GB2143304A - Directional control valve unit - Google Patents

Directional control valve unit Download PDF

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Publication number
GB2143304A
GB2143304A GB08413934A GB8413934A GB2143304A GB 2143304 A GB2143304 A GB 2143304A GB 08413934 A GB08413934 A GB 08413934A GB 8413934 A GB8413934 A GB 8413934A GB 2143304 A GB2143304 A GB 2143304A
Authority
GB
United Kingdom
Prior art keywords
valve
pump
directional control
hydraulic
valve body
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.)
Granted
Application number
GB08413934A
Other versions
GB8413934D0 (en
GB2143304B (en
Inventor
Jun Maruyama
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.)
Komatsu Ltd
Original Assignee
Komatsu 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 Komatsu Ltd filed Critical Komatsu Ltd
Publication of GB8413934D0 publication Critical patent/GB8413934D0/en
Publication of GB2143304A publication Critical patent/GB2143304A/en
Application granted granted Critical
Publication of GB2143304B publication Critical patent/GB2143304B/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/08—Assemblies of units, each for the control of a single servomotor only
    • F15B13/0803—Modular units
    • F15B13/0821—Attachment or sealing of modular units to each other
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • 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
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/08—Assemblies of units, each for the control of a single servomotor only
    • F15B13/0803—Modular units
    • F15B13/0832—Modular valves
    • F15B13/0839—Stacked plate type valves
    • 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
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/08—Assemblies of units, each for the control of a single servomotor only
    • F15B13/0803—Modular units
    • F15B13/0832—Modular valves
    • F15B13/0842—Monoblock type valves, e.g. with multiple valve spools in a common housing
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F15B2211/31582—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having multiple pressure sources and a single output member

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Servomotors (AREA)
  • Multiple-Way Valves (AREA)

Abstract

A directional control valve unit for controlling the supply of hydraulic fluid under pressure from at least two hydraulic pumps (P1, P2) to an actuator, comprises a valve body (10, 15) which houses, for each pump, a valve spool (13, 18) for porting the hydraulic fluid under pressure from that pump selectively to an associated first (12, 17) or second (11, 16) hydraulic chamber in the valve body, the first chambers (12, 17) of the different valve spools communicating via a first communication passage (120) within the valve body with one another and with an actuator head side outlet port (5), and the second chambers (13 18) of the different valve spools communicating via a second communication passage (110) within the valve body with one another and with an actuator bottom side outlet port (4). <IMAGE>

Description

SPECIFICATION Directional control valve unit The invention relates to directional control valve units for controlling the supply of fluid under pressure from a plurality of hydraulic pumps to an actuator.
There has been proposed an arrangement for supplying fluid under pressure from a plurality of pumps to an actuator whereby fluid under pressure is delivered by each pump through an associated control valve to the actuator. Such an arrangement is disadvantageous in that first and second ports of each valve have to be connected by flexible conduits to the actuator, which results in an undesirably large number of conduits and connections each with its associated risk of oil leakage.
The invention provides a directional control valve unit for controlling the supply of hydraulic fluid under pressure from at least two hydraulic pumps to an actuator, comprising a valve body which houses, for each pump, a valve spool for porting the hydraulic fluid under pressure from that pump selectively to an associated first or second hydraulic chamber in the valve body, the first chambers of the different valve spools communicating via a first communication passage within the valve body with one another and with an actuator head side outlet port, and the second chambers of the different valve spools communicating via a second communication passage within the valve body with one another and with an actuator bottom side outlet port.The directional control valve unit of the invention effectively combines a plurality of directional control valves (the valve spools) in a single valve body, with their respective internal passages being joined to one another inside the valve body.
Advantageously a check valve in the first or second communication passage between adjacent first or adjacent second chambers, for preventing the reverse flow of fluid under pressure from that side of the actuator on which a load due to gravity is applied.
Drawings: Figure 1 is a perspective view of a directional control according to the invention; Figure 2 is a vertical side view of the directional control valve unit looking in the direction of arrow II in Figure 1; Figure 3 is a cross-sectional view of the directional control valve unit of Figures 1 and 2; Figures 4 and 5 are sectional views taken along lines IV-IV and V-V, respectively, of Figure 3; Figure 6 is a perspective view of another directional control valve unit according to the invention; Figure 7 is a vertical side view of the direction control valve unit looking in the direction of arrow VII in Figure 6; Figure 8 is a cross-sectional view of the second directional control valve unit of Figures 6 and 7; Figures 9 and 10 are sectional views taken along lines lX4XandX-X, respectively, of Figure 8; and Figure 11 is a circuit diagram of a typical hydraulic circuit in which a directional control valve according to the invention is incorporated.
Referring first to the embodiment of Figures 1 to 5, passages 1a and ib for the fluid under pressure delivered by first and second hydraulic pumpa P1 and P2 are connected with inlet ports 2 and 3 of first and second valves V1 and V2, respectively. First and second outlet ports 4 and 5 formed in the first valve V1 are connected through first and second pipings 6 and 7, respectively, to the bottom side and head side respectively of an actuator A. The first and second valves V1 and V2 are connected together as an integral unit by means of bolts 8. The first valve V1 has a drain port 9 that is connected with a reservoir T.
Slidably mounted in the valve body 10 of the first valve V1 are spools 13 and 14 (Figures 3, 4) for causing the inlet port 2 to be connected to and disconnected from first and second passages 11 and 12, respectively. Further, slidably fitted in the like manner in the valve body 15 of the second valve V2 are spools 18 and 19 for causing the inlet port 3 to be connected to and disconnected from third and fourth passages 16 and 17, respectively. The third passage 16 is connected through a check valve 20 with the first passage 11, whilst the fourth passage 17 is connected directly with the second passage 12. The first and second passages 11 and 12 are connected with the first and second ports 4 and 5, respectively.
Further, the valve body 10 has first drain passages 21 and 22 (Figure 5) formed therein so as to communicate with a first head side drain port DpH1 and a first bottom side drain port DpB1, respectively. Similarly, the valve body 15 has second drain passages (not shown) formed therein so as to communicate with a second head side drain port DpH2 and a second bottom side drain port DpB2, respectively. The first drain passages 21 and 22 are interconnected on to the other, and the second drain passages are similarly interconnected one to the other, all being also connected to the drain port 9.
The connections between the first and second hydraulic pumps P1 and P2 and the ports of the first and second control valves V1 and V2 is best described with particular reference to Figures 1 and 3.
The fluid under pressure supplied by the first pump P1 passes through the delivery passage 1a, and then through the inlet port 2 of the first valve V1 into first pumping ports Ppi and P'p. Also the pressurized fluid flows through a check valve C1 in the first pumping port P'p, into first intermediate ports Mpi and M'p, formed one on each side of the first pumping port Pp. The first valve spools 13 and 14 are slidably mounted to span the first intermediate ports Mp, and M'pi. With the movement of the valve spools 13 and 14, the first intermediate port Mp, may be connected with the first head side supply port Spin, or the first intermediate port M'pi may be connected with the first bottom side supply port SpB, so that the fluid under pressure from the first pump P1 may be supplied to either side of the actuator A. The first head side supply port SpH, and the first bottom side supply port SpBi constitute first and second hydraulic chambers in the valve body.
Similarly, the fluid under pressure supplied by the second hydraulic pump P2 passes through the delivery passage 1b and then through the inlet port 3 of the second valve V2 into second pumping ports Pp2 and P'p2. Also the pressurized fluid flows through a a check valve C2 in the second pumping port P'p2 into second intermediate ports Mp2 and M'p2 formed one on each side of the second pumping port Pp2. The second valve spools 18 and 19 are slidably mounted to span the second intermediate ports Mp2 and M'p2.
With the movement of th second valve spools 18 and 19, the second intermediate port Mp2 may be connected with the second head side supply port SpH2, or the second intermediate port M'p2 may be connected with the second bottom side supply port I SpB2. The second head side supply port SpH2 and the second bottom side supply port SpB2 constitute further first and second hydraulic chambers in the valve body.
The two first hydraulic chambers and the two second hydraulic chambers are connected by com munication passages within the valve body. Thus the first head side supply port SpH, is connected through a communication passage 110 with the second head side supply port SpH2, whilst the first bottom side supply port SpB, is connected through a communication passage 120 with the second bottom side supply port SpB2, so that the pressurized fluid from the second hydraulic pump P2 may be supplied to either side of the actuator A.
One example of a circuit diagram utilizing the directional control valve according to the present invention shown in Figure 11.
The fluid under pressure delivered by the first hydraulic pump P1 is supplied (through the first i passage 11 or the second passage 12 as described with reference to Figures 1 to 5) to the first outlet port 4 or the second outlet port 5, whilst the fluid under pressure delivered by the second hydraulic pump P2 is supplied (through the third passage 16 or I the fourth passage 17 and through the first passage 11 or the second passage 12 as described with reference to Figures 1 to 5) to the first outlet port 4 or the second outlet ports.
Figure 6 to 10 illustrate a second embodiment of the invention but utilize the same reference letters and numerals or simply omit the references for the same or analogous parts as those described above for Figures 1 to 5. it will be appreciated from Figures 8, 9 and 10 that a block 30 is mounted on the valve bodies 10 and 15. The block 30 has spools 14 and 15 slidably mounted therein, and also has the first and second ports 4 and 5, and fifth and sixth passages 31 and 32 formed therein, the fifth passage 31 having a check valve 33 installed therein.

Claims (7)

1. A directional valve unit for controlling the supply of hydraulic fluid under pressure from at least I two hydraulic pumps to an actuator, comprising a valve body which houses, for each pump, a valve spool for porting the hudraulicfluid under pressure from that pump selectively to an associated first or second hydraulic chamber in the valve body, the first chambers of the different valve spools communicating via a first communication passage within the valve body with one another and with an actuator head side outlet port, and the second chambers of the different valve spools communicating via a second communication passage within the valve body with one another and with an actuator bottom side outlet port.
2. A directional control valve according to claim 1 comprising, for each pump, a pump inlet chamber leading to a pair of intermediate port each of which in use receives fluid under pressure from that pump; and the valve spool for each pump spans the intermediate ports for selectively porting hydraulic fluid from one of the intermediate ports to its first hydraulic chamber or from the other of the intermediate ports to its second hydraulic chamber.
3. A directional control valve according to claim 1 or claim 2, further comprising a one-way valve in the first or second communication passage between adjacent first or adjacent second chambers.
4. A directional control valve according to any preceding claim, wherein the valve body has a single drain port and the valve spools selectively connect each of the outlet ports with the drain port when the other of the outlet ports is connected with the associated hydraulic pump.
5. A directional control valve according to any preceding claim, further comprising, in the same valve body, a similar set of valve spools, chambers and passages for another actuator, with a single pump inlet for each pump leading to pump inlet chambers for the associated valve spools.
6. A directional control valve for controlling the supply of hydraulic fluid under pressure from either of a pair of hydraulic pumps to either of two actuators, substantially as described herein with reference to Figures 1 to 5 of the drawings.
7. A directional control valve for controlling the supply of hydraulic fluid under pressure from either of a pair of hydraulic pumps to either of two actuators, substantially as described herein with reference to Figures 1 to 5 as modified by Figures 6 to 10 of the drawings.
GB08413934A 1983-05-31 1984-05-31 Directional control valve unit Expired GB2143304B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8104683U JPS59186502U (en) 1983-05-31 1983-05-31 directional valve

Publications (3)

Publication Number Publication Date
GB8413934D0 GB8413934D0 (en) 1984-07-04
GB2143304A true GB2143304A (en) 1985-02-06
GB2143304B GB2143304B (en) 1986-07-02

Family

ID=13735478

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08413934A Expired GB2143304B (en) 1983-05-31 1984-05-31 Directional control valve unit

Country Status (3)

Country Link
JP (1) JPS59186502U (en)
DE (1) DE3420356A1 (en)
GB (1) GB2143304B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7225832B2 (en) * 2004-09-01 2007-06-05 Phoenix Precision Five valve manifold with angle bonnet details
GB2503279A (en) * 2012-06-22 2013-12-25 Kohler Mira Ltd Mixer valve
WO2013190381A1 (en) * 2012-06-22 2013-12-27 Kohler Mira Limited Improvements in and relating to valves
EP2778485A1 (en) * 2013-03-13 2014-09-17 Kohler Mira Limited Valve
US9182047B2 (en) 2013-03-13 2015-11-10 Kohler Mira Limited Valve with fail-safe device
EP3361105A4 (en) * 2015-10-08 2019-05-15 Volvo Construction Equipment AB Spool valve
US11391021B2 (en) 2017-11-09 2022-07-19 Kohler Mira Limited Plumbing component

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0752454Y2 (en) * 1989-02-13 1995-11-29 東芝機械株式会社 Control valve device
JP2544786Y2 (en) * 1990-05-29 1997-08-20 株式会社小松製作所 Operating valve device
JP2006009940A (en) * 2004-06-25 2006-01-12 Komatsu Ltd Directional control valve
JP2012047307A (en) * 2010-08-30 2012-03-08 Kyb Co Ltd Selector valve
JP2013249897A (en) * 2012-05-31 2013-12-12 Hitachi Constr Mach Co Ltd Multiple valve device

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GB1413689A (en) * 1971-12-13 1975-11-12 Caterpillar Tractor Co Control vavles
GB2019614A (en) * 1978-04-19 1979-10-31 Caterpillar Tractor Co Hydraulic system with selectively connectable pumps
EP0066362A2 (en) * 1981-05-22 1982-12-08 Caterpillar Tractor Co. Fluid control system
EP0070005A1 (en) * 1981-07-10 1983-01-19 Hitachi Construction Machinery Co., Ltd. Hydraulic fluid circuit of hydraulic shovel

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DD88734A (en) *
JPS5833281Y2 (en) * 1973-10-13 1983-07-25 株式会社クボタ 2 Pump Kudugata Yuatsusagiyoukiniokel Yuatsu Cairo
JPS56159438U (en) * 1980-04-24 1981-11-27
JPS5751006A (en) * 1980-09-08 1982-03-25 Toshiba Mach Co Ltd Composite control valve for conflluence

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1413689A (en) * 1971-12-13 1975-11-12 Caterpillar Tractor Co Control vavles
GB2019614A (en) * 1978-04-19 1979-10-31 Caterpillar Tractor Co Hydraulic system with selectively connectable pumps
EP0066362A2 (en) * 1981-05-22 1982-12-08 Caterpillar Tractor Co. Fluid control system
EP0070005A1 (en) * 1981-07-10 1983-01-19 Hitachi Construction Machinery Co., Ltd. Hydraulic fluid circuit of hydraulic shovel

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7225832B2 (en) * 2004-09-01 2007-06-05 Phoenix Precision Five valve manifold with angle bonnet details
US9689149B2 (en) 2012-06-22 2017-06-27 Kohler Mira Limited Flow control valve
US9340958B2 (en) 2012-06-22 2016-05-17 Kohler Mira Limited Mixing valve
GB2503279B (en) * 2012-06-22 2014-08-06 Kohler Mira Ltd Improvements in and relating to valves
US11674293B2 (en) 2012-06-22 2023-06-13 Kohler Mira Limited Mixing valve
US9758950B2 (en) 2012-06-22 2017-09-12 Kohler Mira Limited Plumbing fixture with integrated mixing valve
US9260844B2 (en) 2012-06-22 2016-02-16 Kohler Mira Limited Shower head with integrated mixing valve
US9340959B2 (en) 2012-06-22 2016-05-17 Kohler Mira Limited Plumbing fixture with mixing valve and controller
US9822513B2 (en) 2012-06-22 2017-11-21 Kohler Mira Limited Mixing valve
US9366015B2 (en) 2012-06-22 2016-06-14 Kohler Mira Limited Method of controlling mixing valve
US9909288B2 (en) 2012-06-22 2018-03-06 Kohler Mira Limited Plumbing fixture with mixing valve and controller
US9506227B2 (en) 2012-06-22 2016-11-29 Kohler Mira Limited Plumbing fixture with user interface
US11230829B2 (en) 2012-06-22 2022-01-25 Kohler Mira Limited Mixing valve
US9650769B2 (en) 2012-06-22 2017-05-16 Kohler Mira Limited Mixing valve
US9650770B2 (en) 2012-06-22 2017-05-16 Kohler Mira Limited Mixing valve
US9683352B2 (en) 2012-06-22 2017-06-20 Kohler Mira Limited Valve disinfecting method
GB2503279A (en) * 2012-06-22 2013-12-25 Kohler Mira Ltd Mixer valve
US10577784B2 (en) 2012-06-22 2020-03-03 Kohler Mira Limited Shower head with integrated mixing valve
WO2013190381A1 (en) * 2012-06-22 2013-12-27 Kohler Mira Limited Improvements in and relating to valves
US9376792B2 (en) 2012-06-22 2016-06-28 Kohler Mira Limited Plumbing fixture with integrated mixing valve
US9920507B2 (en) 2012-06-22 2018-03-20 Kohler Mira Limited Mixing valve
US9957700B2 (en) 2012-06-22 2018-05-01 Kohler Mira Limited Valve with heating element
US9957699B2 (en) 2012-06-22 2018-05-01 Kohler Mira Limited Plumbing fixture with heating elements
US10000914B2 (en) 2012-06-22 2018-06-19 Kohler Mira Limited Plumbing fixture with user interface
US10041234B2 (en) 2012-06-22 2018-08-07 Kohler Mira Limited Mixing valve
US10087607B2 (en) 2012-06-22 2018-10-02 Kohler Mira Limited Shower head with integrated mixing valve
US10106964B2 (en) 2012-06-22 2018-10-23 Kohler Mira Limited Method of controlling mixing valve
US10501915B2 (en) 2012-06-22 2019-12-10 Kohler Mira Limited Plumbing fixture with user interface
US10443751B2 (en) 2013-03-13 2019-10-15 Kohler Mira Limited Valve with fail-safe device
US9182047B2 (en) 2013-03-13 2015-11-10 Kohler Mira Limited Valve with fail-safe device
US9644757B2 (en) 2013-03-13 2017-05-09 Kohler Mira Limited Valve with fail-safe device
EP2778485A1 (en) * 2013-03-13 2014-09-17 Kohler Mira Limited Valve
EP3361105A4 (en) * 2015-10-08 2019-05-15 Volvo Construction Equipment AB Spool valve
US10633829B2 (en) 2015-10-08 2020-04-28 Volvo Construction Equipment Ab Spool valve
US11391021B2 (en) 2017-11-09 2022-07-19 Kohler Mira Limited Plumbing component

Also Published As

Publication number Publication date
JPS59186502U (en) 1984-12-11
GB8413934D0 (en) 1984-07-04
DE3420356A1 (en) 1984-12-06
JPH0444881Y2 (en) 1992-10-22
GB2143304B (en) 1986-07-02

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PCNP Patent ceased through non-payment of renewal fee