US20140246105A1 - Shutoff valve - Google Patents
Shutoff valve Download PDFInfo
- Publication number
- US20140246105A1 US20140246105A1 US13/783,050 US201313783050A US2014246105A1 US 20140246105 A1 US20140246105 A1 US 20140246105A1 US 201313783050 A US201313783050 A US 201313783050A US 2014246105 A1 US2014246105 A1 US 2014246105A1
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- United States
- Prior art keywords
- valve
- fluid port
- fluid
- hydraulic
- flow passage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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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
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
- F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/16—Connecting or disconnecting pipe couplings or joints
- E21B19/161—Connecting or disconnecting pipe couplings or joints using a wrench or a spinner adapted to engage a circular section of pipe
- E21B19/164—Connecting or disconnecting pipe couplings or joints using a wrench or a spinner adapted to engage a circular section of pipe motor actuated
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/16—Connecting or disconnecting pipe couplings or joints
- E21B19/165—Control or monitoring arrangements therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
- F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
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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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/87249—Multiple inlet with multiple outlet
Definitions
- the Universe Machine Corporation has for many years supplied power tongs into the Canadian and United States oil field market place.
- the power tongs have a throat for receiving an oilfield tubular.
- a ring gear driven by motors engages the oilfield tubular.
- a hydraulic system supplies hydraulic power fluid to motors that drive the ring gears.
- the throat has a gate or door. Cable or hydraulic mechanisms have been used to shut off the hydraulic supply to the motors when the gate or door is opened. Cable mechanisms sold by Universe Machine Corporation have used a two piece valve shut off.
- a power tong with a cable operated door jammer valve for shutting off the hydraulic supply of a power tong when the door is opened.
- a power tong comprising a ring gear and cage assembly having a throat, the ring gear and cage assembly being driven by a motor having a hydraulic supply, a door mounted on a pivot on the ring gear and cage assembly for movement to open and close the throat, a cable secured to the door at a point that is offset from the pivot, the cable extending through a sleeve to a valve end of the cable, a valve at the valve end of the cable, the valve having a valve housing and being operable by movement of a valve control to disengage the hydraulic supply from the motor, the valve end of the cable being connected to the valve control and the sleeve being connected to the valve housing.
- a shutoff valve having a valve housing, a first fluid port in the valve housing, a second fluid port in the valve housing, a third fluid port in the valve housing, a fourth fluid port in the valve housing, and the valve being movable between first and second configurations, the first configuration allowing fluid flow between the first fluid port and the second fluid port and between the third fluid port and the fourth fluid port, the first configuration not allowing fluid flow between the first fluid port and the fourth fluid port, and the second configuration blocking flow between the first fluid port and the second fluid port and between the third fluid port and the fourth fluid port, the second fluid configuration allowing fluid flow between the first fluid port and the fourth fluid port.
- the valve may comprise a valve housing having a bore for receiving a valve spool, a valve spool movable between a first position and a second position within the bore, a first fluid port in the valve housing connected to the bore by a first flow passage within the valve housing and a second fluid port in the valve housing connected to the bore by a second flow passage within the valve housing, the valve spool being configured to allow fluid flow between the first flow passage and the second flow passage when the valve spool is in the first position, and the valve spool being configured to block fluid flow between the first flow passage and the second flow passage when the valve spool is in the second position, a third fluid port in the valve housing connected to the bore by a third flow passage within the valve housing and a fourth fluid port in the valve housing connected to the bore by a fourth flow passage within the valve housing, the valve spool being configured to allow fluid flow between the third flow passage and the fourth flow passage when the valve spool is in the first position, and the valve spool being configured to block fluid
- valve spool being configured to block fluid flow between the fifth flow passage and the sixth flow passage when the valve spool is in the first position, and the valve spool being configured to allow fluid flow between the fifth flow passage and the sixth flow passage when the valve spool is in the second position.
- the valve may have one or more of the following features: the shutoff valve may be substantially axially symmetric, the valve spool having thinner portions that allow fluid flow in the portions of the bore through which the thinner portions pass and having thicker portions that block fluid flow in the portions of the bore through which the thicker portions pass; the valve may be mounted in a hydraulic system with a hydraulic fluid source having an output line and a return line, and a hydraulic device having a input line and a drain line, in which the first fluid port is connected to the output line of the hydraulic fluid source, the second fluid port is connected to the input line of the hydraulic device, the third fluid port is connected to the drain line of the hydraulic device, and the fourth fluid port is connected to the return line of the hydraulic fluid source; the valve may be mounted in a hydraulic system with a hydraulic fluid source having an output line and a return line, and a hydraulic device having a input line and a drain line, in which the first fluid port is connected to the input line of the hydraulic device, the second fluid port is connected to the output line of the hydraulic
- FIG. 1 shows a hydraulic circuit for a power tong
- FIG. 2 shows a ring gear and cage assembly of a power tong
- FIG. 3 shows a cable operated door jammer valve for use with the ring gear and cage assembly of FIG. 2 ;
- FIG. 4A shows a shutoff valve in an open position, from a viewpoint aligned with the inputs and outputs to the valve;
- FIG. 4B shows the shutoff valve of FIG. 4A in an open position, from a viewpoint perpendicular to the inputs and outputs to the valve;
- FIG. 5A shows the shutoff valve of FIG. 4A in a closed position, from a viewpoint aligned with the inputs and outputs to the valve;
- FIG. 5B shows the shutoff valve of FIG. 4A in a closed position, from a viewpoint perpendicular to the inputs and outputs to the valve.
- a power tong 10 comprises a conventional ring gear and cage assembly 8 ( FIG. 2 ) and hydraulic power circuit 12 ( FIG. 1 ).
- the hydraulic power circuit 12 comprises a hydraulic supply 14 that supplies hydraulic fluid to motor 16 through lines 18 .
- a shut off valve 20 is provided on the lines 18 .
- the ring gear and cage assembly 8 has a throat 22 and the ring gear and cage assembly 8 is driven by the motor 16 .
- the cooperation of the ring gear and cage assembly with the motor is known in the art and need not be described further here.
- a door 24 is mounted on a pivot 26 on the ring gear and cage assembly 8 for movement to open and close the throat 22 .
- a cable 28 is secured to the door 24 at a connection point 30 that is offset from the pivot 26 .
- the cable 28 extends through a sleeve 32 to a valve end 34 of the cable 28 .
- the sleeve 32 may be secured at various points along the power tong body 10 .
- the valve 20 is located on the power tong body 10 away from the throat 22 at the rear of the ring gear and cage assembly 8 and adjacent the hydraulic supply 14 .
- the valve 20 is at the valve end 34 of the cable 28 and has a valve housing 36 .
- the valve 20 is operable by movement of a valve control 38 to disengage the hydraulic supply 14 from the motor 16 .
- the valve 20 is a conventional shut off valve in one embodiment, and may be a diverter valve in another embodiment.
- the valve end 34 of the cable 28 is connected to the valve control 38 via a rigid linkage 40 .
- the sleeve 32 is connected and secured to the valve housing 36 by any of suitable means such as by welding nut 42 to the housing 36 of the valve 20 .
- the linkage 40 through which the cable 28 is connected to the valve control 38 may comprise in one embodiment a drive rod 44 having a main section 46 lying parallel to a wall 48 of the valve housing 36 and having an extension 50 extending laterally to the main section 46 to a connection point 52 with the valve control 38 .
- connection point 30 rotates around the pivot 26 as shown by arrow B, thus pulling on the cable 28 .
- the cable 28 moves through fixed sleeve 28 and pulls on the linkage 40 , which pulls on the valve control 38 to operate the valve 20 and shut off hydraulic fluid supply to the motor 16 .
- FIGS. 4A-5B show an embodiment of the shutoff (safety interlock) valve.
- the valve spool H moves between two positions within a valve housing I, an open position shown in FIGS. 4A-4B that allows fluid to flow between port D and port E and between port F and port G, and a closed position shown in FIGS. 5A-5B that blocks fluid flow into or out of port E and into or out of port F but allows fluid flow between port D and port G. How it works is when the spool is closed the groove C connects ports D & G through the cross drilled holes A & B.
- the shutoff valve should generally be installed such that when door 24 is open the valve spool H is in the closed position and when door 24 is closed the valve spool H is in the open position.
- the valve can be installed in multiple configurations. In a typical configuration, when the valve is open oil from hydraulic supply 14 enters through port D and exits through port E to drive motor 16 . Return oil from motor 16 enters through port F and exits through port G. In this configuration, when the shutoff valve is closed, but the hydraulic supply 14 is continuing to supply fluid, inflow into port D is allowed to flow through A and B back to G thus reducing the pressure on the spool and O-rings J.
- the valve is connected so that oil from supply 14 flows into port E and out through port D to motor 16 , and returns from motor 16 through ports G and F.
- any leakage across the spool to port D will go through the cross drilled holes A & B thus eliminating any differential pressure across the ports D and G thus making it impossible to cause any device attached to ports D and G to operate.
- the Safety interlock valve can also be connected in reverse so that oil pressure is applied via ports F and G and return flow is through ports D and E.
- valve spool H is axially symmetric for ease of construction.
- the valve spool has thicker portions that block flow through the portions of the bore through which the thicker portions pass, and thinner portions such as groove C that allow flow through the portions of the bore through which the thinner portions pass.
- the portions of the bore through which the thicker portions of the valve spool pass and the portions of the bore through which the thinner portions of the valve spool pass depend on the position of the valve spool.
- the internal valve system of the safety interlock valve can provides the control valve spool seal plate damage protection.
- the primary valve motor spool
- the internal 1 ⁇ 4′′ ports soften any pressure surges in the primary valve section lessening the deformation of valve spool seal plates and likelihood of extrusion of the primary valve spools seals.
- This system is designed to mitigate pressure spikes when on operator pulls the wrong lever or bumps the lever when the door lock is activated.
- This internal hydraulic bypass can also ensure that any leakage from the primary valve (motor control valve) would not advance into the motor through the internal leakage of the door safety valve, thus negating the possibility of motor creep as well as extending motor seal life and seal plate extrusion (specifically the internally case drained Rineer motor).
- the spool could have an additional groove, and additional cross drilled holes connected to port E and port F respectively could be connected through the additional groove when the valve spool is in the closed position.
- This further embodiment would both allow any incoming fluid to flow directly to the return line, and allow equalization of pressure of any leaked oil, at the expense of increased complexity.
- the safety interlock valve can be used in conjunction with a detector for detecting a condition under which continued flow may be unsafe to shut off the flow of fluid in the event of detecting the condition.
- the detector may be configured to also operate the valve to re-enable flow in the event that the condition is not present, or may be configured, for example using a latch or other mechanism, to keep the valve in the closed position until manually reset.
- shut off valve may also be mounted so that it will stop the flow of oil from the valve which actually controls the power tong rotation. However if the tong has a multiple valve bank the other valves are not affected by this shutoff.
Abstract
A safety interlock valve with two flow passages, which in one position allows flow through the flow passages and blocks flow between them, and in another position blocks flow through the flow passages and allows flow between them. The safety interlock valve can be used in hydraulic systems such as power tongs.
Description
- Shutoff valves for hydraulic systems.
- Universe Machine Corporation has for many years supplied power tongs into the Canadian and United States oil field market place. The power tongs have a throat for receiving an oilfield tubular. A ring gear driven by motors engages the oilfield tubular. A hydraulic system supplies hydraulic power fluid to motors that drive the ring gears. To prevent the oilfield tubular exiting the throat of the power tong during use, the throat has a gate or door. Cable or hydraulic mechanisms have been used to shut off the hydraulic supply to the motors when the gate or door is opened. Cable mechanisms sold by Universe Machine Corporation have used a two piece valve shut off.
- There is provided a power tong with a cable operated door jammer valve for shutting off the hydraulic supply of a power tong when the door is opened. In an embodiment, there is provided a power tong comprising a ring gear and cage assembly having a throat, the ring gear and cage assembly being driven by a motor having a hydraulic supply, a door mounted on a pivot on the ring gear and cage assembly for movement to open and close the throat, a cable secured to the door at a point that is offset from the pivot, the cable extending through a sleeve to a valve end of the cable, a valve at the valve end of the cable, the valve having a valve housing and being operable by movement of a valve control to disengage the hydraulic supply from the motor, the valve end of the cable being connected to the valve control and the sleeve being connected to the valve housing.
- There is provided a shutoff valve having a valve housing, a first fluid port in the valve housing, a second fluid port in the valve housing, a third fluid port in the valve housing, a fourth fluid port in the valve housing, and the valve being movable between first and second configurations, the first configuration allowing fluid flow between the first fluid port and the second fluid port and between the third fluid port and the fourth fluid port, the first configuration not allowing fluid flow between the first fluid port and the fourth fluid port, and the second configuration blocking flow between the first fluid port and the second fluid port and between the third fluid port and the fourth fluid port, the second fluid configuration allowing fluid flow between the first fluid port and the fourth fluid port.
- In an embodiment, the valve may comprise a valve housing having a bore for receiving a valve spool, a valve spool movable between a first position and a second position within the bore, a first fluid port in the valve housing connected to the bore by a first flow passage within the valve housing and a second fluid port in the valve housing connected to the bore by a second flow passage within the valve housing, the valve spool being configured to allow fluid flow between the first flow passage and the second flow passage when the valve spool is in the first position, and the valve spool being configured to block fluid flow between the first flow passage and the second flow passage when the valve spool is in the second position, a third fluid port in the valve housing connected to the bore by a third flow passage within the valve housing and a fourth fluid port in the valve housing connected to the bore by a fourth flow passage within the valve housing, the valve spool being configured to allow fluid flow between the third flow passage and the fourth flow passage when the valve spool is in the first position, and the valve spool being configured to block fluid flow between the third flow passage and the fourth flow passage when the valve spool is in the second position, and the first fluid port being connected to the bore by a fifth flow passage within the valve housing, and the fourth fluid port being connected to the bore by a sixth flow passage within the valve housing. the valve spool being configured to block fluid flow between the fifth flow passage and the sixth flow passage when the valve spool is in the first position, and the valve spool being configured to allow fluid flow between the fifth flow passage and the sixth flow passage when the valve spool is in the second position.
- In further embodiments the valve may have one or more of the following features: the shutoff valve may be substantially axially symmetric, the valve spool having thinner portions that allow fluid flow in the portions of the bore through which the thinner portions pass and having thicker portions that block fluid flow in the portions of the bore through which the thicker portions pass; the valve may be mounted in a hydraulic system with a hydraulic fluid source having an output line and a return line, and a hydraulic device having a input line and a drain line, in which the first fluid port is connected to the output line of the hydraulic fluid source, the second fluid port is connected to the input line of the hydraulic device, the third fluid port is connected to the drain line of the hydraulic device, and the fourth fluid port is connected to the return line of the hydraulic fluid source; the valve may be mounted in a hydraulic system with a hydraulic fluid source having an output line and a return line, and a hydraulic device having a input line and a drain line, in which the first fluid port is connected to the input line of the hydraulic device, the second fluid port is connected to the output line of the hydraulic fluid source, the third fluid port is connected to the return line of the hydraulic fluid source, and the fourth fluid port is connected to the drain line of the hydraulic device; the shutoff valve may be mounted in a hydraulic system with a hydraulic fluid source having an output line and a return line, and a hydraulic device having a input line and a drain line, in which the first fluid port is connected to the return line of the hydraulic fluid source, the second fluid port is connected to the drain line of the hydraulic device, the third fluid port is connected to the input line of the hydraulic device, and the fourth fluid port is connected to the output line of the hydraulic fluid source; the valve may be mounted in a hydraulic system with a hydraulic fluid source having an output line and a return line, and a hydraulic device having a input line and a drain line, in which the first fluid port is connected to the drain line of the hydraulic device, the second fluid port is connected to the return line of the hydraulic fluid source, the third fluid port is connected to output line of the hydraulic fluid source, and the fourth fluid port is connected to the input line of the hydraulic device; the valve may be connected to a detector for moving the valve spool to the second position on detecting the presence of a condition, and further the detector may move the valve spool to the first position on detecting that the condition is not present; the valve may be mounted in a hydraulic system comprising power tongs; the valve may be mounted in a hydraulic system comprising a motor operating power tongs, the power tongs having a throat and a door to prevent an oilfield tubular from exiting the throat, and the valve connected to a detector for moving the valve spool to the second position on detecting the presence of the condition that the door is open, and further the detector may be a cable connected to the door.
- These and other aspects of the device are set out in the claims, which are incorporated here by reference.
- Embodiments will now be described with reference to the figures, in which like reference characters denote like elements, by way of example, and in which:
-
FIG. 1 shows a hydraulic circuit for a power tong; -
FIG. 2 shows a ring gear and cage assembly of a power tong; -
FIG. 3 shows a cable operated door jammer valve for use with the ring gear and cage assembly ofFIG. 2 ; -
FIG. 4A shows a shutoff valve in an open position, from a viewpoint aligned with the inputs and outputs to the valve; -
FIG. 4B shows the shutoff valve ofFIG. 4A in an open position, from a viewpoint perpendicular to the inputs and outputs to the valve; -
FIG. 5A shows the shutoff valve ofFIG. 4A in a closed position, from a viewpoint aligned with the inputs and outputs to the valve; and -
FIG. 5B shows the shutoff valve ofFIG. 4A in a closed position, from a viewpoint perpendicular to the inputs and outputs to the valve. - Immaterial modifications may be made to the embodiments described here without departing from what is covered by the claims. In the claims, the word “comprising” is used in its inclusive sense and does not exclude other elements being present. The indefinite article “a” before a claim feature does not exclude more than one of the feature being present. Each one of the individual features described here may be used in one or more embodiments and is not, by virtue only of being described here, to be construed as essential to all embodiments as defined by the claims.
- Referring to
FIGS. 1 and 2 , apower tong 10 comprises a conventional ring gear and cage assembly 8 (FIG. 2 ) and hydraulic power circuit 12 (FIG. 1 ). Thehydraulic power circuit 12 comprises ahydraulic supply 14 that supplies hydraulic fluid to motor 16 throughlines 18. A shut offvalve 20 is provided on thelines 18. The ring gear andcage assembly 8 has athroat 22 and the ring gear andcage assembly 8 is driven by themotor 16. The cooperation of the ring gear and cage assembly with the motor is known in the art and need not be described further here. - A
door 24 is mounted on apivot 26 on the ring gear andcage assembly 8 for movement to open and close thethroat 22. Acable 28 is secured to thedoor 24 at aconnection point 30 that is offset from thepivot 26. Thecable 28 extends through asleeve 32 to avalve end 34 of thecable 28. Thesleeve 32 may be secured at various points along thepower tong body 10. - The
valve 20 is located on thepower tong body 10 away from thethroat 22 at the rear of the ring gear andcage assembly 8 and adjacent thehydraulic supply 14. Thevalve 20 is at thevalve end 34 of thecable 28 and has avalve housing 36. Thevalve 20 is operable by movement of avalve control 38 to disengage thehydraulic supply 14 from themotor 16. Thevalve 20 is a conventional shut off valve in one embodiment, and may be a diverter valve in another embodiment. Thevalve end 34 of thecable 28 is connected to thevalve control 38 via arigid linkage 40. Thesleeve 32 is connected and secured to thevalve housing 36 by any of suitable means such as bywelding nut 42 to thehousing 36 of thevalve 20. - The
linkage 40 through which thecable 28 is connected to thevalve control 38 may comprise in one embodiment adrive rod 44 having amain section 46 lying parallel to awall 48 of thevalve housing 36 and having anextension 50 extending laterally to themain section 46 to aconnection point 52 with thevalve control 38. - When the
door 24 is opened in the direction of arrow A to open thethroat 22, theconnection point 30 rotates around thepivot 26 as shown by arrow B, thus pulling on thecable 28. Thecable 28 moves throughfixed sleeve 28 and pulls on thelinkage 40, which pulls on thevalve control 38 to operate thevalve 20 and shut off hydraulic fluid supply to themotor 16. -
FIGS. 4A-5B show an embodiment of the shutoff (safety interlock) valve. The valve spool H moves between two positions within a valve housing I, an open position shown inFIGS. 4A-4B that allows fluid to flow between port D and port E and between port F and port G, and a closed position shown inFIGS. 5A-5B that blocks fluid flow into or out of port E and into or out of port F but allows fluid flow between port D and port G. How it works is when the spool is closed the groove C connects ports D & G through the cross drilled holes A & B. As previously described, in the context of hydraulic power tongs the shutoff valve should generally be installed such that whendoor 24 is open the valve spool H is in the closed position and whendoor 24 is closed the valve spool H is in the open position. The valve can be installed in multiple configurations. In a typical configuration, when the valve is open oil fromhydraulic supply 14 enters through port D and exits through port E to drivemotor 16. Return oil frommotor 16 enters through port F and exits through port G. In this configuration, when the shutoff valve is closed, but thehydraulic supply 14 is continuing to supply fluid, inflow into port D is allowed to flow through A and B back to G thus reducing the pressure on the spool and O-rings J. It also will greatly reduce the oil from leaking across the spool from port D to E and back through F to G which further increased the effectiveness of the safety interlock valve. In another configuration, the valve is connected so that oil fromsupply 14 flows into port E and out through port D tomotor 16, and returns frommotor 16 through ports G and F. In this configuration if oil pressure is applied to port E, any leakage across the spool to port D will go through the cross drilled holes A & B thus eliminating any differential pressure across the ports D and G thus making it impossible to cause any device attached to ports D and G to operate. This allows any oil that leaks past the spool to not pass through the motor thus further reducing the chance of the motor starting to creep rotate. The Safety interlock valve can also be connected in reverse so that oil pressure is applied via ports F and G and return flow is through ports D and E. - In the embodiment shown the valve spool H is axially symmetric for ease of construction. The valve spool has thicker portions that block flow through the portions of the bore through which the thicker portions pass, and thinner portions such as groove C that allow flow through the portions of the bore through which the thinner portions pass. The portions of the bore through which the thicker portions of the valve spool pass and the portions of the bore through which the thinner portions of the valve spool pass depend on the position of the valve spool.
- The internal valve system of the safety interlock valve can provides the control valve spool seal plate damage protection. When the primary valve (motor spool) is activated and the door lock system is engaged, the internal ¼″ ports soften any pressure surges in the primary valve section lessening the deformation of valve spool seal plates and likelihood of extrusion of the primary valve spools seals. This system is designed to mitigate pressure spikes when on operator pulls the wrong lever or bumps the lever when the door lock is activated. This internal hydraulic bypass can also ensure that any leakage from the primary valve (motor control valve) would not advance into the motor through the internal leakage of the door safety valve, thus negating the possibility of motor creep as well as extending motor seal life and seal plate extrusion (specifically the internally case drained Rineer motor).
- In a further embodiment (not shown) the spool could have an additional groove, and additional cross drilled holes connected to port E and port F respectively could be connected through the additional groove when the valve spool is in the closed position. This further embodiment would both allow any incoming fluid to flow directly to the return line, and allow equalization of pressure of any leaked oil, at the expense of increased complexity.
- The safety interlock valve can be used in conjunction with a detector for detecting a condition under which continued flow may be unsafe to shut off the flow of fluid in the event of detecting the condition. Depending on the embodiment, the detector may be configured to also operate the valve to re-enable flow in the event that the condition is not present, or may be configured, for example using a latch or other mechanism, to keep the valve in the closed position until manually reset.
- In the context of hydraulic tongs the shut off valve may also be mounted so that it will stop the flow of oil from the valve which actually controls the power tong rotation. However if the tong has a multiple valve bank the other valves are not affected by this shutoff.
Claims (12)
1. A shutoff valve comprising:
a valve housing having a bore for receiving a valve spool;
a valve spool movable between a first position and a second position within the bore;
a first fluid port in the valve housing connected to the bore by a first flow passage within the valve housing and a second fluid port in the valve housing connected to the bore by a second flow passage within the valve housing, the valve spool being configured to allow fluid flow between the first flow passage and the second flow passage when the valve spool is in the first position, and the valve spool being configured to block fluid flow between the first flow passage and the second flow passage when the valve spool is in the second position;
a third fluid port in the valve housing connected to the bore by a third flow passage within the valve housing and a fourth fluid port in the valve housing connected to the bore by a fourth flow passage within the valve housing, the valve spool being configured to allow fluid flow between the third flow passage and the fourth flow passage when the valve spool is in the first position, and the valve spool being configured to block fluid flow between the third flow passage and the fourth flow passage when the valve spool is in the second position; and
the first fluid port being connected to the bore by a fifth flow passage within the valve housing, and the fourth fluid port being connected to the bore by a sixth flow passage within the valve housing. the valve spool being configured to block fluid flow between the fifth flow passage and the sixth flow passage when the valve spool is in the first position, and the valve spool being configured to allow fluid flow between the fifth flow passage and the sixth flow passage when the valve spool is in the second position.
2. The shutoff valve of claim 1 in which the valve spool is substantially axially symmetric, the valve spool having thinner portions that allow fluid flow in the portions of the bore through which the thinner portions pass and having thicker portions that block fluid flow in the portions of the bore through which the thicker portions pass.
3. The shutoff valve of claim 1 mounted in a hydraulic system with a hydraulic fluid source having an output line and a return line, and a hydraulic device having a input line and a drain line, in which the first fluid port is connected to the output line of the hydraulic fluid source, the second fluid port is connected to the input line of the hydraulic device, the third fluid port is connected to the drain line of the hydraulic device, and the fourth fluid port is connected to the return line of the hydraulic fluid source.
4. The shutoff valve of claim 1 mounted in a hydraulic system with a hydraulic fluid source having an output line and a return line, and a hydraulic device having a input line and a drain line, in which the first fluid port is connected to the input line of the hydraulic device, the second fluid port is connected to the output line of the hydraulic fluid source, the third fluid port is connected to the return line of the hydraulic fluid source, and the fourth fluid port is connected to the drain line of the hydraulic device.
5. The shutoff valve of claim 1 mounted in a hydraulic system with a hydraulic fluid source having an output line and a return line, and a hydraulic device having a input line and a drain line, in which the first fluid port is connected to the return line of the hydraulic fluid source, the second fluid port is connected to the drain line of the hydraulic device, the third fluid port is connected to the input line of the hydraulic device, and the fourth fluid port is connected to the output line of the hydraulic fluid source.
6. The shutoff valve of claim 1 mounted in a hydraulic system with a hydraulic fluid source having an output line and a return line, and a hydraulic device having a input line and a drain line, in which the first fluid port is connected to the drain line of the hydraulic device, the second fluid port is connected to the return line of the hydraulic fluid source, the third fluid port is connected to output line of the hydraulic fluid source, and the fourth fluid port is connected to the input line of the hydraulic device.
7. The shutoff valve of claim 3 in which the shutoff valve is connected to a detector for moving the valve spool to the second position on detecting the presence of a condition.
8. The shutoff valve of claim 7 in which the detector moves the valve spool to the first position on detecting that the condition is not present.
9. The shutoff valve of claim 3 in which the hydraulic system comprises power tongs.
10. The shutoff valve of claim 7 in which the hydraulic device is a motor operating power tongs, the power tongs having a throat and a door to prevent an oilfield tubular from exiting the throat, and the condition is that the door is open.
11. The shutoff valve of claim 10 in which the detector is a cable connected to the door.
12. A shutoff valve comprising:
a valve housing;
a first fluid port in the valve housing;
a second fluid port in the valve housing;
a third fluid port in the valve housing;
a fourth fluid port in the valve housing; and
the valve being movable between first and second configurations, the first configuration allowing fluid flow between the first fluid port and the second fluid port and between the third fluid port and the fourth fluid port, the first configuration not allowing fluid flow between the first fluid port and the fourth fluid port, and the second configuration blocking flow between the first fluid port and the second fluid port and between the third fluid port and the fourth fluid port, the second fluid configuration allowing fluid flow between the first fluid port and the fourth fluid port.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/783,050 US20140246105A1 (en) | 2013-03-01 | 2013-03-01 | Shutoff valve |
US16/008,405 US10988995B2 (en) | 2013-03-01 | 2018-06-14 | Shutoff valve |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/783,050 US20140246105A1 (en) | 2013-03-01 | 2013-03-01 | Shutoff valve |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/008,405 Continuation US10988995B2 (en) | 2013-03-01 | 2018-06-14 | Shutoff valve |
Publications (1)
Publication Number | Publication Date |
---|---|
US20140246105A1 true US20140246105A1 (en) | 2014-09-04 |
Family
ID=51420323
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/783,050 Abandoned US20140246105A1 (en) | 2013-03-01 | 2013-03-01 | Shutoff valve |
US16/008,405 Active US10988995B2 (en) | 2013-03-01 | 2018-06-14 | Shutoff valve |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/008,405 Active US10988995B2 (en) | 2013-03-01 | 2018-06-14 | Shutoff valve |
Country Status (1)
Country | Link |
---|---|
US (2) | US20140246105A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150247577A1 (en) * | 2014-03-03 | 2015-09-03 | Idea Logic LLC | Diverter valve cartridge plate |
US20170030154A1 (en) * | 2015-07-30 | 2017-02-02 | Pentacle Oilfield Supply Inc. | Double-door gating safety protection device for a hydraulic power tong |
US20180141586A1 (en) * | 2015-05-29 | 2018-05-24 | Saf-Holland Gmbh | Cylinder unit |
US20180163878A1 (en) * | 2015-02-03 | 2018-06-14 | Ogon Contracting Pty Ltd | Safety valve for a hydraulic or pneumatic tool |
US11516961B2 (en) | 2019-07-17 | 2022-12-06 | Cnh Industrial America Llc | Agricultural product metering motor creep control |
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US1716881A (en) * | 1926-10-09 | 1929-06-11 | Waterbury Tool Co | Reversing valve |
US1775856A (en) * | 1929-05-24 | 1930-09-16 | Albert B Hauser | Four-way valve |
US2831466A (en) * | 1955-03-28 | 1958-04-22 | Deere & Co | Fluid pressure system with recirculating circuit |
US3797967A (en) * | 1972-05-10 | 1974-03-19 | D Howeth | Hydraulic throttle actuator |
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US4644657A (en) * | 1982-11-11 | 1987-02-24 | Heide Hans Von Der | Speed-controlled apparatus for cutting and taking out blocks from a silo fodder bin |
US5740702A (en) * | 1996-07-29 | 1998-04-21 | Ingersoll-Rand Company | Device for spinning drill pipe in a drill rig |
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150247577A1 (en) * | 2014-03-03 | 2015-09-03 | Idea Logic LLC | Diverter valve cartridge plate |
US20180163878A1 (en) * | 2015-02-03 | 2018-06-14 | Ogon Contracting Pty Ltd | Safety valve for a hydraulic or pneumatic tool |
US10571032B2 (en) * | 2015-02-03 | 2020-02-25 | Ogon Contracting Pty Ltd. | Safety valve for a hydraulic or pneumatic tool |
US11112018B2 (en) | 2015-02-03 | 2021-09-07 | Ogon Contracting Pty Ltd. | Safety valve for hydraulic or pneumatic tool |
US11940054B2 (en) | 2015-02-03 | 2024-03-26 | Ogon Contracting Pty Ltd. | Safety valve for hydraulic or pneumatic tool |
US20180141586A1 (en) * | 2015-05-29 | 2018-05-24 | Saf-Holland Gmbh | Cylinder unit |
US20170030154A1 (en) * | 2015-07-30 | 2017-02-02 | Pentacle Oilfield Supply Inc. | Double-door gating safety protection device for a hydraulic power tong |
US11516961B2 (en) | 2019-07-17 | 2022-12-06 | Cnh Industrial America Llc | Agricultural product metering motor creep control |
Also Published As
Publication number | Publication date |
---|---|
US10988995B2 (en) | 2021-04-27 |
US20190063627A1 (en) | 2019-02-28 |
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Legal Events
Date | Code | Title | Description |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |