US20020084434A1 - Lock device and lock method for knife gate valves - Google Patents
Lock device and lock method for knife gate valves Download PDFInfo
- Publication number
- US20020084434A1 US20020084434A1 US09/750,271 US75027100A US2002084434A1 US 20020084434 A1 US20020084434 A1 US 20020084434A1 US 75027100 A US75027100 A US 75027100A US 2002084434 A1 US2002084434 A1 US 2002084434A1
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- United States
- Prior art keywords
- swivel lock
- shaft
- lock member
- knife
- locking device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K35/00—Means to prevent accidental or unauthorised actuation
Definitions
- the present invention relates generally to a lock device and lock method for a valve, such as a knife gate valve. More particularly, the invention relates to a lock device and method that can lock the valve in a position such as an open and/or closed position.
- Knik gate valves which may have a knife gate element that reciprocates between open and closed positions.
- the knife generally moves in a reciprocating linear manner across the area of the fluid channel to form a gate by being actuated by an actuator such as a hydraulic or pneumatic actuator.
- the present invention provides a device and method for locking a knife gate valve in a position, such as an open and/or closed position.
- the invention can provide benefits such as preventing accidental opening or closing of the valve.
- the invention provides a locking device for a knife gate valve having a housing and a reciprocating shaft that reciprocates a knife in back and forth directions.
- the locking device has a pair of first posts disposed substantially parallel to the shaft, each first post having one end mounted to the housing, and each first post having a first engageable portion.
- a swivel lock member is mounted to rotate substantially about the axis of the shaft and to reciprocate together with the shaft and the knife.
- the swivel lock member is selectively rotatable between (1) an unlocked position at which the swivel lock member does not engage the first engageable portions and (2) a locked position at which the swivel lock member engages both of the first engageable portions to prevent the swivel lock member from movement in at least one of the back and forth directions along the axis of the shaft, thereby preventing the shaft and the knife from reciprocating movement in at least one of the back and forth directions when the swivel lock member is in the locked position and engaging the first engageable portions.
- the invention provides a pair of second posts disposed substantially parallel to the shaft, each second post having one end mounted to the housing, and each second post has a second engageable portion.
- the swivel lock is rotatable to a locked position at which the engaging portions each engage one of the second engageable portions to prevent the swivel lock member from movement in at least one of the back and forth directions along the axis of the shaft, thereby preventing the shaft and the knife from reciprocating movement in one of the back and forth directions when the swivel lock is in the locked position and engaging the second engageable portions.
- the invention provides a method for locking a knife gate valve having a housing and a reciprocating shaft that reciprocates a knife in back and forth directions and has a pair of first posts disposed substantially parallel to the shaft, each first post having one end mounted to the housing, and each first post having a first engageable portion comprising the steps of positioning the knife in a desired position.
- the rotating a swivel lock member is rotated substantially about the axis of the shaft into a locked position at which the swivel lock member engages both of the first engageable portions to prevent the swivel lock member from movement in at least one of the back and forth directions along the axis of the shaft, thereby preventing the shaft and the knife from reciprocating movement in at least one of the back and forth directions when the swivel lock member is in the locked position and engaging the first engageable portions.
- FIG. 1 is a perspective view of a valve unlocked in a lowered, closed position.
- FIG. 2 is a perspective view of a valve locked in a raised, open position.
- FIG. 3 is a perspective view of a valve locked in a lowered, closed position.
- FIG. 4 is a side view of a valve and cylinder actuator, with the valve locked in a lowered, closed position.
- FIG. 5 is a side view of a valve and cylinder actuator, with the valve locked in a raised, open position.
- FIG. 6 is a cross sectional view taken along line 6 - 6 in FIG. 4.
- FIG. 7 is a side detail view of a swivel lock with a padlock installed.
- FIG. 1 there is shown a valve 10 having a housing 12 .
- a knife 14 slides through opening 16 in the housing 12 .
- Reciprocation of the knife 14 in a gate of the valve 10 opens and closes the fluid path in the valve 10 .
- the movement of the knife 14 is described herein for convenience as being vertical, with raised and lowered positions.
- the valve 10 may of course be oriented in any direction, and the knife 14 may actually reciprocate horizontally or in any angled direction relative to the ground.
- the knife 14 is moved vertically by a shaft 18 , and is attached to the shaft 18 by a clamp 20 .
- the clamp 20 has a shaft portion 21 that is attached to the lower end of the shaft 18 .
- the shaft 18 is moved vertically by a cylinder actuator 22 which may be hydraulic, pneumatic, electrical or powered by any suitable means.
- a swivel lock 24 is attached to the clamp 20 adjacent to the end of the shaft 18 .
- the swivel lock 24 has an internal bore with a bearing 25 sized to fit on an outer surface of the shaft portion 21 of the clamp 20 , so that the swivel lock 24 can freely rotate around the axis of the shaft portion 21 , but is restrained so that it cannot travel upwardly or downwardly along the shaft portion 21 in the direction of the axis of the shaft 18 .
- the swivel lock 24 can alternatively be mounted to the shaft 18 so that the swivel lock 24 swivels around the shaft 18 but does not move axially along the shaft 18 .
- the swivel lock has indentations 26 , 27 that can engage posts 28 , 32 , 36 and 40 as described below.
- An upper post 28 extends downwardly from the cylinder actuator 22 and has a head 30 .
- a second upper post 32 extends downwardly from the cylinder actuator 22 and has a head 34 .
- a lower post 36 extends upwardly from the housing 12 and has a head 38 .
- a second lower post 40 extends upwardly from the housing 12 and has a head 42 .
- Side supports 44 and 46 connect the housing 12 and the cylinder actuator 22 .
- the heads 30 , 34 , 38 and 42 form a change in diameter of the posts, and together with the adjacent regions of the posts the heads form an engageable portion that can be engaged in the indentations 26 and 27 of the swivel lock 24 .
- FIG. 2 shows the valve 10 in an upright and locked position with the knife 14 extending from the opening 16 of the housing 12 , and attached to the shaft 18 by the clamp 20 .
- the shaft 18 in this position is retracted due to force exerted by the cylinder actuator 22 to open the valve.
- the swivel lock 24 adjacent the clamp 20 is engaged with and in contact with the upper posts 28 , 32 .
- the indentation 27 fits partially around the diameter of post 32 , and has a smaller diameter than head 34 , so that the swivel lock 20 cannot move axially past the head 30 .
- the swivel lock 24 has a vertical slot 50 with webbing 52 .
- the swivel lock 24 has a hole 56 perpendicular to the axis of rotation of the swivel lock 24 at the vertical slot 50 in which a set screw 54 (see FIG. 7) may be inserted to prevent the swivel lock 24 from rotating from the position it is in when the set screw 54 is installed.
- the set screw 54 can also be used to hold the swivel lock 24 in the unlocked position shown in FIG. 1.
- the shaft 18 may have a dimple or indentation to receive the set screw 54 when the swivel lock 24 is rotated to a certain position.
- the set screw 54 may engage the cylindrical surface of the shaft 18 and frictionally engage it with sufficient force to prevent rotation of the swivel lock 24 until the set screw 54 is released.
- the set screw need not be removed once installed; it can be backed off to permit rotation of the swivel member and can be tightened to hold the swivel member in the locked or unlocked position.
- an obstructing member 70 may be inserted through the slot 50 to obstruct access to the head of the set screw 54 , so that the set screw 54 cannot be loosened until the obstructing member 70 is removed.
- the obstructing member 70 is a padlock, although in some instances it may be desirable to use other locks, pins or other obstructing devices.
- a safety lockout hasp may be used, which is a hasp to which several padlocks can be separately attached and detached, so that different users can place and remove individual padlocks and all padlocks must be removed to remove the hasp.
- FIG. 3 shows the valve 10 in a lowered and locked position with the knife 14 inserted into the opening 16 of the housing 12 .
- the shaft 18 in this position is extended downward due to force exerted by the cylinder actuator 22 to close the valve.
- the swivel lock 24 is engaged and in contact with the lower posts 36 , 40 .
- the indentation 27 fits partially around the diameter of post 40 , and has a smaller diameter than head 42 , so that the swivel lock 20 cannot move axially past the head 42 .
- the swivel lock 24 engaging the posts are possible.
- the posts may have one or more areas with a reduced diameter that can be engaged by the indentations 26 , 27 of the swivel lock 24 .
- the swivel lock 24 may have projections that engage slots or holes in the posts.
- pairs of upper and lower posts are described, a pair of single rods spanning from the housing 12 to the actuator 22 can also be used.
- the swivel member 24 could engage with any structure besides posts, such as one or more beams or plates with indentations or projections, or any other structure that engages with the swivel lock when rotated to a certain position.
- Rotating the swivel lock in one direction causes it to engage the posts to prevent vertical movement of the knife (i.e., locks the knife).
- Rotating the swivel lock in the other direction causes the swivel lock 24 to disengage from the posts to permit vertical movement of the knife (i.e., unlocks the knife).
- the swivel lock 24 is rotatable manually. Alternatively the swivel lock 24 may be power operated and/or rotated via remote control.
- valve open locking position of the swivel lock and the valve closed locking position of the swivel lock are at the same rotational position about the axis and are at different axial locations along the axis. However, if the posts are positioned differently, the swivel lock may have a valve open locking position that is rotationally different than the valve open locking position.
- FIG. 4 shows a perspective view of the valve 10 in combination with the valve apparatus 60 of the valve 10 .
- the valve 10 is in the lowered, locked position.
- FIG. 5 shows a perspective view of the valve 10 in the upright and locked position.
- the vertical slot 50 is pictured without the set screw 54 inserted.
- FIG. 6 shows a cross sectional view of the valve 10 taken along line 6 - 6 in FIG. 4.
- the valve 10 is in the lowered and locked position.
- the swivel lock 24 is engaged and in contact with the lower posts 36 , 40 .
- FIG. 7 shows the swivel lock 24 with a an obstructing member 70 in the form of a padlock inserted through the vertical slot.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Preventing Unauthorised Actuation Of Valves (AREA)
Abstract
Description
- The present invention relates generally to a lock device and lock method for a valve, such as a knife gate valve. More particularly, the invention relates to a lock device and method that can lock the valve in a position such as an open and/or closed position.
- Various valves are known, including knife gate valves, which may have a knife gate element that reciprocates between open and closed positions. The knife generally moves in a reciprocating linear manner across the area of the fluid channel to form a gate by being actuated by an actuator such as a hydraulic or pneumatic actuator.
- There is a need in the art for a simple, convenient, inexpensive device and method to lock the valve in the open and/or closed positions. For example, it may be desired to be able to lock the valve in an open position to avoid problems that might occur should the valve accidentally be activated to close at an improper time, such as during repair. Without a lock, the accidental closing of the valve could cause damage to a partially disassembled valve, or to parts located in the path of travel of the gate of the valve. Also, accidental opening or closing of a valve due to a control failure could damage other machinery associated with the flow system with which the valve is associated.
- The present invention provides a device and method for locking a knife gate valve in a position, such as an open and/or closed position. The invention can provide benefits such as preventing accidental opening or closing of the valve. In one aspect, the invention provides a locking device for a knife gate valve having a housing and a reciprocating shaft that reciprocates a knife in back and forth directions. The locking device has a pair of first posts disposed substantially parallel to the shaft, each first post having one end mounted to the housing, and each first post having a first engageable portion. A swivel lock member is mounted to rotate substantially about the axis of the shaft and to reciprocate together with the shaft and the knife. The swivel lock member is selectively rotatable between (1) an unlocked position at which the swivel lock member does not engage the first engageable portions and (2) a locked position at which the swivel lock member engages both of the first engageable portions to prevent the swivel lock member from movement in at least one of the back and forth directions along the axis of the shaft, thereby preventing the shaft and the knife from reciprocating movement in at least one of the back and forth directions when the swivel lock member is in the locked position and engaging the first engageable portions.
- In another aspect, the invention provides a pair of second posts disposed substantially parallel to the shaft, each second post having one end mounted to the housing, and each second post has a second engageable portion. The swivel lock is rotatable to a locked position at which the engaging portions each engage one of the second engageable portions to prevent the swivel lock member from movement in at least one of the back and forth directions along the axis of the shaft, thereby preventing the shaft and the knife from reciprocating movement in one of the back and forth directions when the swivel lock is in the locked position and engaging the second engageable portions.
- In still another aspect, the invention provides a method for locking a knife gate valve having a housing and a reciprocating shaft that reciprocates a knife in back and forth directions and has a pair of first posts disposed substantially parallel to the shaft, each first post having one end mounted to the housing, and each first post having a first engageable portion comprising the steps of positioning the knife in a desired position. The rotating a swivel lock member is rotated substantially about the axis of the shaft into a locked position at which the swivel lock member engages both of the first engageable portions to prevent the swivel lock member from movement in at least one of the back and forth directions along the axis of the shaft, thereby preventing the shaft and the knife from reciprocating movement in at least one of the back and forth directions when the swivel lock member is in the locked position and engaging the first engageable portions.
- There has thus been outlined, rather broadly, the more important features of the invention in order that the detailed description thereof that follows may be better understood, and in order that the present contribution to the art may be better appreciated. There are, of course, additional features of the invention that will be described below and which will form the subject matter of the claims appended hereto.
- In this respect, before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein, as well as the abstract included below, are for the purpose of description and should not be regarded as limiting.
- As such, those skilled in the art will appreciate that the conception upon which this disclosure is based may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. It is important, therefore, that the claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention.
- FIG. 1 is a perspective view of a valve unlocked in a lowered, closed position.
- FIG. 2 is a perspective view of a valve locked in a raised, open position.
- FIG. 3 is a perspective view of a valve locked in a lowered, closed position.
- FIG. 4 is a side view of a valve and cylinder actuator, with the valve locked in a lowered, closed position.
- FIG. 5 is a side view of a valve and cylinder actuator, with the valve locked in a raised, open position.
- FIG. 6 is a cross sectional view taken along line6-6 in FIG. 4.
- FIG. 7 is a side detail view of a swivel lock with a padlock installed.
- Referring now to the figures, wherein like reference numerals indicate like elements, in FIG. 1 there is shown a
valve 10 having ahousing 12. Aknife 14 slides through opening 16 in thehousing 12. Reciprocation of theknife 14 in a gate of thevalve 10 opens and closes the fluid path in thevalve 10. The movement of theknife 14 is described herein for convenience as being vertical, with raised and lowered positions. However, thevalve 10 may of course be oriented in any direction, and theknife 14 may actually reciprocate horizontally or in any angled direction relative to the ground. - The
knife 14 is moved vertically by ashaft 18, and is attached to theshaft 18 by aclamp 20. Theclamp 20 has ashaft portion 21 that is attached to the lower end of theshaft 18. Theshaft 18 is moved vertically by acylinder actuator 22 which may be hydraulic, pneumatic, electrical or powered by any suitable means. Aswivel lock 24 is attached to theclamp 20 adjacent to the end of theshaft 18. Theswivel lock 24 has an internal bore with abearing 25 sized to fit on an outer surface of theshaft portion 21 of theclamp 20, so that theswivel lock 24 can freely rotate around the axis of theshaft portion 21, but is restrained so that it cannot travel upwardly or downwardly along theshaft portion 21 in the direction of the axis of theshaft 18. Theswivel lock 24 can alternatively be mounted to theshaft 18 so that theswivel lock 24 swivels around theshaft 18 but does not move axially along theshaft 18. The swivel lock hasindentations posts - An
upper post 28 extends downwardly from thecylinder actuator 22 and has ahead 30. A secondupper post 32 extends downwardly from thecylinder actuator 22 and has ahead 34. Alower post 36 extends upwardly from thehousing 12 and has ahead 38. A secondlower post 40 extends upwardly from thehousing 12 and has ahead 42. Side supports 44 and 46 connect thehousing 12 and thecylinder actuator 22. Theheads indentations swivel lock 24. - FIG. 2 shows the
valve 10 in an upright and locked position with theknife 14 extending from the opening 16 of thehousing 12, and attached to theshaft 18 by theclamp 20. Theshaft 18 in this position is retracted due to force exerted by thecylinder actuator 22 to open the valve. Theswivel lock 24 adjacent theclamp 20 is engaged with and in contact with theupper posts indentation 27 fits partially around the diameter ofpost 32, and has a smaller diameter thanhead 34, so that theswivel lock 20 cannot move axially past thehead 30. - The
swivel lock 24 has avertical slot 50 withwebbing 52. Theswivel lock 24 has ahole 56 perpendicular to the axis of rotation of theswivel lock 24 at thevertical slot 50 in which a set screw 54 (see FIG. 7) may be inserted to prevent theswivel lock 24 from rotating from the position it is in when the set screw 54 is installed. The set screw 54 can also be used to hold theswivel lock 24 in the unlocked position shown in FIG. 1. Theshaft 18 may have a dimple or indentation to receive the set screw 54 when theswivel lock 24 is rotated to a certain position. Alternatively, the set screw 54 may engage the cylindrical surface of theshaft 18 and frictionally engage it with sufficient force to prevent rotation of theswivel lock 24 until the set screw 54 is released. In the preferred embodiment, the set screw need not be removed once installed; it can be backed off to permit rotation of the swivel member and can be tightened to hold the swivel member in the locked or unlocked position. - Once the set screw54 has been tightened to hold the
swivel lock 24 against rotation, an obstructing member 70 (see FIG. 7) may be inserted through theslot 50 to obstruct access to the head of the set screw 54, so that the set screw 54 cannot be loosened until the obstructingmember 70 is removed. In the preferred embodiment shown, the obstructingmember 70 is a padlock, although in some instances it may be desirable to use other locks, pins or other obstructing devices. For example, a safety lockout hasp may be used, which is a hasp to which several padlocks can be separately attached and detached, so that different users can place and remove individual padlocks and all padlocks must be removed to remove the hasp. - FIG. 3 shows the
valve 10 in a lowered and locked position with theknife 14 inserted into theopening 16 of thehousing 12. Theshaft 18 in this position is extended downward due to force exerted by thecylinder actuator 22 to close the valve. Theswivel lock 24 is engaged and in contact with thelower posts indentation 27 fits partially around the diameter ofpost 40, and has a smaller diameter thanhead 42, so that theswivel lock 20 cannot move axially past thehead 42. Of course other ways of theswivel lock 24 engaging the posts are possible. For example, the posts may have one or more areas with a reduced diameter that can be engaged by theindentations swivel lock 24. Alternatively theswivel lock 24 may have projections that engage slots or holes in the posts. Although pairs of upper and lower posts are described, a pair of single rods spanning from thehousing 12 to theactuator 22 can also be used. Alternatively, theswivel member 24 could engage with any structure besides posts, such as one or more beams or plates with indentations or projections, or any other structure that engages with the swivel lock when rotated to a certain position. Rotating the swivel lock in one direction causes it to engage the posts to prevent vertical movement of the knife (i.e., locks the knife). Rotating the swivel lock in the other direction causes theswivel lock 24 to disengage from the posts to permit vertical movement of the knife (i.e., unlocks the knife). Theswivel lock 24 is rotatable manually. Alternatively theswivel lock 24 may be power operated and/or rotated via remote control. - In the examples shown the valve open locking position of the swivel lock and the valve closed locking position of the swivel lock are at the same rotational position about the axis and are at different axial locations along the axis. However, if the posts are positioned differently, the swivel lock may have a valve open locking position that is rotationally different than the valve open locking position.
- FIG. 4 shows a perspective view of the
valve 10 in combination with thevalve apparatus 60 of thevalve 10. Thevalve 10 is in the lowered, locked position. - FIG. 5 shows a perspective view of the
valve 10 in the upright and locked position. Thevertical slot 50 is pictured without the set screw 54 inserted. - FIG. 6 shows a cross sectional view of the
valve 10 taken along line 6-6 in FIG. 4. Thevalve 10 is in the lowered and locked position. Theswivel lock 24 is engaged and in contact with thelower posts - FIG. 7 shows the
swivel lock 24 with a an obstructingmember 70 in the form of a padlock inserted through the vertical slot. - The above description and drawings are only illustrative of preferred embodiments which achieve the objects, features, and advantages of the present invention, and it is not intended that the present invention be limited thereto. Any modification of the present invention which comes within the spirit and scope of the following claims is considered to be part of the present invention.
Claims (17)
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US09/750,271 US6398184B1 (en) | 2000-12-29 | 2000-12-29 | Lock device and lock method for knife gate valves |
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US09/750,271 US6398184B1 (en) | 2000-12-29 | 2000-12-29 | Lock device and lock method for knife gate valves |
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US6398184B1 US6398184B1 (en) | 2002-06-04 |
US20020084434A1 true US20020084434A1 (en) | 2002-07-04 |
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US09/750,271 Expired - Lifetime US6398184B1 (en) | 2000-12-29 | 2000-12-29 | Lock device and lock method for knife gate valves |
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US5560233A (en) | 1993-06-14 | 1996-10-01 | Watkins; Gerald | Air brake valve shackle |
US6082393A (en) * | 1997-10-22 | 2000-07-04 | Tye; Randy G. | Emergency shutoff valve exerciser for steam turbine and methods for installing and operating same |
US6170882B1 (en) * | 1998-04-13 | 2001-01-09 | J. David Prest | Coupling for waste water outlets |
US6007047A (en) * | 1998-06-05 | 1999-12-28 | Phipps; Jack M. | Rotary actuator for stem valves |
US6044860A (en) | 1999-02-01 | 2000-04-04 | Spx Corporation | Adjustable lockout device for knife gate valves |
-
2000
- 2000-12-29 US US09/750,271 patent/US6398184B1/en not_active Expired - Lifetime
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