CN102642117B - High-performance valve body of proportional servo valve and manufacturing method thereof - Google Patents
High-performance valve body of proportional servo valve and manufacturing method thereof Download PDFInfo
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- CN102642117B CN102642117B CN201210119477.2A CN201210119477A CN102642117B CN 102642117 B CN102642117 B CN 102642117B CN 201210119477 A CN201210119477 A CN 201210119477A CN 102642117 B CN102642117 B CN 102642117B
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Abstract
The invention discloses a high-performance valve body of a proportional servo valve and a manufacturing method of the high-performance valve body of a proportional servo valve. The manufacturing method provided by the invention comprises the following steps of: dividing a cuboid into three sections and milling to three cuboids, respectively processing channels such as a groove, a through hole or a working oil port on each cuboid, combining the three cuboids according to a certain order to carry out combined treatment, and carrying out vacuum brazing to form an integrated valve body. The manufactured valve body comprises a valve body dark cavity, valve body through holes and a working oil port, wherein the valve body through holes are respectively communicated with the valve body dark cavity and the working oil port. The manufacturing method provided by the invention is simple and feasible, the rationality of the shape of each channel in the valve body is ensured, the intensity and the cleanliness of the valve body are improved, and the noise generated in the using process of the valve is reduced, so that the valve body and the valve core are reliably matched. The invention further provides a valve body produced by the manufacturing method.
Description
Technical field
The present invention relates to valve body and the manufacture method thereof of proportional servo valve in a kind of hydraulic drive field.
Background technology
Proportional servo valve is widely used in hydraulic drive field, owing to there is the design feature of many runners in its valve body, makes valve body in processing and manufacture process, have larger difficult point.Conventionally adopt at present following two kinds of methods to carry out the manufacture of proportional servo valve body:
1) method of casting.The method of employing casting can be directly by runner and whole valve body casting, but there is following insoluble shortcoming in this manufacture method: first, the casting sand remaining in casting process in numerous oil ducts of valve body, dark chamber or groove is difficult to remove, and the casting sand retaining can cause card valve phenomenon when the cooperating of valve body and spool, and then cause system down; Secondly, the burr producing in casting process is difficult to remove, and under the effect of high pressure, burr will be dug, and this phenomenon also can cause moving bad or spool in the cooperating process of valve body and spool and be stuck, so also can affect the functional reliability of system; Finally, in the valve body that the method for employing casting produces, conventionally have pore, sand holes, defects i.e.cracks, therefore make valve body in use be easy to leak or leak gas, service life is shorter.
2) method of steel part processing.This method is on steel part, to process oil duct, dark chamber and groove, and due to the oil duct of high-performance ratio servo valve valve body, dark chamber and groove shapes complexity and One's name is legion, therefore adopt the difficulty of steel part processing very large, conventionally the structures such as oil duct after processing can not meet the mobile dynamics requirement of fluid, be easy to produce air pockets erosion phenomenon, thereby cause proportional servo valve noise when work very large, and it is not high to adopt the valve body compression resistance producing in this way.
Summary of the invention
Object of the present invention is exactly in order to overcome above-mentioned the deficiencies in the prior art, a kind of manufacture method of high-performance ratio servo valve valve body is provided, it has solved the shortcoming that proportional servo valve body is difficult to processing, manufactures, make manufacture process simple, body strength and the cleannes of manufacturing gained are high, the good fluidity of fluid in valve body, the cooperating of valve body and spool is more reliable.The present invention also provides a kind of high-performance ratio servo valve valve body by this manufacture method manufacturing.
For realizing above-mentioned purpose of the present invention, the manufacture method of high-performance ratio servo valve valve body of the present invention comprises the steps: to choose cylindrical blank, uses precise forging machine that cylindrical blank is forged into cuboid blank; Use sawing machine that the cuboid blank being forged into is sawn into three sections; Milling is flat respectively by the end face of described three sections of blanks to use milling machine, forms the first cuboid, the second cuboid, the 3rd cuboid; Respectively at the first cuboid, the second cuboid and position corresponding the process screwed hole of the 3rd cuboid near four summits; An end face center at the first cuboid processes groove; An end face at the second cuboid processes respectively rectangular through-hole, the first rectangular recess, the second rectangular recess, and in the other end opposing with the second cuboid one end face, processes the first half through holes that are communicated with described the first rectangular recess and the second rectangular recess; At an end face of the 3rd cuboid, process the second half through holes, and in the other end opposing with an end face described in the 3rd cuboid, process a plurality of actuator ports that are communicated with described the second half through holes; The first cuboid, the second cuboid, the 3rd cuboid that carry out above-mentioned processing are carried out to combined treatment, thereby make three cuboids become a complete valve body, wherein, make rectangular through-hole, the first rectangular recess, second rectangular recess of described the second cuboid corresponding with the described groove of the first cuboid respectively, to form the dark chamber of valve body, and the second half through holes of the first half through holes that make the second cuboid and the 3rd cuboid are corresponding, form valve hole, thereby valve hole is connected with the dark chamber of valve body and actuator port respectively.
Preferably, the step of described combined treatment comprises: use respectively high precision grinder to carry out grinding a described end face of the both ends of the surface of a described end face of the first cuboid, the second cuboid, the 3rd cuboid; By evenly installing metal dust additional on the corresponding surface of complete three cuboids of grinding, two corresponding faces are bonded together, and through three cuboid correspondences, are processed with screwed hole place successively with four screws, by three cuboids assembling lockings; Three cuboids that assemble are directly put into vacuum drying oven and heat, adopt the temperature of 700 ℃-900 ℃ to heat-treat, by vacuum brazing, three cuboids are welded as a whole to form valve body, wherein weld opposite joint and be less than or equal to 0.05mm.
The step of preferably, processing described the first half through holes comprises: the center in other end described in the second cuboid processes the first semicircle groove; On the axial direction of the first semicircle groove, process successively a plurality of semi-circular grooves; Wherein, the first semi-circular groove is connected with described the first rectangular recess and the second rectangular recess respectively with the 5th cannelure, thereby described the first rectangular recess and the second rectangular recess are communicated with the first half through holes.
Preferably, on other end described in the second cuboid, process the 5th rectangular recess that is positioned at valve hole one side, and described the 5th rectangular recess is connected with the 3rd semi-circular groove in described a plurality of semi-circular grooves.
Preferably, the step of processing described the second half through holes comprises: the center at an end face described in the 3rd cuboid processes the second semicircle groove, and it is corresponding with described the first semicircle groove position, thereby after docking with other end described in the second cuboid, an end face described in the 3rd cuboid forms valve hole; On the axial direction of the second semicircle groove, process successively a plurality of semi-circular grooves, and described semi-circular groove is corresponding with a plurality of described semi-circular groove position processing respectively, thereby after docking with other end described in the second cuboid, an end face described in the 3rd cuboid forms cannelure on other end described in the second cuboid.
Preferably, at an end face described in the 3rd cuboid, process the 3rd rectangular recess and the 4th rectangular recess that lays respectively at the second semicircle groove both sides, wherein, the 3rd rectangular recess is corresponding with described rectangular through-hole position, the 4th rectangular recess is corresponding with described the 5th rectangular recess position and be communicated with the 3rd semi-circular groove on side, thereby after an end face described in the 3rd cuboid docks with other end described in the second cuboid, the 4th rectangular recess docks formed groove with the 5th rectangular recess and is connected with the 3rd cannelure in described a plurality of cannelures.
Preferably, the step of processing a plurality of described actuator ports comprises: on other end described in the 3rd cuboid, process successively four actuator ports, wherein, the first actuator port is connected with described the 3rd rectangular recess, the second actuator port, the 4th actuator port respectively with described a plurality of cannelures in the second cannelure, the center of the 4th cannelure be connected, the 3rd actuator port is connected with the 3rd cannelure, thereby actuator port is connected with described valve hole.
Preferably, the step of described combined treatment also comprises: to the valve body carrying out after voltage-withstand test, use grinding machine to carry out grinding to peripheral surface.
Preferably, the material of manufacturing described high-performance ratio servo valve valve body is 42GrM.
It is a kind of according to the prepared high-performance ratio of above-mentioned manufacture method servo valve valve body that the present invention also provides.
Compared with prior art, beneficial effect of the present invention is embodied in following aspect:
1) the present invention adopts three cuboids is processed respectively, again three cuboids that process the dark chamber of valve body, valve hole and actuator port are carried out to combined treatment, to manufacture the manufacture method of high-performance ratio servo valve valve body, the manufacture process that makes valve body is simpler, processing is easier, the reasonability that has guaranteed each flow channel shape in valve body, makes the good flowing properties of fluid in valve body;
2) the present invention adopts the welding manner of vacuum brazing that three cuboids are carried out to combined treatment, has improved intensity and the cleannes of valve body, has reduced the noise that valve body in use produced;
3) cooperating of the prepared high-performance ratio of manufacture method of the present invention servo valve valve body and spool is more reliable.
Accompanying drawing explanation
Fig. 1 is that the three-dimensional axle of one embodiment of the invention high-performance ratio servo valve valve body is surveyed view;
Fig. 2 is the right view of the servo valve of high-performance ratio shown in Fig. 1 valve body;
Fig. 3 is that the A-A of the servo valve of high-performance ratio shown in Fig. 2 valve body is to cutaway view;
Fig. 4 is the stereogram of the first cuboid of one embodiment of the invention;
Fig. 5 is the upward view of the first cuboid shown in Fig. 4;
Fig. 6 is the stereogram of the second cuboid of one embodiment of the invention;
Fig. 7 is the upward view of the second cuboid shown in Fig. 6;
Fig. 8 is the stereogram of the 3rd cuboid of one embodiment of the invention;
Fig. 9 is the upward view of the 3rd cuboid shown in Fig. 8;
Figure 10 is the top view of the 3rd cuboid shown in Fig. 8;
Figure 11 is the schematic diagram after the first cuboid of one embodiment of the invention is connected with the second cuboid.
Description of reference numerals: 1-the first cuboid; 2-the second cuboid; 3-the 3rd cuboid; The dark chamber of 4-valve body; 5-valve hole; 6-actuator port; 11-groove; 21-the first half-round cross hole; 22-rectangular through-hole; 23-the first rectangular recess; 24-the second rectangular recess; 25-five rectangular recess; 31-the second half-round cross hole; 32-the 3rd rectangular recess; 33-the 4th rectangular recess; 51-the first cannelure; 52-the second cannelure; 53-the 3rd cannelure; 54-the 4th cannelure; 55-the 5th cannelure; 61-the first actuator port; 62-the second actuator port; 63-the 3rd actuator port; 64-the 4th actuator port; 211,311-the first semi-circular groove; 212,312-the second semi-circular groove; 213,313-the 3rd semi-circular groove; 214,314-the 4th semi-circular groove; 215,315-the 5th semi-circular groove.
The specific embodiment
As shown in Figure 1, high-performance ratio servo valve valve body of the present invention is comprised of the first cuboid (1), the second cuboid (2) and (3) three cuboids of the 3rd cuboid, wherein between the first cuboid (1) and the second cuboid (2), be formed with the dark chamber of valve body (4), between the second cuboid (2) and the 3rd cuboid (3), be formed with valve hole (5), and valve hole (5) and the dark chamber of valve body (4) are connected, on the 3rd cuboid (3), be also provided with a plurality of actuator ports (6), and these actuator ports (6) are communicated with valve hole (5).
In order to manufacture high-performance ratio servo valve valve body as above, the manufacture method that the present invention adopts is as follows:
1) choose a cylindrical blank, use precise forging machine that cylindrical blank is forged into cuboid blank;
2) use sawing machine that the cuboid blank being forged into is sawn into three sections;
3) milling is flat respectively by six end faces of described three sections of blanks to use X5032 milling machine, requires roughness to reach Ra32, forms and manufactures three required cuboids of valve body: the first cuboid (1), the second cuboid (2), the 3rd cuboid (3);
4) respectively at the first cuboid (1), the second cuboid (2) and position corresponding the process screwed hole of the 3rd cuboid (3) near four summits;
5) respectively the first cuboid (1), the second cuboid (2) are placed on BN800 machining center with the 3rd cuboid (3), and use bolt and pressing plate to be fixed, the fixing rear whole hard alloy rose cutter that uses is processed respectively three cuboids:
First, as shown in Figure 4, Figure 5, at the center position of (1) end face of the first cuboid, mill out a T connected in star (11).
Then, respectively two opposing end faces of the second cuboid (2) are processed.As shown in Figure 6,7, first on an end face of the second cuboid (2), mill out respectively rectangular through-hole (22), the first rectangular recess (23) and the second rectangular recess (24), and these through holes or groove are to arrange along the short transverse of cuboid shown in Fig. 6; Then with the opposing other end of this end face on mill out the first half through holes (21a).And the concrete steps that mill out the first half through holes (21a) comprise: on described other end, mill out first semicircle groove (21a), and this first semicircle groove is to arrange along the length direction of cuboid shown in Fig. 6, then on the axial direction of the first semicircle groove (21a), mill out successively a plurality of semi-circular grooves (211, 212, 213, 214, 215), in milling out the process of these semi-circular grooves, should make the symmetry axis of these semi-circular grooves overlap with the symmetry axis of the first semicircle groove (21a), and the first semi-circular groove (211) is connected respectively with the first rectangular recess (23) and the second rectangular recess (24) with the 5th cannelure (215), thereby the first rectangular recess (23) and the second rectangular recess (24) are communicated respectively with the first half through holes (21).After milling out the first half through holes (21a), in a side milling of the first semicircle groove (21a), go out the 5th rectangular recess (25), and it is connected with the 3rd semi-circular groove (213) in described a plurality of semi-circular grooves.
Finally, two opposing end faces of the 3rd cuboid (3) are processed.As shown in Fig. 8-10, first on an end face of the 3rd cuboid (3), mill out the second half through holes (31a): on an end face of the 3rd cuboid (3), mill out second semicircle groove (31a) corresponding with described the first semicircle groove (21a) position, wherein this second semicircle groove is to arrange along the length direction of cuboid shown in Fig. 8, and on the axial direction of the second semicircle groove (31a), mill out successively a plurality of semi-circular grooves (311, 312, 313, 314, 315), in the process of these semi-circular grooves of milling, should make the symmetry axis of semi-circular groove overlap with the symmetry axis of the second semicircle groove (31a), make these semi-circular grooves (311 simultaneously, 312, 313, 314, 315) with a plurality of described semi-circular groove (211 of processing on the described other end of the second cuboid (2), 212, 213, 214, 215) position is corresponding, then in the both sides of the second semicircle groove (31a), mill out the groove that two short transverses along cuboid shown in Fig. 8 are arranged: the 3rd rectangular recess (32) and the 4th rectangular recess (33), in process, should make that the 3rd rectangular recess (32) is corresponding with the position of described rectangular through-hole (22), the 4th rectangular recess (33) is corresponding with described the 5th rectangular recess (25) position, and the 4th rectangular recess (33) is connected with the 3rd semi-circular groove (313) on side, finally with the opposing other end of the described end face of the 3rd cuboid (3) on process successively four actuator ports (61, 62, 63, 64), these four actuator ports are to arrange along the short transverse of cuboid shown in Fig. 8, in process, should make the first actuator port (61) be connected with described the 3rd rectangular recess (32), the second actuator port (62), the 4th actuator port (64) respectively with described a plurality of semi-circular grooves in the second semi-circular groove (312), the center of the 4th semi-circular groove (314) is connected, and the 3rd actuator port (63) is connected with the 3rd semi-circular groove (313), thereby actuator port (6) is connected with described the second half through holes (31a).
6) adopt the method for combined treatment to be combined the first cuboid (1), the second cuboid (2), the 3rd cuboid (3) that carry out above-mentioned processing and form a complete valve body, concrete steps are as follows:
First, adopt high precision grinder respectively a described end face of the both ends of the surface of a described end face of the first cuboid (1), the second cuboid (2), the 3rd cuboid (3) to be carried out to grinding, and guarantee that roughness is in Ra0.4.
Secondly, by evenly installing metal dust additional on the corresponding surface of complete three cuboids of grinding, two corresponding faces are bonded together, concrete adhesion step is as follows:
As shown in figure 11, a described end face of the first cuboid (1) is corresponding with a described end face of the second cuboid (2), make rectangular through-hole (22), the first rectangular recess (23), second rectangular recess (24) of described the second cuboid (2) corresponding with the described groove (11) of the first cuboid (1) respectively, thereby formed the dark chamber of valve body (4);
As Fig. 1, Fig. 2, shown in Fig. 3, the described other end of the second cuboid (2) is corresponding with a described end face of the 3rd cuboid (3), make to lay respectively at two semi-circular grooves (211 on cuboid end face, 212, 213, 214, 215) with (311, 312, 313, 314, 315) corresponding connection forms five cannelures (51, 52, 53, 54, 55), make the first semicircle groove (21a) and the corresponding connection of the second semicircle groove (31a), after the connection corresponding to the 5th rectangular recess (25) of the 4th rectangular recess (33) and connection, be connected with the 3rd cannelure (53) in a plurality of cannelures, thereby realized the first half through holes (21) and the second half corresponding connections of through hole (31), formed valve hole (5).
By above-mentioned bonding mode, realized the object that valve hole (5) is connected with the dark chamber of valve body (4) and actuator port (6) respectively.
Then, with four screws, through three cuboid correspondences, be processed with successively the place of screwed hole, by three cuboid assembling lockings.
Finally, three cuboids that assemble are directly put into vacuum drying oven and heat, adopt the temperature of 700 ℃-900 ℃ to heat-treat, by vacuum brazing, three cuboids are welded as a whole and have formed valve body.In welding, require welding opposite joint to be less than or equal to 0.05mm, and do not allowed misalignment, pore, be mingled with.
In order to make the surface of high-performance ratio servo valve valve body brighter and cleaner, after carrying out combinations thereof processing, can use the overall peripheral face of the valve body that the butt welding of MM7132 grinding machine connects to carry out grinding.
Preferably, the material of manufacturing described high-performance ratio servo valve valve body is 42GrM.
In addition, in order to ensure adopting the intensity of the prepared high-performance ratio of above-mentioned manufacture method servo valve valve body to reach requirement, can be by one end blow-by except valve hole, all the other holes are all with covering plate sealing, then adopt hand driven high pressure pump to carry out the strength test of valve body, require valve body compression resistance to be not less than 280 kilograms.
Above-mentioned manufacture method is simple, the process of carrying out the runners such as groove on each cuboid is simple, in guaranteeing valve body the reasonability of each flow channel shape, make the better while of the flow behavior of fluid in valve body, intensity and the cleannes of valve body have also been improved, thereby make the cooperating of valve body and spool more reliable, greatly reduce the be stuck generation of phenomenon of spool in valve body and spool cooperating process, also greatly reduced the noise that valve body in use produced.
Therefore, adopt above-mentioned manufacture method, can produce the high-performance ratio servo valve valve body of superior performance.
Although above the present invention is explained in detail; but the invention is not restricted to this; those skilled in the art can principle according to the present invention modify, and therefore, all various modifications of carrying out according to principle of the present invention all should be understood to fall into protection scope of the present invention.
Claims (8)
1.
onethe manufacture method of planting high-performance ratio servo valve valve body, is characterized in that, comprises the steps:
Choose cylindrical blank, use precise forging machine that cylindrical blank is forged into cuboid blank;
Use sawing machine that the cuboid blank being forged into is sawn into three sections;
Milling is flat respectively by the end face of described three sections of blanks to use milling machine, forms the first cuboid (1), the second cuboid (2), the 3rd cuboid (3);
Respectively at the first cuboid (1), the second cuboid (2) and close four summits of the 3rd cuboid (3)
Position correspondence process screwed hole;
An end face center at the first cuboid (1) processes groove (11);
An end face at the second cuboid (2) processes respectively rectangular through-hole (22), the first rectangular recess (23), the second rectangular recess (24), and in the other end opposing with the second cuboid (2) one end faces, processes the first half through holes (21) that are communicated with described the first rectangular recess (23) and the second rectangular recess (24);
At an end face of the 3rd cuboid (3), process the second half through holes (31), and in the other end opposing with the described end face of the 3rd cuboid (3), process a plurality of actuator ports (6) that are communicated with described the second half through holes (31);
First cuboid (1) of above-mentioned processing will be carried out, the second cuboid (2), the 3rd cuboid (3) carries out combined treatment, thereby make three cuboids become a complete valve body, wherein, make the rectangular through-hole (22) of described the second cuboid (2), the first rectangular recess (23), the second rectangular recess (24) is corresponding with the described groove (11) of the first cuboid (1) respectively, to form the dark chamber of valve body (4), and the second half through holes (31) of the first half through holes (21) that make the second cuboid (2) and the 3rd cuboid (3) are corresponding, form valve hole (5), thereby valve hole (5) is connected respectively with the dark chamber of valve body (4) and actuator port (6),
Wherein, the step of described combined treatment comprises:
Use respectively high precision grinder to carry out grinding a described end face of the both ends of the surface of a described end face of the first cuboid (1), the second cuboid (2), the 3rd cuboid (3);
By evenly installing metal dust additional on the corresponding surface of complete three cuboids of grinding, two corresponding faces are bonded together, and through three cuboid correspondences, are processed with screwed hole place successively with four screws, by three cuboids assembling lockings;
Three cuboids that assemble are directly put into vacuum drying oven and heat, adopt the temperature of 700 ℃-900 ℃
Heat-treat, by vacuum brazing, three cuboids are welded as a whole to form valve body, wherein weld opposite joint and be less than or equal to 0.05mm.
2. method according to claim 1, is characterized in that, processes described the first half through holes (21)
Step comprise:
Center in the described other end of the second cuboid (2) processes the first semicircle groove (21a);
On the axial direction of the first semicircle groove (21a), process successively a plurality of semi-circular grooves (211,212,213,214,215);
Wherein, the first semi-circular groove (211) is connected with described the first rectangular recess (23) and the second rectangular recess (24) respectively with the 5th cannelure (215), thereby described the first rectangular recess (23) and the second rectangular recess (24) are communicated with the first half through holes (21).
3. method according to claim 2, is characterized in that, described another at the second cuboid (2)
On one end face, process the 5th rectangular recess (25) that is positioned at the first semicircle groove (21a) side, and it is connected with the 3rd semi-circular groove (213) in described a plurality of semi-circular grooves.
4. method according to claim 3, is characterized in that, processes described the second half through holes (31)
Step comprise:
Center at the described end face of the 3rd cuboid (3) processes the second semicircle groove (31a), and it is corresponding with described the first semicircle groove (21a) position, thereby after docking with the described other end of the second cuboid (2), the described end face of the 3rd cuboid (3) forms valve hole (5);
On the axial direction of the second semicircle groove (31a), process successively a plurality of semi-circular grooves (311,312,313,314,315), and described semi-circular groove (311,312,313,314,315) is corresponding with a plurality of described semi-circular groove (211,212,213,214, the 215) position processing respectively, thereby after docking with the described other end of the second cuboid (2), the described end face of the 3rd cuboid (3) forms cannelure (51,52,53,54,55) on the described other end of the second cuboid (2).
5. method according to claim 4, it is characterized in that, at the described end face of the 3rd cuboid (3), process the 3rd rectangular recess (32) and the 4th rectangular recess (33) that lays respectively at the second semicircle groove (31a) both sides, wherein, the 3rd rectangular recess (32) is corresponding with described rectangular through-hole (22) position, the 4th rectangular recess (33) is corresponding with described the 5th rectangular recess (25) position and be communicated with the 3rd semi-circular groove (313) on side, thereby after the described end face of the 3rd cuboid (3) docks with the described other end of the second cuboid (2), the 4th rectangular recess (33) docks formed groove with the 5th rectangular recess (25) and is connected with the 3rd cannelure (53) in described a plurality of cannelures.
6. method according to claim 5, is characterized in that, the step of processing a plurality of described actuator ports (6) comprising:
On the 3rd described other end of cuboid (3), process successively four actuator ports (61,62,63,64), wherein, the first actuator port (61) is connected with described the 3rd rectangular recess (32), the second actuator port (62), the 4th actuator port (64) respectively with described a plurality of cannelures in the second cannelure (52), the center of the 4th cannelure (54) be connected, the 3rd actuator port (63) is connected with the 3rd cannelure (53), thereby actuator port (6) is connected with described valve hole (5).
7. method according to claim 1, is characterized in that, the step of described combined treatment also comprises:
To the valve body carrying out after voltage-withstand test, use grinding machine to carry out grinding to peripheral surface.
8. one kind according to the prepared high-performance ratio of the manufacture method servo valve valve body described in claim 1-7 any one.
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| CN104002103B (en) * | 2014-05-29 | 2016-08-31 | 贵州遵义驰宇精密机电制造有限公司 | A kind of processing method of double spool electromagnetic pilot valve body |
| CN104819328B (en) * | 2015-04-24 | 2017-06-13 | 南通华东油压科技有限公司 | Pumping valve casting valve body |
| CN107775289A (en) * | 2017-10-25 | 2018-03-09 | 江苏金山动力科技有限公司 | Hollow valve for filling low-melting alloy and preparation method thereof |
| CN108637593B (en) * | 2018-03-21 | 2019-10-08 | 武汉船用机械有限责任公司 | A kind of production method of the conduit of full-rotating rudder paddle |
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| DE2046980A1 (en) * | 1970-09-24 | 1972-03-30 | Kracht Pumpen Motoren | Housing for hydraulic control valves with at least one piston control valve |
| US5235746A (en) * | 1992-03-19 | 1993-08-17 | Atlas Fluid Controls Inc. | Method of manufacturing a high-capacity servo valve body |
| US5487409A (en) * | 1993-07-24 | 1996-01-30 | Festo Kg | Spool valve |
| CN1407264A (en) * | 2001-08-28 | 2003-04-02 | 速睦喜股份有限公司 | Valve body and its manufacture |
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| DE2046980A1 (en) * | 1970-09-24 | 1972-03-30 | Kracht Pumpen Motoren | Housing for hydraulic control valves with at least one piston control valve |
| US5235746A (en) * | 1992-03-19 | 1993-08-17 | Atlas Fluid Controls Inc. | Method of manufacturing a high-capacity servo valve body |
| US5487409A (en) * | 1993-07-24 | 1996-01-30 | Festo Kg | Spool valve |
| CN1407264A (en) * | 2001-08-28 | 2003-04-02 | 速睦喜股份有限公司 | Valve body and its manufacture |
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| CN102642117A (en) | 2012-08-22 |
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Address after: 030600 Xingye street, Yuci Industrial Park, Jinzhong, Shanxi Applicant after: Shanxi Sipurui Machinery Manufacturing Co., Ltd. Address before: 030600 Xingye street, Yuci Industrial Park, Jinzhong, Shanxi Applicant before: Shanxi Sipurui Machinery Manufacture Co., Ltd. |
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