CN113531156B - Hydraulic drive type direct-acting three-way valve - Google Patents

Hydraulic drive type direct-acting three-way valve Download PDF

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Publication number
CN113531156B
CN113531156B CN202110783652.7A CN202110783652A CN113531156B CN 113531156 B CN113531156 B CN 113531156B CN 202110783652 A CN202110783652 A CN 202110783652A CN 113531156 B CN113531156 B CN 113531156B
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China
Prior art keywords
valve
driving
fan blade
pipe
space
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Active
Application number
CN202110783652.7A
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Chinese (zh)
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CN113531156A (en
Inventor
唐洪
王磊
唐宇
彭亮
王丰
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Yueyang Goaland Energy Saving Equipment Manufacturing Co ltd
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Yueyang Goaland Energy Saving Equipment Manufacturing Co ltd
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Application filed by Yueyang Goaland Energy Saving Equipment Manufacturing Co ltd filed Critical Yueyang Goaland Energy Saving Equipment Manufacturing Co ltd
Priority to CN202110783652.7A priority Critical patent/CN113531156B/en
Publication of CN113531156A publication Critical patent/CN113531156A/en
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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
    • F16K11/0716—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 with fluid passages through the valve member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B01D29/05—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements supported
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
    • B01D35/04—Plug, tap, or cock filters filtering elements mounted in or on a faucet
    • 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
    • F15B3/00—Intensifiers or fluid-pressure converters, e.g. pressure exchangers; Conveying pressure from one fluid system to another, without contact between the fluids
    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Multiple-Way Valves (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention discloses a hydraulic driving type direct-acting three-way valve, which belongs to the field of valve elements and comprises a valve pipe and an end cover which are connected together in a sealing way, wherein a valve core assembly is movably arranged in the valve pipe, two ends of the valve core assembly are provided with piston covers, a driving space with changeable volume is formed between the piston covers and the end cover, and the driving space is changed to enable the driving valve core assembly to move in the valve pipe; through using the driven mode of pressurized water, make the case subassembly can move to arbitrary position in the valve pipe, can use widely on a large scale, set up the filter element in the case subassembly, can carry out once filtration to the fluid that flows through, set up the flabellum in the case subassembly, can carry out the pressure boost after the pressure of valve body exit reduces to, can carry out the back flush through the mode of reversing with the impurity of filtering on the surface of filter element and get rid of, thereby reduced the piling up of impurity on the filter element.

Description

Hydraulic drive type direct-acting three-way valve
Technical Field
The invention belongs to the field of valve elements, and particularly relates to a hydraulic driving type direct-acting three-way valve.
Background
The three-way valve is a common component in a pipeline system, along with the continuous improvement of the demands of people, the demands of the three-way valve are also higher and higher, and the currently used high-precision three-way valve members can realize the detection of inlet and outlet pressure to control the action of a valve element and realize the automatic unattended operation, however, the high-precision control valve members can realize the refined control, but the manufacturing cost is also very expensive, the maintenance is very difficult, and the three-way valve members are not suitable for being used as popular products.
Because the tee valve belongs to a special-shaped element in a pipeline system, when fluid in the pipeline system flows through the valve, friction generated by the tee valve and the inner wall of a pipeline weakens the pressure of the fluid, so that the outlet pressure of the valve is reduced, the existing valve controls the movement of a valve element through detecting the outlet pressure, increases the flow of an outlet, and balances the pressure at the outlet, but the mode is only suitable for the condition of small pressure change, continuous replenishment cannot be performed when the pressure in the valve body is reduced, and the flow in the valve element needs to be on residual impurities of the liquid, so that the blockage of the valve element is reduced, and the requirement on the fluid is high.
Disclosure of Invention
The present invention has been made in view of the above problems, and an object of the present invention is to provide a hydraulic drive type direct-acting three-way valve that uses pressurized water to control the movement of a spool, reduces control costs, and is capable of filtering and pressurizing fluid flowing through the three-way valve.
In order to achieve the above purpose, the invention adopts the following technical scheme: a hydraulic drive type direct-acting three-way valve comprises a valve pipe and two end covers at two ends, wherein the valve pipe and the two end covers are connected together in a sealing way, a valve core component is movably arranged in the valve pipe,
two ends of the valve core component are provided with piston covers, a driving space with variable volume is formed between the piston covers and the end covers, and the driving space is changed to enable the valve core component to be driven to move in the valve pipe;
the driving space is connected with a first driving source for driving the change of the driving space.
As a further improvement of the technical scheme, the valve core assembly comprises a sealing element and two first connecting elements which are detachably and fixedly connected with two ends of the sealing element, wherein a filter element is arranged between one first connecting element and the sealing element, and the first connecting element and the piston cover are fixedly connected together through two second connecting elements.
As a further improvement of the technical scheme, a communication space for communicating two ends of the first connecting pieces at two sides is formed between the sealing piece and the first connecting pieces, fan blades are rotatably arranged in the communication space, a rotating shaft of each fan blade is sleeved with one of the second connecting pieces in a movable mode, a second driving source is connected to the rotating shaft of each fan blade, and the second driving source is arranged at the end portion of one of the end covers.
As a further improvement of the above technical solution, the end cap is welded to the end of the valve tube, and a first joint communicating with the driving space is provided on the valve tube.
As a further improvement of the technical scheme, the end cover is in threaded installation with the valve pipe, the end part of the end cover is provided with a second joint communicated with the driving space, and the second driving source is detachably and fixedly arranged at the end part of one of the end covers.
As a further improvement of the technical scheme, the end parts of the fan blades are fixedly provided with brushes, the brushes are in contact with the filtering piece, and a supporting piece capable of elastically moving is arranged on a rotating shaft between the fan blades and the brushes.
The invention has the beneficial effects that:
the invention provides a hydraulic driving type direct-acting three-way valve, 1, by using a pressure water driving mode, a valve core component can move to any position in a valve pipe, so that accurate control can be realized, and the pressure water control mode has very low cost and can be widely popularized and used.
2. The filter element is arranged in the valve element assembly, so that fluid flowing through the filter element can be filtered once, a pipeline system can be protected from being blocked, in addition, the fan blades are arranged in the valve element assembly, pressurization can be carried out after the pressure at the outlet of the valve body is reduced, and impurities on the surface of the filter element can be filtered in a reverse manner to be removed through back flushing, so that the accumulation of the impurities on the filter element is reduced.
3. Through setting up the brush, can make the flabellum clear up the surface of filter at rotatory in-process, support piece and brush are withstood, support the filter, reduce when rivers flow, break the filter, when back flushing again, can let brush and filter contact, guarantee that the surface impurity of filter can be scrubbed cleanly.
Drawings
Fig. 1 is a schematic perspective view of embodiment 1 of the present invention;
FIG. 2 is a schematic view of the structure of FIG. 1 in full section;
FIG. 3 is a schematic cross-sectional view of embodiment 2 of the present invention;
FIG. 4 is a schematic cross-sectional view of embodiment 3 of the present invention;
FIG. 5 is a schematic illustration of the structure of one embodiment of a valve cartridge assembly;
fig. 6 is a schematic structural view of the first connecting member.
The text labels in the figures are expressed as: 10. a valve tube; 11. an end cap; 12. a piston cap; 13. a driving space; 14. a seal; 15. a first connector; 16. a filter; 17. a communicating space; 18. a fan blade; 19. a second connector; 20. a second joint; 21. a first joint; 22. a brush; 23. and a support.
Detailed Description
In order that those skilled in the art may better understand the technical solutions of the present invention, the following detailed description of the present invention with reference to the accompanying drawings is provided for exemplary and explanatory purposes only and should not be construed as limiting the scope of the present invention.
As shown in the accompanying drawings 1-4 of the specification, the specific structure of the invention is as follows: a hydraulic drive type direct-acting three-way valve comprises a valve pipe 10 and two end covers 11, wherein the valve pipe 10 and the two end covers 11 are connected together in a sealing way, a valve core assembly is movably arranged in the valve pipe 10, a water outlet (shown as a in the specification drawing) and a water inlet (shown as b and c in the specification drawing) are arranged on the valve pipe 10, the valve core assembly is hollow, when moving in the valve pipe 10, one water outlet is blocked, the other water outlet is enabled to discharge water,
the two ends of the valve core component are provided with piston covers 12, the piston covers 12 are recessed towards the middle side of the valve pipe 10 and are in sealing connection with the inner wall of the valve pipe 10, a driving space 13 with a variable volume is formed between the piston covers 12 and the end covers 11, the driving space 13 is arranged at the two ends of the valve pipe 10, the driving space 13 is filled with a medium for pushing the driving space 13 to change, in the embodiment, the medium is water, and the driving space 13 is filled with pressurized water, so that the valve core component is driven to move in the valve pipe 10, and the driving space 13 can be changed to realize the movement of the valve core component in the valve pipe 10, so that the position of a water outlet is changed; the valve core assembly comprises a sealing element 14 and two first connecting pieces 15 which are detachably and fixedly connected with two ends of the sealing element 14, wherein the sealing element 14 is in a pipeline shape, the first connecting pieces 15 are in a round shape, through holes are formed in the first connecting pieces 15, the middle part and the outer part are connected through supporting ribs (as shown in figure 6 of the specification), the filtering pieces 16 are fixedly clamped at the end parts of two sides of the sealing element 14, the filtering pieces 16 are preferably filter screens, the filtering pieces 16 are fixedly pressed between the sealing element 14 and the first connecting pieces 15, the first connecting pieces 15 and the piston cover 12 are fixedly connected through two second connecting pieces 19, the second connecting pieces 19 are in a cylindrical rod shape,
the driving space 13 is connected with a connector (a second connector 20 and a first connector 21 shown in the specification) for connecting pressurized water, the connector comprises driving water pipes arranged at two ends of the valve pipe 10, the connected connector is connected with a first driving source for driving the valve pipe to change, and the first driving source can be a small diaphragm pump, a peristaltic pump, a circulating water pump in a water system and the like;
when a small diaphragm pump is used as a power source: the water inlet pipe and the water outlet pipe of the diaphragm pump are respectively connected with the driving water pipe, the valve core moves once when the diaphragm pump moves once, and the valve core moves reversely when the diaphragm pump moves reversely;
when the peristaltic pump is used, the water inlet pipe and the water outlet pipe of the peristaltic pump are respectively connected with the driving water pipe, the valve core moves once when the peristaltic pump moves once, and the valve core moves reversely when the peristaltic pump moves reversely;
when the circulating water pump in the water system is used; the water inlet and outlet of the water pump are respectively connected with the driving water pipe of the three-way valve by the electromagnetic valve, which of the driving water pipes is connected with the water inlet of the water pump and which is connected with the water outlet of the water pump is connected with the water inlet of the driving water pipe close to the water inlet a, and the driving water pipe on the other side is connected with the water outlet, so that the piston drives the valve core to move towards the direction of the water outlet b, otherwise, the piston moves reversely.
As shown in fig. 1-2 of the specification, embodiment 1 of the present invention:
further optimizing on the basis of the embodiment: the sealing member 14 and the first connecting member 15 form a communication space 17 for communicating the first connecting member 15 on two sides, the fan blade 18 is rotatably arranged in the communication space 17, the rotating shaft of the fan blade 18 is movably sleeved with the second connecting member 19 on one side far away from the water outlet, the rotating shaft of the fan blade 18 passes through the end part of the second connecting member 19, the rotating shaft of the fan blade 18 is connected with a second driving source, the second driving source is arranged at the end part of one end cover 11, particularly the end part of the end cover 11 which is detachably arranged on the position far away from the water outlet, the second driving source is preferably a small motor, the specific use model and the large xiao Xu are selected according to the size of a valve body in actual use and the use environment, the rotating shaft of the motor is in power transmission through a transmission shaft which is connected and stretches into the driving space 13, the rotating shaft of the fan blade 18 is matched with the output shaft of the motor through a spline form, but the rotating shaft of the fan blade 18 can not mutually rotate, so that the valve core assembly can conveniently slide in the valve tube 10 when the power transmission is ensured.
The end cover 11 and the valve tube 10 are installed in a sealing manner in a threaded manner, a second connector 20 communicated with the driving space 13 is arranged at the end part of the end cover 11, and the second connector 20 is respectively connected with a first driving source such as a small diaphragm pump, a peristaltic pump, a circulating water pump in a water system and the like so as to control the position of the valve core.
When the water pump is specifically used, the first driving source such as the small diaphragm pump, the peristaltic pump, the circulating water pump in the water system and the like is controlled to control the valve core assembly to move to a required position, when water at the water outlet b is required to be pressurized, the small motor is controlled to be started, the motor drives the fan blade 18 to rotate, so that the water can rapidly pass through the water outlet b to realize the purpose of pressurization, but only the water at the water outlet b can be pressurized, when the water outlet b is closed, when the water outlet c is used for discharging water, the motor is started to overturn, the water can reversely pass through the filter 16, impurities filtered on the filter 16 are reversely flushed into the water outlet c to be discharged, and when the motor reversely rotates, the motor is controlled to rotate at a low speed, so that the flow rate of the reversely flushed water is not too fast, and the filter 16 is prevented from being broken.
As shown in fig. 3 of the specification, embodiment 2 of the present invention is:
compared with the embodiment 1, in this embodiment, the end cover 11 is welded to the end of the valve tube 10, the valve tube 10 is provided with a first joint 21 communicating with the driving space 13, and the second driving source for driving the fan blade 18 to rotate is fixedly arranged on the end cover 11 at the end far from the water inlet a side, and the end cover 11 cannot be replaced after being installed and molded once.
As shown in fig. 4 of the specification, embodiment 3 of the present invention is:
compared with embodiment 2, the difference in this embodiment is that the fan blade 18 and the power source for driving the fan blade 18 to rotate are eliminated, and only by flushing the impurities on the surface of the filter element 16 when the water is discharged from the water outlet c.
As shown in fig. 5 of the specification, the valve core assembly in the embodiment 1-2 is further optimized:
the method specifically comprises the following steps: the end of the fan blade 18 is fixedly provided with the brush 22, the brush 22 contacts with the filter element 16, when the brush 22 rotates along with the fan blade 18, impurities filtered on the filter element 16 can be swept, so that the surface on the filter element 16 is cleaned, a supporting element 23 is arranged on a rotating shaft between the fan blade 18 and the brush 22, the supporting element 23 is in a ring-shaped sheet shape, a supporting element 23 for pushing the elastic floating of the supporting element 23 is arranged between the supporting element 23 and the fan blade 18, the supporting element 23 can have a certain supporting effect on the filter element 16, the filter element 16 can be prevented from being broken when water flows through the filter element 16, and the supporting element 23 can move in a floating manner, so that the water can flow normally in the communication space 17 conveniently, and the blocking effect on the water flow is reduced.
The specific use principle of the invention is as follows: by connecting the second joint 20 or the first joint 21, the driving space 13 is filled with pressurized water, and the valve core assembly is pushed to move in the valve pipe 10 after the pressurized water enters the driving space 13, so that the valve core can be controlled to move to a required position, the water entering the valve pipe 10 flows out from a required water outlet,
when water flows out from the water outlet b, the water is filtered under the action of the filter element 16, and the fan blades 18 are rotated by controlling the motor connected with the starting fan blades 18, so that the water flowing out of the water outlet b can be pressurized,
when the water flows out from the water outlet c, the motor connected with the starting fan blade 18 is controlled to rotate reversely, so that the water flows reversely to flush the filter element 16, and impurities filtered on the filter element 16 are discharged together at the water outlet c.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. The foregoing is merely illustrative of the preferred embodiments of this invention, and it is noted that there is objectively no limit to the specific structure disclosed herein, since numerous modifications, adaptations and variations can be made by those skilled in the art without departing from the principles of the invention, and the above-described features can be combined in any suitable manner; such modifications, variations and combinations, or the direct application of the inventive concepts and aspects to other applications without modification, are contemplated as falling within the scope of the present invention.

Claims (4)

1. The utility model provides a hydraulic drive formula direct-acting three-way valve, includes two end covers (11) of valve pipe (10) and both ends that sealing connection is in the same place, its characterized in that: a valve core component is movably arranged in the valve pipe (10),
piston covers (12) are arranged at two ends of the valve core assembly, a driving space (13) with a variable volume is formed between the piston covers (12) and the end covers (11), and the driving space (13) changes to enable the valve core assembly to move in the valve pipe (10);
the driving space (13) is connected with a first driving source for driving the change of the driving space;
the valve core assembly comprises a sealing element (14) and two first connecting elements (15) which are detachably and fixedly connected with two ends of the sealing element (14), wherein a filter element (16) is arranged between one first connecting element (15) and the sealing element (14), and the first connecting element (15) and the piston cover (12) are fixedly connected together through two second connecting elements (19);
the sealing element (14) and the first connecting piece (15) form a communication space (17) at two ends of the first connecting piece (15) at two sides of communication, a fan blade (18) is rotationally arranged in the communication space (17), a rotating shaft of the fan blade (18) and one of the second connecting pieces (19) are movably sleeved together, a second driving source is connected to the rotating shaft of the fan blade (18), and the second driving source is arranged at the end part of one of the end covers (11).
2. A hydraulically actuated direct acting three-way valve as defined in claim 1, wherein: the end cover (11) is welded at the end part of the valve pipe (10), and a first joint (21) communicated with the driving space (13) is arranged on the valve pipe (10).
3. A hydraulically actuated direct acting three-way valve as defined in claim 1, wherein: the end cover (11) is in threaded installation with the valve pipe (10), the end part of the end cover (11) is provided with a second joint (20) communicated with the inside of the driving space (13), and the second driving source is detachably and fixedly arranged at the end part of one of the end covers (11).
4. A hydraulically actuated direct acting three-way valve as defined in claim 1, wherein: the end part of the fan blade (18) is fixedly provided with a brush (22), the brush (22) is in contact with the filter element (16), and a support element (23) capable of elastically moving is arranged on a rotating shaft between the fan blade (18) and the brush (22).
CN202110783652.7A 2021-07-12 2021-07-12 Hydraulic drive type direct-acting three-way valve Active CN113531156B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110783652.7A CN113531156B (en) 2021-07-12 2021-07-12 Hydraulic drive type direct-acting three-way valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110783652.7A CN113531156B (en) 2021-07-12 2021-07-12 Hydraulic drive type direct-acting three-way valve

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Publication Number Publication Date
CN113531156A CN113531156A (en) 2021-10-22
CN113531156B true CN113531156B (en) 2023-05-09

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Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3426799A (en) * 1964-10-07 1969-02-11 Kinwell Dev Co Automatic valve
US4245670A (en) * 1978-11-06 1981-01-20 Robertshaw Controls Company Reversing valve construction and piston head assembly therefor and methods of making the same
JPS6330856Y2 (en) * 1980-07-19 1988-08-17
US4722358A (en) * 1986-03-12 1988-02-02 Wormald U.S., Inc. Pressure equalizing valve
CN2714907Y (en) * 2004-07-06 2005-08-03 葛敬 Hydraulic three-way valve
JP7301350B2 (en) * 2019-06-20 2023-07-03 株式会社不二工機 Flow switching valve

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