valve when the main valve 10 is stopped is added to the throttle amount determined by the needle valve 105 of the closing delay valve 14 shown in FIG. The amount of leakage of the second valve body 100 passing through the internal passage of the spool valve 70 is added, but the amount of leakage in the closed state of the second valve body 100 is negligible, and is substantially a closed delay valve. A closing delay determined by a bypass amount of 14 is performed.
[0110]
FIG. 8 is a diagram showing an operation comparison of the conventional valve 24 and the valve 24 of the present embodiment from when the pilot valve 30 is closed until the valve 24 is completely closed, and shows the operation when the valve is closed in the same time. The vertical axis shows the pressure in the cylinder chamber on the horizontal axis.
[0111]
A dotted line a represents a transition of the conventional pressure change, and the pressure is decreased only from the orifice channels 180, 250, and 302. Therefore, the pressure is decreased at a constant inclination, and the valve is closed at a constant speed. For this reason, in order to completely close the valve within the predetermined time t1, the orifice channels 180 and 250 must be set to a slightly higher flow rate.
[0112]
The solid line b is a transition of the pressure change of this embodiment, and when the pilot valve 30 is closed as shown by the solid line b up to time t2, it flows from both the second valve body 100 and the closing delay valve 14, so the dotted line The pressure can be reduced more quickly than a, and the valve 24 moves faster than the conventional one. When the pressure decreases and decreases to a predetermined pressure, the second valve body 100 is closed at time t2, and the pressure is decreased at a flow rate determined only by the closing delay valve 14 until the subsequent valve 24 is completely closed. Therefore, the valve 24 is gradually closed. That is, in the case where the valve is set to be completely closed at the same time t1 as in the conventional case, the second valve body 100 and the closing delay valve 14 can be used to close the valve 24 immediately before the valve 24 is fully shown. The throttle flow rate of the valve 14 can be set smaller than the throttle flow rate of the conventional orifice flow path, and can be closed slowly in the remaining time t1-t2, so that the impact at the time of closing can be suppressed.
[0113]
In the above embodiment, the closing delay valve 14 is integrally incorporated in the body 42 of the pressure regulating valve 12, but a bypass port is provided in the body 42, and the closing delay valve is connected to the bypass port by piping. You may connect.
[0114]
In the above embodiment, a needle valve capable of varying the bypass throttle amount is used as an example of a closed delay valve. However, the bypass amount is fixed by providing an orifice or the like in the bypass passage. Of course, it may be an installed closing delay valve.
[0115]
In the above-described embodiment, the closed delay valve is configured to connect the cylinder port CL and the pilot port PL, but may be configured to connect the cylinder port CL and the secondary pressure port P2.
[0116]
In the above embodiment, the pressure adjustment when the automatic valve used in the tunnel fire extinguishing equipment is the main valve is taken as an example, but in addition to this, the piston provided in the branch pipe of the indoor sprinkler fire extinguishing equipment An automatic alarm valve having a cylinder mechanism as an actuator may be used as a main valve, and pressure adjustment may be performed by the pressure adjustment valve according to the present invention. The present invention is not limited by the main valve to be controlled. Pressure adjustment can be performed on the valve.
[0117]
【The invention's effect】
As described above, according to the present invention, when the secondary pressure of the main valve becomes higher than the specified pressure as the adjustment target during water discharge from the water spray head with the main valve open, the built-in pilot valve mechanism The cylinder port was disconnected from the port and disconnected
Since the cylinder port is connected to the secondary pressure port and the pressurized water in the main valve cylinder chamber is allowed to flow to the main valve secondary side with low loss, the followability of the main valve for adjusting the pressure against the fluctuation of the secondary pressure is improved. Pressure adjustment that keeps the secondary pressure with good response at the specified pressure can be realized.
[0118]
In addition, since the pressure is adjusted by flowing pressurized water from the main valve cylinder chamber through the pressure regulating valve to the secondary side of the main valve, the conventional pressure regulating valve for flowing pressurized water from the main valve cylinder chamber to a distribution pipe open to the atmosphere is used. Such a water distribution pipe becomes unnecessary, construction is easy and the cost can be reduced. In addition, it is possible to prevent the pressure regulating valve from freezing via the water pipe due to cold air in winter.
[0119]
Also, when closing the valve, it flows to the main valve secondary side from both the second valve part and the closing delay valve until halfway, and only the closing delay valve is drained immediately before closing the valve, so the valve is closed. The shock at the time can be suppressed.
[0120]
In addition, since the second valve portion does not have a sealing structure, even if the bypass flow path by the closed delay valve is closed, the main valve cannot be closed because the second valve portion is drained little by little. be able to.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a pressure control mechanism of a main valve using a pressure regulating valve of the present invention.
FIG. 2 is an explanatory diagram of a main valve pressure control mechanism that symbolizes the pressure regulating valve of the present invention in FIG.
FIG. 3 is a sectional view showing an embodiment of a pressure regulating valve according to the present invention.
4 is a cross-sectional view in a direction orthogonal to FIG.
FIG. 5 is a diagram illustrating the operation of the pressure regulating valve according to the present invention when the main valve is opened with the motor-operated valve open.
FIG. 6 is an explanatory diagram of the operation of the pressure regulating valve according to the present invention when the secondary pressure of the main valve becomes higher than a specified pressure during water spray head discharge.
FIG. 7 is an operation explanatory view of the pressure regulating valve according to the present invention when the main valve is closed with the motor-operated valve closed.
FIG. 8 is a diagram for explaining an operation comparison between the prior art and the present embodiment until the main valve is closed;
FIG. 9 is an explanatory view of a pressure adjustment mechanism of an atmospheric side drainage method in which pressurized water from a main valve cylinder is passed through a pressure adjustment valve to a drain pipe open to the atmosphere.
FIG. 10 is an explanatory diagram of a pressure adjustment mechanism of an atmospheric drainage system that represents the pressure adjustment valve of FIG. 9 as a symbol.
FIG. 11 is an explanatory view showing a schematic structure of a main valve and a pressure regulating valve of a pressure regulating mechanism of an air side drainage system.
FIG. 12 is a diagram for explaining the operation when the main valve is opened with the motor-operated valve opened in FIG.
FIG. 13 is an operation explanatory diagram when the secondary pressure of the main valve becomes higher than a specified pressure during water spraying head water discharge.
FIG. 14 is an operation explanatory diagram when the main valve is closed with the motor-operated valve closed in FIG.
FIG. 15 is an explanatory view of a pressure adjustment mechanism of a secondary side drainage system in which pressurized water from a main valve cylinder flows to the main valve secondary side through a pressure adjustment valve.
FIG. 16 is an explanatory diagram of a pressure adjustment mechanism of an atmospheric drainage system that represents the pressure adjustment valve of FIG. 15 as a symbol;
17 is a cross-sectional view showing the structure of a pressure regulating valve used in FIGS. 15 and 16. FIG.
[Explanation of symbols]
10: Main valve
11: Butterfly valve
12: Pressure regulating valve
14: Closure delay valve
15: Piston cylinder mechanism (main valve actuator)
16: Piston
18: First cylinder chamber
20: Second cylinder chamber
22: Spring
24: Valve
26: Stop valve
28: Orifice
30: Motorized valve (for starting and stopping the main valve)
32: Manual start valve
34: Water control valve for testing
36: Automatic drain valve
38: Test water discharge valve
40: Pressure switch
42: Body
44: Case
45: Cap
46: Diaphragm pressure chamber
48: Diaphragm
50, 52: Presser foot
56: Embedded bolt
58: Nut
60: Pressure setting spring
62: Spring seat
64: Adjustment bolt
66: Lock nut
70: Spool valve
72:84: Spool hole
74, 82, 84: Seal (O-ring)
76: Primary pressure introduction chamber
78: Secondary pressure introduction chamber
80, 88: Plug
90: Valve spring
92: First valve body
94: 1st valve seat
96: Internal passage
98: Communication hole
100: Second valve body
102: Second valve seat
104, 106: Bypass passage
105: Needle valve
108: Plug
110: Adjustment bolt
112: Lock nut
P1: Primary pressure port
P2: Secondary pressure port
CL: Cylinder port
PL: Pilot port

Claims (4)

For the piston cylinder mechanism for opening and closing the main valve installed in the pipe for supplying pressurized water, the primary pressure and the secondary pressure are switched and introduced into one first cylinder chamber partitioned by the piston, and the other second cylinder chamber Pressure adjustment that constantly introduces secondary pressure into the cylinder and opens and closes the valve body by the movement of the piston corresponding to switching between the primary pressure and the secondary pressure with respect to the first cylinder chamber, thereby adjusting the secondary pressure to a specified pressure. In the valve,
A primary pressure port for connecting the primary side of the main valve to introduce a primary pressure;
A cylinder port connecting the first cylinder chamber of the main valve;
A secondary pressure port for connecting a secondary side of the main valve to introduce a secondary pressure;
A pilot port for connecting a secondary side of the main valve and introducing a secondary pressure as a pilot pressure;
A pressure setting spring for setting a specified pressure on the secondary side of the main valve as an adjustment target;
A diaphragm that is displaced to a position where the force of the pressure setting spring and the force of the secondary pressure introduced from the pilot port are balanced;
When the secondary pressure is lower than a specified pressure in conjunction with the displacement of the diaphragm, the primary pressure port is communicated with the cylinder port to supply the primary pressure to the first cylinder chamber, and the secondary pressure A pilot valve mechanism that disconnects the cylinder port from the primary pressure port and communicates the cylinder port to the secondary pressure port .
A closed delay valve is provided between the cylinder port and the secondary pressure port or the pilot port so as to form a narrowed bypass path and flow pressurized water in the first cylinder chamber of the main valve to the secondary side of the main valve. A pressure regulating valve characterized by that. 2. The pressure regulating valve according to claim 1, wherein the closing delay valve is provided with a needle valve capable of adjusting a throttle in a bypass path formed between the cylinder port and the secondary pressure port or the pilot port. Pressure regulating valve characterized by The pressure regulating valve according to claim 1, wherein the pilot valve mechanism is
A spool hole formed through the diaphragm pressure chamber, the cylinder port communication portion, the primary pressure introduction chamber, and the secondary pressure introduction chamber in order;
A spool valve slidably accommodated in the spool hole;
A first valve portion integrally formed with the spool valve that opens and closes between the cylinder port communication portion and the primary pressure introduction chamber;
The opening direction is controlled in relation to the control of the closing direction of the first valve part due to the pressure increase of the pilot port, and the closing direction is related to the control of the opening direction of the first valve part due to the pressure drop of the pilot port. And a second valve unit for controlling the pressure control valve. In the pressure regulating valve according to claim 3,
The first valve portion includes a valve seat formed in a spool hole opening portion of the primary pressure introduction chamber, and a valve body formed in a flange shape at the position of the primary pressure introduction chamber on the outer periphery of the spool valve. And
The second valve portion includes an internal flow path that opens from the cylinder port communicating portion through the inside of the spool to the spool front end of the secondary pressure introduction chamber, and a valve body that is formed at the spool front end portion that opens the internal flow path. And a valve seat that is an abutting surface of a plug member against which a valve body at the tip of the spool abuts .

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