JP2008101698A - Automatic valve device and automatic drain valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve an operating efficiency during test and adjustment by shortening a closing time of an automatic valve body. <P>SOLUTION: The automatic valve device includes the automatic valve body 10 for opening a valve 28 by a piston 32 operated by a supply of pressurized water to a cylinder chamber 30, an activating valve 12 for supplying primary-side pressurized water to the cylinder chamber 30 of the automatic valve body 10 by opening operation and stopping the supply of the pressurized water by closing operation, and an automatic drain valve 14 for introducing secondary-side pressurized water of the automatic valve body 10 and the pressurized water to the cylinder chamber 30, closing the valve when the pressure of the introduced pressurized water is equal to or higher than a predetermined pressure and draining the introduced pressurized water by opening the valve when the pressure of the introduced pressurized water is lower than the predetermined pressure. The automatic drain valve 14 contains a manual opening mechanism for draining the introduced pressurized water by forcibly opening the valve by such a manual operation as to push an operation handle 16 under such a condition that the valve is closed by the introduced pressurized water at pressure equal to or higher than the predetermined pressure. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

The present invention relates to an automatic valve device and an automatic drain valve that are used in a water spray facility or a fire extinguishing facility installed in a tunnel or the like.

  Conventionally, as an automatic valve device (simultaneous opening valve) used in a tunnel water spray facility or an open-type sprinkler facility, for example, there is the one shown in FIG.

  In FIG. 5, the automatic valve device includes an automatic valve main body 10, a start valve 12, and an automatic drain valve 100. When the start valve 12 is started remotely or manually from the normal monitoring state, the pressurized water on the primary side of the automatic valve body 10 flows into the cylinder chamber 30 and pushes up the piston 32 to open the valve 28. For example, the open sprinkler head 26 Sprinkle water for fire extinguishing.

  The automatic drain valve 100 is automatically connected to the startup pipe on the secondary side of the startup valve 12 to prevent malfunction due to seat leakage of the startup valve 12 and to drain residual water in the secondary side pipe after the automatic valve body 10 is activated. The secondary side of the drain valve main body 10 is connected by piping.

  FIG. 6 shows an example of a conventional automatic drain valve. In FIG. 6, an automatic drain valve 100 has a ball valve body 102 disposed so as to be openable and closable with respect to a valve seat 104 that partitions the primary side and the secondary side in the valve body, and the ball valve body 102 is disposed on the secondary side of the valve body. The stem 106 is disposed in contact with the tip, and the stem 106 is biased by the spring 108 in the valve opening direction.

  When the introduced pressurized water from the primary port is less than the specified pressure, the ball valve body 102 is pushed up through the stem 106 by the force of the spring 108 and held in the valve open position. , The force of pressurized water applied to the ball valve body 102 causes the stem 106 to retreat against the spring 108 to bring the ball valve body 102 into the valve closed position.

  The automatic drainage 100 is always in an open state in the steady monitoring state where the start valve 12 is closed, and even if primary side pressurized water leaks into the start pipe that leads to the cylinder chamber due to seat leakage of the start valve 12. The water is drained from the automatic drain valve 100 in the open state, thereby preventing malfunction due to supply to the cylinder chamber.

  When the pressurized water on the primary side is supplied to the starting pipe as the starting valve 12 is opened remotely or manually, the automatic drain valve 100 is closed when the introduced pressurized water exceeds a predetermined pressure. Drainage from the secondary side of the valve body 10 is stopped. For this reason, the pressurized water of the starting pipe is supplied to the cylinder chamber, the piston is pushed up to open the valve body, and the pressurized water is supplied to the secondary side to spray water from the open sprinkler head.

In order to stop watering, the start valve 12 is closed. When the start valve 12 is closed, the pressurized water flowing into the cylinder chamber of the automatic valve body 10 is drained to the secondary side of the automatic valve body 10, and the valve is gradually closed. At this time, the closing time of the automatic valve body is proportional to the drainage speed of the cylinder chamber, and the closing time is shortened as the drainage speed of the cylinder chamber is faster. The drainage speed of the cylinder chamber correlates with the flow rate on the secondary side of the automatic valve body 10, and the drainage efficiency of the cylinder chamber increases as the flow rate increases, that is, the flow rate increases.
JP 2005-248970 A

  However, in such an automatic valve device equipped with the conventional automatic drain valve, when the automatic valve device is repeatedly opened and closed during the test adjustment of the automatic valve device, the closing time of the automatic valve body Is determined by the drainage speed of the cylinder chamber, which is determined by the flow rate on the secondary side of the automatic valve body 10, and it may take time to close, and there is a problem that it takes time to adjust the test.

An object of this invention is to provide the automatic valve apparatus and automatic drain valve which shorten the closing time of an automatic valve main body, and improve the working efficiency of test adjustment.

The present invention provides an automatic valve device. The present invention
An automatic valve body that opens the valve by the operation of a piston by supplying pressurized water to the cylinder chamber;
An activation valve for supplying primary pressurized water to the cylinder chamber of the automatic valve body by an opening operation and stopping the supply of pressurized water by a closing operation;
Automatic that introduces the pressurized water on the secondary side of the automatic valve body and the pressurized water to the cylinder chamber, closes the valve when the introduced pressurized water is above the specified pressure, and opens the valve when the introduced pressurized water is below the specified pressure to drain the introduced pressurized water A drain valve,
In an automatic valve device equipped with
The automatic drain valve is characterized by providing a manual opening mechanism for forcibly opening and draining the valve by manual operation in a state where the introduced pressurized water is at a specified pressure or higher and the valve is closed.

Here, the automatic drain valve
A valve body disposed so as to be openable and closable with respect to a valve seat separating the primary side and the secondary side in the valve body;
A first stem that connects one end to the valve body and slidably supports the other end relative to the valve body;
A first spring disposed on the first stem side and biasing the valve body in a closing direction;
The valve body is slidably supported on the valve body on the opposite side of the valve body coaxially with the first stem, and is provided with an operation handle on the outside. A second stem that is moved to an open position;
A second spring disposed between the second stem and the valve body and biasing the valve body in an opening direction;
The valve body is held in the open position when the introduced pressurized water is less than the prescribed pressure, and the valve body is moved to the closed position when the introduced pressurized water is above the prescribed pressure. Set as follows.

As another form of automatic drain valve,
A ball valve body arranged to be openable and closable with respect to a valve seat separating the primary side and the secondary side in the valve body;
A stem that is disposed on the secondary side of the valve body and has a ball valve element in contact with the tip;
A spring that urges the stem in the valve opening direction, pushes up the ball valve body to the open position when the introduced pressurized water is less than the specified pressure, and retracts the ball valve body to the closed position when the introduced pressurized water exceeds the specified pressure;
A drain hole penetrating the ball valve body,
An operation handle for rotating the ball valve body to a closed position where the drainage hole is disengaged from the valve seat and an open position where the drainage hole is opposed to the valve seat;
Is provided.

  Furthermore, this automatic drain valve is formed with a slide groove in the direction perpendicular to the drain hole on the outer periphery of the ball body, and a slide key connected to the operation handle is fitted into the slide groove, and the slide key is moved by the operation handle. The ball valve body is rotated between a closed position where the drainage hole is removed from the valve seat and an open position where the drainage hole faces the valve seat.

The present invention provides an automatic drain valve. The present invention relates to an automatic drain valve that closes a valve when the introduced pressurized water is above a specified pressure and opens the valve when the introduced pressurized water is less than the prescribed pressure to drain the introduced pressurized water. A manual opening mechanism is provided in which the valve is forcibly opened by manual operation to drain water while the valve is closed. The details of the automatic drain valve are the same as those of the automatic drain valve provided in the automatic valve device of the present invention.

  According to the present invention, since the automatic drain valve is provided with a manual drainage mechanism, when closing the automatic valve body that has been opened and opened by the start valve, the automatic drain valve is manually opened to close the automatic valve body. Drains quickly from the cylinder chamber and can be closed in a short time without depending on the flow rate on the secondary side, shortening the test adjustment time for repeated opening / closing and stopping of the automatic valve device. Can be made more efficient.

Further, not only for test adjustment of the automatic valve device, but also when it is desired to stop the automatic valve device that has been opened and opened urgently in a short time, the automatic drain valve can be easily temporarily stopped by manually opening it.

  FIG. 1 is an explanatory view showing an embodiment of an automatic valve device according to the present invention. In FIG. 1, the automatic valve device of the present embodiment includes an automatic valve body 10, a start valve 12, and an automatic drain valve 14.

  The automatic valve body 10 is provided with an inlet 20 for supplying pressurized water from the fire-extinguishing water pump facility to the valve body 18 and an outlet 22 for connecting an open sprinkler head 26 via a secondary pipe 24. . A partition wall 25 is provided in the valve body 18, and a valve 28 is arranged to be openable and closable with respect to a valve seat in a valve hole provided in the partition wall 25.

  A piston 32 is fixed to the valve 28, the piston 32 is slidably provided in the cylinder chamber 30, and a stem 34 is connected to the center of the piston 32, and the end side is taken out to the outside. Further, a spring 35 is disposed between the piston 32 and the valve body 18 side to urge the piston 32 in the closing direction of the valve 28.

  The start valve 12 is opened or closed by remote operation or manual operation, and the port C1 communicated with the inlet 20 of the automatic valve body 10 is connected by a pipe L1, and the secondary side is connected by a pipe L2 to a port C2 communicated with the cylinder chamber 30. Furthermore, it is connected to the automatic drain valve 14 by a pipe L3.

  Further, the secondary drain port 14 of the automatic valve body 10 is connected to the automatic drain valve 14 by a pipe L4. The automatic drain valve 14 is always open in the normal monitoring state in which the automatic valve body 10 is closed. Even if the pressurized water leaks due to a seal breakage of the start valve 12 or the like, the automatic drain valve 14 is drained to discharge the cylinder chamber 30. The malfunction of the automatic valve main body 10 due to the addition to is prevented.

  FIG. 2 is a cross-sectional view showing an embodiment of the automatic drain valve 14 of FIG. 2, the automatic drain valve 14 has a valve body 36, an inlet 38 is provided on the upper side of the valve body 36, and an outlet 40 is provided on the lower side. The inlet 38 is shown in FIG. In this way, pressurized water or secondary pressurized water for the cylinder chamber 30 on the automatic valve body 10 side is introduced by pipe connection, and the outlet 40 is connected to the drain pipe side.

  A partition wall 42 is formed inside the valve body 36, and a valve seat 44 is formed on the right side of the valve hole provided in the partition wall 42. A valve body 46 fitted with a seal 48 is provided on the valve seat 44 so as to be openable and closable. The valve body 46 is fixed to the tip of the first stem 50, and the first stem 50 is slidably assembled to the cover 45. A first spring 52 is disposed between the valve body 46 and the cover 45. The valve body 46 is urged in the closing direction.

  On the opposite side of the first stem 50 attached to the valve body 46, a second stem 54 is coaxially provided so as to be slidable with respect to the valve body 36. A handle 16 is attached. A second spring 56 is disposed between the second stem 54 and the valve body 46.

  In the initial state where pressurized water is not introduced into the inflow port 38, the valve body 46 is held in an open position in which the illustrated seal 48 is separated from the valve seat 44 by the balance between the first spring 52 and the second spring 56.

  The second stem 54 attached with the operation handle 16 compresses the second spring 56 by pushing the operation handle 16 by manual operation, abuts the distal end against the first stem 50, and pushes the first stem 50 outward. The valve body 46 can be operated in an opening direction in which the valve body 46 is pulled away from the valve seat 44.

Here, if the spring load of the first spring 52 in FIG. 2 is F1, and the spring load of the second spring 56 is F2,
F1 ≦ F2
In a balanced state, the valve body 46 is held at the open position shown in the figure.

  In this state, when pressurized water is introduced into the inlet 38 and the sum (F1 + F3) of the force F3 applied to the valve body 46 by the pressurized water and the spring load F1 of the first spring 52 exceeds the spring load of the second spring 56, F2 The valve body 46 strokes against the second spring 56 in the closing direction, and the seal 48 is brought into contact with the valve seat 44, whereby the valve is closed.

  The pressure of the introduced pressurized water for operating the valve body 46 to the closed position is set to be, for example, a pressure lower by a predetermined ratio than the pressure of the primary pressurized water with respect to the inlet 20 in the automatic valve body 10 of FIG. is doing.

  FIG. 3 is an explanatory diagram of the operating state of the automatic drain valve 14 of FIG. FIG. 3A shows an operating state when the pressure of the introduced pressurized water with respect to the inflow port 38 is lower than the predetermined closing pressure P0 set for the automatic drain valve 14.

  In this case, since the pressure P of the introduced pressurized water with respect to the inflow port 38 is less than the closing set pressure P0 set in the automatic drain valve 14, the valve body 46 is kept open and flows into the inflow port 38. The pressurized water is drained from the outlet 40 to the water distribution pipe through the part of the valve body 46 in the open state.

  The operation state of the automatic drain valve 14 in FIG. 3A is a steady monitoring state in which the automatic valve main body 10 is closed by closing the activation valve 12 in the automatic valve device of FIG. This is an operation when the seal is broken and pressurized water leaks.

  Further, the start valve 12 is opened and the automatic valve main body 10 is opened to start, then the start valve 12 is closed, and the pressurized water on the secondary side of the automatic valve body 10 is drained from the secondary side water distribution pipe 24 so that the pressurized water from the pipe L4 is automatically This is an operating state when the drain valve 14 is lowered to a pressure lower than the closing set pressure P0.

  FIG. 3B is an explanatory diagram of the automatic drain valve 14 in a closed state. The closed state of the automatic drain valve 14 in FIG. 3B is that the start valve 12 is opened remotely or manually in the automatic valve device of FIG. 1, and the primary pressurized water is supplied to the cylinder chamber 30 via the pipes L1 and L2. This is an operating state when the piston 32 is supplied and stroked in the opening direction, the valve 28 is opened, the pressurized water is supplied to the secondary side pipe 24 from the primary side, and the water is discharged from the open sprinkler head 26.

  In this case, the starting pressurized water for the cylinder chamber 30 of the automatic valve body 10 and the secondary pressurized water accompanying the opening of the valve 28 are introduced into the automatic drain valve 14 via the pipe L3 and the pipe L4. As shown in (B), when the pressure P of the introduced pressurized water exceeds the closing set pressure P0 of the automatic drain valve 14, the valve body 46 moves to the closed position, and the outflow of pressurized water to the secondary side is stopped.

  FIG. 3C shows an operation state in which the operation handle 16 is forcibly opened manually by pushing the operation handle 16 in the automatic closing state by supplying pressurized water in FIG. In the forced opening operation by manual operation, when the operation handle 16 is pushed in the direction indicated by the arrow as shown in FIG. 3C in the automatic closing state of FIG. 3B, the tip of the first stem is pushed by the push of the second stem 54. 50, the valve body 46 is forcibly opened by pushing the first stem 50 outward, and the pressurized water at the inlet 38 can be drained from the outlet 40.

  Forcibly opening the automatic drain valve 14 by manual operation as shown in FIG. 3C, after opening the start valve 12 in the automatic valve device of FIG. 1 and supplying pressurized water to the secondary side by opening the automatic valve body 10, This is performed when the start valve 12 is closed and the automatic valve body 10 is closed and stopped. That is, when the operation handle 16 of the automatic drain valve 14 is pushed in and forcedly opened as shown in FIG. 3C, the automatic drain valve 14 that has been automatically closed due to the secondary pressure is forcibly opened, thereby the pipe L3. Thus, the pressurized water in the cylinder chamber 30 of the automatic valve body 10 can be drained rapidly.

  As a result, the piston 32 is rapidly stroked with the drainage of the cylinder chamber 30, and the valve 28 can be operated to the closed position. Such forced opening of the automatic drain valve 14 by pushing in the operation handle 16 in FIG. 3C is the automatic drain valve 14 during the closing operation when the opening / closing operation for adjusting the automatic valve device is repeated in FIG. By pushing the operating handle 16 and forcibly opening it, the recovery time of the automatic valve body 10 to the closed state can be shortened, and the adjustment work can be made efficient.

  Further, when the automatic valve body 10 is opened and activated by the start valve 12 at the time of test adjustment or the like and it is desired to temporarily stop the water discharge during the water discharge from the secondary side, the automatic valve provided near the automatic valve body 10 is provided. By pushing the operating handle 16 of the drain valve 14 as shown in FIG. 3C and forcibly opening it, the secondary side water discharge can be temporarily stopped as necessary.

  Further, the automatic drain valve 14 shown in FIG. 2 is forcibly opened only while the operation handle 16 is pushed in. If the operation handle 16 is released, the first spring 52, the second spring 54 and the pressurized water introduced at that time are released. The valve body 46 automatically recovers and opens at a position determined by the pressure, and problems such as forgetting to recover due to manual operation do not occur.

  FIG. 4 is an explanatory view showing another embodiment of the automatic drain valve according to the present invention. FIG. 4A shows the automatic drain valve 14 in the initial state. The valve body 60 is provided with an inflow port 62 and an outflow port 64, and a ball valve body 66 is incorporated therein.

  The ball valve body 66 is supported at the open position in the initial state upon receiving contact of the tip of the stem 70 disposed on the outflow port 64 side. A valve seat 68 is formed below the ball valve body 66, and a stem 70 supported by holders 74 and 76 is positioned on the outlet 64 side through the valve seat 68. It is urged in the opening direction to move 66 away from the valve seat 68.

  In this embodiment, for example, four drain holes 78 are formed in the ball valve body 66 so as to penetrate therethrough in the direction perpendicular to the direction of the valve seat 68 in the illustrated initial state. Further, a slide groove 80 is formed on the left side of the ball valve body 66 in a direction perpendicular to the drain hole 78, and a slide key 82 is incorporated in the slide groove 80. The slide key 82 passes through the valve body 60 and is taken out to the outside. The distal end of the shaft 84 is fixed, and an operation handle 86 is attached to an outside extraction portion of the shaft 84.

  In the initial state of the automatic drain valve 14, for example, when pressurized water is introduced into the inlet 62 and the force applied to the ball valve body 66 by the pressurized water exceeds the spring load of the spring 72 provided on the stem 70, the ball valve body 66 is spring-loaded. The stem 70 is pushed down against 72 and brought into contact with the valve seat 68 to be in a closed state.

  In response to the movement of the ball valve body 66 due to the introduced pressurized water, the operation handle 86 is fitted into the slide groove 80 formed in the moving direction of the ball valve body 66 by the introduced pressurized water by the slide key 82 at the tip of the shaft 84. Therefore, the ball valve body 66 can be moved to the closed position in contact with the valve seat 68 by the pressure of the introduced pressurized water from the inflow port 62 without being obstructed by the operation mechanism by the operation handle 86.

  FIG. 4B is an explanatory diagram of a closed state when pressurized water equal to or higher than the closing set pressure P 0 of the automatic drain valve 14 determined by the spring load of the spring 72 is introduced into the inlet 62. That is, when the force received by the ball valve body 66 due to the pressure of pressurized water applied to the inlet 62 is equal to or higher than the closing set pressure P0 due to the spring load of the spring 72 pushing up the stem 70, The valve body 66 depresses the stem 70 against the spring 72 and comes into contact with the valve seat 68 to close the flow path.

  FIG. 4C shows an operation state in which the operation handle 86 is operated and forcibly opened in the automatic closing state of FIG. 4B. When it is desired to open the automatic drain valve 14 in the automatic closing state of FIG. 4B, when the operation handle 86 is rotated 90 ° toward the front, the ball valve body 66 is interposed via the shaft 84, the slide key 82 and the slide groove 80. Is rotated 90 ° in conjunction with the operation handle 86, whereby the drain hole 78 penetrating the ball valve body 66 is opposed to the valve hole of the valve seat 68, and the pressurized water from the inlet 62 passes through the drain hole 78. Flows to the outlet 64 and can be drained forcibly by manual opening.

  When the forcible opening operation is completed, the automatic drain valve 14 is restored to the automatic opening / closing operation state according to the pressure of the introduced pressurized water from the inlet 62 again by returning the operation handle 86 to the original position. To do.

  Here, in the embodiment of FIG. 4, the operation handle 86 is turned 90 ° to open the drain hole 78 of the ball valve body 66 and forcibly open it as shown in FIG. However, it is necessary to return the operation handle 86 by manual operation. However, if a return spring for returning the operation handle 86 to the initial position is assembled to the operation handle 86, only the operation handle 86 is released, and FIGS. Thus, it is possible to reliably prevent the operating handle 86 from being returned to the initial position and forgetting to return the operating handle 86 to the manual release position.

  In this embodiment, an automatic drain valve used for an automatic valve device of a tunnel water spray facility or an open type sprinkler fire extinguishing facility is taken as an example. The present invention can be applied as it is to an appropriate facility or apparatus that requires an automatic drain valve that is in an open state and is in a closed state at a set closing pressure or higher.

Further, the present invention includes appropriate modifications that do not impair the object and advantages thereof, and is not limited by the numerical values shown in the above embodiments.

Explanatory drawing which showed embodiment of the automatic valve apparatus by this invention Sectional drawing which showed embodiment of the automatic drain valve of FIG. Explanatory drawing of the operating state of the automatic drain valve of FIG. Explanatory drawing which showed other embodiment of the automatic drain valve by this invention Explanatory drawing showing a conventional automatic valve device Sectional view showing a conventional automatic drain valve

Explanation of symbols

10: Automatic valve body 12: Start valve 14: Automatic drain valve 16: Operation handle 18, 36, 60: Valve body 20, 38, 62: Inlet port 22, 40, 64: Outlet port 24: Secondary side pipe 25, 42: partition wall 26: open type sprinkler head 28: valve 30: cylinder chamber 32: piston 34: stem 35, 72: spring 44, 68: valve seat 45: cover 46: valve body 48: seal 50: first stem 52 : First spring 54: Second stem 56: Second spring 66: Ball valve element 70: Stem 74 and 76: Holder 78: Drain hole 80: Slide groove 82: Slide key 84: Shaft

Claims (8)

An automatic valve body that opens the valve by the operation of a piston by supplying pressurized water to the cylinder chamber;
An activation valve for supplying primary pressurized water to the cylinder chamber of the automatic valve body by an opening operation and stopping the supply of the pressurized water by a closing operation;
When the pressurized water on the secondary side of the automatic valve body and the pressurized water into the cylinder chamber are introduced, the valve is closed when the introduced pressurized water is equal to or higher than the specified pressure, and the valve is opened when the introduced pressurized water is lower than the specified pressure. An automatic drain valve to drain,
In an automatic valve device equipped with
The automatic drain device is provided with a manual opening mechanism for draining by forcibly opening the valve by manual operation in a state where the introduced pressurized water is closed at a pressure higher than a specified pressure.
2. The automatic valve device according to claim 1, wherein the automatic drain valve is
A valve body disposed so as to be openable and closable with respect to a valve seat separating the primary side and the secondary side in the valve body;
A first stem that connects one end to the valve body and slidably supports the other end relative to the valve body;
A first spring disposed on the first stem side and biasing the valve body in a closing direction;
The valve stem is slidably supported coaxially with the first stem and slidably supported on the valve body opposite the valve body, and has an operation handle on the outside. A second stem for forcibly moving the body to the open position;
A second spring disposed between the second stem and the valve body and biasing the valve body in an opening direction;
The valve body is held in an open position when the introduced pressurized water is less than a specified pressure, and the valve body is closed when the introduced pressurized water is greater than the specified pressure. An automatic valve device set to move to
2. The automatic valve device according to claim 1, wherein the automatic drain valve is
A ball valve body arranged to be openable and closable with respect to a valve seat separating the primary side and the secondary side in the valve body;
A stem disposed on the secondary side of the valve body, the ball valve body being in contact with the tip;
The stem is urged in the valve opening direction, the ball valve body is pushed up to the open position when the introduced pressurized water is less than the specified pressure, and the ball valve body is retracted to the closed position when the introduced pressurized water is above the specified pressure. Springs,
A drainage hole penetrating the ball valve body;
An operation handle for rotating the ball valve body to a closed position where the drain hole is removed from the valve seat and an open position where the drain hole is opposed to the valve seat;
An automatic valve device characterized by comprising:
4. The automatic valve device according to claim 3, wherein the automatic drain valve is
Forming a slide groove in a direction perpendicular to the drainage hole on the outer periphery of the ball body;
A slide key connected to the operation handle is fitted into the slide groove, and the ball valve body is closed by the operation handle via the slide key so that the drain hole is removed from the valve seat, and the drain hole is a valve. An automatic valve device that is rotated to an open position opposite to a seat.
In the automatic drain valve that closes the valve when the introduced pressurized water is above the specified pressure and opens the valve when the introduced pressurized water is less than the specified pressure to drain the introduced pressurized water,
An automatic drainage valve provided with a manual opening mechanism for forcibly opening and draining the valve by manual operation in a state where the introduced pressurized water is above a specified pressure and the valve is closed.
In the automatic drain valve of Claim 5,
A valve body disposed so as to be openable and closable with respect to a valve seat separating the primary side and the secondary side in the valve body;
A first stem that connects one end to the valve body and slidably supports the other end relative to the valve body;
A first spring disposed on the first stem side and biasing the valve body in a closing direction;
The valve stem is slidably supported coaxially with the first stem and is slidably supported by a valve body opposite to the valve body, and is provided with an operation handle on the outside. A second stem for forcibly moving the body to the open position;
A second spring disposed between the second stem and the valve body and biasing the valve body in an opening direction;
The valve body is held in an open position when the introduced pressurized water is less than a specified pressure, and the valve body is closed when the introduced pressurized water is greater than the specified pressure. Automatic drain valve, characterized in that it is set to move to
In the automatic drain valve of Claim 5,
A ball valve body arranged to be openable and closable with respect to a valve seat separating the primary side and the secondary side in the valve body;
A stem disposed on the secondary side of the valve body, the ball valve body being in contact with the tip;
The stem is urged in the valve opening direction, the ball valve body is pushed up to the open position when the introduced pressurized water is less than the specified pressure, and the ball valve body is retracted to the closed position when the introduced pressurized water is above the specified pressure. Springs,
A drainage hole penetrating the ball valve body;
An operation handle for rotating the ball valve body to a closed position where the drain hole is removed from the valve seat and an open position where the drain hole is opposed to the valve seat;
An automatic drain valve characterized by comprising:
In the automatic drain valve of Claim 7,
Forming a slide groove in a direction perpendicular to the drainage hole on the outer periphery of the ball body;
A slide key connected to the operation handle is fitted into the slide groove, and the ball valve body is closed by the operation handle via the slide key so that the drain hole is removed from the valve seat, and the drain hole is a valve. An automatic drain valve which is turned to an open position opposite to a seat.

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