GB2430993A - Butterfly valve with bypass system - Google Patents

Butterfly valve with bypass system Download PDF

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Publication number
GB2430993A
GB2430993A GB0520584A GB0520584A GB2430993A GB 2430993 A GB2430993 A GB 2430993A GB 0520584 A GB0520584 A GB 0520584A GB 0520584 A GB0520584 A GB 0520584A GB 2430993 A GB2430993 A GB 2430993A
Authority
GB
United Kingdom
Prior art keywords
valve
bypass
spindle
outlet
inlet
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.)
Withdrawn
Application number
GB0520584A
Other versions
GB0520584D0 (en
Inventor
Ellis Peter Hunter Rowe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GT GROUP Ltd
Original Assignee
GT GROUP Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by GT GROUP Ltd filed Critical GT GROUP Ltd
Priority to GB0520584A priority Critical patent/GB2430993A/en
Publication of GB0520584D0 publication Critical patent/GB0520584D0/en
Publication of GB2430993A publication Critical patent/GB2430993A/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • F16K1/223—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves with a plurality of valve members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
    • F02D9/06—Exhaust brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/1035—Details of the valve housing
    • F02D9/1055—Details of the valve housing having a fluid by-pass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/1035—Details of the valve housing
    • F02D9/106—Sealing of the valve shaft in the housing, e.g. details of the bearings
    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/52—Means for additional adjustment of the rate of flow
    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/54—Arrangements for modifying the way in which the rate of flow varies during the actuation of the valve

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fluid-Driven Valves (AREA)
  • Lift Valve (AREA)

Abstract

An exhaust brake butterfly valve 10, the valve 10 having a valve body 12 an inlet 26 an outlet 28, a conduit 13 between the inlet 26 and outlet 28, a butterfly element 14 mounted to a spindle 16 and a bypass arrangement (20 Figure 1) which permits limited fluid communication through the butterfly element when the butterfly element is in a closed position. The spindle 16 and the butterfly element 14 are positioned in the conduit 13 and movable between an open position where the inlet 26 is in communication with the outlet 28 and the closed position where communication is prevented. The bypass arrangement (20) may comprise a conduit 52 extending through the spindle and butterfly element. Preferably a control system operates the bypass arrangement to maintain a desired back pressure.

Description

I
P714119GB Flow Control Valve The present invention relates to a flow control valve and particularly to a butterfly type flow control valve.
A butterfly valve may be used to control the flow of fluid through a conduit such as a pipe or tube. The valve includes a flap element, commonly referred to as the butterfly, which is mounted on a spindle. The butterfly is rotatable between a closed position where it lies substantially across the conduit, thereby preventing fluid flow, and an open position where it is aligned edge on with the direction of fluid flow, thereby permitting fluid flow through the conduit. It will be appreciated that in the closed position the butterfly generates a back pressure on its upstream side. In certain applications it is necessary to modulate the back pressure such that it is maintained at or near a predetermined value.
According to the present invention there is provided a butterfly valve, the valve including a valve body having an inlet, and outlet and a conduit therebetween, a butterfly element and a spindle, the spindle and butterfly element being positioned in the conduit and movable between an open position wherein the inlet is in fluid communication with the outlet, and a closed position wherein fluid communication between the in let and outlet is substantially prevented, the valve further including a bypass arrangement operable to permit limited fluid communication across the butterfly element when the element is in the closed position.
The provision of the bypass arrangement enables a desired back pressure to be maintained upstream of the butterfly element when it is in the closed position.
The bypass arrangement includes a conduit extending from the upstream side to the downstream side of the butterfly element. The conduit may extend through the butterfly element. In a preferred embodiment, the conduit extends through the butterfly element and the spindle. The conduit comprises an inlet, an outlet and a fluid communication path therebetween. The inlet may be defined by aligned apertures of the butterfly element and spindle. The outlet may also be defined by aligned apertures of the butterfly element and spindle. The communication path between the inlet and outlet may be defined bay an aperture or recess of the spindle. The inlet and outlet may be aligned along a common axis. Alternatively, the inlet and outlet may be aligned along different axes. For example, the inlet and outlet may be aligned along substantially parallel axes.
The bypass arrangement preferably also includes a blocking member positioned so as to selectively open and close the conduit. The blocking member is movable between an open position wherein the fluid is able to pass from the inlet to the outlet and a closed position where fluid is prevented from passing from the inlet to the outlet. Preferably the blocking member is movable to an intermediate position wherein flow from the inlet to the outlet is restricted.
The blocking member is preferably provided in the conduit between the inlet and the outlet. In a preferred embodiment the blocking member is provided in the aperture or recess of the spindle. The blocking member may be movable in a direction substantially parallel with the longitudinal axis of the spindle. The blocking member may take the form of a piston which is slidably movable within the spindle. In an alternative embodiment the blocking member may be rotatable within the spindle.
Movement of the butterfly element between the open and closed positions may be achieved by the provision of an actuator. The actuator may be mounted to the valve body. Alternatively, the actuator may be mounted remote from the valve body and connected to the butterfly element by an appropriate linkage. Movement of the blocking member between the open and closed positions may be achieved by the provision of an actuator. The actuator may be mounted to the valve body.
Alternatively, the actuator may be mounted remote from the valve body and connected to the blocking member by an appropriate linkage.
The valve is preferably also provided with a control system including a sensor positioned upstream of the butterfly element and arranged to measure fluid pressure.
The system is arranged to operate the blocking element actuator to maintain a desired back pressure upstream of the butterfly valve.
An embodiment of the present invention will now be described with reference to the accompanying drawings in which: Figure 1 shows a partially sectioned perspective view of a butterfly valve according to the present invention; Figure 2 shows a cross-sectional view of the valve with the butterfly in a closed position; Figure 3 shows a cross-sectional view of the valve with the butterfly in an open position; Figure 4 shows a cross-sectional view of the valve with the butterfly in a closed position and a bypass arrangement in an open position; Figure 5 shows a cross-sectional view of the valve with the butterfly in a closed position and a bypass arrangement in a partially closed position; Figure 6 shows a cross-sectional view of the valve with the butterfly in a closed position and a bypass arrangement in a fully closed position; and Figure 7 shows a graph of back pressure against flow rate for a butterfly valve according to the present invention.
Referring firstly to figures 1 to 6 there is shown a butterfly valve, generally designated 10, according to the present invention. The valve 10 includes a valve body 12, a butterfly element 14, a spindle 16 and a butterfly actuator 18. The valve 10 further includes a bypass arrangement generally designated 20 which will be described in greater detail below.
The body 12 comprises a cylindrical conduit 13 having an upstream side 22 and a downstream side 24. The upstream side 22 is provided with an inlet 26 and the downstream side 24 with an outlet 28. The inlet and outlet 26, 28 are provided with respective exterior flanges 30,32 to permit the valve 10 to be mounted to respective upstream and down stream flow conduits (not shown). The outlet flange 32 is substantially square and provided with a plurality of through apertures 34 through which appropriate fixing means may extend, in use. Between the inlet and outlet 26,28 the body 12 is provided with opposed pillars 36 which are utilised to mount the spindle 16, the butterfly element 14 and butterfly actuator 18.
The butterfly element 14 is substantially disc shaped and comprises a central sleeve portion 38 having laterally extending wing portions 40 on opposing sides thereof. The spindle 16 extends through the sleeve portion 38 and is rotationally fixed thereto.
Opposing ends 42,44 of the spindle 16 are mounted for rotation in respective cylindrical bushes 46. Each bush 46 is located in an aperture of a pillar 36. One end 42 of the spindle 16 extends beyond its bush 46 and pillar 36 and is connected to the actuator 18.
The actuator 18 includes an extendable ram 48 which is connected to the spindle end 42 via a crank arrangement 50. In the embodiment shown the actuator 18 is mounted to a plate 52 which in turn is mounted to a pillar 36 of the valve body 12. In the embodiment shown the actuator 18 is of the pneumatic type. It will be understood that other types of actuator may be utilised including, for example, hydraulic and servo-electric type actuators.
The actuator 18 is operable to extend and retract the ram 48. Movement of the ram 48 is converted via the crank arrangement 50 into rotation of the spindle 16. It will thus be appreciated that the butterfly element 14 is movable between the closed position shown in figure 2 and the open position shown in figure 3.
As noted above, the valve 10 includes a bypass arrangement 20. The bypass arrangement is operable to permit fluid flow from the upstream side to the downstream side of the butterfly element 14 when the element 14 is in the closed position. As can be seen from figures 3 to 6, the end 44 of the spindle 16 opposite to that to which the actuator 18 is connected is provided with an internal recess 52 which extends in the longitudinal direction of the spindle 16. The recess 52 extends from the end 44 of the spindle 16 to a position which corresponds substantially to the midway point of the butterfly element 14. The recess 52 is provided with an inlet aperture 54 and an outlet aperture 56, both of which are located within the cylindrical conduit 13 of the body.
The apertures 54,56 are aligned with respective inlet and outlet apertures 58,60 provided in the sleeve portion 38 of the butterfly element 14. The inlet apertures 54,58 are positioned on the upstream side of the element 14, while the outlet apertures 56,60 are positioned on the downstream side. It will be understood that the apertures 54,56,58,60 and recess 52 co-operate to define a flow path through the butterfly element 14 as illustrated by arrow 62 in figure 4.
The bypass arrangement 20 further includes a piston member 64 which is mounted within the spindle recess 52. The piston member 64 is movable in the longitudinal direction of the recess 52 as indicated by arrow 66. The piston member 64 is movable between an open position where the outlet apertures 56,60 are unobstructed (figure 4) and a closed position where the outlet apertures 56,60 are closed (figure 6), via an intermediate position (figure 5) where the outlet apertures 56,60 are partially closed. It will thus be appreciated that the piston member 64 is movable so as to both open and close the flow path through the butterfly element 14 and to vary the flow rate therethrough between the open and closed positions. The piston member 64 is provided with an attachment portion 68 at its outer end to permit attachment to an appropriately configured actuator (not shown). The piston member 64 may be directly connected to an actuator or, alternatively, the piston member may be connected to a remote actuator via an appropriate linkage. The actuator may be of the pneumatic, hydraulic or servo-electric type. Controlled back pressure of the fluid within the conduit to which the valve 10 is mounted may also be utilised to move the piston member 64.
In use, the bypass arrangement 20 is operable to maintain a predetermined back pressure upstream of the butterfly element 14 when the element 14 is in the closed position. When the butterfly element 14 moves from the open to the closed position it will be understood that pressure will increase on the upstream side of the element 14.
Figure 7 shows a graph of back pressure against flow rate for a valve 10 according to the present invention where the butterfly element 14 is in the closed position and the piston member 64 is initially in the closed position. As the flow rate increases from zero to value A, the back pressure rises linearly to value X. Value X corresponds to a maximum allowable back pressure. As the flow rate increases from value A towards value B, the piston member 64 is caused to move from the closed position towards the open position, thereby opening the flow path through the butterfly element 14. Fluid is thus permitted to flow from the upstream side to the downstream side of the butterfly element thereby maintaining the back pressure at value X. If the flow rate subsequently decreases towards value A, then the piston member moves towards the closed position to reduce the flow rate of fluid through the butterfly element 14.
Control of the movement of the piston member 64 is achieved via a feedback ioop which is sensitive to the pressure upstream of the butterfly element. The feedback loop can also be used to negate any potential hysterisis losses that might be caused by relative movements of system components and any associated frictional losses.
The valve 10 of the present invention is compatible with a variety of fluids including both gasses and liquids. The fluids and gasses can range from high temperature corrosive exhaust gasses having temperatures in region of 800 degrees Centigrade, to low temperature cryogenic liquids such as liquid CO2 at cryogenic temperatures of minus 600 degrees Centigrade.

Claims (17)

  1. Claims 1. An exhaust brake butterfly valve, the valve including a valve
    body having an inlet, an outlet and a conduit therebetween, and a butterfly element mounted to a spindle, the spindle and butterfly element being positioned in the conduit and movable between an open position wherein the inlet is in fluid communication with the outlet, and a closed position wherein fluid communication between the in let and outlet is substantially prevented, the valve further including a bypass arrangement operable to permit limited fluid communication through the butterfly element when the butterfly element is in the closed position.
  2. 2. A valve as claimed in claim 1 wherein the bypass arrangement includes a bypass conduit extending through the butterfly element and the spindle, the bypass conduit having a bypass inlet, a bypass outlet and a bypass fluid communication path therebetween.
  3. 3. A valve as claimed in claim 2 wherein the bypass inlet is defined by aligned apertures of the butterfly element and spindle.
  4. 4. A valve as claimed in claim 2 or claim 3 wherein the bypass outlet is defined by aligned apertures of the butterfly element and spindle.
  5. 5. A valve as claimed in any of claims 2 to 4 wherein the bypass communication path between the bypass inlet and bypass outlet is defined by an aperture of the spindle.
  6. 6. A valve as claimed in claim 5 wherein the aperture is aligned with the longitudinal axis of the spindle.
  7. 7. A valve as claimed in any of claims 2 to 6 wherein the bypass inlet and bypass outlet are aligned along a common axis.
  8. 8. A valve as claimed in any of claims 2 to 6 wherein the bypass inlet and bypass outlet are aligned along substantially parallel axes.
  9. 9. A valve as claimed in any of claims 2 to 8 wherein the bypass arrangement includes a blocking member positioned so as to selectively open and close the bypass conduit.
  10. 10. A valve as claimed in claim 9 wherein the blocking member is movable between an open position wherein the fluid is able to pass from the bypass inlet to the bypass outlet and a closed position where fluid is prevented from passing from the bypass inlet to the bypass outlet via an intermediate position wherein flow from the bypass inlet to the bypass outlet is restricted.
  11. 11. A valve as claimed in claim 9 or claim 10 wherein the blocking member is provided in the bypass conduit between the bypass inlet and the bypass outlet.
  12. 12. A valve as claimed in any of claims 9 to 11 wherein the blocking member is movable in a direction substantially parallel with the longitudinal axis of the spindle.
  13. 13. A valve as claimed in any of claims 9 to 12 wherein the blocking member is in the form of a piston which is slidably movable within the spindle.
  14. 14. A valve as claimed in any of claims 9 to 12 wherein the blocking member is rotatable within the spindle.
  15. 15. A valve as claimed in any of claims 9 to 14 wherein the valve further includes blocking member actuator operable to move the blocking member.
  16. 16. A valve as claimed in any preceding claim wherein the valve further includes a butterfly actuator operable to move the butterfly element between the open and closed positions.
  17. 17. A valve as claimed in any preceding claim wherein the valve is provided with a control system including a sensor positioned upstream of the butterfly element and arranged to measure fluid pressure, the control system being arranged to operate the bypass arrangement to maintain a desired back pressure upstream of the butterfly element.
GB0520584A 2005-10-10 2005-10-10 Butterfly valve with bypass system Withdrawn GB2430993A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0520584A GB2430993A (en) 2005-10-10 2005-10-10 Butterfly valve with bypass system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0520584A GB2430993A (en) 2005-10-10 2005-10-10 Butterfly valve with bypass system

Publications (2)

Publication Number Publication Date
GB0520584D0 GB0520584D0 (en) 2005-11-16
GB2430993A true GB2430993A (en) 2007-04-11

Family

ID=35430123

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0520584A Withdrawn GB2430993A (en) 2005-10-10 2005-10-10 Butterfly valve with bypass system

Country Status (1)

Country Link
GB (1) GB2430993A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2441588A (en) * 2006-09-06 2008-03-12 Gt Group Ltd Butterfly valve
EP2440765A1 (en) * 2009-06-12 2012-04-18 Jacobs Vehicle Systems, Inc. Exhaust brake
EP3754123A1 (en) * 2019-06-21 2020-12-23 Kohler India Corporation Private Limited Trapway arrangement for toilet systems

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5590764A (en) * 1978-12-27 1980-07-09 Fuji Electric Co Ltd Inlet valve for hydraulic machine
US4408581A (en) * 1980-10-24 1983-10-11 Vdo Adolf Schindling Ag Device for controlling the speed of travel and regulating the idling speed of automotive vehicles with an Otto engine
US4580603A (en) * 1984-01-27 1986-04-08 Unima Maschinenbau Gmbh Shutoff valve with a flap member
FR2616873A1 (en) * 1987-06-16 1988-12-23 Peugeot Device for the flow of a fluid in a duct which can be closed off by a flap or butterfly
WO1996035866A2 (en) * 1995-05-09 1996-11-14 Filterwerk Mann & Hummel Gmbh Throttle valve for regulating the amount of intake air in an internal combustion engine and process for producing the same
US20030192595A1 (en) * 2002-04-10 2003-10-16 Benson Dwayne M. Flow control valve with integral sensor and controller and related method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5590764A (en) * 1978-12-27 1980-07-09 Fuji Electric Co Ltd Inlet valve for hydraulic machine
US4408581A (en) * 1980-10-24 1983-10-11 Vdo Adolf Schindling Ag Device for controlling the speed of travel and regulating the idling speed of automotive vehicles with an Otto engine
US4580603A (en) * 1984-01-27 1986-04-08 Unima Maschinenbau Gmbh Shutoff valve with a flap member
FR2616873A1 (en) * 1987-06-16 1988-12-23 Peugeot Device for the flow of a fluid in a duct which can be closed off by a flap or butterfly
WO1996035866A2 (en) * 1995-05-09 1996-11-14 Filterwerk Mann & Hummel Gmbh Throttle valve for regulating the amount of intake air in an internal combustion engine and process for producing the same
US20030192595A1 (en) * 2002-04-10 2003-10-16 Benson Dwayne M. Flow control valve with integral sensor and controller and related method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2441588A (en) * 2006-09-06 2008-03-12 Gt Group Ltd Butterfly valve
GB2441588B (en) * 2006-09-06 2011-02-23 Gt Group Ltd Improved butterfly valve
EP2440765A1 (en) * 2009-06-12 2012-04-18 Jacobs Vehicle Systems, Inc. Exhaust brake
CN102803683A (en) * 2009-06-12 2012-11-28 雅各布斯车辆系统公司 Exhaust brake
EP2440765A4 (en) * 2009-06-12 2013-11-06 Jacobs Vehicle Systems Inc Exhaust brake
EP3754123A1 (en) * 2019-06-21 2020-12-23 Kohler India Corporation Private Limited Trapway arrangement for toilet systems

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Publication number Publication date
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