CN105952633B - A kind of high pressure reciprocating plunger pump hydraulic end through type combination valve - Google Patents
A kind of high pressure reciprocating plunger pump hydraulic end through type combination valve Download PDFInfo
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- CN105952633B CN105952633B CN201610531393.8A CN201610531393A CN105952633B CN 105952633 B CN105952633 B CN 105952633B CN 201610531393 A CN201610531393 A CN 201610531393A CN 105952633 B CN105952633 B CN 105952633B
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- discharge opeing
- combination valve
- gland
- valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
- F04B53/109—Valves; Arrangement of valves inlet and outlet valve forming one unit
- F04B53/1092—Valves; Arrangement of valves inlet and outlet valve forming one unit and one single element forming both the inlet and outlet closure member
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
A kind of high pressure reciprocating plunger pump hydraulic end through type combination valve.Installed in the inside of high pressure reciprocating plunger pump hydraulic end cylinder body, including gland core, gland, feed liquor spring, feed liquor valve plate, combination valve body, discharge opeing bonnet, discharge opeing valve element, discharge opeing spring and discharge opeing valve plate；The high pressure reciprocating plunger pump hydraulic end through type combination valve that the present invention is provided enter discharge opeing only a suction-compression-discharge cyclic process can just be completed by a valve body, two seal faces and liquid sucking-discharging spring, single valve group can be avoided being arranged vertically in the past to the high-voltage alternating loading problem caused at pump housing right-angled intersection hole, and with simple and compact for structure, detachable maintaining is convenient, the maintenance easy to process of valve seal end face, good manufacturability, flow loss are small, stable working, sealed reliable, small noise, long lifespan the advantages of.
Description
Technical field
The invention belongs to hydraulic machinery technical field, more particularly to a kind of high pressure reciprocating plunger pump hydraulic end through type group
Close valve.
Background technology
High pressure reciprocating pump is also known as plunger pump, is an important device of hydraulic system, and it is by plunger in cylinder body
Move back and forth, make the volume of pressurization working lumen change to realize suction medium, compressed media, with rated pressure height, knot
The advantages of structure is compact, efficiency high and Flow-rate adjustment facilitate, is widely used in the field that high pressure, big flow and flow need to adjust
Close, in such as hydraulic press, engineering machinery, oil field and ship.Conventional plunger pump is main by power end and fluid end two at present
It is grouped into, power end is used to the energy of prime mover being transmitted to fluid end, mainly including crankcase, high speed shaft, bent axle, gear ring, company
Bar and crosshead；Fluid end is then used to convert mechanical energy into liquid pressure energy.Fig. 1 is a kind of plunger pump upper liquid of prior art
Power end separation structure longitudinal sectional view.As shown in figure 1, this fluid end mainly includes the post shown in cylinder body 9, gland 10, figure
Plug and bracket, feed liquor valve group and discharge opeing valve group；Described cylinder body 9 is horizontally set on the support for being connected to power end upper crankcase rear end
Outside frame, middle part is formed with an inlet 11, and outage is provided with close to the side of gland 10；Gland 10 is connected to after cylinder body 9
End；Feed liquor valve group includes feed liquor valve seat 1, feed liquor valve plate 2, feed liquor bonnet 3 and feed liquor spring 4；Feed liquor bonnet 3 is located at cylinder body 9
Inside middle part, one end is fixed on the cylinder body 9 relative with inlet 11；Feed liquor valve seat 1 is fixed at inlet 11, which is provided with
3 feed liquor elongated holes 12, and there is a dismounting screw at middle part；Feed liquor spring 4 is enclosed on the middle part of feed liquor bonnet 3；Feed liquor valve plate 2 is with can
The mode moved radially along cylinder body 9 is enclosed on the position being located on feed liquor bonnet 3 between feed liquor spring 4 and feed liquor valve seat 1, and outside
Portion can block or leave feed liquor elongated hole 12；Discharge opeing valve group includes discharge opeing valve seat 5, discharge opeing valve plate 6, discharge opeing bonnet 7 and discharge opeing
Spring 8；Discharge opeing bonnet 7 is located at the rear interior of cylinder body 9, and one end is fixed on the side of end cap 10；Discharge opeing valve seat 5 with liquid feed valve
1 perpendicular mode of seat is arranged in cylinder body 9 positioned at the position of the rear side of feed liquor bonnet 3, and three liquid stream elongated holes 13 are formed with thereon；
Discharge opeing spring 8 is enclosed on the middle part of discharge opeing bonnet 7；Discharge opeing valve plate 6 is enclosed on discharge opeing bonnet 7 in the way of it can be moved axially along cylinder body 9
The upper position being located between discharge opeing spring 8 and discharge opeing valve seat 5, and outside can block or leave liquid stream elongated hole 13；Cylinder body 9
Front end inside a plunger is installed in a sliding manner, the front end of plunger connects with the rear end of crosshead on power end.
Now the plunger pump operation principle of this prior art is described below：When needing compressed liquid, in the work of motor
Under, high speed shaft on power end will produce rotation, so as to drive crank rotation by gear ring, then drivening rod, crosshead
Horizontal reciprocating movement, crosshead drives plunger to be moved back and forth in cylinder body 9 again.When plunger makees drawback movement, cylinder body 9
Volume gradually increases, and forms parital vacuum, and now discharge opeing valve plate 6 will abut against discharge opeing under the effect of the elastic force of discharge opeing spring 8
Liquid stream elongated hole 13 is blocked on valve seat 5, in the presence of pressure difference, low pressure liquid will pass through and entering that inlet 11 is connected
Liquid pipe enters in the feed liquor elongated hole 12 on feed liquor valve seat 1, thus inwardly promotes feed liquor valve plate 2, while compressing feed liquor spring 4, directly
The feed liquor elongated hole 12 on feed liquor valve seat 1 is left to feed liquor valve plate 2, at this moment low pressure liquid will go into the inside of cylinder body 9, plunger after
Continuous when being moved to backhaul extreme position, imbibition process is terminated, and at this moment, the inside imbibition of cylinder body 9 is most.When plunger makees process motion
When, the volume in cylinder body 9 is gradually reduced, and liquid is squeezed, pressure increase, in hydraulic pressure and the common work of the elastic force of feed liquor spring 4
Under, feed liquor valve plate 2 will be pushed back at feed liquor valve seat 1 and block feed liquor elongated hole 12, when fluid pressure reaches certain value,
Highly pressurised liquid will promote discharge opeing valve plate 6 to the left, while discharge opeing spring 8 is compressed, until discharge opeing valve plate 6 is left on discharge opeing valve seat 5
Liquid stream elongated hole 13, at this moment the highly pressurised liquid inside cylinder body 9 will go into inside the left side of cylinder body 9, then outwards arranged through leakage fluid dram
Go out to receiving in container, when plunger reaches process extreme position, the volume inside cylinder body 9 is minimum, and discharge opeing process is finished.Work as cylinder body
When fluid pressure reduces in 9, discharge opeing valve plate 6 will be returned to discharge opeing valve seat 5 and liquid stream is long in the presence of the elastic force of discharge opeing spring 8
Hole 13 is blocked.Because plunger is constantly moved back and forth, just constantly alternately, highly pressurised liquid is then continuous for liquid sucking-discharging process
Ground is exported.
But, there is following point in the high pressure reciprocating pump of this prior art：Feed liquor valve group and discharge opeing valve group thereon
It is to be separately provided in orthogonal mode, therefore complicated, difficulty of processing and volume and flow loss are big, and repair not
Just.In addition, noise ratio is larger during operation.
The content of the invention
In order to solve the above problems, it is an object of the invention to provide a kind of high pressure reciprocating plunger pump hydraulic end through type
Combination valve.
In order to achieve the above object, the high pressure reciprocating plunger pump hydraulic end through type combination valve that the present invention is provided.Install
In the inside of high pressure reciprocating plunger pump hydraulic end cylinder body, described fluid end mainly includes cylinder body, end cap, plunger, through type group
Close valve and bracket；Wherein cylinder body, which is horizontally set on, is connected to outside the bracket of power end upper crankcase rear end, and middle part is formed with one
Individual inlet, rear end is provided with leakage fluid dram；End cap is connected to the rear end of cylinder body；Installed in a sliding manner inside the front end of cylinder body 9
There is a plunger, the front end of plunger connects with the rear end of crosshead on power end；Described combination valve include gland core, gland,
Feed liquor spring, feed liquor valve plate, combination valve body, discharge opeing bonnet, discharge opeing valve element, discharge opeing spring and discharge opeing valve plate；Wherein enter discharge opeing
Valve body is cylindrical structure, is horizontally set in cylinder body at the inlet at middle part, one has been inwardly formed on the periphery of middle part
Scrobicular ring, is axially inside formed with a centre bore, and one end close to plunger is formed with multiple radial inclined holes, inclined hole
One end is located on the outer face at the end, and the other end is located at scrobicular ring；Gland core is dome shape, the water in the way of opening is towards plunger
Be formed with the side of safety combination valve body in the cylinder body, top surface on an inlet opening, periphery be formed with it is multiple lateral
Inlet opening, lower edge, which caves inward, is formed with multiple elongated slots；Gland is circular tube shaped, and one end is enclosed on the rear outside of gland core；
Feed liquor valve plate is vertically set in the way of it can be moved axially along cylinder body between gland and combination valve body, and middle part is formed with
One interstitial hole, outside left is corresponding with the inclined hole position on combination valve body, and the lateral edge towards gland is outwardly
It is formed with a spring positioning ring；One end of feed liquor spring is located in the gap between gland core and gland, and the other end is fixed on
The outside of spring positioning ring on feed liquor valve plate；Discharge opeing bonnet is dome shape, and level is pacified in the way of opening surface is to combination valve body
Mounted in the opposite side of combination valve body, multiple side outages are formed with periphery；Discharge opeing valve element is arranged on discharge opeing bonnet
By inboard position in inner chamber, middle part is axially formed with a centre pilot hole, periphery along cylinder body and is formed with multiple one
Hold the oblique fluid hole being connected with centre pilot hole；Discharge opeing valve plate is the screw-like structure being made up of top surface and guide rod, water
It is flat to be arranged on outer side in the inner chamber of discharge opeing bonnet, and guide rod is inserted in discharge opeing valve element in a movable manner
In heart pilot hole；Discharge opeing spring housing is on the outer circumference surface of discharge opeing valve element, and one end and the medial surface of top surface on discharge opeing valve plate
It is in contact.
Described combination valve also includes the back-up ring being arranged between cylinder body inner peripheral surface and discharge opeing bonnet outer circumference surface and O-shaped
Sealing ring.
Described multiple inclined holes spaced set on combination valve body.
Described multiple lateral inlet openings spaced set on gland core.
The quantity of described elongated slot is three, the spaced set on gland core, and with the position of lateral inlet opening that
This staggers.
The high pressure reciprocating plunger pump hydraulic end through type combination valve that the present invention is provided enter discharge opeing only by a valve body,
Two seal faces and liquid sucking-discharging spring can just complete a suction-compression-discharge cyclic process, can avoid in the past vertical
Single valve group is arranged to the high-voltage alternating loading problem caused at pump housing right-angled intersection hole, and with it is simple and compact for structure, tear open
The maintenance easy to process of easy to maintenance, valve seal end face is unloaded, good manufacturability, flow loss are small, stable working, sealed reliable, make an uproar
Sound is small, long lifespan the advantages of.
Brief description of the drawings
Fig. 1 is fluid power end separation structure longitudinal sectional view on a kind of plunger pump of prior art.
Fig. 2 is is provided with the high pressure reciprocating pump fluid end structure longitudinal sectional view of combination valve that the present invention is provided.
Fig. 3-Fig. 6 is respectively that discharge opeing bonnet is three-dimensional in the combination valve that provides of the present invention, longitudinal section view, the right side are regarded and front view.
Fig. 7-Fig. 9 is respectively discharge opeing valve element solid, longitudinal section view and top view in the combination valve that the present invention is provided.
Figure 10-Figure 11 is respectively gland solid and longitudinal sectional view in the combination valve that the present invention is provided.
Feed liquor valve plate stereogram in the combination valve that Figure 12 provides for the present invention.
Figure 13-Figure 16 is respectively combination valve body solid, longitudinal section view, main view and a left side in the combination valve that the present invention is provided
View.
Discharge opeing valve plate stereogram in the combination valve that Figure 17 provides for the present invention.
Gland core solid, left view and front view in the combination valve that Figure 18-Figure 20 provides for the present invention.
Embodiment
The high pressure reciprocating plunger pump hydraulic end through type group provided below in conjunction with the accompanying drawings with specific embodiment the present invention
Valve is closed to be described in detail.Identical drawing reference numeral is used with prior art identical part.
As shown in Fig. 1-Figure 20, the high pressure reciprocating plunger pump hydraulic end that the present invention is provided is arranged on through type combination valve
The inside of high pressure reciprocating plunger pump hydraulic end cylinder body 9, described fluid end mainly includes cylinder body 9, end cap 10, plunger 14, straight-through
Bracket not shown in formula combination valve and figure；Wherein cylinder body 9 is horizontally set on the bracket for being connected to power end upper crankcase rear end
Outside, middle part is formed with an inlet 11, and rear end is provided with leakage fluid dram；End cap 10 is connected to the rear end of cylinder body 9；Before cylinder body 9
End is internal to be provided with a plunger 14 in a sliding manner, and the front end of plunger 14 connects with the rear end of crosshead on power end；Institute
The through type combination valve stated includes gland core 15, gland 16, feed liquor spring 17, feed liquor valve plate 18, combination valve body 19, tapping valve
Lid 20, discharge opeing valve element 21, discharge opeing spring 22 and discharge opeing valve plate 23；Wherein combination valve body 19 is cylindrical structure, and level is set
Put and in cylinder body 9 at the inlet 11 at middle part, a scrobicular ring has been inwardly formed on the periphery of middle part, one is axially inside formed with
Individual centre bore 24, multiple radial inclined holes 25 are formed with close to one end of plunger 14, and one end of inclined hole 25 is located at the end
On outer face, the other end is located at scrobicular ring；Gland core 15 is dome shape, and cylinder is horizontally arranged in the way of opening is towards plunger 14
It is formed with body 9 on the side of combination valve body 19, top surface on an inlet opening 26, periphery and is formed with multiple lateral inlet openings
27, lower edge, which caves inward, is formed with multiple elongated slots 28；Gland 16 is circular tube shaped, and one end is enclosed on outside the rear portion of gland core 15
Side；Feed liquor valve plate 18 is vertically set between gland 16 and combination valve body 19 in the way of it can be moved axially along cylinder body 9, middle
Position is formed with an interstitial hole 29, and outside left is corresponding with the position of inclined hole 25 on combination valve body 19, towards gland 16
Lateral edge outwardly be formed with a spring positioning ring 30；One end of feed liquor spring 17 is located at gland core 15 and gland 16
Between gap in, the other end is fixed on the outside of spring positioning ring 30 on feed liquor valve plate 18；Discharge opeing bonnet 20 is dome shape, with
Opening surface, which is horizontally arranged to the mode of combination valve body 19 on the opposite side of combination valve body 19, periphery, is formed with multiple sides
Face outage 31；Discharge opeing valve element 21 is arranged in the inner chamber of discharge opeing bonnet 20 by inboard position, and middle part is along the axial shape of cylinder body 9
The oblique fluid hole that multiple one end are connected with centre pilot hole 32 is formed with Cheng Youyi centre pilot hole 32, periphery
33；Discharge opeing valve plate 23 is the screw-like structure being made up of top surface 34 and guide rod 35, is horizontally set on the inner chamber of discharge opeing bonnet 20
In outer side, and guide rod 35 is inserted in the centre pilot hole 32 of discharge opeing valve element 21 in a movable manner；Discharge opeing
Spring 22 is enclosed on the outer circumference surface of discharge opeing valve element 21, and one end is in contact with the medial surface of top surface 34 on discharge opeing valve plate 23.
Described combination valve also includes the back-up ring 36 being arranged between the inner peripheral surface of cylinder body 9 and the outer circumference surface of discharge opeing bonnet 20
With O-ring seal 37.
Described multiple inclined holes 25 spaced set on combination valve body 19.
Described multiple lateral inlet opening 27 spaced sets on gland core 15.
The quantity of described elongated slot 28 be three, the spaced set on gland core 15, and with lateral inlet opening 27
Position offsets one from another.
The high pressure reciprocating plunger pump hydraulic end that now present invention is provided is described below with the operation principle of through type combination valve：
Imbibition process is to produce negative pressure to movement outside in cylinder body 9 by plunger 14, and at this moment medium is by by the feed liquor on cylinder body 9
Mouthfuls 11 and combination valve body 19 on inclined hole 25 push feed liquor valve plate 18 on the end face of combination valve body 19 open, medium is from entering afterwards
The circumference and interstitial hole 29 of liquid valve plate 18 and the inside for entering gland 16, at the same time, feed liquor spring 17 is compressed, afterwards medium
Lateral inlet opening 27 on the circumference of gland core 15 and elongated slot 28 by also serving as imbibition lift limiter enter in gland core 15
In chamber, so that full of the imbibition cavity residing for the inner plunger 14 of cylinder body 9, plunger 14 is moved back and forth, and feed liquor spring 17 relies on elastic force
Promote feed liquor valve plate 18 to be moved to combination valve body 19, and then block inclined hole 25, thus complete imbibition process；During discharge opeing, enter
Feed liquor valve plate 18 is pressed on the end face of combination valve body 19 by the pressure difference that liquid spring 17 and medium are produced, and is thus cut off feed liquor and is led to
Road, at this moment medium will sequentially enter the inlet opening 26 on the top surface of gland core 15, the interstitial hole 29 on feed liquor valve plate 18 and enter discharge opeing
Centre bore 24 on valve body 19, plunger 14 continues to move to the direction of combination valve body 19, and medium is compressed, when medium reaches
The discharge opeing valve plate 23 of the opposite side of combination valve body 19 will be pressed off during the pressure value of setting, discharge opeing valve plate 23 is given birth to along discharge opeing is also served as
Moved into the centre pilot hole 32 on the discharge opeing valve element 21 of limiter, high-pressure medium enters in the inner chamber of discharge opeing bonnet 20 afterwards,
Discharged afterwards by the side outage 31 on discharge opeing bonnet 20 through the leakage fluid dram on cylinder body, discharge opeing spring 22 will be according to afterwards
On the end face that discharge opeing valve plate 23 is pressed on to combination valve body 19 by elastic force, so as to complete a working cycles, subsequently enter
Next circulation.
Claims (5)
1. a kind of high pressure reciprocating plunger pump hydraulic end through type combination valve, installed in the cylinder body of high pressure reciprocating plunger pump hydraulic end
（9）Inside, described fluid end mainly includes cylinder body (9), gland (10), plunger (14), through type combination valve and bracket；Wherein
Cylinder body (9), which is horizontally set on, to be connected to outside the bracket of power end upper crankcase rear end, and middle part is formed with an inlet (11),
Rear end is provided with leakage fluid dram；Gland (10) is connected to the rear end of cylinder body (9)；Installed in a sliding manner inside the front end of cylinder body (9)
There is a plunger (14), the front end of plunger (14) connects with the rear end of crosshead on power end；It is characterized in that：Described is straight-through
Formula combination valve includes gland core (15), gland (16), feed liquor spring (17), feed liquor valve plate (18), combination valve body (19), discharge opeing
Bonnet (20), discharge opeing valve element (21), discharge opeing spring (22) and discharge opeing valve plate (23)；Wherein combination valve body (19) is cylindrical
Structure, is horizontally set on inlet (11) place at middle part in cylinder body (9), middle part periphery and has been inwardly formed a scrobicular ring, interior
Portion has been axially formed a centre bore (24), and one end close to plunger (14) is formed with multiple radial inclined holes (25),
One end of inclined hole (25) is located on the outer face at the end, and the other end is located at scrobicular ring；Gland core (15) is dome shape, with opening surface
It is horizontally arranged to the mode of plunger (14) on the side of the interior combination valve body (19) of cylinder body (9), top surface and is formed with a feed liquor
Multiple lateral inlet openings (27) are formed with hole (26), periphery, lower edge, which caves inward, is formed with multiple elongated slots (28)；Pressure
It is circular tube shaped to cover (16), and one end is enclosed on the rear outside of gland core (15)；Feed liquor valve plate (18) along cylinder body (9) can move axially
Mode be vertically set between gland (16) and combination valve body (19), middle part is formed with an interstitial hole (29), outside
Side is corresponding with inclined hole (25) position on combination valve body (19), towards the outwardly shape of lateral edge of gland (16)
Cheng Youyi spring positioning ring (30)；One end of feed liquor spring (17) is located at the gap between gland core (15) and gland (16)
In, the other end is fixed on the outside of spring positioning ring (30) on feed liquor valve plate (18)；Discharge opeing bonnet (20) is dome shape, with opening
It is horizontally arranged in face of the mode of combination valve body (19) on the opposite side of combination valve body (19), periphery and is formed with multiple sides
Face outage (31)；Discharge opeing valve element (21) is arranged in the inner chamber of discharge opeing bonnet (20) by inboard position, and middle part is along cylinder body
(9) it has been axially formed and has been formed with multiple one end on a centre pilot hole (32), periphery and is connected with centre pilot hole (32)
Oblique fluid hole (33)；Discharge opeing valve plate (23) is the screw-like structure being made up of top surface (34) and guide rod (35), and level is set
The outer side in the inner chamber of discharge opeing bonnet (20) is put, and guide rod (35) is inserted in discharge opeing valve element in a movable manner
(21) in centre pilot hole (32)；Discharge opeing spring (22) is enclosed on the outer circumference surface of discharge opeing valve element (21), and one end and row
The medial surface of top surface (34) is in contact on liquid valve plate (23).
2. high pressure reciprocating plunger pump hydraulic end through type combination valve according to claim 1, it is characterised in that：Described
Through type combination valve also include being arranged on back-up ring (36) between cylinder body (9) inner peripheral surface and discharge opeing bonnet (20) outer circumference surface and
O-ring seal (37).
3. high pressure reciprocating plunger pump hydraulic end through type combination valve according to claim 1, it is characterised in that：Described
Multiple inclined holes (25) spaced set on combination valve body (19).
4. high pressure reciprocating plunger pump hydraulic end through type combination valve according to claim 1, it is characterised in that：Described
Multiple lateral inlet openings (27) spaced set on gland core (15).
5. high pressure reciprocating plunger pump hydraulic end through type combination valve according to claim 1, it is characterised in that：Described
The quantity of elongated slot (28) is three, the spaced set on gland core (15), and with the position of lateral inlet opening (27) each other
Stagger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610531393.8A CN105952633B (en) | 2016-07-07 | 2016-07-07 | A kind of high pressure reciprocating plunger pump hydraulic end through type combination valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610531393.8A CN105952633B (en) | 2016-07-07 | 2016-07-07 | A kind of high pressure reciprocating plunger pump hydraulic end through type combination valve |
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| Publication Number | Publication Date |
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| CN105952633A CN105952633A (en) | 2016-09-21 |
| CN105952633B true CN105952633B (en) | 2017-10-10 |
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| CN201610531393.8A Active CN105952633B (en) | 2016-07-07 | 2016-07-07 | A kind of high pressure reciprocating plunger pump hydraulic end through type combination valve |
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| CN203463278U (en) * | 2013-09-28 | 2014-03-05 | 宁波大隆机器制造有限公司 | Combination valve |
| CN204738957U (en) * | 2015-07-03 | 2015-11-04 | 中国石油大学(华东) | Novel combination valve style water injection pump |
| CN205101219U (en) * | 2015-11-09 | 2016-03-23 | 中石化石油工程技术服务有限公司 | Plunger pump, plunger pump fluid end and sealed combination valve thereof |
| CN205805894U (en) * | 2016-07-07 | 2016-12-14 | 天津市海盛泵业制造有限公司 | A kind of high pressure reciprocating plunger pump hydraulic end through type combination valve |
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|---|---|
| CN105952633A (en) | 2016-09-21 |
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