CN110017393B - Electric control boosting type slow-start valve - Google Patents
Electric control boosting type slow-start valve Download PDFInfo
- Publication number
- CN110017393B CN110017393B CN201810015369.8A CN201810015369A CN110017393B CN 110017393 B CN110017393 B CN 110017393B CN 201810015369 A CN201810015369 A CN 201810015369A CN 110017393 B CN110017393 B CN 110017393B
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- Prior art keywords
- sliding shaft
- piston
- chamber
- pressurizing
- valve
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000010411 cooking Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
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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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0675—Electromagnet aspects, e.g. electric supply therefor
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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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Multiple-Way Valves (AREA)
- Fluid-Driven Valves (AREA)
Abstract
The invention provides an electric control pressurizing type slow start valve, wherein a valve chamber with a main channel is arranged in the valve chamber, the valve chamber can be used for connecting a primary side pressure and a secondary side pressure at two sides of the valve chamber, a first sliding shaft chamber and a second sliding shaft chamber are also arranged in the valve chamber, the first sliding shaft chamber is internally provided with a first sliding shaft, the side wall of the first sliding shaft chamber is provided with a guide hole communicated to the top end of the first sliding shaft chamber, the second sliding shaft chamber is internally provided with a second sliding shaft, the second sliding shaft is respectively provided with a first piston and a second piston at the top end and the bottom end, a third piston is also arranged between the two pistons, the first piston is matched with the top end of the second sliding shaft chamber, an air chamber and a pressurizing chamber are respectively formed at the upper end surface and the lower end surface of the first piston, a pressurizing through hole communicated with the guide hole is arranged in the pressurizing chamber, when compressed air flowing into the second sliding shaft from the main channel at one time generates upward retarded displacement, the compressed air flowing through the guide hole can be input through the pressurizing through hole to push the first piston, and the second sliding shaft can be accelerated and displaced upwards again.
Description
Technical Field
The invention relates to an electric control pressurizing type slow start valve, which mainly aims at the situation that in the process of gradually increasing flow and pressure of a pneumatic cylinder, a first sliding shaft is matched with a closed overflow port to save energy, a pressurizing through hole is used for assisting in controlling a second sliding shaft, when the second sliding shaft generates upward retarded displacement, compressed gas flowing through a guide hole can be input through the pressurizing through hole, so that the second sliding shaft is rapidly displaced, and the secondary side pressure is safely and rapidly established.
Background
The pneumatic system is mainly a system for transmitting pressure and controlling energy by using compressed gas, and in order to control the operation state of the system, valve components are usually arranged between a pneumatic cylinder and a pneumatic source;
as shown in fig. 5, the control valve 90 has an input end 92 for inputting compressed gas 97, an output end 93 for outputting gas, and an exhaust end 94 for exhausting gas, and the control valve 90 is further provided with an a sliding shaft 95 and a B sliding shaft 96 inside for cooperating with the electromagnetic valve 91 to drive and actuate, thereby achieving the purpose of controlling the pressure of the output end 93;
when the solenoid valve 91 is driven to open the a sliding shaft 95, the compressed gas 97 of the input end 93 flows into the a sliding shaft 95, so that the a sliding shaft 95 is displaced to move downwards to the exhaust end 94, thereby closing the exhaust end 94, the gas at the moment can flow to the B sliding shaft 96 along the internal passage, and when the pressure of the compressed gas 97 reaches the default target, the B sliding shaft 96 is displaced downwards to be in an open state, so that the compressed gas 97 passes through the output end 93, thereby achieving the output purpose;
however, referring to fig. 6 again, which shows the actual structure of the control valve 90, it can be seen that, in the process of moving the a sliding shaft 95 downward to the exhaust end 94, the a sliding shaft 95 cannot sequentially close the exhaust end 94 and then open the input end 92, so that the gas of the input end 92 flows to the B sliding shaft 96 and the exhaust end 94 at the same time, which causes the compressed gas 97 to overflow and is accompanied by high decibel sharp noise;
furthermore, as disclosed in japanese patent No. 6076880, there is disclosed a control valve in which a primary port for inputting an air pressure source, a secondary port for outputting to a supply member, and a communication hole for communicating the primary port and the secondary port are provided in the control valve, a cylinder hole is provided in the valve chamber, a valve shaft having a tapered portion and an engagement portion is provided in association with the piston, and when compressed air enters from the primary port, the valve shaft is driven to displace, and by further engaging the tapered portion and the engagement portion with the communication hole, the control valve can achieve slow start control of the supplied member, and the problem of excessively complicated cooking structure is simplified;
the valve shaft and the piston arranged in the valve seat of the control valve or the throttling structure outside the valve seat do not see the related flow path capable of rapidly guiding and discharging the compressed air or other special structures can assist in discharging, so that if the control valve is used repeatedly for a plurality of times, the air pressure in the valve seat cannot be discharged, the internal pressure is full to the maximum pressure, and the pneumatic cylinder cannot be activated.
Disclosure of Invention
The invention relates to an electric control pressurizing type slow start valve, which has the main technical purposes that the overflow port is closed firstly by utilizing the sequence of the actuation of a first sliding shaft to save energy, then the primary side pressure is opened to enter a main channel, a pressurizing through hole is used for assisting in controlling a second sliding shaft, when the second sliding shaft generates upward retarded displacement, compressed gas flowing through a guide hole can be input through the pressurizing through hole, so that the second sliding shaft can rapidly displace, and the secondary side pressure can be safely and rapidly established.
The invention discloses an electric control pressurizing type slow-opening valve, which can supply compressed gas supplied by a pneumatic pressure source to a pneumatic cylinder, and comprises the following components: the valve chamber is provided with a primary side pressure connected with the air pressure source, a secondary side pressure connected with the air pressure cylinder and a main channel communicated with the primary side pressure and the secondary side pressure, the valve chamber is further provided with a first sliding shaft chamber and a second sliding shaft chamber, the first sliding shaft chamber is internally provided with a first sliding shaft, the side wall of the first sliding shaft chamber is provided with a guide hole communicated with the top end of the first sliding shaft, the bottom end of the first sliding shaft chamber is provided with an overflow port, the overflow port is communicated with the main channel, the second sliding shaft is internally provided with a second sliding shaft, the second sliding shaft is provided with a through hole in the vertical axial direction, the top end and the bottom end of the second sliding shaft are respectively provided with a first piston and a second piston, a third piston is arranged between the two pistons, the first piston is matched with the top end of the second sliding shaft chamber, an air chamber and a pressurizing chamber are respectively formed in the upper end face and the lower end face of the first piston, the pressurizing chamber is further provided with a pressurizing through hole and is communicated with the guide hole, when compressed air flows into the second sliding shaft from the main channel, the main channel to generate upward displacement, the compressed air can flow upwards through the guiding hole, and the second sliding shaft can be pushed upwards again through the pressurizing hole.
In the foregoing electric control pressurizing slow start valve, preferably, the area of the third piston is larger than the area of the first piston, and the area of the first piston is larger than the area of the second piston, when the third piston is driven by the compressed gas, the second sliding shaft is driven by the third piston to generate upward displacement.
In the foregoing electric control pressurizing slow start valve, preferably, when the first sliding shaft is driven to displace upward, the overflow port is synchronously opened; when the first sliding shaft is driven to move downwards, the overflow port is synchronously closed, and the switch of the overflow port is controlled by the sequence of the first sliding shaft to block the compressed gas from flowing and discharging simultaneously.
In the foregoing electric control pressurizing slow start valve, preferably, the needle valve and the second sliding shaft are coaxially arranged, and the gap between the needle valve and the second piston can be controlled by rotating and adjusting the needle valve, so that after the compressed gas passing through the gap reaches a certain flow and pressure, the third piston has enough acting force to enable the second sliding shaft to displace, and the second side pressure is opened and closed, so that the needle valve can control the flow and pressure of the compressed gas passing through the second sliding shaft chamber.
Preferably, the electric control pressurizing type slow start valve further comprises: and the sealing gasket is arranged at the bottom end of the pressurizing chamber and can seal the first piston and the pressurizing through hole, and after the electromagnetic valve is exhausted, the first piston can smoothly seal the pressurizing through hole to enable the second sliding shaft to return to the original position.
The invention provides an electric control pressurizing type slow start valve, which mainly aims at the situation that in the process of gradually increasing flow and pressure of a pneumatic cylinder, a first sliding shaft is matched with to close an overflow port to save energy, a pressurizing through hole is used for assisting in controlling a second sliding shaft, when the second sliding shaft generates upward retarded displacement, compressed gas flowing through a guide hole is matched with the pressurizing through hole to be input into a pressurizing chamber in the second sliding shaft through an electromagnetic valve, the speed of the second sliding shaft in upward displacement can be accelerated and driven, the secondary side pressure can be safely and quickly established, and the time consumed for switching can be more quickly shortened.
Drawings
FIG. 1 is a schematic diagram of a preferred embodiment of the present invention.
FIG. 1A is an enlarged view of a portion of FIG. 1 according to a preferred embodiment of the present invention.
FIG. 2 is a schematic view showing the first sliding shaft continuously operating in the closed state according to the preferred embodiment of the present invention.
Fig. 2A is a schematic view showing a state in which the first sliding shaft is continuously operated in the opening state according to the preferred embodiment of the present invention.
Fig. 2B is a schematic view of the first sliding shaft in the opened state according to the preferred embodiment of the present invention.
FIG. 3 is a schematic illustration of the start-up of the preferred embodiment of the present invention.
FIG. 3A is a schematic view showing the second sliding shaft continuously operating in the closed state according to the preferred embodiment of the present invention.
Fig. 3B is a schematic view of the second sliding shaft in the preferred embodiment of the invention after being continuously actuated.
FIG. 4 is a schematic diagram of a control loop in a ready state according to a preferred embodiment of the present invention.
Fig. 4A is a schematic diagram of a control loop in a slow-start state according to a preferred embodiment of the invention.
Fig. 4B is a schematic diagram of the control loop in an operating state according to the preferred embodiment of the invention.
Fig. 5 is a schematic diagram of a well-known structure.
Fig. 6 is a schematic diagram of a well-known structure.
Description of the drawings:
in fig. 1-4B:
electrically controlled pressurizing slow-opening valve
Solenoid valve
Input port
Output port
Valve chamber
Main channel
First slide shaft chamber
First slide shaft
Side wall
133. pilot hole
Overflow port
Second slip shaft chamber
Second slide shaft
142. through holes
1421. Gap
First piston
1431 upper end face
1432
Air chamber
Plenum chamber
1451. pressurizing through hole
1452 sealing gasket
Second piston
Third piston 147
Needle valve
P1. primary side pressure
P2. secondary side pressure
T. pneumatic source
TC. compressed gas
Pneumatic cylinder
In fig. 5-6:
90. control valve
91. electromagnetic valve
92. input terminal
93. the output terminal
94. exhaust end
95. A sliding shaft
96. A sliding shaft B
97. compressed gas
Detailed Description
Generally according to the invention, the best possible embodiment is shown in the drawingsThe drawings are presented in detail to enhance understanding of the invention;
please refer to the figureThe present invention provides an electrically controlled pressurizing type slow opening valve 10, which can supply compressed gas TC supplied by a pneumatic pressure source T to a pneumatic cylinder K, wherein the structure of the electrically controlled pressurizing type slow opening valve 10 comprises: a valve chamber 11 having a primary side pressure P1 connected to the pneumatic pressure source T, a secondary side pressure P2 connected to the pneumatic cylinder K, and a main passage 12 communicating with the primary side pressure P1 and the secondary side pressure P2, and a solenoid valve 101 provided above the valve chamber 11;
a first sliding shaft 131 disposed in the first sliding shaft chamber 13, wherein a sidewall 132 of the first sliding shaft chamber 13 is provided with a guiding hole 133, the guiding hole 133 is connected to the top end of the first sliding shaft chamber 13, and the bottom end of the first sliding shaft chamber 13 is further provided with an overflow port 134, the overflow port 134 is connected to the main channel 12, when the first sliding shaft 131 is displaced vertically and axially, the overflow port 134 can be opened or closed, so that the compressed gas TC in the main channel 12 can be discharged and controlled by the overflow port 134;
the second sliding shaft 141 is disposed in the second sliding shaft chamber 14, the second sliding shaft 141 is provided with a through hole 142 in a vertical axial direction, a first piston 143 and a second piston 146 are disposed at the top and bottom ends of the second sliding shaft 141, a third piston 147 is disposed between the first piston 143 and the second piston 146, a needle valve 15 is disposed at the bottom end of the second sliding shaft chamber 14, the needle valve 15 and the second sliding shaft 141 are coaxially disposed, and compared with the prior slow-start valve structure, the processing steps and cost are simplified, the space optimization application in the structure is facilitated, and when the needle valve 15 is rotationally adjusted in a clockwise direction and a counterclockwise direction, a partial gap 1421 is reserved between the apertures of the needle valve 15 and the second piston 146, the displacement opening and closing of the second sliding shaft 141 can be synchronously controlled, so that the flow and the pressure of the compressed gas TC passing through the second sliding shaft chamber 14 can be controlled;
the first piston 143 cooperates with the top end of the second sliding shaft chamber 14, and an air chamber 144 and a pressurizing chamber 145 are respectively formed on the upper end face 1431 and the lower end face 1432 of the first piston 143, a pressurizing through hole 1451 is further provided in the pressurizing chamber 145 and is communicated with the guiding hole 133, when compressed air TC flows into the second sliding shaft chamber 14 from the main channel 12, and the second sliding shaft 141 is caused to displace slowly upwards, compressed air TC flowing through the guiding hole 133 is input through the pressurizing through hole 1451 to push the first piston 143, so that the second sliding shaft 141 is driven by the first piston to displace rapidly upwards again.
When the compressed gas TC is introduced from the first side pressure P1 into the main channel 12, a portion of the compressed gas TC flows to the top end of the first spool chamber 13 through the guide hole 133, more specifically: the guide hole 133 is communicated from the side wall 132 until the upper part of the valve chamber 11 is connected with the input port 102 of the electromagnetic valve 101, and is connected to the top end of the first sliding shaft chamber 13 by the output port 103 of the electromagnetic valve 101, the flow rate of compressed gas TC input into the first sliding shaft chamber 13 is controlled by driving the electromagnetic valve 101, the input port 102 and the output port 103 are arranged in different planes, the guide hole 133 positioned at the section from the output port 103 to the top end of the first sliding shaft chamber 13 is also provided with a pressurizing through hole 1451, and the pressurizing through hole 1451 is communicated into the pressurizing chamber 145; the bottom end of the pressurizing chamber 145 is further provided with a sealing gasket 1452 for sealing the first piston 143 and the pressurizing through hole 1451, and after the electromagnetic valve 101 is exhausted, the first piston 143 can smoothly seal the pressurizing through hole 1451 to return the second sliding shaft 141 to the original position.
When the first sliding shaft 131 is pushed downward by the compressed gas TC, the overflow port 134 is closed, the compressed gas TC flows along the main channel 12 toward the second sliding shaft chamber 14, a partial gap 1421 is reserved between the needle valve 15 and the aperture of the second piston 141, and when the compressed gas TC enters the air chamber 144 from the through hole 142, the third piston 147 is pushed to slowly displace the second sliding shaft 141 upwards when the compressed gas TC passing through the gap 1421 reaches a certain flow rate and pressure;
in order to understand the above-described features of the present invention in detail, the displacement of the second slide shaft 141 is 5 units, and the slowest speed is assumed when the displacement of the second slide shaft 141 is from 0 units to 2 units; and when the stroke exceeds 2 units, starting to accelerate to 5 units to finish the stroke; however, the cooking structure is liable to be slower between 0 unit and 2 units or more than 2 units due to insufficient output gas flow and pressure, and the second sliding shaft 141 cannot be driven smoothly to perform the subsequent displacement.
Please refer to the figure againAs shown, when the solenoid valve 101 outputs the flow of compressed gas TC from the output port 103 to push the first sliding shaft 131, part of the compressed gas TC is also simultaneously delivered into the pressurizing chamber 145 through the pressurizing through hole 1451, and the third piston 147 is formed in an area>First piston 143>A second piston 146, thusWhen the compressed gas TC is accumulated to a certain flow rate and pressure through the gaps 1421 to the secondary side pressure P2, the third piston 147 is pushed upward to drive the second slide shaft 141 to slowly move upward in the second slide shaft chamber 14, and at this time, the pressure boosting through hole 1451 is also supplied with the compressed gas TC from the lower end face 1432 of the first piston 143 to push the first piston 143, so that the upward displacement rate of the second slide shaft 141 is accelerated, and the slowly moving stroke can be completed more rapidly, thereby solving the problems that the second slide shaft 141 is slowly displaced and cannot be smoothly driven due to insufficient flow rate and pressure of the cooking structure.
In summary, in the electrically controlled pressure-increasing slow-start valve 10 of the present invention, the overflow port 134 can be opened and closed by the first sliding shaft 131 during the process of gradually increasing the compressed gas TC in the pneumatic cylinder K, so as to solve the overflow and noise problems of the cooking structure, and the pressure-increasing through hole 1451 communicated with the guiding hole 133 is utilized to accelerate the compressed gas TC to assist the displacement rate of the second sliding shaft 141, so that the whole structure can operate more smoothly.
Claims (3)
1. An electrically controlled boost slow start valve capable of supplying compressed gas supplied by a pneumatic source to a pneumatic cylinder, comprising: a valve chamber having a primary side pressure connected to the pneumatic source, a secondary side pressure connected to the pneumatic cylinder, and a primary passage communicating with the primary side pressure and the secondary side pressure, the valve chamber further having a first spool chamber and a second spool chamber; the first sliding shaft is arranged in the first sliding shaft chamber, a guide hole is formed in the side wall of the first sliding shaft chamber, the guide hole is communicated to the top end of the first sliding shaft chamber, an overflow port is formed in the bottom end of the first sliding shaft chamber, the overflow port is communicated with the main channel, and when the first sliding shaft moves vertically and axially, the overflow port can be opened and closed; the second sliding shaft is arranged in the second sliding shaft chamber, a through hole is formed in the second sliding shaft in the vertical axial direction, a first piston and a second piston are respectively arranged at the top end and the bottom end of the second sliding shaft, a third piston is further arranged between the first piston and the second piston, a needle valve is further arranged at the bottom end of the second sliding shaft chamber, the first piston is matched with the top end of the second sliding shaft chamber, and an air chamber and a pressurizing chamber are respectively formed at the upper end face and the lower end face of the first piston; the method is characterized in that: the pressurizing chamber is further provided with a pressurizing through hole communicated with the guide hole, when the compressed gas flows into the second sliding shaft from the main channel to generate upward retarded displacement, the compressed gas flowing through the guide hole is input through the pressurizing through hole to push the first piston, so that the second sliding shaft can be accelerated and displaced again, the area of the third piston is larger than that of the first piston, the area of the first piston is larger than that of the second piston, and when the third piston is driven by the compressed gas, the second sliding shaft is driven by the third piston to generate upward displacement; wherein the first sliding shaft is driven to move upwards, and then the overflow port is synchronously opened; when the first sliding shaft is driven to move downwards, the overflow port is synchronously closed, and the switch of the overflow port is controlled by the sequence of the first sliding shaft to block the compressed gas from flowing and discharging simultaneously.
2. The valve of claim 1, wherein the needle valve is coaxially disposed with the second sliding shaft, and the needle valve is rotatably adjusted to control the gap between the needle valve and the second piston, such that the third piston has sufficient force to displace the second sliding shaft and open and close the second lateral pressure after the compressed gas passing through the gap reaches a certain flow and pressure, such that the needle valve can control the flow and pressure of the compressed gas passing through the second sliding shaft chamber.
3. The electrically controlled boost slow start valve of claim 1, wherein the plenum further comprises: and the sealing gasket is arranged at the bottom end of the pressurizing chamber and can seal the first piston and the pressurizing through hole, and after the electromagnetic valve is exhausted, the first piston can smoothly seal the pressurizing through hole to enable the second sliding shaft to return to the original position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810015369.8A CN110017393B (en) | 2018-01-08 | 2018-01-08 | Electric control boosting type slow-start valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810015369.8A CN110017393B (en) | 2018-01-08 | 2018-01-08 | Electric control boosting type slow-start valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110017393A CN110017393A (en) | 2019-07-16 |
| CN110017393B true CN110017393B (en) | 2024-04-12 |
Family
ID=67187462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810015369.8A Active CN110017393B (en) | 2018-01-08 | 2018-01-08 | Electric control boosting type slow-start valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110017393B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB773142A (en) * | 1951-12-07 | 1957-04-24 | Electraulic Presses Ltd | Improvements in and relating to fluid-pressure actuated bye-pass valves |
| US4706624A (en) * | 1986-06-10 | 1987-11-17 | The Jacobs Manufacturing Company | Compression release retarder with valve motion modifier |
| CN1208141A (en) * | 1997-08-11 | 1999-02-17 | 胡斯可国际股份有限公司 | Pilot solenoid control valve and hydraulic control system using same |
| CN104321492A (en) * | 2012-04-09 | 2015-01-28 | 劳伦斯·L·弗拉姆 | Pressure limiting valve and alternative method for testing a backflow preventer using the same |
| TW201518629A (en) * | 2013-11-05 | 2015-05-16 | Koganei Ltd | Control valve |
| CN105518310A (en) * | 2013-09-02 | 2016-04-20 | Smc株式会社 | Fluid control valve |
| CN207864715U (en) * | 2018-01-08 | 2018-09-14 | 上海气立可气动设备有限公司 | Automatically controlled boosting type opens valve slowly |
-
2018
- 2018-01-08 CN CN201810015369.8A patent/CN110017393B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB773142A (en) * | 1951-12-07 | 1957-04-24 | Electraulic Presses Ltd | Improvements in and relating to fluid-pressure actuated bye-pass valves |
| US4706624A (en) * | 1986-06-10 | 1987-11-17 | The Jacobs Manufacturing Company | Compression release retarder with valve motion modifier |
| CN1208141A (en) * | 1997-08-11 | 1999-02-17 | 胡斯可国际股份有限公司 | Pilot solenoid control valve and hydraulic control system using same |
| CN104321492A (en) * | 2012-04-09 | 2015-01-28 | 劳伦斯·L·弗拉姆 | Pressure limiting valve and alternative method for testing a backflow preventer using the same |
| CN105518310A (en) * | 2013-09-02 | 2016-04-20 | Smc株式会社 | Fluid control valve |
| TW201518629A (en) * | 2013-11-05 | 2015-05-16 | Koganei Ltd | Control valve |
| CN207864715U (en) * | 2018-01-08 | 2018-09-14 | 上海气立可气动设备有限公司 | Automatically controlled boosting type opens valve slowly |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110017393A (en) | 2019-07-16 |
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