CN109083876B - Balance loop using electromagnetic one-way valve with adjustable stopping direction - Google Patents
Balance loop using electromagnetic one-way valve with adjustable stopping direction Download PDFInfo
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- CN109083876B CN109083876B CN201811060971.XA CN201811060971A CN109083876B CN 109083876 B CN109083876 B CN 109083876B CN 201811060971 A CN201811060971 A CN 201811060971A CN 109083876 B CN109083876 B CN 109083876B
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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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
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- General Engineering & Computer Science (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
A balance loop using an electromagnetic one-way valve with an adjustable cut-off direction comprises a first shell and a second shell which are connected with each other, wherein the first shell is provided with a first through hole, the second shell is provided with a fourth connecting hole communicated with the first through hole, the one-way valve further comprises a first valve core matched and connected with the first through hole in a sliding mode and a first spring for extruding the first valve core, the first valve core can seal the fourth connecting hole, the second shell is provided with a second through hole, the first shell is provided with a second connecting hole communicated with the second through hole, and the second connecting hole is communicated with the fourth connecting hole; the check valve further includes: the second valve core is matched and connected with the second through hole in a sliding mode, and the second spring extrudes the second valve core; the first electromagnet driving device is connected with the first shell and can drive the first valve core to be separated from the fourth connecting hole; and the second electromagnet driving device is connected with the second shell and can drive the second valve core to be separated from the second connecting hole.
Description
Technical Field
The invention relates to a check valve, in particular to a balance loop using an electromagnetic check valve with adjustable cut-off direction.
Background
The balance circuit is used for keeping a certain back pressure value on an oil return path of the hydraulic actuating element so as to balance the gravity load and prevent the gravity load from falling down automatically due to self weight. FIG. 4 shows a conventional balancing circuit using a one-way sequence valve, where a certain back pressure exists in the return line when the piston is down after the 1YA is powered; as long as the back pressure is adjusted to support the dead weight of the piston and the working component connected with the piston, the piston can stably fall down, and when the reversing valve is in the middle position, the piston stops moving and does not continuously move down. This circuit has a large power loss when the piston moves down rapidly.
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned drawbacks of the prior art by providing a balancing circuit using an electromagnetic check valve with an adjustable blocking direction, which has a small power loss when the piston moves down rapidly.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides an use balanced return circuit of electromagnetism check valve of adjustable cut-off direction, it includes oil pump, oil tank, pneumatic cylinder, sequence valve, the pneumatic cylinder include with the communicating last oil pocket of oil pump and with the communicating lower oil pocket of sequence valve, the sequence valve with the oil tank communicates with each other, its characterized in that: the balance loop further comprises an electromagnetic one-way valve with an adjustable stopping direction, and the electromagnetic one-way valve with the adjustable stopping direction is connected with the sequence valve in parallel.
In addition, the invention also provides the following auxiliary technical scheme:
the electromagnetic one-way valve with the adjustable stop direction comprises a first shell and a second shell which are connected with each other, wherein the first shell is provided with a first through hole and a second connecting hole, the second shell is provided with a fourth connecting hole communicated with the first through hole and a second through hole communicated with the second connecting hole, the second connecting hole is communicated with the fourth connecting hole,
the electromagnetic check valve with the adjustable stopping direction further comprises:
the first valve core is matched and connected with the first through hole in a sliding mode, and the first spring extrudes the first valve core;
the second valve core is matched and connected with the second through hole in a sliding mode, and the second spring presses the second valve core, and the second valve core can seal the second connecting hole;
the first electromagnet driving device is connected with the first shell and can drive the first valve core to be separated from the fourth connecting hole;
and the second electromagnet driving device is connected with the second shell and can drive the second valve core to be separated from the second connecting hole.
The first electromagnet driving device comprises a first armature, and a first pull rod is connected between the first armature and the first valve core.
The first electromagnet driving device comprises a first shell connected with the first shell and a first coil arranged in the first shell and used for driving the first armature to move.
The first electromagnet driving device further comprises a first handle located outside the first shell and connected with the first armature.
The second electromagnet driving device comprises a second armature, and a second pull rod is connected between the second armature and the second valve core.
The second electromagnet driving device further comprises a second shell connected with the second shell and a second coil arranged in the second shell and driving the second armature to move.
The second electromagnet driving device further comprises a first flow through hole which is located outside the second shell and connected with the second armature, the first shell is provided with a first flow through hole communicated with the first through hole and the second connecting hole, the second shell is provided with a second flow through hole communicated with the second through hole and the fourth connecting hole, and the second flow through hole is matched with the first flow through hole.
The balance loop using the electromagnetic one-way valve with the adjustable stopping direction further comprises a three-position four-way reversing valve, wherein the reversing valve comprises a P port communicated with the oil pump, an A port communicated with the upper oil cavity, a B port communicated with the sequence valve and the electromagnetic one-way valve with the adjustable stopping direction and a T port communicated with the oil tank.
Compared with the prior art, the invention has the advantages that:
1. the balance loop using the electromagnetic one-way valve with the adjustable cut-off direction has higher efficiency and small power loss in the process of rapid descending of the piston;
2. the state of the first valve core and the second valve core is automatically changed through the electromagnet driving device, so that the electromagnetic one-way valve can conveniently control the direction of reverse flow of oil, and in addition, the electromagnetic one-way valve can also reach the state of complete conduction and cut-off, the functions are more diversified, and the electromagnetic one-way valve is simple and convenient to operate, high in reliability and convenient to realize automation.
Drawings
Fig. 1 is a schematic view of the structure of the check valve of the present invention.
Fig. 2 is a left side view of the check valve of fig. 1.
Fig. 3 is a schematic structural view of the check valve of the present invention after the flow restriction direction is changed.
Fig. 4 is a schematic diagram of a prior art balancing circuit.
Fig. 5 is a schematic diagram of the balancing circuit of the present invention when the piston is rapidly lowered.
FIG. 6 is a schematic diagram of a balancing circuit of the present invention when the piston descends at a constant velocity.
Detailed Description
The present invention will be described in further non-limiting detail with reference to the following preferred embodiments and accompanying drawings.
As shown in fig. 1 and 2, the electromagnetic check valve with adjustable blocking direction according to a preferred embodiment of the present invention includes a first housing 10 and a second housing 50 connected to each other, the first housing 10 and the second housing 50 are connected by a flange, the first housing 10 and the second housing 50 are respectively provided with a first flange 11 and a second flange 51, which are matched with each other, and the first housing 10 and the second housing 50 are fastened together by bolts and nuts.
The balancing circuit using the electromagnetic check valve with the adjustable cut-off direction of the present invention further includes a first solenoid driving device 100 and a second solenoid driving device 150 respectively connected to the first housing 10 and the second housing 50.
A first through hole 12 is formed in the end face of one end of the first shell 10, a first connecting hole 13 and a second connecting hole 14 are formed in the end face of the other end of the first shell 10, a first through hole 15 for communicating the first connecting hole 13 with the first through hole 12 is further formed in the first shell 10, and preferably, the first connecting hole 13 and the first through hole 15 are coaxially arranged; the second connection bore 14 communicates with the first through-flow bore 12 and is used for connecting an external oil line.
The second housing 50 has a structure similar to that of the first housing 10, wherein a second through hole 52 matching with the first through hole 12 is formed in an end face of one end of the second housing, a third connecting hole 53 and a fourth connecting hole 54 are formed in an end face of the other end of the second housing, a second through hole 55 communicating the third connecting hole 53 with the fourth connecting hole 54 is further formed in the second housing 50, and preferably, the third connecting hole 53 and the second through hole 55 are coaxially arranged; the fourth connection hole 54 communicates with the second through-hole 52, and is used for connecting an external oil line.
Preferably, after the first housing 10 and the second housing 50 are connected, the second connection hole 14 is coaxial with the second through hole 55; the fourth connection hole 54 is coaxial with the first through hole 15.
The check valve of the present invention further includes a first spool 16, a first anti-backup sleeve 17, a first pull rod 18, and a first spring 19.
Wherein the first valve core 16 is slidably fitted in the first through hole 15, and in one embodiment, the fitting relationship with the first through hole 15 can refer to the fitting relationship of the piston and the cylinder body of the oil cylinder in the prior art. One end of the first valve core 16 is provided with a first conical surface 71 capable of sealing the fourth connecting hole 54, the other end is provided with a first blind hole 70, and a first bottom surface 72 of the first blind hole 70 is further provided with a first screw hole 73 in threaded connection with the first pull rod 18. The first valve body 16 is further provided with a first through hole 75 that is in fluid communication with the first and second through holes 12, 52 in the radial direction.
One end of the first pull rod 18 is screwed in the first screw hole 73, and the other end of the first pull rod extends out of the first connection hole 13 to be connected with the first electromagnet driving device 100, and after the first electromagnet driving device 100 is powered on, the first pull rod 18 can be pulled outwards, so that the first valve core 16 is separated from the fourth connection hole 54.
The surface of the first connecting hole 13 is provided with threads, the first anti-backing sleeve 17 is in threaded connection with the first connecting hole 13, the first pull rod 18 is arranged in the first anti-backing sleeve 17 in a penetrating mode, and the first anti-backing sleeve 17 is provided with a first supporting surface 74.
The first spring 19 is disposed in the first blind hole 70, and is sleeved on the first pull rod 18, and two ends of the first spring respectively abut against the first supporting surface 74 and the first bottom surface 72. The first spring 19 applies a force to the first spool 16 in the direction of the fourth connection hole 54; so that the first valve spool 16 can abut against and seal the fourth connecting hole 54 when the first solenoid driving device 100 is not energized; when the first solenoid driving device 100 is powered on, the first solenoid driving device 100 can drive the first valve core 16 to be separated from the fourth connecting hole 54.
The check valve of the present invention further includes a second spool 56, a second anti-backup sleeve 57, a second pull rod 58, and a second spring 59.
Wherein the second valve core 56 is slidably engaged in the second through hole 55, and in one embodiment, the engagement relationship with the second through hole 55 is as the engagement relationship between the piston and the cylinder body of the oil cylinder in the prior art. One end of the second valve core 56 is provided with a second taper surface 81 capable of sealing the fourth connecting hole 54, the other end is provided with a second blind hole 80, and a second bottom surface 82 of the second blind hole 80 is further provided with a second screw hole 83 in threaded connection with the second pull rod 58. The second spool 56 is also provided with a second through-hole 85 in radial direction, which is in fluid communication with the first and second through- holes 12, 52.
One end of the second pull rod 58 is screwed in the second screw hole 83, and the other end of the second pull rod extends out of the third connecting hole 53 to be connected with the second electromagnet driving device 150, and the second electromagnet driving device 150 can pull the second pull rod 58 outwards after being electrified, so that the second valve core 56 is separated from the second connecting hole 14.
The surface of the third connecting hole 53 is provided with threads, the second anti-back sleeve 57 is connected in the third connecting hole 53 in a threaded manner, the second pull rod 58 penetrates through the second anti-back sleeve 57, and the second anti-back sleeve 57 is provided with a second supporting surface 84.
The second spring 59 is disposed in the second blind hole 80, and the second spring is sleeved on the second pull rod 58, and two ends of the second spring respectively abut against the second supporting surface 84 and the second bottom surface 82. The second spring 59 applies a force to the second spool 56 in the direction toward the second through hole 55; so that the second spool 56 can abut against and seal the second connecting hole 14 when the second electromagnet driving device 150 is not energized; when the second electromagnet driving device 150 is powered on, the second electromagnet driving device 150 can drive the second valve core 56 to be separated from the second connecting hole 14.
The first electromagnetic driving device 100 includes a first housing 101 attached to a side of the first casing 10, a first coil 102 disposed in the first housing 101, and a first armature 103 slidably fitted in the first housing 101 and driven by the first coil 102. The first armature 103 is connected to the first pull rod 18 at one end via a first link 104 and a connecting sleeve 105, and is provided with a second link 106 at the other end, and the second link 106 extends out of the first housing 101 and is provided with a first handle 107. When the first coil 102 is energized, the first armature 103 is driven to move outward, so that the first valve core 16 is out of contact with the fourth connecting hole 54, and when the first valve core 16 is de-energized, the first valve core returns to the original position under the action of the spring force (the energizing of the coil to drive the armature to move is well known in the art and is not described in detail herein). In addition, in some special cases, the first valve core 16 can also be opened by pulling the first handle 107 by hand.
The second electromagnet driving device 150 includes a second housing 151 connected to a side of the second casing 50, a second coil 152 disposed in the second housing 151, and a second armature 153 slidably coupled in the second housing 151 and driven by the second coil 152. One end of the second armature 153 is connected to the second pull rod 58 through a third connecting rod 154 and a connecting sleeve 155, and the other end is provided with a fourth connecting rod 156, and the fourth connecting rod 156 extends out of the second housing 151 and is provided with a second handle 157. After the second coil 152 is energized, the second armature 153 is driven to move outwards, so that the second valve core 56 is separated from the second connecting hole 14, and after the second coil is de-energized, the second valve core 56 returns to the original position under the action of the spring force. In addition, in some special cases, the second valve spool 56 can also be opened by pulling the second handle 157 by hand.
As shown in fig. 1, when the first electromagnet driving device 100 is de-energized and the second electromagnet driving device 150 is energized, the first valve core 16 abuts against the fourth connecting hole 54, and the second valve core 56 is separated from the second connecting hole 14, at this time, after the oil enters from the fourth connecting hole 54, the oil pushes away the first valve core 16 and flows out from the second connecting hole 14 through the first and second through holes 12, 52; if oil flows in from the second connecting hole 14, the pressure of the oil further presses the first valve element 16 against the fourth connecting hole 54 due to the first spring 19 pressing the first valve element 16 against the fourth connecting hole 54, so that the oil cannot flow into the fourth connecting hole 54, i.e., only the oil is allowed to flow in from the second connecting hole 14 and flow out from the fourth connecting hole 54.
Correspondingly, as shown in fig. 2, when the first electromagnet driving device 100 is powered on and the second electromagnet driving device 150 is powered off, the first valve core 16 is separated from the fourth connecting hole 54, and the second valve core 56 is abutted against the second connecting hole 14, at this time, after the oil enters from the second connecting hole 14, the oil can push the second valve core 56 open and flow out from the fourth connecting hole 54 through the first and second through holes 12 and 52; if the oil flows in from the fourth connecting hole 54, the pressure of the oil further presses the second spool 56 against the second connecting hole 14 because the second spring 59 presses the second spool 56 against the second connecting hole 14, so that the oil cannot flow into the second connecting hole 14, that is, only the oil is allowed to flow in from the fourth connecting hole 54 and flow out from the second connecting hole 14.
Obviously, when the first and second electromagnets 100 and 150 are both powered, the first and second valve spools 10 and 50 are both in an open state, and the whole valve body is in a fully conductive state; when both the first and second solenoid driving devices 100 and 150 are de-energized, the first and second valve spools 10 and 56 are respectively in contact with the fourth connection hole 54 and the second connection hole 14, and at this time, the entire valve body is in a completely closed state, that is, the oil passage is cut off.
Fig. 5 and 6 show a balancing circuit of the present invention, which uses the above-mentioned electromagnetic check valve 200 with adjustable blocking direction (the electromagnetic check valve 200 is illustrated by a rectangular frame and a check valve therein), in which the electromagnetic check valve 200 replaces the ordinary check valve in fig. 4, the second connecting hole 14 of the electromagnetic check valve 200 is connected with the lower oil chamber 203 of the hydraulic cylinder 202 through the first pipeline 201, and the fourth connecting hole 54 is connected with the port B of the reversing valve 204.
When the piston 205 needs to be rapidly lowered, the first solenoid driving device 100 of the solenoid check valve 200 is powered on, and the second solenoid driving device 150 is powered off, so that the hydraulic pressure principle diagram is shown in fig. 5, and oil can flow into the second connecting hole 14 and flow out through the fourth connecting hole 54. The electromagnetic valve 1YA of the reversing valve 204 is powered on, oil enters the port a from the port P and enters the upper oil chamber 207 through the second pipeline 206, oil in the lower oil chamber 203 enters the second connecting hole 14 from the first pipeline 201 and flows out through the fourth connecting hole 54, and because the resistance of the oil flowing through the electromagnetic check valve 200 is far less than the resistance of the oil flowing through the pilot sequence valve 208, the piston 205 can have high efficiency and low power loss when rapidly descending.
When the piston 205 needs to fall smoothly, the first solenoid driving device 100 of the solenoid check valve 200 is de-energized, and the second solenoid driving device 150 is energized, so that the hydraulic schematic diagram is shown in fig. 6, the oil cannot flow into the second connecting hole 14 and flow out through the fourth connecting hole 54, and the oil in the lower oil chamber 203 can only flow into the port B from the pilot sequence valve 208 and flow into the oil tank 209 from the port B.
In this way, the piston 205 can be controlled to fall smoothly or rapidly by simply adjusting the energization states of the first and second electromagnets 100 and 150.
The invention has at least the following advantages:
1. the balance loop using the electromagnetic one-way valve with the adjustable cut-off direction has higher efficiency and small power loss in the process of rapid descending of the piston;
2. the state of the first valve core and the second valve core is automatically changed through the electromagnet driving device, so that the electromagnetic one-way valve can conveniently control the direction of reverse flow of oil, and in addition, the electromagnetic one-way valve can also reach the state of complete conduction and cut-off, the functions are more diversified, and the electromagnetic one-way valve is simple and convenient to operate, high in reliability and convenient to realize automation.
It should be noted that the above-mentioned preferred embodiments are merely illustrative of the technical concepts and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (9)
1. A balancing circuit using an electromagnetic non-return valve with adjustable blocking direction, comprising an oil pump (210), an oil tank (209), a hydraulic cylinder (202), a sequence valve (208), said hydraulic cylinder (202) comprising an upper chamber (207) communicating with said oil pump (210) and a lower chamber (203) communicating with said sequence valve (208), said sequence valve (208) communicating with said oil tank (209), characterized in that: the balance loop further comprises an electromagnetic check valve (200) with adjustable cut-off direction, and the electromagnetic check valve (200) with adjustable cut-off direction is connected with the sequence valve (208) in parallel; the electromagnetic one-way valve with the adjustable stop direction comprises a first shell (10) and a second shell (50) which are connected with each other, wherein the first shell (10) is provided with a first through hole (15) and a second connecting hole (14), the second shell (50) is provided with a fourth connecting hole (54) communicated with the first through hole (15) and a second through hole (55) communicated with the second connecting hole (14), and the second connecting hole (14) and the fourth connecting hole (54) can be communicated with each other,
the electromagnetic check valve with the adjustable stopping direction further comprises:
a first valve core (16) matched with the first through hole (15) in a sliding mode and a first spring (19) pressing the first valve core (16), wherein the first valve core (16) can seal the fourth connecting hole (54);
a second valve core (56) matched with the second through hole (55) in a sliding mode and a second spring (59) pressing the second valve core (56), wherein the second valve core (56) can seal the second connecting hole (14);
the first electromagnet driving device (100) is connected with the first shell (10), and the first electromagnet driving device (100) can drive the first valve core (16) to be separated from the fourth connecting hole (54);
and the second electromagnet driving device (150) is connected with the second shell (50), and the second electromagnet driving device (150) can drive the second valve core (56) to be separated from the second connecting hole (14).
2. The balance circuit using the electromagnetic check valve with the adjustable cut-off direction as recited in claim 1, wherein: the first solenoid drive (100) comprises a first armature (103), and a first pull rod (18) is connected between the first armature (103) and the first valve element (16).
3. The balance circuit using the electromagnetic check valve with the adjustable cut-off direction as recited in claim 2, wherein: the first electromagnet driving device (100) comprises a first shell (101) connected with the first shell (10) and a first coil (102) which is arranged in the first shell (101) and drives the first armature (103) to move.
4. A balancing circuit using a solenoid check valve with adjustable blocking direction according to claim 3, characterized in that: the first electromagnet drive (100) further comprises a first handle (107) located outside the first housing (10) and connected to the first armature (103).
5. The balance circuit using the electromagnetic check valve with the adjustable cut-off direction as recited in claim 1, wherein: the second electromagnet drive (150) comprises a second armature (153), and a second pull rod (58) is connected between the second armature (153) and the second valve core (56).
6. The balance circuit using the electromagnetic check valve with the adjustable cut-off direction as recited in claim 5, wherein: the second electromagnet driving device (150) further comprises a second outer shell (151) connected with the second shell (50) and a second coil (152) arranged in the second outer shell (151) and driving the second armature (153) to move.
7. The balance circuit using the electromagnetic check valve with the adjustable cut-off direction as recited in claim 6, wherein: the second electromagnet drive (150) further comprises a second handle (157) located outside the second housing (50) and connected to the second armature (153).
8. The balance circuit using the electromagnetic check valve with the adjustable cut-off direction as recited in claim 1, wherein: the first shell (10) is provided with a first flow through hole (75) communicated with the first through hole (15) and the second connecting hole (14), the second shell (50) is provided with a second flow through hole (85) communicated with the second through hole (55) and the fourth connecting hole (54), and the second flow through hole (85) is matched with the first flow through hole (75).
9. The balance circuit using the electromagnetic check valve with the adjustable cut-off direction as recited in claim 1, wherein: the oil pump oil tank further comprises a three-position four-way reversing valve (204), wherein the reversing valve (204) comprises a port P communicated with the oil pump (210), a port A communicated with the upper oil cavity (207), a port B communicated with the sequence valve (208) and the electromagnetic one-way valve (200) with the adjustable stopping direction, and a port T communicated with the oil tank (209).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811060971.XA CN109083876B (en) | 2018-09-12 | 2018-09-12 | Balance loop using electromagnetic one-way valve with adjustable stopping direction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811060971.XA CN109083876B (en) | 2018-09-12 | 2018-09-12 | Balance loop using electromagnetic one-way valve with adjustable stopping direction |
Publications (2)
| Publication Number | Publication Date |
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| CN109083876A CN109083876A (en) | 2018-12-25 |
| CN109083876B true CN109083876B (en) | 2020-05-01 |
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| CN201811060971.XA Active CN109083876B (en) | 2018-09-12 | 2018-09-12 | Balance loop using electromagnetic one-way valve with adjustable stopping direction |
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| CN109027332B (en) * | 2018-09-12 | 2020-01-03 | 苏州丹顿机电有限公司 | Check valve with adjustable stop direction |
| CN108869849B (en) * | 2018-09-12 | 2020-05-01 | 苏州丹顿机电有限公司 | Electromagnetic one-way valve with adjustable stop direction |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2032581B (en) * | 1978-10-24 | 1983-01-06 | Mac Valves Inc | Combined pressure reductor and flow control valve |
| CN202501051U (en) * | 2011-12-23 | 2012-10-24 | 上海立新液压有限公司 | Electromagnetic control non-return valve |
| DE102014016701A1 (en) * | 2014-11-12 | 2016-05-12 | Festo Ag & Co. Kg | Controllable check valve |
| CN106704313B (en) * | 2016-12-16 | 2018-02-06 | 上海中联重科桩工机械有限公司 | Rotary drilling rig and mast hydraulic control system and mast raising/decline control method |
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