JP2016151308A - On-off valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cause an on-off valve to be easily opened by manual handling when the on-off valve having a piston and a valve body smoothly operated is kept under its normal-closed state.SOLUTION: One end of each of shafts 30, 58 is connected to a valve body 24 that can be sat on and moved away from a valve seat 22 in the middle of flow passages 14, 18 and the other end is protruded from a main body 2. A piston 54 arranged in a piston chamber 50 in the main body 2 is inserted into the shafts 30, 58 and engaged with them. Air is fed to or discharged out of a feeding or discharging port 62 to or from the piston chamber 50 so as to slide the piston 54 in an upward or downward direction. Protruded portion of each of the shafts 30, 58 from the main body 2 is provided with an indicator flange 68, an operation bolt 70 is outwardly inserted to the shafts 30, 58, engaged in thread with the main body 2 to cause a part of it to be protruded out of the main body 2 and it is advanced or retracted in upward or downward direction in response to the thread engaged state. Under the seated state, motion of the operation bolt 70 in its upward direction causes a head part 70a of the operation bolt 70 to be contacted with the lower surface of the indicator flange 66 and the valve body 24 is moved away from the valve seat 22.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an on-off valve and is attached to, for example, a container that accommodates a high-pressure fluid.

  An example of the on-off valve as described above is disclosed in Patent Document 1. In the technique of Patent Document 1, two flow paths that form a right angle in the housing are formed so as to intersect each other. One of the openings to the outside world is used as a gas inlet, and the other opening to the outside world is used as a gas outlet. A valve seat is formed at the intersection of the two flow paths. A valve body that opens and closes the valve seat is disposed in the vicinity of the valve seat, one end of a shaft disposed on the extension line of one flow path is coupled to the valve body, and a piston is coupled to the other end of the shaft. . The piston has a surface close to the valve body and a surface far from the valve body, and a spring disposed on the far surface presses the piston, causing the valve body to close the valve seat. When driving fluid is supplied from the outside to the surface of the piston close to the valve body, the piston moves the valve body to the spring side against the pressing force of the spring to open the valve seat. A protrusion is formed so as to be further from the valve body from the center of the surface far from the valve body of the piston, and a jig insertion screw hole through which a jig can be inserted from the outside of the housing is formed at the tip of the protrusion. ing. When forcibly opening the valve, the jig is inserted into and screwed into the jig insertion screw hole, and the piston is pushed up against the pressing force of the spring by the jig, and the valve body is separated from the valve seat.

Japanese Patent Laid-Open No. 2007-12763

  In the above technique, when the valve is forcibly opened, the jig must be operated after attaching the jig to the piston, which is troublesome. In addition, since the other end of the shaft to which the valve body is coupled to one end is coupled to the piston, the above-mentioned shaft is arranged on the central axis after matching the central axes of the piston and the valve body. Otherwise, the piston and the valve body did not operate smoothly, and it was necessary to improve the assembly accuracy between the piston and the valve body.

  It is an object of the present invention to provide an on-off valve that can be easily opened manually, and that both operate smoothly without increasing the assembly accuracy of a piston and a valve body.

  The on-off valve of one embodiment of the present invention has a main body. The main body is provided with an inflow port and an outflow port for the fluid that are open to the outside world. For example, the inflow port is coupled to a container that contains a fluid, and the outflow port is coupled to another container through a pipe. As the fluid, liquid or gas can be used. A flow path is formed in the main body by connecting the inlet and the outlet. The flow path can be formed linearly, or can be formed by intersecting two flow paths having a predetermined angle at one place. A valve seat is provided in the middle of the flow path. A valve body is provided in the main body so as to be able to be seated and separated from the valve seat, the flow path is blocked in the seated state, and the flow path is communicated in the seated state. One end of a linear shaft is coupled to the valve body, and the other end projects from the main body to the outside. When the shaft moves in a first direction which is a direction away from the main body along the length direction of the shaft, the valve body is separated from the valve seat and approaches the main body along the length direction. When the shaft moves in the second direction, the valve body is seated. A piston is disposed in a piston chamber formed in the main body, the piston is inserted through the shaft, and the shaft is movable in the first and second directions. A fluid supply / discharge port is provided in the main body, and the drive fluid is supplied to and discharged from the piston chamber so as to slide the piston in the first and second directions. The driving fluid can also be a gas or a liquid. An actuating member is provided on a protruding portion of the shaft from the main body. The actuating member protrudes outward from the shaft and has a surface on the main body side. A drive member is extrapolated to the shaft, and is screwed into the main body so that a part protrudes from the main body. The drive member advances and retreats in the first and second directions according to the screwed state. In the seated state of the valve body, the movement of the driving member in the first direction causes the driving member to move in the first direction by contacting the surface of the operating member on the main body side.

  With this configuration, when the screwing state of the driving member to the main body is changed so that the driving member moves in the first direction in a state where the valve body is seated, the driving member is moved to the main body of the operating member. When the screwing state of the drive member is changed, the actuating member moves in the first direction, and the shaft and the valve body move in the first direction along with this, and the valve body is moved. It can be separated from the valve seat. Therefore, there is no need to attach a jig or operate the attached shaft, and the work of forcibly opening the valve becomes easy. Further, the valve opening state can be adjusted by slightly moving the driving member in the first direction, and the adjustment can be performed by adjusting the screwing state of the driving member, and thus can be performed steplessly. Since the shaft is inserted without being connected to the piston, the shaft moves according to the movement of the piston even if the center of the piston and the center of the valve body do not completely match. There is no need to increase accuracy.

  Said aspect WHEREIN: The said drive member shall have a piston drive part which penetrate | invaded in the said main body along the said axis | shaft. According to the movement of the driving member in the second direction, the piston driving unit presses the piston in the second direction. Therefore, the piston can be pressed in the second direction by changing the screwing state of the drive member so that the drive member moves in the second direction, and the shaft and the valve body are moved in the second direction accordingly. The valve can be forcibly closed by manual operation. Therefore, the valve can be forcibly opened or closed by manual operation.

  In the above aspect, the actuating member may have a surface on the side opposite to the surface on the main body side. The drive member is formed so as to be able to come into contact with this surface, and the actuating member moves in the second direction as the drive member moves in the second direction. If comprised in this way, it can be made to open a valve compulsorily by changing the screwing state of a drive member so that the contact state of the drive member with respect to two surfaces of an operation member may change.

  In the above aspect, in a state where the valve body is seated on the valve seat, the driving member has a surface close to the surface of the operating member, and is covered by the operating member on the surface of the driving member. A valve opening instruction mark that can be seen from the outside in accordance with the movement of the shaft in the first direction may be provided in the portion. With this configuration, when the piston moves in the first direction by the driving fluid and opens, the shaft also moves in the first direction. Therefore, the operating member and the driving member are separated, and the driving member The valve opening instruction mark can be confirmed from the outside, and it can be confirmed that the valve is open.

  In the above aspect, in a state where the valve body is seated on the valve seat, a portion in the main body of the shaft that protrudes from the main body according to the movement of the shaft in the first direction, A valve opening instruction mark can be provided. With this configuration, when the piston moves in the first direction by the driving fluid and opens, the shaft also moves in the first direction, and the valve opening instruction mark that has been in the main body is formed. The shaft portion projects outside the main body, and the valve opening instruction mark can be confirmed from the outside, so that it can be confirmed that the valve is open.

  In the case of the above aspect, when the drive member is provided with the piston drive unit in the above aspect, or in the above aspect, when the drive member can contact two surfaces of the operating member, the drive member can be manually operated. It can have a handle. If comprised in this way, operation of a drive member will become easy and the operation | work which forcibly opens and closes a valve will also become easy.

  As described above, the on-off valve according to the present invention can be easily opened manually, and can be operated smoothly without increasing the assembly accuracy of the piston and the valve body.

It is a vertical front view which shows the valve closing state of the on-off valve of the 1st Embodiment of this invention. It is a vertical front view which shows the valve opening state of the on-off valve of FIG. It is a longitudinal front view which shows the state which closed the valve of FIG. 1 from the valve opening state by manual operation. It is a longitudinal front view which shows the state which opened the on-off valve of FIG. 1 from the valve closing state by manual operation. It is a front view of the on-off valve of FIG. It is a perspective view which shows the valve closing state and valve opening state of the on-off valve of FIG. It is a vertical front view of the on-off valve of the 2nd Embodiment of this invention. It is a partial omission vertical front view of the on-off valve of the 3rd Embodiment of this invention. It is a partial omission vertical front view of the on-off valve of the 4th Embodiment of this invention. It is a partial omission vertical front view of the on-off valve of the 5th Embodiment of this invention.

  The on-off valve of the first embodiment of the present invention is used as, for example, a container valve, is attached to a container containing a fluid, for example, a gas, and is normally closed, and a driving fluid, for example, When air is supplied, the valve is switched to an open state, and gas is discharged from the container. In addition, this on-off valve is manually switched to the closed state in the opened state, or manually switched to the closed state in the closed state, and the opening or closing degree of the valve in the opened or closed state is manually set. It is adjustable. Below, for convenience, it demonstrates on the assumption that this on-off valve is arrange | positioned along an up-down direction, but it does not necessarily have to be arrange | positioned at an up-down direction.

  This on-off valve has a main body 2 as shown in FIG. The main body 2 includes a valve housing 4, a pilot cylinder flange 6, a pilot cylinder housing 8, and a pilot cylinder cover 10. The pilot cylinder housing 8 is disposed on the valve housing 4 via the pilot cylinder flange 6. A pilot cylinder cover 10 is disposed on the pilot cylinder housing 8.

  As shown in FIGS. 1 to 4, the valve housing 4 has a substantially T-shaped longitudinal sectional shape, and is composed of, for example, a columnar vertical portion 4 a and a horizontal portion 4 b of a short prism shape, for example. The upper end surface of the vertical portion 4a is coupled to the center of the lower surface of the horizontal portion 4a. For example, a gas inflow port 12 is formed from the lower end of the vertical portion 4a toward the upper side. An inflow path 14 is formed linearly from the inner depth of the inflow port 12 toward the horizontal portion 4b along the length direction of the vertical portion 4a. A gas outlet 16 is formed from the right end surface of the horizontal portion 4b toward the inside thereof, and the outlet channel is formed in a straight line from the inner back of the outlet 16 to the back along the length direction of the horizontal portion 4b. 18 is formed. The inflow path 14 and the outflow path 18 are communicated with each other by a cylinder 20 formed substantially at the center of the horizontal portion 4b. The cylinder 20 is formed on the extended line of the inflow passage 14 with a diameter larger than the diameter of the inflow passage 14 along the vertical direction.

  A valve seat 22 is formed at a boundary portion between the inflow passage 14 and the cylinder 20. The main valve 24 is disposed in the cylinder 20 so as to be seated on and away from the valve seat 22 by moving forward and backward along the vertical direction. A main valve holder 26 is disposed at the upper end of the main valve 24. The main valve holder 26 also has a substantially T-shaped vertical cross-section, and the main valve 24 is attached to the lower end of the vertical portion 26a so that the vertical portion 26a and the upper portion of the main valve 24 following the vertical portion 26a are enclosed. Is attached with a main valve holder cover 28. The main valve 24, the main valve holder 26, and the main valve holder cover 28 constitute a valve body. When the main valve 24 is seated on the valve seat 22, the inflow path 14 and the outflow path 18 are shut off and closed, and when separated, the inflow path 14 and the outflow path 18 are communicated to open. It is in a valve state.

  One end of the lower shaft 30 is coupled to the upper surface of the horizontal portion 26 b of the main valve holder 26. The lower shaft 30 extends linearly upward through the pilot cylinder flange 6 and into the pilot cylinder housing 8. At the upper end of the cylinder 20, a recess 32 that continues to the cylinder 20 and opens to the upper end of the valve housing 4 is formed. A lower spindle guide 34 is disposed so as to seal the cylinder 20 at the boundary between the recess 32 and the cylinder 20. A lower shaft 30 extends into the pilot cylinder housing 8 through the lower main shaft guide 34.

  The pilot cylinder housing 8 is also in the shape of a prism, for example, and has a recess 36 facing the recess 32 upward from its lower end. In the space formed by the recess 32 in which the lower shaft 30 extends upward in the recess 36, the pilot cylinder flange 6 and the recess 36, the portion of the lower shaft 30 in this space and the lower main shaft A shaft sealing sleeve 38 is disposed so as to surround the guide 34. The sleeve 38 is fixed to the recess 32. The shaft sealing sleeve 38 is in close contact with the lower main shaft guide 34, but is disposed with a gap from the lower shaft 30. A main shaft seal 40, an O-ring holder 42, and an upper main shaft guide 44 are sequentially arranged in the shaft seal sleeve 38 from the lower main shaft guide 34 side upward so as to fill this gap. The O-ring holder 42 holds an O-ring 46 for the lower shaft 30 and an O-ring 48 for the shaft sealing sleeve 38. In this on-off valve, many O-rings are used in addition to the above-described O-rings, but those that are not directly related to the gist of the present invention are illustrated but not described in detail.

  A pilot cylinder 50 is formed in the pilot cylinder housing 8 so as to open on the upper surface and go downward. The opening on the upper surface is closed by a pilot cylinder cover 10. The pilot cylinder 50 communicates with the recess 36 through the through hole 52. The through hole 52 is formed to have a larger diameter than the lower shaft 30. A pilot piston 54 is disposed in the pilot cylinder 50. A substantially central portion of the pilot piston 50 is disposed on the lower shaft 30 so as to be slidable in the vertical direction. A sleeve 56 that enters the through hole 52 is formed at the center of the lower surface of the pilot piston 50. The outer peripheral surface of the sleeve 56 is in close contact with the surface of the through hole 52. The lower shaft 30 enters the sleeve 56, and the tip thereof is located near the upper surface of the pilot piston 50. An upper shaft 58 enters the pilot cylinder 50 from the outside through a through-hole 57 formed in the pilot cylinder cover 10 along the vertical direction, and passes through the pilot piston 54 in the inside thereof from the upper surface thereof, and the sleeve 56. It extends straight inward.

  The upper shaft 58 has a larger diameter than the lower shaft, and the lower shaft 30 enters the inside from the lower end thereof, and both are screwed to form one linear shaft. A lower end portion in the sleeve 56 of the upper shaft 58 is formed with a larger diameter than other portions of the upper shaft 58 and serves as an engaging portion 58 a that contacts the inner surface of the sleeve 56. In order to engage with the engaging portion 58a, the vicinity of the upper end portion in the sleeve 56 is formed into a stepped locking portion 54a with a reduced diameter. The pilot piston 54 is engaged with the upper shaft 58 by the engaging portion 58a and the locking portion 54a. When the upper shaft 58 and the lower shaft 30 are moved up and down, the pilot piston 54 is moved up and down along with this. And the lower shaft 30 are not fixed. Therefore, the center of the pilot piston and the valve body 24 does not need to be completely coincident with the center of the lower shaft 30 and the upper shaft 58, and the assembly accuracy of the pilot piston 50 does not need to be increased.

  In order to supply a driving fluid such as air into the pilot cylinder 50, a pilot passage 60 communicating with the lower surface of the pilot cylinder 50 is formed in the pilot cylinder housing 8 in the vertical direction. A pilot supply / exhaust port 62 connected to the pilot passage 60 and communicated with the outside world is formed on one side surface of the pilot cylinder housing 8.

  Between the upper surface of the pilot piston 54 and the pilot piston cover 10, elastic means, for example, a plurality of coil springs 64 are arranged. These coil springs 64 press the pilot piston 54 toward the valve seat 22, and as a result, the main valve 24 is seated on the valve seat 22 and the inflow path 14 and the outflow path 18 are blocked.

  Therefore, in the state where the air at the pilot supply / exhaust port 62 is not supplied, as shown in FIG. 1, the main valve 24 is seated on the valve seat 22, and the inflow path 14 and the outflow path 16 are blocked and closed. It is in a valve state. That is, this on-off valve is normally closed.

  When air is supplied to the pilot supply / exhaust port 62 in this closed state, the pilot piston 54 moves in the first direction, that is, upward, against the pressing force of the coil spring 64, as shown in FIG. Along with this, the upper shaft 58 and the lower shaft 30 also move upward, and the main valve 24 coupled to the lower shaft 30 also moves upward. As a result, the main valve 24 is separated from the valve seat 22, the inflow path 14 and the outflow path 18 are communicated, and the valve is opened.

  When air is exhausted from the pilot supply / exhaust port 62 in this valve open state, the pilot piston 54 moves in the second direction, that is, downward, by the pressing force of the coil spring 64. Accordingly, the upper shaft 58 and the lower shaft 30 also move downward, and the main valve 24 coupled to the lower shaft 30 is seated on the valve seat 22 as shown in FIG. Is shut off and the valve is closed.

  In the valve-closed state, the tip of the upper shaft 58 protrudes upward from the pilot cylinder cover 10, and is in close contact with the outer periphery of the upper shaft 58, so that the sleeve-shaped indicator rod 66 extends from the vicinity of the protruding end of the pilot piston 54. Extends to the top. An operating member such as an indicator flange 68 is attached to the upper shaft 58 with a nut 69 so as to contact the upper end of the indicator rod 66. The indicator flange 68 has a disk shape whose diameter is larger than that of the upper shaft 58. Between the indicator flange 68 and the upper surface of the pilot cylinder cover 10, a drive member, for example, a head 70a of the manual operation bolt 70 is located. The upper surface of the head 70a is close to the lower surface of the indicator flange 68 in the valve-closed state. A piston drive part, for example, a sleeve part 70b, enters the through hole 57 from the lower surface of the head part 70a so as to surround the indicator rod 66. The lower end of the sleeve 70b is located in the vicinity of the upper surface of the pilot piston 54 in the closed state. A male screw portion 70 c is formed near the upper end of the sleeve 70 b, and the male screw portion 70 c is screwed into a female screw portion 57 a formed in the through hole 57.

  Therefore, the manual operation bolt 70 changes the threaded state of the male threaded portion 70c to the female threaded portion 57a so that the head 70a is separated from the pilot cylinder cover 10 and the lower end of the sleeve 70b is separated from the upper surface of the pilot piston 54. The head 70a can be moved close to the pilot cylinder cover 10 and the male screw 70a can be lowered so as to contact the upper surface of the pilot piston 54. In addition, the spacer 71 is arrange | positioned so that the head part 70a and the pilot cylinder cover 10 may contact in a valve closing state, and the valve closing state is maintained.

  Then, when the operation bolt 70 is rotated so that the head 70 a is lowered in the valve open state, and the lower surface of the head 70 a approaches the pilot cylinder cover 10, the lower end of the sleeve 70 b presses the upper surface of the pilot piston 54. The length of the sleeve 70b is selected so that the main valve 24 is completely seated on the valve seat 22 by pushing the pilot piston 54 downward. Further, in the valve-closed state, the operation bolt 70 is rotated so that the head portion 70a is raised, the upper surface of the head portion 70a comes into contact with the lower surface of the indicator flange 68, and the indicator flange 68 is lifted. The main valve 24 can be completely separated from the valve seat 22 by raising. At this time, the length of the male screw portion 70c is selected so that the male screw portion 70c does not come out of the through hole 57.

  Therefore, in the case where the valve is not completely closed for some reason in the closed state as shown in FIG. 1, the manual operation bolt 70 is rotated so as to be lowered, and the pilot piston 54 is rotated at the lower end of the sleeve 70c. By pushing the upper surface, the main valve 24 is moved to the valve seat 22 side, and the main valve 24 can be completely seated on the valve seat 22. That is, the closing degree of the main valve 24 can be adjusted manually.

  Further, when the valve cannot be closed due to, for example, defective exhaust of air in the valve open state, the sleeve 70b presses the upper surface of the pilot piston 54 by rotating the manual operation bolt 70 in the same manner as described above. The main valve 24 is moved to the valve seat 22 side, and the main valve 24 can be completely seated on the valve seat 22 as shown in FIG. In this case, the operation bolt 70 is operated after the spacer 71 is rotated so as to be detached from the lower surface of the head of the operation bolt 70.

  Similarly, when the valve is not completely opened for some reason in the valve opening state shown in FIG. 2, the manual operation bolt 70 is rotated to be raised and the indicator flange 68 is lifted by the head 70a. Thus, the main valve 24 can be lifted from the valve seat 2 and the main valve 24 can be completely separated from the valve seat 22. That is, the opening degree of the main valve 24 can be adjusted manually.

  Further, when the valve cannot be opened due to, for example, poor air supply in the valve closed state, the head 70a is rotated so as to be lifted in the same manner as described above, so that the head 70a is moved to the indicator flange 68. The main valve 24 can be raised by pushing and the main valve 24 can be completely separated from the valve seat 22 as shown in FIG. The manual separation of the main valve 24 from the valve seat 22 can be reliably performed because the shaft composed of the lower shaft 30 and the upper shaft 58 coupled to the main valve 24 is directly driven. .

  The head portion 70a of the manual operation bolt 70 is formed to have a diameter larger than that of the indicator flange 68. On the upper surface of the head portion 70a, for example, a circumferential valve opening instruction mark 72 is shown in FIG. It is formed as follows. In the closed state, the valve opening instruction mark 72 is hidden by the indicator flange 68 and cannot be observed from the outside as shown in FIG. However, the valve opening instruction mark 72 is formed at a position where it can be observed from the outside as shown in FIG. Therefore, when the valve opening instruction mark 72 can be observed from the outside, the operator can easily understand that the valve opening state is in the valve opening state.

  In the valve housing 4, a safety valve mounting port 74 is formed on the side surface opposite to the side surface of the horizontal portion 4 b where the outflow passage 16 is provided, and the inflow port 12 communicates with the safety valve mounting port 74. A safety valve passage 76 is formed in the valve housing 4. A safety valve (not shown) is attached to the safety valve attachment port 74.

  A male screw 78 is formed on the outer periphery of the vertical portion 4b of the valve housing 4 where the inlet 12 is formed. An O-ring 80 and a flange nut 82 are attached to the vertical portion 4a between the male screw 78 and the horizontal portion 4b in this order from the male screw 78 side. In order to attach this container valve to the container, the male thread 78 is screwed into the female thread formed in the container until the O-ring 80 contacts the container. The flange nut 82 has a female screw 86 on its inner peripheral surface that is screwed with a male screw 84 formed on the vertical portion 4a so that its mounting position can be moved up and down.

  The flange nut 82 is provided for the following reason. After the opening / closing valve is attached to the container valve, the container valve may be replaced with another opening / closing valve having the same structure. In this case, the length of the male screw 78 of another on-off valve may slightly differ from the on-off valve before replacement. When this other on-off valve is completely screwed into the female screw of the container, the position of the outlet 16 is different from the position of the outlet 16 of the on-off valve before replacement, around the central axis of the male screw 78. It will rotate. Then, for example, when the length of the hose connected to the outlet 16 is set to the shortest, the connector of this hose cannot be connected to the outlet 16, and a new hose must be prepared. Similarly, since the position of the safety valve mounting port 74 is also rotated, there may be a case where the safety valve cannot be installed in a safety valve installation space that is predetermined based on the position of the safety valve mounting port 74 of the safety valve before replacement.

  Therefore, the flange nut 82 is moved forward and backward in the length direction of the vertical portion 4b to adjust the screwed state of the male screw 78 to the female screw of the container, so that the position of the outlet 16 and the safety valve mounting port 74 is the opening / closing valve. The position is the same as before the replacement.

  FIG. 7 shows an on-off valve according to the second embodiment of the present invention. The on-off valve of this embodiment is a normally open valve, the direction of the pilot piston 54 is opposite to that of the pilot piston of the first embodiment, and the pilot flow path 60 and the pilot mounting port 74 are connected to the pilot cylinder cover 10. The coil spring 64 is configured in the same manner as the on-off valve of the first embodiment except that the coil spring 64 is disposed between the pilot piston 54 and the pilot cylinder housing 8. Equivalent parts are denoted by the same reference numerals and description thereof is omitted.

  A third embodiment of the present invention is shown in FIG. The on-off valve of this embodiment is formed by integrally forming a handle 73 on the head portion 70a of the manual operation bolt 70 in the first or second embodiment in order to facilitate the rotation operation. Other configurations are the same as those in the first or second embodiment.

  A fourth embodiment of the present invention is shown in FIG. In the on-off valve of this embodiment, not the indicator flange 68 but an additional flange 68a is provided on the upper portion of the upper shaft 58 as an operating member. The head 70a of the operation bolt 70 comes into contact with the lower surface of the flange 68a so that the flange 68a can be operated. Further, a sleeve-like extension portion 70d is formed from the outer periphery of the head portion 70a toward the upper side, and the upper end portion thereof is located above the flange 68a. A disc-shaped indicator portion 70e is attached to the upper end portion, and the lower surface thereof is located above the upper surface of the flange 68a. The indicator flange 68 is attached to the upper shaft 58 so that the lower surface of the indicator flange 68 is located slightly above the upper surface of the indicator portion 70. A valve opening instruction mark 72 is formed on the upper surface of the indicator portion 70d so as to be hidden by the indicator flange 68 in the valve closing state. Since other configurations are the same as those of the on-off valve of the first embodiment, the same portions are denoted by the same reference numerals and description thereof is omitted.

  In this on-off valve, when air is supplied into the pilot cylinder 50 in the closed state, the valve is opened in the same manner as in the first embodiment. At that time, the indicator flange 68 is raised, and the valve opening instruction mark 72 is displayed. The operator can confirm from the outside that the valve is open.

  In this valve open state, the upper surface of the flange 68a is approaching the lower surface of the indicator part 70e. Accordingly, when the extension portion 70d is rotated so that the operation bolt 70 is lowered, the lower surface of the indicator portion 70e comes into contact with the upper surface of the flange 68a. When the extension portion 70d is further lowered in this contact state, the flange 68a is pressed by the indicator portion 70e, the flange portion 68a and the upper shaft 58 are lowered, the main valve 24 is seated on the valve seat 24, and the valve closed state is established. Become.

  In addition, when the extended portion 70d of the operation bolt 70 is rotated so that the operation bolt 70 is raised in the valve closed state of FIG. 9, the upper surface of the head 70a contacts the lower surface of the flange 68a. When the extension portion 70d is further rotated to rise in this contact state, the flange 68 and the upper shaft 58 are raised by the head portion 70a, the main valve 24 is separated from the valve seat 22, and the valve is opened.

  The on-off valve of the fifth embodiment of the present invention is shown in FIG. In the on-off valve of this embodiment, an open / close instruction mark 72 is provided on the outer periphery of the upper shaft 58, and the indicator flange 68 is removed. The open / close instruction mark 72 is formed on the upper surface of the indicator portion 70e so that it cannot be observed from the outside when the valve is closed. However, when air is supplied to the pilot cylinder 50 and the upper shaft 58 is raised, the opening / closing instruction mark 72 is formed so as to protrude above the indicator portion 70e. Accordingly, the indicator flange 68 is not necessary, and the configuration of the on-off valve is simplified. Since other configurations are the same as those of the fourth embodiment, the same reference numerals are given and description thereof is omitted.

  Although the on-off valve of each of the above embodiments is used as a container valve, it can also be used as an on-off valve used for other purposes. Moreover, although the on-off valve of each said embodiment demonstrated as what interrupts | blocks and open | releases gas, it can also be used as what interrupts | blocks and open | releases a liquid. In the on-off valve of the above embodiment, air is used as the driving fluid, but other gases can be used, and other liquids such as pressure oil can be used.

  In each of the above embodiments, the outlet 16 is provided on one side surface of the horizontal portion 4b of the valve housing 4, and the inlet 12 is provided at the lower end of the vertical portion 4a. Conversely, the inlet is provided in the horizontal portion 4b. In addition, an outlet can be provided in the vertical portion. In each of the above embodiments, a T-shaped valve housing is used. However, an L-shaped valve housing having a horizontal portion and a vertical portion can be used. In this case, an inflow port may be provided at the outer end of the horizontal portion, and an outflow port may be provided at the end surface of the vertical portion on the side where the horizontal portion and the vertical portion intersect. In each of the embodiments described above, a combination of the lower shaft 30 and the upper shaft 58 is used as the shaft, but a single shaft can also be used. Further, in each of the above-described embodiments, the horizontal portion 4b of the valve housing 4 and the pilot cylinder housing 8 are prismatic ones, but cylindrical ones can also be used. In the first to third embodiments, the pilot piston 54 is pressed downward by using the sleeve 70b of the operation bolt 70 so as to change from the valve open state to the valve close state. The length of the sleeve 70b can be shortened so that the head 70a of the operation bolt 70 can be changed from the normally closed state to the normally open state. Also in the fourth and fifth embodiments, a handle can be provided on the operation bolt 70 as in the third embodiment.

2 Body 12 Inlet 14 Inflow path (flow path)
16 Outlet 18 Outflow path (flow path)
22 Valve seat 24 Valve body 30 Lower shaft (shaft)
50 Pilot cylinder (piston chamber)
54 Pilot Piston (Piston)
58 Upper shaft (axis)
62 Air supply / exhaust port 68 Indicator flange (actuating member)
70 Operation bolt (drive member)

Claims (6)

The body,
An inflow port and an outflow port of fluid provided in the main body so as to be open to the outside and apart from each other;
A flow path formed by connecting the inlet and the outlet in the main body;
A valve seat provided in the middle of the flow path;
A valve body provided in the main body so as to be able to be seated and separated from the valve seat;
One end is coupled to the valve body, the other end protrudes from the main body to the outside, is linearly provided in the main body, and moves in a first direction that is a direction away from the main body along its length direction. When the valve body is separated from the valve seat and moved in a second direction that is a direction approaching the main body along the length direction, the shaft on which the valve body is seated,
A piston which is disposed in a piston chamber formed in the main body and is inserted through the shaft, and is capable of moving the shaft in the first and second directions;
A supply / discharge port provided in the main body, for supplying and discharging a driving fluid to and from the piston chamber so as to slide the piston in the first and second directions;
An operating member provided at a protruding portion of the shaft from the main body, protruding outward from the shaft, and having a surface on the main body side;
Along with the extrapolation to the shaft, it is screwed into the main body so that a part of the main body protrudes, and moves forward and backward in the first and second directions according to the screwed state. A drive member that contacts the body-side surface of the actuating member by movement in the first direction in the seated state and moves the actuating member in the first direction;
On-off valve having.   2. The on-off valve according to claim 1, wherein the drive member has a piston drive part that has entered the main body along the axis, and the piston drive part moves in the second direction of the drive member. An on-off valve that presses the valve in the second direction.   2. The on-off valve according to claim 1, wherein the actuating member has a surface on a side opposite to the surface on the main body side, the driving member is formed so as to be able to come into contact with the surface, and a second of the driving member is formed. An on-off valve in which the actuating member moves in the second direction as it moves in the direction.   2. The on-off valve according to claim 1, wherein the driving member has a surface that is close to the surface of the operating member in a state in which the valve body is seated on the valve seat, and the operating member on the surface of the driving member. An opening / closing valve provided with a valve opening instruction mark visible from the outside in accordance with the movement of the shaft in the first direction.   2. The on-off valve according to claim 1, wherein the valve body is a portion in the main body of the shaft, and protrudes from the main body according to the movement of the shaft in the first direction when the valve body is seated on the valve seat. An open / close valve that is provided with a valve opening instruction mark. 4. The on-off valve according to claim 1, wherein the driving member has a handle that can be manually operated.

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