JP5658213B2 - Shut-off valve - Google Patents

Description

  The present invention relates to a marine oil tank emergency shut-off valve that shuts off a fluid flow in a flow passage in an emergency.

  Conventionally, what is prescribed | regulated to the attached figure 1 of JISF7399: 2002 is generally used as a ship oil tank emergency cutoff valve. A cross-sectional view of this marine oil tank emergency shut-off valve (hereinafter “shut-off valve”) is shown in FIG. As shown in FIG. 6, this shut-off valve includes a valve box 110 in which a partition wall 111 is formed, a valve lid 120 that covers the opening of the valve box 110, and a valve lid 120 that passes through the valve in the vertical direction. A valve rod 130 that is movably supported, a spring 140 that urges the valve rod 130 downward in the vertical direction, and a lock pin 150 that locks the valve rod 130 are provided. Moreover, the distribution route of oil is shown with a dashed-dotted line.

As shown in FIG. 6, the partition wall 111 divides the oil flow path in the valve box 110 into an upstream side and a downstream side. The upstream side and the downstream side communicate with each other via the flow passage 113. The partition wall 111 is provided with a communication hole for forming the flow passage 113.
A valve seat 112 is provided in the communication hole of the partition wall 111, and a valve seat guide 115 is provided in the valve seat 112. Further, a valve body 114 is provided on the distal end side of the valve rod 130, and a valve body rod foot guide 116 is provided on the valve body 114.

According to such a shut-off valve, in an emergency, the lock pin 150 is released, the valve body 114 moves downward in the vertical direction by the biasing force of the spring 140, and the valve body 114 is seated on the valve seat 112. The path 113 is blocked.
The valve seat guide 115 and the valve body rod foot guide 116 guide the valve body 114 so that the valve body 114 is securely seated on the valve seat 112.

  By the way, when the valve body 114 is seated on the valve seat 112, the hydraulic pressure of the valve box 110 rapidly increases, and there is a possibility that oil flowing through the valve box 110 leaks from a gap between the valve lid 120 and the valve stem 130. is there. Therefore, in order to improve the liquid tightness between the valve lid 120 and the valve stem 130, a sealing packing 117 for sealing between the valve lid 120 and the valve stem 130 is disposed in the valve box 110, and a plurality of packings are provided. 118 is provided on the valve lid 120. As described above, since a plurality of packings are arranged, the conventional shut-off valve has been increased in size due to an increase in the number of packing arrangements.

  In addition, since such a conventional shut-off valve has a large number of packings, a large frictional force is generated between the valve stem 130 and the packing. Therefore, a strong spring 140 has been required. When the strong spring 140 is employed, there is a problem that the entire valve is further increased in size.

  Therefore, in Patent Document 1, a valve rod is accommodated in a cylinder, compressed gas is introduced into a pressurizing portion formed by the inside of the cylinder and the proximal end side of the valve rod, A shut-off valve used as a driving force for the rod to move downward in the vertical direction is disclosed.

Utility Model Registration No. 3130751

As described above, the shutoff valve described in Patent Document 1 drives the valve rod downward by the pressing force of the compressed air. Since the compressed air pressure acts on the valve stem when the valve stem is locked, it acts on the lock pin in the locked state via the valve stem.
By the way, the lock pin is disposed so as to move in a direction orthogonal to the moving direction of the valve stem. For this reason, the pressing force of the compressed air acts in a direction orthogonal to the moving direction of the lock pin. Therefore, the frictional force acting on the lock pin is increased, and there is a possibility that a problem that the lock pin cannot be released occurs in the lock mechanism.

  The present invention has been made to solve the above-described problems of the prior art, and it is an object of the present invention to provide a shut-off valve that is miniaturized while suppressing the occurrence of problems in the lock mechanism.

  A first aspect of the present invention includes a valve body provided with a flow part through which a fluid flows, a valve body capable of closing the flow part and blocking the flow of fluid in the flow part, and a vertical of the flow part A valve rod that supports the valve element, a lock mechanism that locks the valve rod and maintains the fluid in the circulation part, and a compressed gas. A pressurizing unit that presses the valve rod downward in the vertical direction, a gas supply unit that supplies compressed gas to the pressurizing unit, and a control unit that controls communication between the pressurizing unit and the gas supply unit The control unit shuts off the pressurizing unit and the gas supply unit when the valve rod is locked by the locking mechanism, and the valve rod is unlocked by the locking mechanism. Later, the pressurizing unit and the gas supply unit are connected. Characterized in that it.

  According to this configuration, the compressed gas starts to flow into the pressurizing unit after the lock mechanism is released. For this reason, the pressing force of the compressed gas that presses the valve stem downward in the vertical direction acts on the valve stem after the lock mechanism is released. Therefore, it is possible to suppress the occurrence of a problem that the friction force acting on the lock mechanism is increased by the pressing force of the compressed gas and the lock mechanism is not released. The “valve body” is configured by using a valve box and a valve lid described below.

  According to a second aspect of the present invention, there is provided a shutoff valve according to the first aspect, wherein the gas supply unit can open and close a portion through which the compressed gas flowing into the control unit flows when the lock mechanism is released. And an openable / closable discharge port that can discharge the compressed gas of the pressurizing unit when the open / close unit is in a state where the compressed gas flowing into the control unit is closed. It is provided.

  When the shut-off valve in the closed state is restored to the open state, it is necessary to bring the pressurizing part, which has been pressurized by the compressed gas, to normal pressure in order to return the valve stem to its original position. However, in the conventional shutoff valve, since the pressurizing part is in direct communication with the pipe and the tank, the gas pressure in the pipe and the tank has to be reduced at the same time when the pressurizing part is set to normal pressure. . When the gas pressure in the pipe or tank decreases, other equipment that uses the compressed gas may malfunction, or energy is required to increase the gas pressure in the pipe or tank again.

  In this regard, in the same configuration, when the shut-off valve is restored, the gas supply unit is first closed by the opening / closing unit, and then the discharge port is opened to discharge the compressed gas in the pressurizing unit, so that the pressurizing unit is set to normal pressure. be able to. As described above, in the gas supply unit, the pressurizing unit can be set to normal pressure in a state where the site where the compressed gas flowing into the control unit circulates, that is, the site where the control unit and the pipe communicate with each other is closed. When the shut-off valve is restored to the open state, it is possible to suppress a decrease in the gas pressure in the piping.

  In addition, “the portion through which the compressed gas flowing into the pressurizing portion through the control portion when the lock mechanism is released” means, in other words, the portion in which the pipe and the control portion communicate with each other in the gas supply portion. Indicates.

According to a third aspect of the present invention, there is provided a valve body having a partition wall that forms a flow part through which a fluid flows, a valve body capable of closing the flow part and blocking the flow of fluid in the flow part, A valve rod that is vertically movable above the flow portion and is movably arranged to support the valve body, and a lock mechanism that locks the valve rod and maintains the flow portion in a state in which fluid can flow. The valve body has a longitudinal width (size in the axial direction of the valve body) of 125 to 200% of a lateral width of the valve body (size in a direction perpendicular to the axial direction of the valve body). When the lock by the lock mechanism is released, the valve body provided on the valve rod closes the flow part by directly sitting on the partition wall.
More specifically, the third aspect of the present invention is a shutoff valve according to the first aspect or the second aspect, wherein the valve body has a longitudinal width of 125 to 200% of a lateral width of the valve body. When the lock by the lock mechanism is released, the valve body provided on the valve rod closes the flow part by directly seating on the partition wall.

  In the conventional valve body, the vertical width (size in the axial direction of the valve body) of the valve body is about 100 to 125% of the lateral width (size in the direction perpendicular to the axial direction of the valve body). Was formed. In a valve body including such a valve body, a guide portion that guides the movement of the valve body is provided in the partition wall in order to prevent the valve body from being tilted by the fluid pressure of the fluid flowing through the valve body (bias of the valve body). It was. However, such a guide portion may cause a turbulent flow and hinder smooth fluid flow.

  In this regard, in the same configuration, the vertical width of the valve body (size in the axial direction of the valve body) is 125 to 200% of the lateral width of the valve body (size in the direction perpendicular to the axial direction of the valve body). Is set to Thus, the valve body concerning the same structure is formed so that the ratio of the vertical width with respect to the horizontal width of the said valve body may become larger than the conventional valve body. For this reason, the ratio which the area of the valve body which contacts a valve stem occupies with respect to the whole valve body becomes larger than before. Therefore, the valve body is supported by the valve stem in a state in which the valve body is prevented from being tilted by the fluid pressure. For this reason, it can suppress that a valve body inclines with a fluid pressure, without providing a guide part etc. in a partition. Therefore, it is possible to suppress the smooth fluid flow in the flow part by providing the guide part and the like, and it is possible to reduce the size of the shut-off valve.

  According to a fourth aspect of the present invention, there is provided a shutoff valve according to any one of the first aspect to the third aspect, wherein the valve body is formed with a through-hole through which the valve rod passes, and the through-hole is formed in the through-hole. The first groove portion and the second groove portion are formed in the circumferential direction of the through hole, the first groove portion is provided with a sealing member, and the second groove portion is provided with an O-ring, The sealing member includes an inflow concave portion into which the fluid that has flowed into the first groove portion can flow, and a pair of sealing portions forming the inflow concave portion, and a semicircular shape (a semicircular cross section) on an outer periphery of the sealing portion. When the fluid does not flow into the inflow recess, only the convex portion of the sealing portion comes into contact with the valve stem, and when the fluid flows into the inflow recess, the sealing portion Are in close contact with the through hole and the valve stem, respectively. Characterized by sealing the gap between.

  Conventionally, in order to improve the liquid tightness between the valve body and the valve stem, a plurality of packings have been provided between the valve body and the valve stem. However, when a plurality of packings are arranged between the valve body and the valve stem in this way, the valve stem becomes difficult to move due to the strong frictional force generated between the valve stem and the packing, and the valve is closed. There was a risk that the transition to the state would be hindered.

  In this regard, according to the sealing member having the same configuration, when the fluid is not flowing into the inflow concave portion, only the semicircular convex portion is in contact with the valve rod. It is possible to suppress the generation of a strong frictional force during the period. In addition, after the shut-off valve has moved to the closed state, that is, when a high pressure is generated in the valve body due to the inflowing fluid and the fluid enters the first groove through the gap between the valve body and the valve stem, the fluid is First, it flows into the inflow recess. When the fluid flows into the inflow recess as described above, the sealing portion comes into close contact with the through hole and the valve rod, and the intruded fluid can be prevented from further entering the upper portion. Therefore, according to the configuration, it is possible to achieve both improvement of liquid tightness and suppression of generation of strong frictional force between the sealing member and the valve stem.

  Moreover, in the same structure, since the liquid tightness between a valve main body and a valve stem can be improved by using a sealing member, it is not necessary to use a plurality of packings. Therefore, the shut-off valve can be reduced in size.

  According to a fifth aspect of the present invention, there is provided a shutoff valve according to any one of the first to fourth aspects, wherein the valve body is provided with a specific blade, and the valve body includes the fluid received by the specific blade. It is provided in the said valve rod so that it can rotate by a fluid pressure.

  According to this configuration, the rotation of the valve body can alleviate the change in the fluid pressure in the valve body and suppress the occurrence of cavitation and pulsation. Moreover, even if it is a case where the fluid flow pressure is high, it can suppress that a valve body inclines by a fluid pressure by rotating.

  According to the present invention, it is possible to provide a shut-off valve that is downsized while suppressing the occurrence of problems in the lock mechanism.

1 is a schematic configuration diagram of a marine fuel oil and compressed gas supply system including a shutoff valve according to an embodiment of the present invention. The partially cutaway sectional view showing the valve opening state of the shutoff valve according to the same embodiment. The schematic diagram which shows the valve body concerning the embodiment. (A) And (b) is a schematic block diagram of the packing concerning the embodiment. The partially cutaway sectional view showing the closed state of the shutoff valve according to the same embodiment. Sectional drawing which shows the valve opening state of the conventional cutoff valve.

  1 to 5 show an embodiment in which the present invention is embodied in a marine oil tank emergency shut-off valve (hereinafter referred to as "shut-off valve") 1 provided between a fuel oil storage unit and an engine of a ship. While explaining. First, a schematic configuration of a ship fuel oil and compressed gas supply system according to an embodiment of the present invention will be described with reference to FIG.

  As shown in FIG. 1, a shut-off valve 1 that shuts off the flow of fuel oil in an emergency is disposed between a fuel storage unit 2 that stores ship fuel oil and an engine 3. The shut-off valve 1 in this embodiment is operated by compressed gas. This compressed gas is stored in the tank 4 that temporarily stores the compressed gas supplied from the compressor P. In addition, the tank 4 is normally maintained at 0.98 Mpa.

The shut-off valve 1 communicates with the tank 4 via a pipe 80. In the pipe 80, there is a control chamber 5 for controlling the communication state between the tank 4 and various devices (indicated as No. 1 to No. 9 in FIG. 1) using electronic techniques. Is provided.
In this embodiment, the tank 4 and the shutoff valve 1 are shut off during normal times. In an emergency, the operator causes the tank 4 and the shutoff valve 1 to communicate with each other under the control of the control room 5 to supply the shutoff valve 1 with the compressed gas stored in the tank 4, Shut off the distribution of fuel oil.

  Next, a schematic configuration of the shutoff valve 1 according to an embodiment of the present invention will be described with reference to FIG. As shown in FIG. 2, the shutoff valve 1 according to the present embodiment includes a valve box 10, a valve rod 40 that can move up and down in the vertical direction, a valve body 30 disposed on the valve rod 40, and a valve rod 40. Compressed air is supplied to a locking mechanism 50 that locks, a first cylinder 20 that houses a part of the valve stem 40, and a pressurizing chamber 24 (corresponding to a “pressurizing portion” of the present invention) formed in the first cylinder 20. A gas supply path 60 (corresponding to the “gas supply unit” of the present invention) is included. Hereinafter, each configuration will be described in detail.

  The valve box 10 has an opening 17 at the top, and marine fuel oil (corresponding to “fluid” of the present invention, hereinafter “oil”) circulates inside. The opening 17 is covered with a valve lid 11 in which a through hole 19 is formed in the central portion. A flange 18 is formed in the valve box 10 so as to surround the outer periphery of the opening 17. The valve lid 11 is bolted to the flange 18.

  A partition wall 12 is formed inside the valve box 10 to divide the oil flow path into an upstream side and a downstream side, and the partition 12 communicates with the upstream side and the downstream side of the oil flow path. A path 13 (corresponding to the “distribution section” of the present invention) is formed. As indicated by a one-dot chain line in FIG. 2, the oil that has flowed into the valve box 10 flows through the upstream side, the flow path 13, and the downstream side in this order, and is supplied to the engine 3.

  A groove 81 is formed on the inner peripheral surface of the opening 17 in the circumferential direction. An O-ring 15 is provided in the groove 81 to improve liquid tightness with the valve lid 11. Further, a gasket sheet 16 for increasing liquid tightness is disposed between the flange 18 and the valve lid 11. The gasket sheet 16 is disposed over the entire circumference of the flange 18.

  A valve body 30 is provided above the flow passage 13 in the vertical direction. In an emergency, the valve body 30 moves downward in the vertical direction, closes the flow passage 13, and blocks the oil flow in the flow passage 13. Hereinafter, a state where the shut-off valve 1 is operated, that is, a state where the valve body 30 is in a position where the flow passage 13 is closed is referred to as a “valve closed state”, and a state where the shut-off valve 1 is not actuated, ie, the valve body 30. Is in a position away from the flow passage 13 is referred to as a “valve open state”.

  When the valve is closed, the lower end of the valve body 30 contacts a part of the partition wall 12. A buffer sheet 14 is affixed to a portion of the partition wall 12 that contacts the valve body 30 when the valve is in a closed state. In the valve body 30, a buffer sheet 34 is attached to a portion that contacts the partition wall 12 when the valve body 30 is in the closed state.

  The valve body 30 has a vertical width of the valve body 30 (a size of the valve body 30 in the axial direction, a size of the valve body vertical width 30b shown in FIG. 2). The size in the direction perpendicular to the direction, the size of the lateral width 30a shown in FIG. 2) is preferably in the range of 125 to 200%, more preferably in the range of 150 to 200%, and more preferably 165 to 200. More preferably, it is in the range of%. The valve body 30 is formed of a metal member such as stainless steel (SUS).

The valve body 30 is provided on the distal end side of the valve rod 40. Hereinafter, the lower end side of the valve stem 40 is referred to as a distal end side, and the upper end side is referred to as a proximal end side.
The valve body 30 is provided on the valve stem 40 via a ball bearing 32. That is, the valve body 30 is supported by the valve stem 40 so as to be rotatable about the axis of the valve stem 40 as a rotation axis.

  Next, the guide blade 31 will be described with reference to FIG. 3 showing a schematic diagram of the valve body 30. As shown in FIG. 3, a guide blade 31 is formed on the side surface of the valve body 30. The valve body 30 is formed with a pair of guide vanes 31 inclined at a predetermined angle θ with respect to the axial direction of the valve body 30. The predetermined angle θ is preferably in the range of 30 ° to 60 °, and more preferably in the range of 45 ° to 60 °.

  When the guide vane 31 receives the fluid pressure of the oil flowing through the valve box 10, the valve body 30 rotates. As the valve body 30 rotates, fluctuations in the fluid pressure in the valve box 10 are alleviated, and the occurrence of pulsation and cavitation is suppressed. In addition, the rotation of the valve body 30 prevents the valve rod 40 from being biased by the fluid pressure of the oil. Further, the oil can be guided to the flow passage 13 by the rotation of the valve body 30.

Next, the configuration of the valve stem 40 will be described in detail with reference to FIG.
A buffer member 33 is provided on the distal end side of the valve stem 40. The buffer member 33 is formed of a hard metal member such as SKD or SNCM, which is a high hardness hardened steel.
The front end side of the buffer member 33 is formed in a flat surface shape. Thus, since the front end side is formed in a flat surface shape, the buffer member 33 and the valve body 30 are in surface contact. When shifting to the valve-closed state, the buffer member 33 and the valve body 30 are in surface contact with each other, so that the stress generated in the valve body 30 due to the collision with the buffer member 33 can be dispersed.

  Further, as described above, the valve body 30 is formed of a metal member such as stainless steel (SUS), while the buffer member 33 is formed of a hard metal member such as SKD or SNCM. Thus, since the valve body 30 and the buffer member 33 are formed of different materials, the occurrence of seizure between metals is suppressed. That is, when the material of the valve body 30 and the buffer member 33 are the same, there is a risk that intermetallic seizure occurs between the valve body 30 and the buffer member 33. In this regard, according to the present embodiment, since the valve body 30 and the buffer member 33 are formed of different materials, the occurrence of seizure between metals is suppressed. The hardness difference between the stainless steel forming the valve body 30 and the hard metal member forming the buffer member 33 is preferably 50 or more.

The valve stem 40 penetrates the valve lid 11 through the through hole 19.
On the inner peripheral surface of the through hole 19 of the valve lid 11, grooves 82 and 83 (the groove 82 corresponds to the “second groove” of the present invention, and the groove 83 corresponds to the “first groove” of the present invention over the circumferential direction). ) Is formed. The O-ring 46 is disposed in the groove portion 82, and the packing 42 (corresponding to the “sealing member” of the present invention) is disposed in the groove portion 83. Both are arranged to improve the liquid tightness between the valve lid 11 and the valve stem 40. In addition to the packing 42, a packing presser 41 that presses the packing 42 against the valve lid 11 is disposed in the groove 83.

  When the shut-off valve 1 shifts to the closed state, the oil pressure in the valve box 10 rapidly increases due to the oil flowing in, and the oil in the valve box 10 may leak to the outside through the gap between the valve rod 40 and the valve lid 11. Therefore, in this embodiment, as described above, the O-ring 46 and the packing 42 are provided in order to improve the liquid tightness between the valve stem 40 and the valve lid 11.

The packing 42 will be described in detail with reference to FIGS. 4 (a) and 4 (b).
FIG. 4A shows a schematic diagram of the packing 42 in the valve open state, and FIG. 4B shows a transition to the valve closed state and the hydraulic pressure of the valve box 10 rises. The schematic diagram of the packing 42 when oil penetrates into the gap between the valve lid 11 and the valve lid 11 is shown. As shown in FIGS. 4 (a) and 4 (b), the packing 42 includes a pair of gaps 42a (corresponding to “inflow recesses” of the present invention) into which oil can flow and semicircular protrusions 43b. The sealing part 43 is comprised.

  As shown in FIG. 4A, when the packing 42 is in a valve open state, that is, when oil is not flowing into the gap 42a, only the convex portion 43b is in contact with the valve rod 40. For this reason, when the shut-off valve 1 shifts from the open state to the closed state, generation of a large frictional force between the valve rod 40 and the packing 42 can be suppressed.

  On the other hand, as shown by the arrow A in FIG. 4 (b), when the shutoff valve 1 shifts to the closed state and oil enters from the gap between the valve stem 40 and the valve lid 11, It flows into the gap 42a. The packing 42 is pressed upward from the gap 42a by the oil flowing into the gap 42a. As described above, since the packing 42 is pressed against the valve lid 11 by the packing presser 41, when it is pressed upward from the gap 42a, it expands as shown in FIG. 4B. Thereby, a pair of sealing part 43 closely_contact | adheres to the valve stem 40 and the valve lid 11, respectively. That is, the contact area between the sealing portion 43 and the valve stem 40 and the contact area between the sealing portion 43 and the valve lid 11 are increased. Thereby, the packing 42 seals the gap between the valve stem 40 and the valve lid 11, and the oil can be prevented from further rising through the groove 83.

Next, the shutoff valve 1 will be further described with reference to FIG.
A strut 73 is bolted to the valve lid 11.
A first cylinder 20 is bolted to the column 73, and an opening / closing support 44 having one end fixed to the valve rod 40 is attached to the column 73 so that the column 73 can be moved up and down. The opening / closing support device 44 moves the column 73 up and down as the valve rod 40 moves up and down. The column 73 is provided with valve rod position indications 73a and 73b indicating whether the shut-off valve 1 is in an open state or a closed state. When the opening / closing support 44 is positioned on the valve stem position display 73a, the shut-off valve 1 is in the open state, while when the opening / closing support 44 is positioned on the valve stem position display 73b, the shut-off valve 1 is open. Is closed.

  A handle transmission shaft 70 that is rotatable relative to the valve stem 40 is provided on the base end side of the valve stem 40. A handle wheel 71 that rotates integrally with the handle transmission shaft 70 is provided at one end of the handle transmission shaft 70.

A first piston 21 is accommodated in the first cylinder 20 so as to be movable in the vertical direction. The valve stem 40 and the handle transmission shaft 70 are screwed to the first piston 21.
That is, a female thread is formed on the inner wall of the first piston 21, and a male thread is formed on the outer peripheral surface of the valve stem 40 and the outer peripheral surface of the handle transmission shaft 70. When the handle wheel 71 rotates clockwise, the valve rod 40 moves downward with respect to the first piston 21, while the handle transmission shaft 70 moves upward with respect to the first piston 21. When the handle wheel 71 is rotated counterclockwise, the valve rod 40 moves upward with respect to the first piston 21, while the handle transmission shaft 70 moves downward with respect to the first piston 21.

A pressurizing chamber 24 is formed in the first cylinder 20 by the inner wall of the first cylinder 20 and one surface of the first piston 21. The pressurizing chamber 24 is provided with a first elastic member 22 that urges the first piston 21 downward in the vertical direction.
A lock groove 23 is formed on the outer peripheral surface of the first piston 21 in the circumferential direction. The lock groove 23 constitutes a part of the lock mechanism 50 described in detail below.

Next, the lock mechanism 50 will be described in detail.
The lock mechanism 50 includes the lock groove 23 described above, a lock pin 51 that can be inserted into the lock groove 23, a second cylinder 53 that is provided on the outer surface of the first cylinder 20 and accommodates at least a part of the lock pin 51, and a valve stem The second elastic member 52 that urges the lock pin 51 in the direction of locking 40 is configured.

  The lock pin 51 is disposed substantially horizontally so that it can be inserted into the lock groove 23. In the lock mechanism 50, the lock pin 51 is pressed against the lock groove 23 by the urging force of the second elastic member 52, thereby locking the valve rod 40 and maintaining the valve open state.

  A gas supply path 60 is formed in the second cylinder 53. The gas supply path 60 communicates with the pipe 80. The gas supply path 60 communicates with a communication section 61 (corresponding to a “control section” of the present invention) that controls the communication state between the gas supply path 60 and the pressurizing chamber 24. When the valve rod 40 is locked by the lock pin 51, that is, when the shut-off valve 1 is in an open state, the communication portion 61 shuts off the gas supply path 60 and the pressurizing chamber 24. On the other hand, when the lock of the valve rod 40 is released, that is, when the shutoff valve 1 is in the closed state, the communication portion 61 allows the gas supply path 60 and the pressurizing chamber 24 to communicate with each other.

In addition, an open / close valve 63 (corresponding to the “opening / closing part” of the present invention) that can open and close the gas supply path 60 is provided between the pipe 80 and the communication part 61, in other words, supplied from the pipe 80. The compressed gas is provided at a site that flows when the compressed gas flows into the communication portion 61 (corresponding to “a site at which the compressed gas flowing into the control unit flows” in the present invention).
Further, in the gas supply path 60, an openable / closable discharge valve 62 (corresponding to the “discharge port” of the present invention) that can discharge the compressed gas in the pressurizing chamber 24 when the open / close valve 63 is closed. ) Is provided. In the present embodiment, the discharge valve 62 is configured as a check valve.

Next, the operation of the shutoff valve 1 and the communication state between the gas supply path 60 and the pressurizing chamber 24 will be described in detail with reference to FIGS. 2 and 5. In addition, in FIG. 5, the partially cutaway sectional view of the shutoff valve 1 when it shifts to the valve closing state is shown.
As shown in FIG. 2, the lock pin 51 is pressed against the lock groove 23 by receiving the urging force of the second elastic member 52 in the normal state, that is, when the valve is open. Further, the discharge valve 62 is closed and the on-off valve 63 is opened.

  In an emergency, the tank 4 and the shut-off valve 1 are made to communicate with each other by operating the control chamber 5 by an operator. At this time, since the on-off valve 63 is in the open state, the compressed gas is supplied to the gas supply path 60 through the pipe 80. When the pressure of the compressed gas supplied to the gas supply path 60 exceeds the urging force of the second elastic member 52, the lock pin 51 is pressed in a direction to be released from the lock groove 23.

  When the lock pin 51 is released from the lock groove 23, the valve rod 40 moves downward in the vertical direction by the urging force and the own weight of the first elastic member 22, as shown in FIG. 5. And the valve body 30 obstruct | occludes the flow path 13 (the cutoff valve 1 transfers to a valve closing state), and the distribution | circulation of the oil in the valve box 10 is interrupted | blocked.

  As described above, when the shut-off valve 1 shifts to the closed state, the pressurizing chamber 24 and the gas supply path 60 are communicated with each other through the communicating portion 61 as shown in FIG. Thereby, the compressed gas of the gas supply path 60 flows into the pressurizing chamber 24, and the first piston 21 is pressed downward in the vertical direction. That is, the valve body 30 is pressed against the partition wall 12. Thereby, the distribution | circulation of the oil in the valve box 10 can be interrupted | blocked more suitably.

  By the way, when the shut-off valve 1 shifts to the closed state, the oil pressure flowing into the valve box 10 rapidly increases the hydraulic pressure of the valve box 10, and the gap between the valve box 10 and the valve lid 11, and the valve lid 11 and the valve rod. There is a risk of oil leaking from the gap with 40. In this respect, according to the present embodiment, the O-ring 15 and the gasket sheet 16 are provided between the flange 18 of the valve box 10 and the valve lid 11. Oil can be prevented from leaking out.

Further, since the O-ring 46 and the packing 42 are provided between the valve lid 11 and the valve stem 40, as described above, oil leakage from between the valve lid 11 and the valve stem 40 is suppressed. can do.
By the way, when the packing 42 is brought into close contact with the valve stem 40, the liquid tightness can be improved, but when the valve stem 40 moves in an emergency, a frictional force is generated between the packing 42 and the valve stem 40, There is a possibility that the downward movement of the valve stem 40 in the vertical direction is suppressed. However, according to the present embodiment, as described above, when the shutoff valve 1 is in the valve open state, the packing 42 is formed so that the contact area between the packing 42 and the valve stem 40 is reduced. Generation of friction between the packing 42 and the valve stem 40 can be suppressed.

Next, a procedure for restoring the shutoff valve 1 to the open state will be described.
First, the operator closes the on-off valve 63 and shuts off the pipe 80 and the gas supply path 60, then opens the discharge valve 62, and discharges the compressed gas in the gas supply path 60 and the pressurizing chamber 24. Eject from 62. Thereby, the gas supply path 60 and the pressurizing chamber 24 become normal pressure.

  Next, the operator rotates the handle wheel 71 in the clockwise direction. As a result, the first piston 21 and the handle transmission shaft 70 rise while leaving the valve rod 40. When the first piston 21 rises to a predetermined position, the lock pin 51 is inserted into the lock groove 23 by the urging force of the second elastic member 52. Thereby, the vertical position of the first piston 21 is fixed.

When the lock pin 51 is inserted into the lock groove 23, the operator rotates the handle wheel 71 in the counterclockwise direction. Thereby, the valve stem 40 rises. At this time, since the first piston 21 is locked by the lock pin 51, its position does not move. The operator rotates the handle wheel 71 in the counterclockwise direction until the opening / closing indicator 44 is positioned on the valve rod position display 73a.
Thereafter, the operator closes the discharge valve 62 and opens the on-off valve 63.

According to this embodiment described above, the following operational effects can be achieved.
(1) In the present embodiment, the compressed gas begins to flow into the pressurizing chamber 24 after the lock pin 51 is released from the lock groove 23. For this reason, the pressing force of the compressed gas that presses the valve rod 40 downward in the vertical direction acts after the lock pin 51 is released. Accordingly, it is possible to prevent the lock pin 51 from being released from the lock groove 23 due to friction acting on the lock pin 51.

  (2) Since the valve body 30 is pressed against the partition wall 12 by the compressed gas supplied to the pressurizing chamber 24 after the valve body 30 is seated on the partition wall 12, the flow passage 13 can be preferably blocked. it can.

  (3) In addition, in the conventional shut-off valve 1 described in Patent Document 1 and the like, not only the inside of the shut-off valve 1 but also the piping is used to restore the inside of the shut-off valve 1 to normal pressure when the valve is restored to the open state. 80 and tank 4 gas pressure had to be reduced. As described above, when the gas pressure in the pipe 80 and the tank 4 decreases, other devices that use the compressed gas are adversely affected, and energy is consumed to increase the gas pressure in the pipe 80 and the tank 4 again. . In this respect, in the present embodiment, since the discharge valve 62 and the on-off valve 63 are provided in the gas supply path 60, the discharge valve 62 is opened while the piping 80 and the gas supply path 60 are shut off from the pressurizing chamber 24. Compressed gas can be discharged. For this reason, the pressurization chamber 24 can be made into a normal pressure, without reducing the gas pressure of the piping 80 and the tank 4. FIG.

  (4) Since the valve body 30 is configured to be directly seated on the partition wall 12, it is not necessary to provide a guide portion or the like on the partition wall 12. For this reason, oil can be smoothly circulated in the valve box 10. Furthermore, the valve box 10 can be downsized.

  (5) Conventionally, a sealing packing 117 and a plurality of packings 118 have been interposed between the valve lid 11 and the valve stem 40 in order to improve the liquid tightness between the valve lid 11 and the valve stem 40. (See FIG. 6). However, when the sealing packing 117 and the plurality of packings 118 are interposed between the valve lid 11 and the valve stem 40 as described above, the valve stem is caused by a strong frictional force generated between the valve stem 40 and the packing. 40 becomes difficult to move, and there is a possibility that the transition to the valve-closed state is hindered. In this regard, according to the present embodiment, during normal operation, that is, when oil does not flow into the gap 42 a, only the convex portion 43 b is in contact with the valve stem 40. Generation | occurrence | production of a strong frictional force can be suppressed. Further, when the oil enters the gap between the valve lid 11 and the valve stem 40 after the shut-off valve 1 shifts to the closed state, the oil first flows into the gap 42a. When the oil flows into the gap 42a in this way, the sealing portion 43 comes into close contact with the valve lid 11 and the valve rod 40, and the intruding oil can be prevented from further entering the upper portion. Therefore, it is possible to achieve both improvement of liquid tightness and suppression of generation of strong frictional force between the packing 42 and the valve stem 40.

  (6) Since the highly liquid-tight packing 42 is used, it is not necessary to provide the sealing packing 117 or the plurality of packings 118 between the valve lid 11 and the valve stem 40. Therefore, the shut-off valve 1 can be reduced in size.

  (7) Since it is not necessary to provide a plurality of packings as in the prior art, the valve lid 11 can be downsized, and the valve body vertical width 30b can be increased accordingly. Therefore, the proportion of the contact area between the valve body 30 and the valve rod 40 with respect to the entire valve body 30 can be increased, and deviation of the valve body 30 can be suitably suppressed.

  (8) Moreover, since the valve body 30 is rotatably supported, the change of the fluid pressure in the valve box 10 can be relieved and the occurrence of cavitation and pulsation can be suppressed. Furthermore, even if the fluid pressure is high, the displacement of the valve body 30 can be suppressed.

  (9) Since the first elastic member 22 urges the valve rod 40 downward in the vertical direction, the shutoff valve 1 can be promptly shifted to the closed state in an emergency. Further, when the shut-off valve 1 is in the closed state, the urging force of the first elastic member 22 presses the valve body 30 against the partition wall 12, so that the oil flow in the valve box 10 can be suitably shut off.

  (10) The first elastic member 22 is accommodated in the first cylinder 20. For this reason, it can suppress that dust and oil stains adhere to the first elastic member 22. Moreover, when the shut-off valve 1 operates, the generation of noise due to the first elastic member 22 can be suppressed. Further, when the first elastic member 22 is exposed to the outside, there is a possibility that an operator may accidentally touch it, but according to the present embodiment, the first elastic member 22 is accommodated in the first cylinder 20. Therefore, it can suppress that an operator touches accidentally.

  (11) Moreover, since the valve body 30 and the buffer member 33 are formed from different materials, it is possible to suppress the occurrence of intermetallic seizure between them.

  (12) Since the gasket sheet 16 and the O-ring 15 are disposed between the flange 18 and the valve lid 11, the liquid tightness between the valve box 10 and the valve lid 11 is improved. The outer diameter of the flange 18 can be made smaller and smaller than before.

(Other embodiments)
The shut-off valve 1 according to the present invention is not limited to the configuration exemplified in the above embodiment, and can be implemented as, for example, the following form in which the embodiment is appropriately changed. The following modifications are not applied only to the above-described embodiment, and different modifications can be combined with each other.

  In the above embodiment, the gas supply path 60 and the pressurizing chamber 24 are not communicated until the valve body 30 is in the closed state, but the present invention is not limited to this. For example, like the communication part 61a shown by a two-dot chain line in FIG. 2, after the lock pin 51 is released and the piston 21 starts to move downward in the vertical direction, before the valve body 30 is closed, You may provide in the position which connects the gas supply path 60 and the pressurization chamber 24. FIG. According to the present invention, the first piston 21 can be quickly moved downward in the vertical direction by the pressing force of the compressed gas supplied to the pressurizing chamber 24 after the lock pin 51 is released.

  In the embodiment and the modified example, the communication portion 61 controls the communication state between the pressurizing chamber 24 and the gas supply path 60, but the present invention is not limited to this. For example, an open / close valve that can be manually opened and closed by an operator may be provided between the pressurizing chamber 24 and the gas supply path 60.

  In the above embodiment, the guide blade 31 is formed on the valve body 30, but the present invention is not limited to this, and the guide blade 31 may be omitted from the valve body 30. Also in this modification, the said effect (1)-(7), (9), (10) can be show | played.

  In the above embodiment, the valve body width 30a is set to 125 to 200% of the valve body vertical width 30b, and the valve body 30 is directly seated on the partition wall 12, but the present invention is limited to this. It is not a thing. The aspect ratio of the valve body 30 may be set to a value similar to that of the conventional valve body, and the valve seat 112 and the valve seat guide 115 may be provided in the partition wall 111 as in the conventional case. Also in this modification, the said effect (1)-(3), (5), (6), (8)-(10) can be show | played.

  In the above embodiment, the first elastic member 22 is accommodated in the first cylinder 20, but the present invention is not limited to this, and the first elastic member 22 may be exposed to the outside. Also in this modification, the said effect (1)-(8), (10) can be show | played.

  In the above embodiment, the first elastic member 22 is provided in the first cylinder 20, but the present invention is not limited to this, and the first elastic member 22 may be omitted. According to this modification, the shut-off valve 1 can be further downsized. Even if the first elastic member 22 is omitted in this way, since the frictional force generated between the packing 42 and the valve stem 40 is small, when the lock pin 51 is released, the shut-off valve 1 It is possible to shift to the valve-closed state with a weight of 40.

  In the above embodiment, the packing 42 is used. However, the present invention is not limited to this, and a plurality of packings may be provided as in the conventional case. In this case, it is desirable to dispose the first elastic member 22 on the first piston 21 without omitting it.

  In the above embodiment, the shutoff valve 1 that shuts off the flow of fuel oil has been described. However, the present invention is not limited to this, and for example, a shutoff valve for shutting off the flow of lubricating oil or other fluids You may apply to.

  In the above embodiment, the discharge port is configured as the discharge valve 62 and the opening / closing portion is configured as the opening / closing valve 63. However, the discharge port and the opening / closing portion in the present invention are not limited to valves, and can be opened and closed. Anything is acceptable.

DESCRIPTION OF SYMBOLS 1 ... Shut-off valve 2 ... Fuel storage part 3 ... Engine 4 ... Tank 5 ... Control room 10 ... Valve box 11 ... Valve cover 12 ... Bulkhead 13 ... Flow path 14 ... Buffer sheet 15 ... O-ring 16 ... Gasket sheet 17 ... Opening part DESCRIPTION OF SYMBOLS 18 ... Flange 19 ... Through-hole 20 ... 1st cylinder 21 ... 1st piston 22 ... 1st elastic member 23 ... Locking groove 24 ... Pressurizing chamber 30 ... Valve body 31 ... Guide blade 32 ... Ball bearing 33 ... Buffer member 34 ... Buffer sheet 40 ... Valve rod 41 ... Packing retainer 42 ... Packing 43 ... Sealing portion 44 ... Opening / closing support device 43b ... Protruding portion 46 ... O-ring 50 ... Lock mechanism 51 ... Lock pin 52 ... Second elastic member 53 ... Second cylinder 60 ... Gas supply path 61 ... Communication part 62 ... Drain valve 63 ... On-off valve 70 ... Handle transmission shaft 71 ... Handle wheel 73 ... Strut 73a ... Valve stem position display 73b ... Valve Position display 80 ... Piping 81 ... Groove part 82 ... Groove part 83 ... Groove part 110 ... Valve box 111 ... Bulk wall 112 ... Valve seat 113 ... Flow passage 114 ... Valve element 115 ... Valve seat guide 116 ... Valve body rod foot guide 117 ... Sealing packing 118 ... Packing 120 ... Valve lid 130 ... Valve rod 140 ... Spring 150 ... Lock pin

Claims (5)

A valve body provided with a flow part through which fluid flows, a valve body that closes the flow part and blocks the flow of fluid in the flow part, and can be moved vertically above the flow part in the vertical direction A valve stem that supports the valve body, a lock mechanism that locks the valve stem so that fluid can flow through the flow portion, and a vertical direction of the valve rod using compressed gas. A pressurization unit that presses downward, a gas supply unit that supplies compressed gas to the pressurization unit, and a control unit that controls a communication state between the pressurization unit and the gas supply unit,
The control unit shuts off the pressurizing unit and the gas supply unit when the valve rod is locked by the locking mechanism, and after the unlocking of the valve rod by the locking mechanism, A shut-off valve, wherein the pressure part and the gas supply part are communicated. The shut-off valve according to claim 1,
The gas supply section includes an opening / closing section capable of opening and closing a portion through which the compressed gas flowing into the control section flows when the locking mechanism is released, and a flow of the compressed gas from which the opening / closing section flows into the control section. A shut-off valve characterized in that an openable and closable discharge port is provided that can discharge the compressed gas of the pressurizing part when the part to be closed is in a closed state. The shut-off valve according to claim 1 or 2,
The valve body has a longitudinal width of 125 to 200% of a lateral width of the valve body,
The shutoff valve, wherein when the lock by the lock mechanism is released, the valve body provided on the valve rod closes the flow part by directly sitting on the partition wall. The shut-off valve according to any one of claims 1 to 3,
The valve body is formed with a through-hole through which the valve stem passes,
In the through hole, a first groove portion and a second groove portion are formed in the circumferential direction of the through hole,
The first groove part is provided with a sealing member, and the second groove part is provided with an O-ring,
The sealing member includes an inflow concave portion into which the fluid flowing into the first groove portion can flow and a pair of sealing portions forming the inflow concave portion, and a semicircular convex portion is provided on an outer periphery of the sealing portion. And
When no fluid flows into the inflow recess, only the convex portion of the sealing portion comes into contact with the valve rod, while when the fluid flows into the inflow recess, the sealing portion becomes the through-hole and the valve rod. A shut-off valve characterized in that the gap between the through hole and the valve stem is sealed in close contact with each other. The shut-off valve according to any one of claims 1 to 4,
The valve body is provided with a specific wing,
The said valve body is provided in the said valve rod so that it can rotate with the fluid pressure of the said fluid which the said specific blade receives. The cutoff valve characterized by the above-mentioned.

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