CN109611399B - Throttle valve and pressure relief system - Google Patents
Throttle valve and pressure relief system Download PDFInfo
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- CN109611399B CN109611399B CN201811361026.3A CN201811361026A CN109611399B CN 109611399 B CN109611399 B CN 109611399B CN 201811361026 A CN201811361026 A CN 201811361026A CN 109611399 B CN109611399 B CN 109611399B
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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
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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
- F15B13/024—Pressure relief valves
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/02—Servomotor systems with programme control derived from a store or timing device; Control devices therefor
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- Engineering & Computer Science (AREA)
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- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
- Safety Valves (AREA)
Abstract
The invention relates to a throttling valve and a pressure relief system. The choke valve includes the valve body, the valve body includes pressure release entry, pressure release export and interface channel, and interface channel disposes the throttle lever, and the throttle lever disposes control cylinder, fixed connection between control cylinder's piston and the throttle lever, establish to an organic whole or roof pressure cooperation, and control cylinder deviates from throttle lever one side at the piston and forms the control oil pocket, and the control oil pocket is connected with the oiling valve, and control cylinder still is connected with the constant volume oil pocket through two three way valve, is equipped with the oil extraction piston in the constant volume oil pocket, is equipped with the oil extraction elastic component in the oil extraction piston. The control three-way valve is communicated with the control oil duct and the adjusting oil duct, the throttle rod pushes the control piston under the pressure of high-pressure liquid, so that the control piston and the throttle rod move towards the direction of the pressure applied to the throttle rod, and the pressure relief speed of the throttle valve is increased. When the volume of the constant volume oil chamber is smaller than that of the control oil chamber and is larger than that of the control oil chamber, the control piston moves in a micro stepping mode, the three-way valve is continuously controlled, and pressure relief can be completed through small pressure difference change.
Description
Technical Field
The invention relates to a throttling valve and a pressure relief system.
Background
The synthetic equipment of the artificial diamond in China is a cubic hydraulic press which adopts an ultrahigh pressure hydraulic system with the oil pressure reaching 100 MPa. The super-high pressure oil pump is equipped to directly output oil pressure up to 100MPa to the working cylinder of the cubic press, and the pressure is reduced to zero by discharging flow from the super-high pressure pipeline after the pressing work of the press is finished. At present, an ultrahigh pressure relief system of a cubic press basically adopts on-off control of an electromagnetic directional valve to realize pressure relief, and in order to prevent pressure relief impact during ultrahigh pressure relief, a small liquid flow damping hole is formed in a relief valve to control the speed of discharging oil. The pressure relief process of the press is to start pressure relief from the oil pressure of 100MPa, and when the pressure is reduced to below 6MPa, the pressure relief work is finished, and the press is switched to return stroke action. Because the pressure change is very large in the pressure relief process of the press, the damping hole with proper pressure relief speed is provided at high pressure, and the pressure relief speed is too slow at low pressure.
In order to solve the problem of uniform pressure release speed, as shown in fig. 1, 4 throttle valves 14 with different damping and hydraulic reversing valves 15 corresponding to the throttle valves one to one are installed in a hydraulic system at present, the throttle valves 14 are controlled to be opened and closed through the hydraulic reversing valves 15, and along with the reduction of the pressure of the hydraulic system in the pressure release process, 4 pressure release valves with different damping sizes are gradually opened to ensure that the pressure release speed is close to be consistent. However, the pressure difference change is large when the 4 pressure release valves are switched, so that the pressure release process requirement for synthesizing high-grade diamond cannot be met. And the volume and the weight of the conventional ultrahigh pressure relief valve are large, the influence of oil cleanliness is large, the structure is also complex, and certain difficulty is caused in use, installation, adjustment and maintenance of customers. In summary, the pressure relief system in the existing hydraulic system has the problem of large pressure difference change in the pressure relief process.
Disclosure of Invention
The invention aims to provide a throttle valve, which is used for solving the problem that the pressure difference of a pressure relief system in the prior art is greatly changed in the pressure relief process; the invention also aims to provide a pressure relief system, which is used for solving the problem of large pressure difference change in the pressure relief process of the pressure relief system in the prior art.
In order to achieve the purpose, the throttle valve has the technical scheme that:
the throttle valve comprises a valve body, the valve body includes pressure release entry, pressure release export and the interface channel of intercommunication pressure release entry and pressure release export, be equipped with the throttle lever in the interface channel, the throttle lever disposes control cylinder, fixed connection between control cylinder' S piston part and the throttle lever, establish as an organic whole or press-fit with the throttle lever top when the throttle valve pressure release, control cylinder forms the control oil pocket in one side that piston part deviates from the throttle lever, and the control oil pocket is connected with the oiling valve, and the control oil pocket still is connected with the constant volume oil pocket through two three way valve, and two three way valve are the solenoid valve, and its P mouth is connected with control cylinder, and A mouth is connected with the constant volume oil pocket, be equipped with the oil extraction piston in the constant volume oil pocket, and the oil extraction elastic component is equipped with on one side top that deviates from the constant volume oil pocket oil inlet of oil extraction piston, can get into the oil mass in the constant volume oil pocket and be V, and set for the stroke of expe.
The invention has the beneficial effects that: the control three-way valve is communicated with the control oil cavity and the constant volume oil cavity, the throttle rod pushes the control piston in the control oil cylinder under the pressure of high-pressure liquid in the connecting channel, oil distributing liquid in the control oil cavity flows into the constant volume oil cavity, the control piston and the throttle rod move towards the direction of the pressure applied to the throttle rod, namely, the control piston and the throttle rod move towards the direction of reducing the liquid resistance in the throttle valve, the pressure relief speed of the throttle valve is increased, then the two-position three-way valve can be controlled, the port A is communicated with the other connecting port, oil in the constant volume oil cavity is discharged, one-time pressure relief adjustment is completed, and then the next-time pressure relief adjustment can be carried. When the volume of the constant volume oil cavity and the sectional area of the control oil cavity are smaller, the control piston moves in a micro-step mode, so that the liquid resistance is slightly reduced, and pressure relief can be completed with smaller pressure difference change by continuously controlling the two-position three-way valve.
Furthermore, in order to reduce the pressure in the control oil cavity and the constant volume oil cavity, the piston component comprises a small-diameter section close to the throttle rod part and a large-diameter section far away from the throttle rod part, a rod cavity is formed on one side of the piston component back to the control oil cavity after the piston component moves towards the control oil cavity, and the rod cavity is connected with a pressure balance hole.
Furthermore, in order to change the volume of the constant volume oil chamber, an adjusting screw rod for changing the stroke of the oil discharge piston is arranged in the constant volume oil chamber, the axis of the adjusting screw rod is overlapped with the axis of the oil discharge piston, and the oil discharge piston can be stopped at different positions by changing the length of the adjusting screw rod screwed into the constant volume oil chamber, so that the stroke of the oil discharge piston is changed.
Furthermore, in order to fix the control oil cylinder on the main body part, the control oil cylinder is connected to the main body part through a flange, and the flange is used for fixing simply and conveniently.
Furthermore, in order to facilitate the oil injection operation, the oil injection valve is a one-way valve which is communicated from a valve port to the control oil passage in a one-way mode.
In order to achieve the purpose, the technical scheme of the pressure relief system is as follows:
pressure relief system includes the choke valve, sensor and control circuit, and control circuit includes P L C, and the choke valve includes the valve body, the valve body includes pressure release entry, pressure release export and intercommunication pressure release entry and the interface channel of pressure release export, be equipped with the throttle lever in the interface channel, the throttle lever disposes control cylinder, fixed connection between control cylinder' S piston part and the throttle lever, establish as an organic whole or press-fit with the throttle lever top when the throttle valve pressure release, control cylinder forms the control oil pocket in one side that piston part deviates from the throttle lever, and the control oil pocket is connected with the oiling valve, and control cylinder still is connected with the constant volume oil pocket through two three-way valves, and two three-way valves are the solenoid valve, and its P mouth is connected with control cylinder, and A mouth and constant volume oil pocket are connected, be equipped with oil extraction piston in the constant volume oil pocket, and oil pocket can get into V in the constant volume oil pocket, and set for the stroke of expecting control piston action at every turn is L, and the sectional area of control oil pocket is S, then V is L S, sensor and two-way valves are all connected with control circuit, and the pressure release sensor L C detects the pressure change rate, thereby the three-way valve control system moves the change rate circumstances of control system.
The invention has the advantages that the control three-way valve is communicated with the control oil cavity and the constant volume oil cavity, the throttle rod pushes the control piston in the control oil cylinder under the pressure of high-pressure liquid in the connecting channel, the oil distribution liquid in the control oil cavity flows into the constant volume oil cavity, the control piston and the throttle rod move towards the direction of the pressure applied to the throttle rod, namely move towards the direction of reducing the hydraulic resistance in the throttle valve, the pressure relief speed of the throttle valve is increased, then the two-way valve can be controlled, the port A is communicated with the other port, the oil in the constant volume oil cavity is discharged, one-time pressure relief adjustment is completed, then the next pressure relief adjustment can be performed after the port A and the port P are communicated, when the volume of the constant volume oil cavity and the sectional area of the control oil cavity are smaller, the control piston moves in a micro stepping mode, the hydraulic resistance is slightly reduced, the pressure relief can be completed by continuously controlling the two ports of the three-way valve, the pressure relief can be changed by smaller pressure difference change after the throttle valve is connected with the control circuit, the P L C controls the on-off.
Furthermore, in order to reduce the pressure in the control oil cylinder, a small-diameter section close to the throttle rod part and a large-diameter section far away from the throttle rod part are formed, a rod cavity is formed on one side of the piston part, which is back to the control oil cavity, and the rod cavity is connected with a pressure balance hole.
Furthermore, in order to change the volume of the constant volume oil chamber, an adjusting screw rod for changing the stroke of the oil discharge piston is arranged in the constant volume oil chamber, the axis of the adjusting screw rod is overlapped with the axis of the oil discharge piston, and the oil discharge piston can be stopped at different positions by changing the length of the adjusting screw rod screwed into the constant volume oil chamber, so that the stroke of the oil discharge piston is changed.
Furthermore, in order to fix the control oil cylinder on the main body part, the control oil cylinder is connected to the main body part through a flange, and the flange is used for fixing simply and conveniently.
Furthermore, in order to facilitate the oil injection operation, the oil injection valve is a one-way valve which is communicated from a valve port to the control oil passage in a one-way mode.
Drawings
FIG. 1 is a schematic diagram of a prior art pressure relief system;
FIG. 2 is a schematic diagram of a throttle valve in an embodiment of the pressure relief system of the present invention;
FIG. 3 is a hydraulic schematic of a throttle valve in an embodiment of the pressure relief system of the present invention.
In the figure: 1. an upper end cover; 2. a thick-walled cylinder barrel; 3. a filter element; 4. a bolt; 5. a lower end cover; 6. a throttle lever; 7. a control piston; 8. controlling the oil cylinder; 9. a constant volume oil cavity; 10. an oil drain piston; 11. adjusting the screw rod; 12. a one-way valve; 13. an electromagnetic ball valve; 14. a throttle valve; 15. a reversing valve.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The pressure relief system comprises a throttle valve, a sensor and a control circuit, wherein the control circuit comprises P L C, as shown in FIG. 2, the throttle valve comprises a main body part and a control part, the main body part is communicated with the pressure relief system, the main body part comprises an upper end cover 1, a thick-wall cylinder barrel 2, a filter element 3, a bolt 4 and a lower end cover 5, the upper end cover 1 and the lower end cover 5 are arranged at two ends of the thick-wall cylinder barrel 2, the thick-wall cylinder barrel 2 is clamped and sealed by the upper end cover 1 and the lower end cover 5 through the bolt 4, the upper end cover 1 is provided with a pressure relief oil inlet arranged along the axial direction of the thick-wall cylinder barrel 2, the lower end cover 5 is provided with a pressure relief oil outlet formed by an axial section arranged along the axial direction of the thick-wall cylinder barrel 2 and a radial section communicated with the axial section, the pressure relief oil inlet, the pressure relief oil outlet and the inner cavity of the thick-wall cylinder barrel 2 are communicated together to form a communication channel, the inner cavity of the thick-wall cylinder barrel 2 is provided with the filter element 3 for ensuring that oil flowing through the.
A throttling rod 6 which is precisely matched with the axial section of the pressure relief oil outlet hole of the lower end cover 5 and can move is arranged in the pressure relief oil outlet hole, and a triangular oil groove is formed in the throttling rod 6 and used for changing a throttling gap. The lower end face of the lower end cover 5 is provided with a control oil cylinder 8, the control oil cylinder 8 is fixed on the main body part through a flange, a control piston 7 is arranged in the control oil cylinder 8, and a piston rod of the control piston 7 is the same as the outer diameter of the throttle rod 6 and is in press fit with the throttle rod 6. The control oil cylinder 8 forms a control oil cavity on one side of the piston component departing from the throttle rod 6, a second pressure balance hole which is communicated with a rod cavity of the control piston 7 departing from the control oil cavity is arranged on the lower end cover 5 and is marked as T2, and the second pressure balance hole is communicated with the outside atmosphere. The pressure relief rate of the pressure relief system is controlled by controlling the movement of the piston 7, namely changing the matching length of the throttle rod 6 in the oil hole of the lower end cover 5, and further adjusting the hydraulic resistance.
The control oil cylinder 8 is also internally provided with a constant volume oil chamber 9 with a small volume, an oil discharge piston 10 is arranged in the constant volume oil chamber 9, the constant volume oil chamber 9 is divided into two chambers by the piston, and an adjusting oil duct is communicated in one chamber. In order to enable the piston in the constant volume oil cavity 9 to automatically reset, a reset spring is arranged in a cavity communicated with the adjusting oil passage, an adjusting screw rod 11 capable of controlling the stroke of the oil discharging piston is arranged in the other cavity, a first pressure balance hole, which is marked as T1, is arranged in the cavity, and the air pressure in the constant volume oil cavity 9 can be balanced through a vent hole. The adjusting screw 11 is arranged along the axis of the constant volume oil chamber 9, and the oil discharge piston 10 can be stopped at different positions by screwing the adjusting screw 11 to adjust the length of the screw in the constant volume oil chamber 9, so that the amount of oil flowing from the control oil chamber to the constant volume oil chamber 9 at each time can be adjusted.
An electromagnetic ball valve 13 is installed on the end face of the bottom of the cylinder barrel, the electromagnetic ball valve is a two-position three-way valve, the electromagnetic ball valve 13 is provided with an opening A, an opening P and an opening T, the opening P is connected with the control oil cylinder 8 through a control oil duct, the opening A is connected with the constant volume oil cavity 9 through an adjusting oil duct, and the opening T is connected with T1 and T2 and then is led into an external oil tank. The electromagnetic ball valve 13 can realize two actions of communicating the port A and the port P and communicating the port A and the port T.
In the embodiment, the control oil cylinder is also provided with a one-way valve 12, the port of the one-way valve 12 communicated with the outside is an X port, and the one-way valve is communicated with the control oil cavity outlet of the control oil cylinder 8 and can only be opened to the control oil cavity outlet in a one-way mode. When the electromagnetic ball valve 13 is communicated with the port A and the port T, a worker can fill oil into the control oil cylinder 8 through the check valve 12.
Before the pressure of the press is increased, system control oil enters the control oil cylinder 8 from an X port through the check valve 12, the control piston 7 and the throttle rod 6 are pushed to move upwards to the maximum closing position and then stop, and the throttle valve has the maximum damping. When the press is pressurized and pressure-maintaining, high-pressure oil reaches the pressure relief oil outlet of the lower end cover 5 through the P1 port of the upper end cover 1 and the filter element 3, and the high-pressure oil is loaded on the upper end surface of the throttle rod 6 to generate thrust F ═ PH ═ S1(PH is pressure of high pressure oil, S)1The axial end area of the throttle lever 6), the thrust is transmitted via the throttle lever 6 and the control piston 7, which is pressed coaxially thereto, to the bottom-generating oil pressure P L ═ F/S2(S2To control the area of the bottom end of the piston 7). Since the electromagnetic ball valve 13 and the check valve 12 are closed at this time, the control piston 7 is kept stationary. When the pressure of the press is relieved, the two-way valve is opened, high-pressure oil enters the throttle valve through the port P1, is reduced in pressure and then returns to the oil tank through the two-way valve from the outlet P2. Along with the reduction of system pressure PH, pressure release flow Q ═ PH/R can slow down, for keeping pressure release rate stable, adjusts corresponding liquid resistance R through the choke valve.
Firstly, the control system opens the electromagnetic ball valve 13, the control piston 7 pushes the oil in the lower cavity to enter the constant volume oil cavity 9 through the electromagnetic ball valve 13 under the action of high-pressure oil pressure F, the oil discharge piston 10 is pushed to move to contact with the adjusting screw rod and then stop, and the moving distance is L3The oil quantity entering the cavity 9 of the constant volume oil cavity is Q3＝S3*L3The distance L of downward movement of the piston 7 and the throttle lever 6 is controlled2＝Q3/S2＝(S3/S2)*L3＝(D3/D2)2*L3. (Note: D)2，S2And D3，S3The diameters and the areas of the control piston 7 and the constant volume oil chamber 9 are respectively. ) Due to D2，D3The diameter difference is large, so that the control piston 7 makes micro stepping movement, the electromagnetic ball valve 13 is powered off and reset by the P L C, the constant volume piston moves back under the action of the spring to push oil in the cavity out of the oil tank from the port A of the electromagnetic ball valve 13 to the port T, and the control piston 7 and the throttle rod 6 move a fixed distance L in a stepping manner once each time the electromagnetic ball valve 13 is opened and closed by the P L C2P L C detects the pressure change condition of the press system through the pressure sensor to control the on-off frequency of the electromagnetic ball valve 13, and continuously changes the liquid resistance R to keep the pressure release rate constant or track the set pressure curve, namely, the pressure release rate is adjusted according to the requirement.
In other embodiments, the elastic member in the constant volume oil chamber may be a disc spring when the piston in the constant volume oil chamber is formed to be shorter; in other embodiments, under the condition that the volume of the constant volume oil chamber is small and the volume of the piston does not need to be changed, the adjusting screw rod is not required to be arranged in the constant volume oil chamber; in other embodiments, the control cylinder may also be secured to the main body portion by a threaded connection; in other embodiments, the throttle lever and the control piston may be integrated or fixedly connected; in other embodiments, the fill valve may also be an on-off valve; in other embodiments, the piston member may be a rod-like structure of constant diameter, in which case there is no rod chamber in the control cylinder. The system to be depressurized in this embodiment is a press system, and in other embodiments, the system to be depressurized may also be applied to other systems for depressurization.
In the specific embodiment of the throttle valve in this embodiment, the structure of the throttle valve in this embodiment is the same as that of the throttle valve in the pressure relief system, and details are not repeated.
Claims (10)
1. The throttle valve comprises a valve body, the valve body comprises a pressure relief inlet, a pressure relief outlet and a connecting channel for communicating the pressure relief inlet and the pressure relief outlet, the connecting channel is provided with a throttle rod, and the throttle rod is provided with a control oil cylinder, a piston part of the control oil cylinder is fixedly connected with the throttle rod, integrated or press-fitted with the top of the throttle rod during pressure relief of the throttle valve, the control oil cylinder forms a control oil cavity on one side of the piston part departing from the throttle rod, the control oil cavity is connected with an oil filling valve, the control oil cylinder is further connected with a constant volume oil cavity through a two-position three-way valve, the two-position three-way valve is an electromagnetic valve, a port P of the electromagnetic valve is connected with the control oil cylinder, a port A is connected with the constant volume oil cavity, an oil discharge piston is arranged in the constant volume oil cavity, an oil discharge elastic part is arranged on one side of the oil discharge piston departing from an oil inlet of the constant volume oil cavity, the oil quantity which can.
2. The throttling valve of claim 1, wherein: the piston component comprises a small-diameter section close to the throttle rod part and a large-diameter section far away from the throttle rod part, a rod cavity is formed in one side, back to the control oil cavity, of the piston component after the piston component moves towards the control oil cavity, and the rod cavity is connected with a pressure balance hole.
3. The throttling valve of claim 1, wherein: and an adjusting screw rod for changing the stroke of the oil discharging piston is arranged in the constant volume oil cavity, and the axis of the adjusting screw rod is overlapped with the axis of the oil discharging piston.
4. The throttling valve according to claim 1 or 2, wherein: and the control oil cylinder is connected to the valve body through a flange.
5. The throttling valve according to claim 1 or 2, wherein: the oil injection valve is a one-way valve which is communicated from a valve port to the control oil cavity in a one-way mode.
6. The pressure relief system comprises a throttle valve, a sensor and a control circuit, wherein the control circuit comprises a P L C, the throttle valve comprises a valve body, the valve body comprises a pressure relief inlet, a pressure relief outlet and a connecting channel for communicating the pressure relief inlet with the pressure relief outlet, and a throttle rod is arranged in the connecting channel.
7. The pressure relief system of claim 6, wherein: the piston component comprises a small-diameter section close to the throttle rod part and a large-diameter section far away from the throttle rod part, a rod cavity is formed in one side, back to the control oil cavity, of the piston component after the piston moves towards the control oil cavity, and the rod cavity is connected with a pressure balance hole.
8. The pressure relief system according to claim 7, wherein: and an adjusting screw rod for changing the stroke of the oil discharging piston is arranged in the constant volume oil cavity, and the axis of the adjusting screw rod is overlapped with the axis of the oil discharging piston.
9. The pressure relief system according to claim 6 or 7, wherein: and the control oil cylinder is connected to the valve body through a flange.
10. The pressure relief system according to claim 6 or 7, wherein: the oil injection valve is a one-way valve which is communicated from a valve port to the control oil cavity in a one-way mode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811361026.3A CN109611399B (en) | 2018-11-15 | 2018-11-15 | Throttle valve and pressure relief system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811361026.3A CN109611399B (en) | 2018-11-15 | 2018-11-15 | Throttle valve and pressure relief system |
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| Publication Number | Publication Date |
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| CN109611399A CN109611399A (en) | 2019-04-12 |
| CN109611399B true CN109611399B (en) | 2020-07-14 |
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| CN201811361026.3A Active CN109611399B (en) | 2018-11-15 | 2018-11-15 | Throttle valve and pressure relief system |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110433733B (en) * | 2019-08-28 | 2023-05-16 | 郑州中南杰特超硬材料有限公司 | Automatic protection system for synthesizing nano polycrystalline diamond |
| CN112268751B (en) * | 2020-10-21 | 2024-01-19 | 朱红璋 | Petroleum exploitation sample oil layer sampling equipment |
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|---|---|---|---|---|
| CN1109145A (en) * | 1994-08-29 | 1995-09-27 | 张智远 | Hydraulic system of superpressure press for making artifitial diamond |
| CN202707664U (en) * | 2012-08-18 | 2013-01-30 | 山西金开源实业有限公司 | Ultrahigh pressure unloading speed regulation device |
| JP2015090156A (en) * | 2013-11-05 | 2015-05-11 | 株式会社コガネイ | Control valve |
| CN104747523A (en) * | 2015-04-02 | 2015-07-01 | 武汉船用机械有限责任公司 | Releasing speed restriction hydraulic control valve |
| CN105370977A (en) * | 2015-12-07 | 2016-03-02 | 浙江海洋学院 | Throttle valve for ship |
| CN105889159A (en) * | 2016-04-25 | 2016-08-24 | 天津优瑞纳斯智能装备有限公司 | Hydraulic system with ultra-high pressure outputting capacity |
| CN206309679U (en) * | 2016-12-13 | 2017-07-07 | 四川航空工业川西机器有限责任公司 | Super high pressure fluid unloading valve |
-
2018
- 2018-11-15 CN CN201811361026.3A patent/CN109611399B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1109145A (en) * | 1994-08-29 | 1995-09-27 | 张智远 | Hydraulic system of superpressure press for making artifitial diamond |
| CN202707664U (en) * | 2012-08-18 | 2013-01-30 | 山西金开源实业有限公司 | Ultrahigh pressure unloading speed regulation device |
| JP2015090156A (en) * | 2013-11-05 | 2015-05-11 | 株式会社コガネイ | Control valve |
| CN104747523A (en) * | 2015-04-02 | 2015-07-01 | 武汉船用机械有限责任公司 | Releasing speed restriction hydraulic control valve |
| CN105370977A (en) * | 2015-12-07 | 2016-03-02 | 浙江海洋学院 | Throttle valve for ship |
| CN105889159A (en) * | 2016-04-25 | 2016-08-24 | 天津优瑞纳斯智能装备有限公司 | Hydraulic system with ultra-high pressure outputting capacity |
| CN206309679U (en) * | 2016-12-13 | 2017-07-07 | 四川航空工业川西机器有限责任公司 | Super high pressure fluid unloading valve |
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| CN109611399A (en) | 2019-04-12 |
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