CN201672063U - Manual pressurization control system for mechanical seal - Google Patents
Manual pressurization control system for mechanical seal Download PDFInfo
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- CN201672063U CN201672063U CN2010202183447U CN201020218344U CN201672063U CN 201672063 U CN201672063 U CN 201672063U CN 2010202183447 U CN2010202183447 U CN 2010202183447U CN 201020218344 U CN201020218344 U CN 201020218344U CN 201672063 U CN201672063 U CN 201672063U
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Abstract
The utility model relates to a manual pressurization control system for mechanical seal. The valve body of a manual pressurization pump is integratedly connected with a housing by screws, then put into a fuel tank, the screws and the fuel tank are integratedly assembled into a hydraulic power system source, an oiling plunger is mounted on the fuel tank, an internal pressure ring connected with the manual pressurization pump is mounted in the fuel tank, a sealing pad is arranged between the internal pressure ring and the fuel tank, the fuel tank is provided with a concave type space, the tank body of a pressure tank is provided with a manual pressurization pump sealing liquid inlet, a sealing liquid inlet, and a sealing liquid outlet, and is provided with a liquid level switch and a pressure switch, the top part is provided with a filling inlet and an emptying valve outlet or a torch connection, the upper part is provided with a visor, the inner bottom part is provided with a cooling coil, the bottom is provided with a cold water inlet, a cold water outlet and a pollution discharge port, and a sealing piece is provided with a mechanical seal with a pump efficiency ring by back to back to form a closed sealing cavity. The utility model adopts that the manual pressurization pump and the fuel tank are integratedly assembled to form the hydraulic power system source, which is suitable for the mechanical sealing products in petroleum industry, chemical industry, and the like.
Description
Technical field
The utility model belongs to the mechanical encapsulation devices field, relates to a kind of mechanical seal manual pressure control system, is particularly suited for the mechanical seal product of enterprises such as oil, chemical industry.
Background technique
The control pressurer system of mechanical seal uses usually in the double seals place, double seals can be the fast double seals of string, it also can be back-to-back installation double seals, if adopt back-to-back installation double seals, sealing liquid pressure should be higher than the pump pressure medium in the pressurized tank, this guarantees that with regard to requiring pressurized tank must be equipped with the device that has the peripheral hardware pressure source pressure in the pressurized tank often is controlled in the scope of requirement, and adopt nitrogen bottle (being full of pressure nitrogen gas in the bottle) to link to each other at present usually with pressurized tank, regulate nitrogen pressure with pressure regulator, to guarantee the pressure in the pressurized tank.It is bigger that but this covering device occupies the space, is placed on usually away from main frame and pressurized tank place, links to each other with pressurized tank with high pressure hose, and it is extremely inconvenient to operate, and it is also cumbersome to change nitrogen bottle and pressure regulator adjusting nitrogen pressure value.
Summary of the invention
Problem to be solved in the utility model is, overcome the deficiencies in the prior art, a kind of mechanical seal manual pressure control system is provided, manual pressure pump and fuel tank are assembled into one, form the hydraulic power system source, the double mechanical seal of back-to-back installation, form the Seal cage of a sealing, with the pump efficiency ring of mechanical seal with the speed rotation, buffer fluid (work sealing liquid) is delivered to pressurized tank, realized the circulation of buffer fluid (work sealing liquid), buffer fluid (work sealing liquid) is taken away the heat that mechanical seal produces, and lubricated effect has been played in mechanical seal.
The utility model solves its technical problem and takes following technological scheme to realize:
A kind of mechanical seal manual pressure control system that provides according to the utility model, comprise the manual pressure pump, fuel tank, pressurized tank and Sealing, described manual pressure pump 1 comprises valve body 5, shell 6, plunger case 7, plunger 8, spring seat 9,10,11, oil extraction valve seat 12, the oil suction valve seat 13 and the bar 14 of draining the oil, bearing pin frame 15, operating grip 16 and bearing pin 17, valve body linked into an integrated entity with screw and shell pack in the fuel tank 2, be assembled into one with screw and fuel tank again and form the hydraulic power system source, outer casing bottom leaves exhaust port 30, one side of valve body leaves flow-off 31, drain the oil and pressure release screw 32 is housed on the bar, pressure regulating screw 33 is housed on the spring seat 10; Oiling plunger 18 is housed on the fuel tank, the inner pressure ring 19 that is connected with the manual pressure pump is housed in the fuel tank, sealing gasket 20 is housed between inner pressure ring and the fuel tank, fuel tank is provided with indent formula space 21; Fuel tank and pressurized tank 3 are packed in respectively on the supporting frame 4; Leave manual pressure pump sealing liquid import 23, sealing liquid import 24, sealing liquid outlet 25 on the tank body 22 of pressurized tank, liquid-level switch 26A and pressure switch 26B are housed respectively on the tank body, pressure switch connects pressure gauge 39, leave filler 27 and emptying valve export or torch interface 38 respectively at the tank body top, in the tank body middle and upper part visor 40 is housed, at the tank body inner bottom part cooling coil 34 is housed, tank base leaves cooling water inlet 36, cooling water outlet 37 and sewage draining exit 35 respectively; The back-to-back mechanical seal 29 that the band pump efficiency ring is installed on the Sealing 28, the Seal cage of a sealing of formation.
The utility model compared with prior art has significant advantage and beneficial effect:
Because model utility adopts the manual pressure pump, advantages of compact and light structure, volume is little, and is in light weight, and valve body and shell etc. all is designed to solid of rotation, brings convenience to manufacturing, and the profile exquisiteness is attractive in appearance, and is with low cost etc.Manual pressure pump and fuel tank are assembled into one and form the hydraulic power system source.The double mechanical seal of back-to-back installation forms the Seal cage of a sealing, with the pump efficiency ring of mechanical seal with the speed rotation, buffer fluid (work sealing liquid) is delivered to pressurized tank, realized the circulation of buffer fluid (work sealing liquid), buffer fluid (work sealing liquid) is taken away the heat that mechanical seal produces, and lubricated effect has been played in mechanical seal.The application area of this SYS Ex system expanding mechanical seal when reaching the limit of as the serviceability temperature of mechanical seal, is provided with cooling coil in the pressurized tank, be equivalent to a small-sized cooler, temperature can be lowered, and arrives within the permission Applicable temperature of mechanical seal.This system enhancement the lubrication circumstances of mechanical seal, dirt etc. wearing and tearing material can be got rid of from pressurized tank bottom blowdown valve and pipeline bottom liquid discharging valve.The waste material foreign material just are difficult to be deposited near the friction pair, avoid wearing and tearing, improve running life.Of paramount importance is to guarantee safety in production, the protection environment.Particularly in petrochemical enterprise, reliable to guaranteeing equipment operation, device is produced continuously and is significant.In petrochemical enterprise, handled stream (gas, liquid) great majority have corrosivity in the body, combustibility, explosion hazard and toxicity, in case mechanical seal was lost efficacy, dielectric leakage, not only befouling environment influences health and quality of product, but also can cause fire, major accidents such as blast and personal injury.Therefore, not only the visual leak of liquid of naked eyes to be noted and avoid, also not visible gas leakage should be avoided.This point obtains to properly settle in the utility model, and this system can accomplish to protect environment to avoid environmental pollution.
Embodiment of the present utility model is provided in detail by following examples and accompanying drawing thereof.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is a manual pressure pump work schematic diagram of the present utility model;
Fig. 3 is a manual pressure pump master TV structure schematic representation of the present utility model;
Fig. 4 overlooks cross-sectional view for manual pressure pump of the present utility model;
Fig. 5 is a fuel tank master TV structure schematic representation of the present utility model;
Fig. 6 is the right TV structure schematic representation of fuel tank of the present utility model;
Fig. 7 is a fuel tank plan structure schematic representation of the present utility model;
Fig. 8 is manual pressure pump of the present utility model and fuel tank assembly structure schematic representation;
Fig. 9 is a pressurized tank master TV structure schematic representation of the present utility model;
Figure 10 is the right TV structure schematic representation of pressurized tank of the present utility model.
Wherein: 1, manual pressure pump 2, fuel tank 3, pressurized tank 4, supporting frame 5, valve body 6, shell 7, plunger case 8, plunger 9,10,11, spring seat 12, oil extraction valve seat 13, oil suction valve seat 14, the bar 15 of draining the oil, bearing pin frame 16, operating grip 17, bearing pin 18, oiling plunger 19, inner pressure ring 20, sealing gasket 21, indent formula space 22, tank body 23, hand compression pump sealing liquid import 24, sealing liquid import 25, sealing liquid outlet 26A, liquid-level switch 26B, pressure switch 27, filler 28, Sealing 29, the mechanical seal 30 of band pump efficiency ring, exhaust port 31 flow-offs 32, pressure release screw 33, pressure regulating screw 34, cooling coil 35, sewage draining exit 36, cooling water inlet 37, cooling water outlet 38, emptying valve export or torch interface 39, pressure gauge 40, visor 41, motor 42, impeller 43, drain valve
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, embodiment, structure, feature and effect thereof that foundation the utility model is provided, describe in detail as after.
A kind of mechanical seal manual pressure control system shown in Fig. 1～10, comprise the manual pressure pump, fuel tank, pressurized tank and Sealing, described manual pressure pump 1 comprises valve body 5, shell 6, plunger case 7, plunger 8, spring seat 9,10,11, oil extraction valve seat 12, the oil suction valve seat 13 and the bar 14 of draining the oil, bearing pin frame 15, operating grip 16 and bearing pin 17, valve body linked into an integrated entity with screw and shell pack in the fuel tank 2, be assembled into one with screw and fuel tank again and form the hydraulic power system source, outer casing bottom leaves exhaust port 30, one side of valve body leaves flow-off 31, drain the oil bar on pressure release screw 32 is housed, pressure regulating screw 33 is housed on the spring seat 10.The manual pressure pump is the reciprocating plunger pump of single plunger, its to-and-fro motion is by manually pulling operating grip, and the opening and closing by oil extraction valve seat and oil suction valve seat, constantly sealing liquid is sucked through fuel tank, enter pressurized tank through the manual pressure pump through the sealing liquid outlet, the dwell pressure of this pump is adjustable, when surpassing the force value of adjusting, sealing liquid flows back to fuel tank through the aperture of valve body, when the needs pressure release, sealing liquid flows back to fuel tank through the aperture of shell, and each joint all seals with rubber o-ring.
Oiling plunger 18 is housed on the fuel tank, the inner pressure ring 19 that is connected with the manual pressure pump is housed in the fuel tank, sealing gasket 20 is housed between inner pressure ring and the fuel tank, fuel tank is provided with indent formula space 21; Fuel tank and pressurized tank 3 are packed in respectively on the supporting frame 4.Fuel tank is a rectangular box, back out and add oil filler plug and can in fuel tank, inject sealing liquid, the inner pressure ring that this fuel tank is connected with the manual pressure pump, be pre-installed in the fuel tank, socket head screw and the fuel tank that is screwed into two M6 on the inner pressure ring in two uniform Φ 6.5 holes fixed (can not twist dead do location with), 8 the blind silk of M6 holes (blind silk hole is by the inner wall of oil tank side) are attacked in pre-subdrilling on inner pressure ring simultaneously, are used for the manual pressure pump is fixed on the fuel tank.On support, convenient installation and cleaning are inner with 190 * 190 foursquare four screw in the installation of this fuel tank.
Leave manual pressure pump sealing liquid import 23, sealing liquid import 24, sealing liquid outlet 25 on the tank body 22 of pressurized tank, liquid-level switch 26A and pressure switch 26B are housed respectively on the tank body, pressure switch connects pressure gauge 39, leave filler 27 and emptying valve export or torch interface 38 respectively at the tank body top, in the tank body middle and upper part visor 40 is housed, at the tank body inner bottom part cooling coil 34 is housed, tank base leaves cooling water inlet 36, cooling water outlet 37 and sewage draining exit 35 respectively.Pressurized tank is Φ 159 seamless steel pipes, two ends are Φ 159 bumped heads, these two are welded, during welding the cooling coil of inside is packed in advance, the welding back gets out connecting tube and uses the hole on pressurized tank, weld connecting tube then, assorts its mesoscope of whole links: in the pressurized tank middle and upper part, be exactly the position of sealing liquid liquid level, be used for direct observation sealing liquid liquid level.Cooling coil: the heat exchange area of coil pipe is 0.15M
2, its effect is to provide cooled sealing liquid to mechanical seal, and is especially even more important to the high working environment of temperature, if adopt thermal siphon, the sealing liquid that is cooled helps to strengthen the thermal siphon effect.Pressure switch and liquid-level switch: be the outsourcing accessory; sealing or external sealed leakage failure in being used for monitoring, when the pressure reduction or the liquid level reduction of sealing liquid, this switch will be activated and trigger alarm or make equipment downtime; liquid-level switch also can be installed high level switch, and effect is with last identical.Assort whole pipe fittings on the pressurized tank, pressure gauge is housed observes a jar internal pressure, blowdown valve is equipped with in the pressurized tank bottom, irregular eliminating jar interior assorted slag, atmospheric valve is equipped with at the top of pressurized tank, the torch of when needs poisonous, flammable and explosive substance emptying maybe directly being started to exchange fire this atmospheric valve makes its burning, and this pressurized tank volume is designed to 2 gallons, and it is very reasonable that 2 gallons pressurized tank and manual pressure pump and fuel tank (two are miniature) are complementary.
The back-to-back mechanical seal 29 that the band pump efficiency ring is installed on the Sealing 28, the Seal cage of a sealing of formation.Sealing is the service object of manual pressure control system.The Sealing of this system overlaps the back-to-back mechanical seal that band pump efficiency ring (generally being atmosphere end band pump efficiency ring) is installed with two.Sealing is fabricated to the Seal cage that unit loading type forms a sealing.High pressure sealing liquid, lubricated and pump medium are housed in the Seal cage, 42 rotations of motor 41 impeller, buffer fluid (sealing liquid) is flowed out by pressurized tank and enters Seal cage, is equipped with in the pipeline and drains valve 43, and buffer fluid (sealing liquid) enters pressurized tank by Seal cage.
Working principle:
Manual pressure pump (seeing Fig. 2,3,4): when pulling operating grip 16 repeatedly, make plunger 8 to-and-fro motion in the shell 6, the sealing liquid (buffer fluid) of will working constantly is pressed onto active chamber by exhaust port 30.When load surpassed rated pressure, the work sealing liquid was through flow-off 31 excessive oil sump tanks, thus acquisition overload protection, active chamber constant pressure at this moment.Can stop to pull operating grip this moment and constitute packing state.When finding that pressure reduces after a while, pull operating grip once more, when making it reach rated pressure, stop to pull operating grip.When active chamber needs pressure release, pressure release screw 32 is unscrewed the work sealing liquid of making flow back to pressure release in the fuel tank active chamber.When needing pressurization the pressure release screw is screwed, pull operating grip and make its pressurization, pressure regulating screw 33 can be regulated the pressure of active chamber at any time.
Pressure spring forces plunger 8 to move right when pulling operating grip 16, the sealing liquid of will working is pressed onto in the active chamber, when unclamping Joystick, spring force is moved to the left plunger plunger 8 jack-up, be vacuum this moment in the plunger case, oil extraction valve seat 12 is closed, and oil suction valve seat 13 is opened, and the work sealing liquid enters in the clutch release slave cylinder.Pulling the operating grip pressure spring once more forces plunger to move right, and--the work sealing liquid enters active chamber, and--unclamping Joystick spring jack-up plunger is moved to the left, and----draining valve cuts out--oil sucting valve is opened--, and the work sealing liquid enters in the plunger case vacuum in the plunger case.Pull repeatedly Joystick when reaching the rated pressure value till.
Work sealing liquid during the design of this pump is only limit: use oils (sealing liquid is an oil when ordering goods for the first time), so select carbon steel for use during the design of the stock of pump, along with the expansion of application area, pump uses stock can also use stainless steel (304,316 etc.).Sealing material can be used materials such as fluorine rubber, teflon and bag fluorine circle by present nitrile rubber.The application of this pump will have more wide development, and will be the same with other products, select for use different stocks and auxiliary material to satisfy different operation technique requirements according to the working condition requirement of work sealing liquid.Manual pressure pump technical parameter: the every stroke of nominal discharge capacity: 4ml/, rated pressure: 2.5Mpa, range of regulation: 0-2.5Mpa.
Fuel tank is a rectangular box (seeing Fig. 5,6,7), backs out oiling plunger 18 and can annotate the work sealing liquid in fuel tank.The inner pressure ring 19 that one of design feature of this fuel tank is connected with the manual pressure pump gives and being contained in the fuel tank.Be screwed into 2 M6 socket head screws in 2 uniform Φ 6.5 holes on the inner pressure ring and fuel tank is fixed (can not twist extremely do location with), give simultaneously boring on inner pressure ring and attack 8 the blind silk of M6 holes (blind silk hole is by the oil tank wall inboard), it is used for the manual pressure pump is fixed on the fuel tank.Inner pressure ring endoporus Φ 75 and manual pressure pump corresponding size coupling, and hand can be stretched into the fuel tank operation just in Φ 75 holes.As the glaze thermometer.The sealing gasket sealing is arranged between inner pressure ring and the fuel tank, can in Φ 75 holes, pack into during assembling.Fuel tank is provided with dark 30 spaces of indent formula 40X115, is used for installing glass-stem thermometer and uses (thermometer is not shown).Can prevent like this that the glass meter from exposing is broken, safe and reliable.Fuel tank is installed with 4 bolt easy cleanings of 190X190 square, is put clean work sealing liquid.Still hang on the bolt and sealing liquid in the fuel tank can be put only very convenient cleaning as long as fuel tank turned around.
The hydraulic power system source (see figure 8) that manual pressure pump and fuel tank are formed installs the hydraulic power system source that just constitutes manual pressure pump and fuel tank composition with the manual pressure pump with 8 M6 socket head screws and fuel tank.It is reasonably that so little miniature manual pressure pump is joined so little miniature fuel tank (the fuel tank nominal volume is 4.5 liters), and two miniature combining like this can be satisfied supply requirement behind the mechanical seal micro-leakage just.
The leakage standard of mechanical seal is generally ordered in the world at present and is 3ml/H.Generally≤micro-leakage of 3ml/H is because temperature, evaporation and the reasons such as wind air flows quickening that run up of equipment, naked eyes are (mechanical seal are to allow lubricating etc. between a pair of friction piece that micro-leakage guarantees running relatively) of can't see this micro-leakage generally speaking.With miniature manual pressure pump with miniature fuel tank is appropriate can satisfy the mechanical seal usage requirement.Reach rationally economy, practicality.
Two cover mechanical seals in the installation form of double mechanical seal, have been used, this two covers mechanical seal is with placing buffer fluid (work sealing liquid) environment, isolation fluid pressure is higher than the pump pressure medium, and the close leakage direction of envelope was buffer fluid (work sealing liquid) seepage in medium in this just controlled.The circulation (cooling and lubricated effect have been played in mechanical seal) that pump efficiency ring (generally being to have in the mechanical seal) send buffer fluid (work sealing liquid) to pressurized tank to realize buffer fluid (work sealing liquid).The buffer fluid of pressurized tank (work sealing liquid) has also played the buffer action of sealing medium and atmosphere, has effectively controlled the leakage of sealing medium, guard ring environment pollution and personal safety.
Claims (1)
1. mechanical seal manual pressure control system, comprise the manual pressure pump, fuel tank, pressurized tank and Sealing, it is characterized in that: described manual pressure pump (1) comprises valve body (5), shell (6), plunger case (7), plunger (8), spring seat (9,10,11), oil extraction valve seat (12), oil suction valve seat (13) and the bar of draining the oil (14), bearing pin frame (15), operating grip (16) and bearing pin (17), valve body linked into an integrated entity with screw and shell pack in the fuel tank (2), be assembled into one with screw and fuel tank again and form the hydraulic power system source, outer casing bottom leaves exhaust port (30), one side of valve body leaves flow-off (31), drain the oil and pressure release screw (32) is housed on the bar, pressure regulating screw (33) is housed on the spring seat (10); Oiling plunger (18) is housed on the fuel tank, the inner pressure ring (19) that is connected with the manual pressure pump is housed in the fuel tank, sealing gasket (20) is housed between inner pressure ring and the fuel tank, fuel tank is provided with indent formula space (21); Fuel tank and pressurized tank (3) are packed in respectively on the supporting frame (4); Leave manual pressure pump sealing liquid import (23), sealing liquid import (24), sealing liquid outlet (25) on the tank body of pressurized tank (22), liquid-level switch (26A) and pressure switch (26B) are housed respectively on the tank body, pressure switch connects pressure gauge (39), leave filler (27) and emptying valve export or torch interface (38) respectively at the tank body top, visor (40) is housed in the tank body middle and upper part, at the tank body inner bottom part cooling coil (34) is housed, tank base leaves cooling water inlet (36), cooling water outlet (37) and sewage draining exit (35) respectively; Sealing (28) is gone up the back-to-back mechanical seal (29) that the band pump efficiency ring is installed, and constitutes the Seal cage of a sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202183447U CN201672063U (en) | 2010-06-08 | 2010-06-08 | Manual pressurization control system for mechanical seal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010202183447U CN201672063U (en) | 2010-06-08 | 2010-06-08 | Manual pressurization control system for mechanical seal |
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| CN201672063U true CN201672063U (en) | 2010-12-15 |
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| CN2010202183447U Expired - Fee Related CN201672063U (en) | 2010-06-08 | 2010-06-08 | Manual pressurization control system for mechanical seal |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277517A (en) * | 2013-04-27 | 2013-09-04 | 福斯流体控制（苏州）有限公司 | Sealing cooling structure of rotating device |
| CN104121190A (en) * | 2013-04-26 | 2014-10-29 | 上海易昆机械工程有限公司 | Rotor pump hydraulic oil tank |
| CN105605225A (en) * | 2016-03-04 | 2016-05-25 | 浙江长城减速机有限公司 | Balance tank for liquid supplement under pressure |
| CN105782440A (en) * | 2016-05-04 | 2016-07-20 | 无锡市伊利亚特机械制造有限公司 | Double-layer liquid sealing tank facilitating liquid supplementing |
| CN106151852A (en) * | 2015-04-20 | 2016-11-23 | 淮北矿山机器制造有限公司 | A kind of large-scale thickener automatic fuelling device |
| CN107676483A (en) * | 2017-09-27 | 2018-02-09 | 上海中车汉格船舶与海洋工程有限公司 | PODDED PROPULSOR spindle seal system |
| CN110274023A (en) * | 2019-06-25 | 2019-09-24 | 杭州电子科技大学 | A kind of enclosure seal lubrication assistant boosting method |
| CN113606127A (en) * | 2021-07-10 | 2021-11-05 | 郑州众城润滑科技有限公司 | Automatic pressure relief method in pump cavity of plunger pump |
-
2010
- 2010-06-08 CN CN2010202183447U patent/CN201672063U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104121190A (en) * | 2013-04-26 | 2014-10-29 | 上海易昆机械工程有限公司 | Rotor pump hydraulic oil tank |
| CN104121190B (en) * | 2013-04-26 | 2018-01-05 | 上海易昆机械工程有限公司 | A kind of impeller pump hydraulic pressure oil tank |
| CN103277517A (en) * | 2013-04-27 | 2013-09-04 | 福斯流体控制（苏州）有限公司 | Sealing cooling structure of rotating device |
| CN106151852A (en) * | 2015-04-20 | 2016-11-23 | 淮北矿山机器制造有限公司 | A kind of large-scale thickener automatic fuelling device |
| CN105605225A (en) * | 2016-03-04 | 2016-05-25 | 浙江长城减速机有限公司 | Balance tank for liquid supplement under pressure |
| CN105782440A (en) * | 2016-05-04 | 2016-07-20 | 无锡市伊利亚特机械制造有限公司 | Double-layer liquid sealing tank facilitating liquid supplementing |
| CN107676483A (en) * | 2017-09-27 | 2018-02-09 | 上海中车汉格船舶与海洋工程有限公司 | PODDED PROPULSOR spindle seal system |
| CN110274023A (en) * | 2019-06-25 | 2019-09-24 | 杭州电子科技大学 | A kind of enclosure seal lubrication assistant boosting method |
| CN113606127A (en) * | 2021-07-10 | 2021-11-05 | 郑州众城润滑科技有限公司 | Automatic pressure relief method in pump cavity of plunger pump |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101215 Termination date: 20140608 |