CN201973248U - Hollow valve plug and powder material forming system - Google Patents
Hollow valve plug and powder material forming system Download PDFInfo
- Publication number
- CN201973248U CN201973248U CN 201120035739 CN201120035739U CN201973248U CN 201973248 U CN201973248 U CN 201973248U CN 201120035739 CN201120035739 CN 201120035739 CN 201120035739 U CN201120035739 U CN 201120035739U CN 201973248 U CN201973248 U CN 201973248U
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- valve
- hole
- vacuum
- valve seat
- valve body
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Abstract
The utility model provides a hollow valve plug and a powder material forming system. The hollow valve plug comprises a valve seat, a valve body, a valve bonnet, a valve rod, a valve core, a vacuum joint and a manual or mechanical rotating device, wherein the valve seat is provided with a valve seat through hole; the valve body is hermetically connected with the valve seat and provided with a valve body cavity and a valve body through hole, and the valve cavity can be communicated with the valve body through hole and the valve seat through hole; the valve bonnet is hermetically connected with the valve body; the valve rod penetrates the valve bonnet and the valve body, moves in the first direction, includes an inner end in the valve body and an outer end outside the valve body, and is provided with a valve rod screw thread; the valve core is connected with the inner end of the valve rod and can move in the first direction, so as to selectively open/close the valve seat through hole; the vacuum joint is integrated with or hermetically connected with the valve body, and is communicated with the valve body through hole, therefore the valve body cavity of the valve body can be hermetically connected with a vacuum system through the vacuum joint; and the manual or mechanical rotating device is fastened at the outer end of the valve rod, and can enable the valve rod to rotate around the first direction so as to move in the first direction through the valve rod screw thread.
Description
Technical field
The dusty material formation system that the utility model relates to a kind of vacuum valve plug and comprises this vacuum valve plug.
Background technique
In the dusty material forming process, used elastic caoutchouc mould will be immersed in the superhigh-pressure high-temp liquid fully and keep certain hour, and therefore, requirement superhigh-pressure high-temp liquid in forming process must not leak and enter the elastic caoutchouc mould, to avoid polluted product.
In addition, in order to reduce defectives such as bubble in the back product that is shaped, hole, requirement vacuumizes the die cavity of elastic caoutchouc mould, this just requires to install the vacuum valve plug on the elastic caoutchouc mould, this valve plug should not only can connect vacuum system with realize vacuumizing, to filter and be shaped after the pressure release function, also want to play seal action can be in immersing superhigh-pressure high-temp liquid the time, to prevent causing product rejection because of liquid enters in the elastic caoutchouc mould.
In addition, this valve plug also should have filtering function, preventing that the solid material in the elasticity rubber pattern is sucked out in vacuum, and filtration wherein should be able under ultra-high voltage environment, work long hours and indeformable, do not damage.
Existing vaccum stop valve, as needle-valve, ball valve etc., can't be at the high temperature in the material forming process (100 ℃～200 ℃), ultrahigh pressure (50Mpa～150Mpa) use under the environment, the interface of valve mostly is screw thread or form of flanges, can't be directly and the elastic caoutchouc mould be tightly connected, and valve itself does not have filtering function yet.
Summary of the invention
At above prior art problems, embodiment of the present utility model provides a kind of vacuum valve plug, its can in the dusty material forming process, realize vacuumizing, filter and be shaped after the pressure release function, and can realize reliable sealing.
According to the utility model, a kind of vacuum valve plug is provided, it is characterized in that, comprising:
Valve seat, it has valve seat through-hole;
Valve body, it is sealably coupled to valve seat and has body cavity and valve hole, and body cavity can be communicated to valve hole and valve seat through-hole;
Bonnet, it is sealably coupled to valve body;
Valve rod, it passes bonnet and valve body and can move along first direction, and valve rod comprises and is in the inner in the valve body and is in the outer outer end of valve body and has threaded stem;
Spool, it is connected to the inner of valve rod and can moves with opening and closing valve seat through-hole optionally along first direction;
Vacuum connect, itself and valve body become one or are tightly connected, and are communicated with valve hole, make the body cavity of valve body to be sealably coupled to vacuum system by vacuum connect;
Manual or motor-driven rotating device, it is fastened to the outer end of valve rod, and can make valve rod center on the first direction rotation to move along first direction by threaded stem.
The utility model also provides a kind of dusty material formation system, it is characterized in that, comprising:
Foregoing vacuum valve plug;
Vacuum system, it is sealably coupled to described vacuum valve plug by described vacuum connect;
The dusty material forming die, it has the mould material feeding mouth;
Wherein, be installed in the described mould material feeding mouth valve base sealing of described vacuum valve plug and be connected to the inside of described dusty material forming die by described valve seat through-hole.
By each embodiment's of the utility model technological scheme, produce following good effect:
1. realized the function of vaccum stop valve and heat-resisting high pressure resistant valve plug simultaneously, compact structure, installation and easy to operate, using effect is good;
2. reliable sealing, can not only guarantee to vacuumize the degree of vacuum that reaches higher, and in dusty material is shaped, can not cause expensive material to be scrapped owing to the valve leakage makes outside liquid enter the dusty material forming die, thus reduce production costs, improve the production up-to-standard rate.
3. can place superhigh-pressure high-temp liquid to work for a long time and do not influence its performance, prolong the working life of vacuum valve plug.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technological scheme of the prior art, below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in below describing only is embodiments more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other embodiment and accompanying drawing thereof according to these accompanying drawing illustrated embodiments.
Fig. 1 is first embodiment's of a vacuum valve plug of the present utility model stereogram;
Fig. 2 is second embodiment's of a vacuum valve plug of the present utility model sectional view;
Fig. 3 is a structural representation of going up the embodiment of filtration shown in Figure 2;
Fig. 4 is the embodiment's of filtration a structural representation down shown in Figure 2.
Embodiment
Below with reference to accompanying drawing each embodiment's of the utility model technological scheme is carried out clear, complete description, obviously, described embodiment only is a part of embodiment of the present utility model, rather than whole embodiments.Based on the embodiment in the utility model, those of ordinary skills are resulting all other embodiments under the prerequisite of not making creative work, all belong to the scope that the utility model is protected.
As shown in Figure 1, in first embodiment of the present utility model, the vacuum valve plug comprises: valve seat 16, valve body 6, bonnet 7, valve rod 9, the rotating device of vacuum connect 15 and manual or motor-driven (for example electronic) (being handle 8 in first embodiment shown in Fig. 1).Wherein, preferably sealed connects between each parts.In application, rotating device can make valve rod 9 around first direction (promptly, it is axial) rotation and by the threaded stem (not shown) on the valve rod 9 be converted into valve rod 9 along the moving up and down of first direction, to realize opening and closing by the vacuum air-channel of vacuum connect 15.
For internal structure and the working principle thereof that vacuum valve plug of the present utility model is described better, below will second embodiment of the present utility model be described with further reference to the sectional view of Fig. 2.
As shown in Figure 2, in second embodiment of the present utility model, the vacuum valve plug comprises:
Valve rod 9, it passes bonnet 7 and valve body 6 also can be along first direction (promptly, valve rod 9 axially, vertical direction as shown in fig. 1) move, valve rod 9 comprise be in the inner (being the lower end shown in Fig. 2) in the valve body 6 and be in valve body 6 outward outer end (being the upper end shown in Fig. 2) and have threaded stem;
Vacuum connect 15, itself and valve body 6 become one or are tightly connected, and are communicated with valve hole, make the body cavity of valve body 6 to be sealably coupled to the vacuum system (not shown) by vacuum connect 15;
Manual or motor-driven rotating device (in second embodiment shown in Fig. 2, being handle 8), it is fastened to the outer end of valve rod 9, and valve rod 9 is rotated to move along first direction by threaded stem around first direction (that is vertical direction as shown in fig. 1).
In concrete the application, the vacuum valve plug can be used for according in the dusty material formation system of the present utility model, wherein, the valve seat 16 of vacuum valve plug is installed in the mould material feeding mouth 18 (in Fig. 1 by shown in the dotted line) of dusty material forming die hermetically and is connected to the inside of dusty material forming die by valve seat through-hole.
Like this, since valve rod 9 can be under the effect of rotating device (for example handle 8) rotation vertically and the threaded stem by valve rod 9 rotatablely moving of self is converted into along vertically moving, thereby can control vertically moving of valve rod 9 as required and drive spool 5 and in body cavity, vertically move, thereby optionally the opening and closing valve seat through-hole is to operate accordingly:
When needs vacuumize, the rotation rotating device moves up upwards to drive spool 5 valve rod 9, make spool 5 break away from the edge of opening of valve seat through-holes and open valve block hole and make valve seat through-hole be communicated with valve hole (and coupled vacuum connect 15) by body cavity, make vacuum valve seat inside be connected to vacuum system thus by body cavity and vacuum connect 15, promptly, vacuum air-channel is open-minded, can carry out vacuum pumping thus;
When not needing to vacuumize, rotate rotating device and make valve rod 9 move down the following spool 5 that pushes away, make spool 5 sealing be pressed on the edge of opening of valve seat through-hole and the cut-off valve block hole, forbid that thus the valve seat internal communication is to body cavity, promptly, vacuum air-channel turn-offs, and prevents that outside liquid from penetrating in the inside of coupled dusty material forming die by valve seat.Under this closed condition, valve rod 9 is because the effect of threaded stem the effect of threaded stem and the formed screw pair of valve body internal thread (that is, by) and be self-locking in closed position.
In each embodiment of the present utility model, among example second embodiment as shown in FIG. 2, for prevent in vacuum pumping will the material in the inside of dusty material forming die by coupled valve seat suction vacuum valve plug or vacuum system in, preferably, the vacuum valve plug also comprises:
Filter assemblies, its sealing are installed in the end recess of described valve seat 16 or with described valve seat 16 and become one, and described filter assemblies comprises at least one filtering hole that links to each other with described valve seat through-hole.
In each embodiment of the present utility model, preferably, filter assemblies can comprise: the superimposed filtration of two-layer at least mutual sealing, adjacent filtration comprise measure-alike or different and aim at mutually or the filtering hole of misalignment.
In each embodiment of the present utility model, preferably, in each filtration, described filtering hole distributes along a plurality of concentric circles, at least one of adjacent filtration has the annular or the semiorbicular sealing imbrication structure of protrusion between the neighboring concentric circle, make the filtering hole of adjacent filtration separate a segment distance.
In the embodiment shown in Figure 2, filter assemblies seals in the end recess that is installed in valve seat 16 (it preferably is fixed to valve seat 16 by screw 17), and comprise the superimposed filtration of two-layer mutual sealing (on being filtration 2 and following filtration 1) in Fig. 2, adjacent filtration comprises measure-alike or different and aims at mutually or the filtering hole of misalignment, like this, the inside that not only makes the dusty material forming die in vacuum pumping keeps being communicated with via vacuum valve plug and vacuum system by described filtering hole, and prevents that the material in the inside of dusty material forming die is drawn in vacuum valve plug or the vacuum system.
In a preferred embodiment, the structure of last filtration 2 and following filtration 1 can be as shown in Fig. 3 and 4, and in each filtration, described filtering hole can distribute along a plurality of concentric circles.In the embodiment shown in Fig. 3 and 4, last filtration 2 has a protrusion between neighboring concentric circle ring packing imbrication structure (promptly, filtering hole is in the annular groove that forms between the adjacent annular sealing imbrication structure), following filtration 1 then is not provided with the ring packing imbrication structure of protrusion.The ring packing imbrication structure of this protrusion makes the filtering hole of adjacent filtration separate a segment distance, thereby makes aforesaid vacuum air-channel keep unimpeded in vacuum pumping.
Preferably, the filtering hole of adjacent filtration is staggered (that is, not aiming at mutually), to prevent in the direct suction vacuum valve plug of material quilt or vacuum system in the dusty material forming die.The material that enters in the filtering hole can be removed easily.
Preferably, the size of the many groups filtering hole that distributes along concentric circle can be different, and for example, the size of outer ring filtering hole is less than the size of inner ring filtering hole, to prevent better the direct suction of the material in the inside of dusty material forming die.
Preferably, each filtration of filter assemblies is made by the material (for example stainless steel) of high-temperature-resistant high-pressure-resistant, mainly is impaired under the superhigh-pressure high-temp environment in order to prevent filtration.
Refer again to Fig. 2, in each embodiment of the present utility model, preferably, the interior protuberance of described T type groove that is in that spool 5 can have T type groove and the inner (lower end among Fig. 2) by described T type groove and described valve rod 9 articulates.Like this, no matter valve rod 9 moves up or moves down, and all can drive spool 5 and carry out corresponding moving.Preferably, the inner protuberance of the T type groove of spool 5 and valve rod 9 does not have pivotally and articulates.
In each embodiment of the present utility model, among example second embodiment as shown in FIG. 2, in order to guarantee sealing when the spool 5 cut-off valve block holes, preferably, spool the inner (spool lower end as shown in Figure 2) that described spool 5 is opposite with described T type groove has the sealing cone towards described valve seat through-hole convergent.Like this, but when the sealing cone of spool 5 by spool the inner compresses the edge of seal valve seat via openings downwards the tight closing valve seat through-hole.
In each embodiment of the present utility model, among example second embodiment as shown in FIG. 2, in order to guarantee sealing when the spool 5 cut-off valve block holes, preferably, the edge towards the valve seat through-hole port of described spool 5 of described valve seat through-hole has sealing cone or the sealing convex surface that the sealing cone with described spool the inner is complementary.Like this, but when the sealing cone of spool 5 by spool the inner compresses edge with the seal valve seat via openings downwards the tight closing valve seat through-hole.
For aforementioned sealing between spool the inner and valve seat through-hole edge of opening, inner and the valve seat through-hole edge of opening of spool seals one of at least can have sealing cone or sealing convex surface (for example rolling) in the part that contacts mutually, like this, the two can guarantee sealing by certain local deformation (for example only producing resiliently deformable) when compressing sealing.Preferably, spool the inner seals the part that contacts mutually with the valve seat through-hole edge of opening and has different hardness, and like this, the two can guarantee sealing by certain local deformation (for example producing resiliently deformable and a small amount of plastic deformation) when compressing sealing; More preferably, owing to spool 5 complex-shaped processed and is difficult for, thereby the hardness that makes spool 5 greater than the hardness of valve seat through-hole edge of opening to prolong the working life of spool 5.
Preferably, adopt the conical surface to seal firmly between spool 5 and the valve seat through-hole, two sealing cones of corresponding cooperation take different heat treatment modes to obtain different hardness, and two sealing cones are through facing-up, to guarantee the tight mutually sealing of fitting.
In each embodiment of the present utility model, among example second embodiment as shown in FIG. 2, preferably, the vacuum valve plug comprises: pressure ring 12, O-ring seals 13 and back-up ring 14, it seals successively and is arranged between described bonnet 7 and the described valve body 6, to realize being tightly connected of bonnet 7 and valve body 6.Preferably, two groups of fluororubber O shape seal rings 13 and 14 combinations of teflon back-up ring are adopted in the sealing of valve rod 9, and make O-ring seals 13 be in impaction state by bonnet 7 and pressure ring 12, good sealing effect, reach higher degree of vacuum in the time of can guaranteeing to vacuumize and do not leak, and fluororubber O shape circle can be under 200 ℃ of temperature environments long-term work and do not influence sealing effect.
In each embodiment of the present utility model, among example second embodiment as shown in FIG. 2, preferably, the vacuum valve plug comprises: sealing is arranged on the sealing gasket 4 between valve body 6 and the valve seat 16, and it for example is a polytetrafluoroethylene sealing gasket 4.
In each embodiment of the present utility model, among example second embodiment as shown in FIG. 2, preferably, have the inner chamber circular groove on the body cavity of described valve body 6, the space on described spool 5 of described body cavity can be communicated to described vacuum connect 15 by described inner chamber circular groove.By such structure, when the vacuum valve plug immerses in the superhigh-pressure high-temp liquid, outside liquid can under high pressure pass through vacuum connect 15, valve hole, enter fast in the body cavity in the space on the spool 5 with described inner chamber circular groove, thereby valve body 6 inside and outside pressure are equated and variation synchronously, make the sealing of spool 5 rely on the pretightening force that valve rod 9 provides no longer fully thus, thereby the screw pair interaction force between valve rod 9 and the valve body 6 is significantly reduced, reduced the possibility of screw thread distortion and fatigue damage, thereby effectively improved the sealing reliability of vacuum valve plug and prolonged its working life.
In each embodiment of the present utility model, among example second embodiment as shown in FIG. 2, preferably, rotating device (for example handle 8) is fastened to valve rod 9 by nut 10 (preferably also comprising packing ring 11).
In each embodiment of the present utility model, among example second embodiment as shown in FIG. 2, preferably, vacuum connect 15 is pagoda mouth joints.
The utility model also provides a kind of dusty material formation system, it is characterized in that, comprising:
Vacuum valve plug described in the arbitrary embodiment of the utility model;
Vacuum system, it is sealably coupled to described vacuum valve plug by described vacuum connect 15;
The dusty material forming die, it has mould material feeding mouth 18;
Wherein, the valve seat 16 of described vacuum valve plug is installed in the described mould material feeding mouth 18 hermetically and is connected to the inside of described dusty material forming die by described valve seat through-hole.
Preferably, in each embodiment of the present utility model, in order to ensure being tightly connected of dusty material forming die and vacuum valve plug valve seat, the dusty material forming die is flexible, is for example made by elastic caoutchouc.
Preferably, in each embodiment of the present utility model, in order to ensure being tightly connected of dusty material forming die and vacuum valve plug valve seat, the two is tightly connected by securing means (for example clip 3).
By each embodiment's of the utility model technological scheme, produce following good effect:
1. realized the function of vaccum stop valve and heat-resisting high pressure resistant valve plug simultaneously, compact structure, installation and easy to operate, using effect is good;
2. reliable sealing, can not only guarantee to vacuumize the degree of vacuum that reaches higher, and in dusty material is shaped, can not cause expensive material to be scrapped owing to the valve leakage makes outside liquid enter the dusty material forming die, thus reduce production costs, improve the production up-to-standard rate.
3. can place superhigh-pressure high-temp liquid to work for a long time and do not influence its performance, prolong the working life of vacuum valve plug.
The above only is an embodiment of the present utility model; but protection domain of the present utility model is not limited thereto; the variation that any those skilled in the art of the present technique can expect in the scope of the technology contents that the utility model discloses easily or be equal to replacement scheme all should be encompassed within the protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.
Claims (10)
1. a vacuum valve plug is characterized in that, comprising:
Valve seat (16), it has valve seat through-hole;
Valve body (6), it is sealably coupled to described valve seat (16) and has body cavity and valve hole, and described body cavity can be communicated to described valve hole and described valve seat through-hole;
Bonnet (7), it is sealably coupled to described valve body (6);
Valve rod (9), it passes described bonnet (7) and described valve body (6) and can move along first direction, and described valve rod (9) comprises and is in the inner in the described valve body (6) and is in the outer outer end of described valve body (6) and has threaded stem;
Spool (5), it is connected to the inner of described valve rod (9) and can moves with the described valve seat through-hole of opening and closing optionally along described first direction;
Vacuum connect (15), itself and described valve body (6) become one or are tightly connected, and are communicated with described valve hole, make the body cavity of described valve body (6) to be sealably coupled to vacuum system by described vacuum connect (15);
Manual or motor-driven rotating device (8), it is fastened to the outer end of described valve rod (9), and described valve rod (9) is rotated to move along described first direction by described threaded stem around described first direction.
2. vacuum valve plug as claimed in claim 1 is characterized in that, comprising:
Filter assemblies, its sealing are installed in the end recess of described valve seat (16) or with described valve seat (16) and become one, and described filter assemblies comprises at least one filtering hole that links to each other with described valve seat through-hole.
3. vacuum valve plug as claimed in claim 2 is characterized in that, described filter assemblies comprises: the superimposed filtration of two-layer at least mutual sealing, adjacent filtration comprise measure-alike or different and aim at mutually or the filtering hole of misalignment.
4. vacuum valve plug as claimed in claim 3, it is characterized in that, in each filtration, described filtering hole distributes along a plurality of concentric circles, at least one of adjacent filtration has the annular or the semiorbicular sealing imbrication structure of protrusion between the neighboring concentric circle, make the filtering hole of adjacent filtration separate a segment distance.
5. as each described vacuum valve plug in the claim 1 to 4, it is characterized in that the interior protuberance of described T type groove that is in that described spool (5) has T type groove and the inner by described T type groove and described valve rod (9) articulates.
6. as each described vacuum valve plug in the claim 1 to 4, it is characterized in that spool the inner that described spool (5) is opposite with described T type groove has the sealing cone towards described valve seat through-hole convergent.
7. vacuum valve plug as claimed in claim 6 is characterized in that, the edge towards the port of the valve seat through-hole of described spool (5) of described valve seat through-hole has sealing cone or the sealing convex surface that the sealing cone with described spool the inner is complementary.
8. as each described vacuum valve plug in the claim 1 to 4, it is characterized in that, comprising:
Pressure ring (12), O-ring seals (13) and back-up ring (14), it seals successively and is arranged between described bonnet (7) and the described valve body (6).
9. as each described vacuum valve plug in the claim 1 to 4, it is characterized in that, have the inner chamber circular groove on the body cavity of described valve body (6), the space on described spool (5) of described body cavity can be communicated to described vacuum connect (15) by described inner chamber circular groove.
10. a dusty material formation system is characterized in that, comprising:
As each described vacuum valve plug among the claim 1-9;
Vacuum system, it is sealably coupled to described vacuum valve plug by described vacuum connect (15);
The dusty material forming die, it has mould material feeding mouth (18);
Wherein, the valve seat of described vacuum valve plug (16) is installed in the described mould material feeding mouth (18) hermetically and is connected to the inside of described dusty material forming die by described valve seat through-hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120035739 CN201973248U (en) | 2011-02-10 | 2011-02-10 | Hollow valve plug and powder material forming system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120035739 CN201973248U (en) | 2011-02-10 | 2011-02-10 | Hollow valve plug and powder material forming system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201973248U true CN201973248U (en) | 2011-09-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120035739 Expired - Lifetime CN201973248U (en) | 2011-02-10 | 2011-02-10 | Hollow valve plug and powder material forming system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201973248U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102717072A (en) * | 2012-05-30 | 2012-10-10 | 自贡硬质合金有限责任公司 | Die and die assembly method |
| CN102927360A (en) * | 2012-10-31 | 2013-02-13 | 北京控制工程研究所 | Dynamic seal structure of satellite valve |
| CN103471764A (en) * | 2013-09-26 | 2013-12-25 | 张家港韩中深冷科技有限公司 | Device for testing vacuum degree of interlayer of automotive liquefied natural gas cylinder |
| CN104373605A (en) * | 2014-10-16 | 2015-02-25 | 中国工程物理研究院化工材料研究所 | Ultrahigh pressure proportional pressure relief valve |
| 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 |
-
2011
- 2011-02-10 CN CN 201120035739 patent/CN201973248U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102717072A (en) * | 2012-05-30 | 2012-10-10 | 自贡硬质合金有限责任公司 | Die and die assembly method |
| CN102927360A (en) * | 2012-10-31 | 2013-02-13 | 北京控制工程研究所 | Dynamic seal structure of satellite valve |
| CN103471764A (en) * | 2013-09-26 | 2013-12-25 | 张家港韩中深冷科技有限公司 | Device for testing vacuum degree of interlayer of automotive liquefied natural gas cylinder |
| CN104373605A (en) * | 2014-10-16 | 2015-02-25 | 中国工程物理研究院化工材料研究所 | Ultrahigh pressure proportional pressure relief valve |
| 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 |
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| GR01 | Patent grant | ||
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Granted publication date: 20110914 |