CN204153161U - The seal arrangement of dark bar ultralow temperature stop valve - Google Patents
The seal arrangement of dark bar ultralow temperature stop valve Download PDFInfo
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- CN204153161U CN204153161U CN201420597733.3U CN201420597733U CN204153161U CN 204153161 U CN204153161 U CN 204153161U CN 201420597733 U CN201420597733 U CN 201420597733U CN 204153161 U CN204153161 U CN 204153161U
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Abstract
The seal arrangement of dark bar ultralow temperature stop valve, comprise valve body, valve gap, inertance tube, valve rod and handwheel, valve body left end and right-hand member are respectively equipped with into connection mouth and go out connection mouth, valve body upper-end surface is connected by flange bolt with valve gap lower end surface, valve gap upper end is fixedly connected with inertance tube lower end, and valve rod lower end passes perpendicularly through inertance tube and valve gap extend in valve body, and handwheel is located at valve rod upper end, described valve rod lower end is provided with lower seal structure, is provided with sealing configuration between inertance tube upper end and valve rod; Valve gap inside is provided with the female connecting sleeve of tool, and valve rod to be located in connecting sleeve and to be threaded with connecting sleeve.The utility model is reasonable in design, and structure is simple, and good airproof performance, safety reliability increases greatly, greatly meets the working condition of cryogenic media, extends the working life of cryogenic globe valve.
Description
Technical field
The utility model belongs to valve manufacturing technology field, particularly relates to a kind of seal arrangement of dark bar ultralow temperature stop valve.
Background technique
The valve rod of conventional stop valve has dark bar and rising stem (RS.) two kinds of structural types, and the Stem Mut of rising stem (RS.) structure is on valve top, and valve rod slenderness ratio is greater than dark bar structure, and slenderness ratio is larger, and stem shaft is poorer to force-bearing situation, and valve rod easily bends, and causes flap not easily to seal.The advantage of rising stem (RS.) structure can be designed to sealing configuration simply at valve rod and bonnet lower.The threaded stem of dark bar structure is embedded in valve gap inside, and advantage is that power transmission screw thread is less to end distance, and valve rod is better stressed, and not flexible, flap easily seals.Shortcoming is between valve rod and valve gap, arrange sealing configuration difficulty.
Be extended to the ultralow temperature stop valve in ultralow temperature media applications field, valve gap must be increased with inertance tube, and the object of increasing is temperature >=0 DEG C, filler place for ensureing top, and hardening inefficacy after avoiding filler to touch ultralow temperature medium, causes cryogenic media to leak.Simultaneously for avoiding filler Long contact time cryogenic media, should sealing configuration being set, cutting off cryogenic media.In sum, the shortcoming of the stem structure pattern of conventional stop valve is more obvious, is summarized as following several defect:
1, the valve rod slenderness ratio of rising stem (RS.) structure is excessive, and closedown moment is excessive, and valve rod is very easily bending, and flap not easily seals.
2, the valve rod of rising stem (RS.) structure hermetically closing in rotation rising terminal, the existing axial pressure of sealing pair, has again sealing pair relative sliding frictional force, and sealing surface very easily damages and causes leakage.
3, on valve rod during hermetically closing, an enclosed space is defined between valve gap, inertance tube, stuffing box, when valve gap long-neck exposed part contact external environment condition, after absorbing heat, cryogenic media vaporization volumetric expansion, cause valve gap neck confined space pressure to raise, valve gap can be caused to be out of shape, have an accident.
4, the ultralow temperature stop valve of dark bar structure, does not have positively-acting upper sealing configuration reliably, and after the filler Long contact time ultralow temperature medium of top, the hardening inefficacy that becomes fragile of meeting, causes cryogenic media to leak.
In a word, should need badly for above problem and ultralow temperature stop valve up-sealed structure is designed, improve the working life of cryogenic globe valve, meet the working condition of cryogenic media.
Model utility content
The utility model in order to solve deficiency of the prior art, provide a kind of seal reliable, Security is high, the seal arrangement of the dark bar ultralow temperature stop valve of long service life.
For solving the problems of the technologies described above, the utility model adopts following technological scheme: the seal arrangement of dark bar ultralow temperature stop valve, comprise valve body, valve gap, inertance tube, valve rod and handwheel, valve body left end and right-hand member are respectively equipped with into connection mouth and go out connection mouth, valve body upper-end surface is connected by flange bolt with valve gap lower end surface, valve gap upper end is fixedly connected with inertance tube lower end, valve rod lower end passes perpendicularly through inertance tube and valve gap extend in valve body, handwheel is located at valve rod upper end, described valve rod lower end is provided with lower seal structure, is provided with sealing configuration between inertance tube upper end and valve rod; Valve gap inside is provided with the female connecting sleeve of tool, and valve rod to be located in connecting sleeve and to be threaded with connecting sleeve;
Described lower seal structure comprises flap, flap upper-end surface is provided with connecting groove, valve rod lower end is plugged in connecting groove, valve rod lower end cylindrical offers one circular groove, what be provided with in circular groove that external diameter is greater than valve rod external diameter splits annulus, flap upper-end surface is provided with the flap gland extending into and compress in connecting groove and split annulus, flap upper-end surface circle edge is along being provided with upper baffle ring, seal ring is provided with in the circular groove formed between upper baffle ring and flap gland, upper seal ring inner peripheral surface and all big up and small down conical structure of flap gland upper end cylindrical, flap gland upper end cylindrical and upper seal ring inner ring top press fit, valve gap lower end surface is provided with the upper annular flange be sealed and matched with upper seal ring upper surface, be provided with in valve body and there is surface thereof section, the dunnage of middle horizontal segment and the section of having a down dip, the middle horizontal segment of dunnage is provided with through hole and is positioned at the lower annular flange of through hole upper edge, flap lower surface central authorities and lower surface circle edge are along being respectively equipped with stud and lower baffle ring, on stud, cover has pressing plate, stud is threaded for the tightening nut of clamping platen lower surface, lower seal is provided with between lower baffle ring and pressing plate, lower seal inner peripheral surface and pressing plate outer peripheral surface are all in lower large little conical structure, pressing plate outer ring and the top press fit of lower seal inner ring, lower seal lower surface and lower annular flange up and down corresponding also in off position lower seal coordinate,
Described upper sealing configuration comprises the cylindrical shell be set in outside inertance tube, cylindrical shell upper-end surface is higher than inertance tube upper-end surface, cylinder inboard wall is provided with the annulus block contacted with inertance tube upper-end surface, combined cone filler and piston type filler pressing sleeve is provided with in the annular chamber formed between cylindrical shell and valve rod, the outer wall of piston type filler pressing sleeve is provided with the outer O type circle be sealed and matched with cylinder inboard wall, O type circle in the inwall of piston type filler pressing sleeve is provided with and is sealed and matched with valve rod outer wall, cylindrical shell top external peripheral threads is connected with filler pressure cap and locking nut, filler pressure cap top lower surface and piston type filler pressing sleeve compression fit, locking nut and filler pressure cap lower end surface compression fit.
Described combined cone filler is provided with two groups from top to bottom, often organize combined cone filler and include the upper filler cover that the lower filler cover of the big up and small down conical structure of endoporus and cylindrical present little lower large conical structure, upper filler overlaps cylindrical and overlaps endoporus with lower filler and contact compression fit.
Adopt technique scheme, inertance tube sidepiece is provided with the pressure relief device be communicated with inertance tube inside.Described pressure relief device is located at barrel outer surface and is positioned at sustained height with annulus block, and annulus block is provided with the pore be communicated with pressure relief device.
Valve body external form is olive ball-type, and entering connection mouth and going out connection mouth of valve body is through-type structure point-blank, for SOCKET WELDING is connected between valve rod with valve gap.The length of inertance tube meets the requirement making temperature >=0, filler place DEG C, the wall thickness according calculation pressure requirements of inertance tube.Valve gap and valve body are that flange bolt is connected, and set up the thermal shrinkage during operation of spring washer recuperation valve body component between valve gap and valve body.Valve rod is the rotation and lifting bar of dark bar structure, and the connecting sleeve be connected with threaded stem is embedded in valve gap inside, and the stressed helical thread portion of valve rod is less to valve rod underpart distance, and closedown moment is relatively little.Between valve rod upper end and inertance tube, sealing configuration is set, can the stem diameter of selection of small.
Flap is that axle can 360 ° of rotations with valve rod, and has the gap of about 0.5mm between flap gland and valve rod, flap can slightly be swung, and flap does not come off, seals necessary degrees of freedom in order to meet flap.Flap upper-end surface and lower end surface are all inlaid with the upper seal ring and lower seal be made up of CTFE (PCTFE) material, can use for a long time in the cryogenic media of-200 DEG C, the flap gland of upper seal ring with conical external circle is pressed on flap upper-end surface, flap gland Cock screw is fixed on flap, prevents from loosening.The upper baffle ring of flap upper-end surface cylindrical through being rolled into, prevents seal ring from coming off, and forms dynamic upper sealing pair.Bonnet lower to have on a circle annular flange through be processed into circular arc quiet on sealing pair.Valve rod rotarily drives flap and rises, and quiet motive sealing pair is combined, and apply moment by handwheel, formation can top sealing configuration.
The combined cone filler CTFE (PCTFE) of selecting lower temperature resistance excellent is special to be formed, and is self-tightening sealing structure.Lower filler cover has up big and down small inner conical surface, and upper filler cover has up big and down small male cone (strobilus masculinus), and the cylindrical of upper filler cover and lower filler cover engages with cylinder inboard wall, and the inner circle of filler cover and lower filler cover engages with valve rod outer wall.When screwing off filler pressure cap, the conical surface close contact of upper filler cover and lower filler cover, forms sealing, and lower filler cover cylindrical is outwards out of shape, and hold-down barrel inwall, forms external sealed; Upper filler cover inner circle, to internal strain, compresses valve rod cylindrical, sealing in being formed.After filler pressure cap pretension, when the pressure of neck raises, lower filler cover has the trend of rising, filler cover in compression, and respectively to the Direction distortion being conducive to sealing, form self-tightening sealing, pressure is higher, and sealability is better.
For ensureing the sealing effect of valve rod, filler pressing sleeve inner and outer wall is slotted respectively, is respectively charged into interior O type circle and outer O type circle that silicone rubber makes, forms auxiliary seal to valve rod and cylindrical shell.Interior O type circle and outer O type circle can use for a long time in-60 DEG C of environment, as filler damages, occur minor leakage, and piston type filler pressing sleeve can protect that cryogenic media is unlikely to leak, and avoids causing the accident.
In cylindrical shell bottom, processing NPT pipe thread, installs pressure relief device, pressure relief device is existing ordinary elements, and concrete structure repeats no more, and pressure relief device debugs the drainage pressure of regulation on request, generally, the cracking pressure of pressure relief device is less than or equal to 90% of the nominal pressure of low temperature valve.Upper sealing configuration is closed, and when combined cone filler compresses, defines an enclosed space between valve gap, inertance tube, combined cone filler, valve gap exposed part contact external environment condition, absorb heat vaporization, the cryogenic media of inner chamber is vaporized through heat transfer, volumetric expansion, causes pressure to raise.When internal pressure reaches the cracking pressure of pressure relief device, pressure relief device is opened, and high pressure gas discharge is to low pressure vessel pipeline or to sky discharge, and when pressure falls back to 85% of cracking pressure, pressure relief device is closed, and protects that valve is unlikely has an accident.
In sum, the utility model is reasonable in design, and structure is simple, and good airproof performance, safety reliability increases greatly, greatly meets the working condition of cryogenic media, extends the working life of cryogenic globe valve.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the enlarged view at A place in Fig. 1;
Fig. 3 is the enlarged view at B place in Fig. 1.
Embodiment
As Fig. 1, shown in Fig. 2 and Fig. 3, dark bar ultralow temperature stop valve, comprise valve body 1, valve gap 2, inertance tube 5, valve rod 6 and handwheel 7, valve body 1 left end and right-hand member are respectively equipped with into connection mouth 3 and go out connection mouth 4, valve body 1 upper-end surface is connected by flange bolt with valve gap 2 lower end surface, valve gap 2 upper end is fixedly connected with inertance tube 5 lower end, valve rod 6 lower end passes perpendicularly through inertance tube 5 and valve gap 2 extend in valve body 1, handwheel 7 is located at valve rod 6 upper end, described valve rod 6 lower end is provided with lower seal structure, sealing configuration is provided with between inertance tube 5 upper end and valve rod 6, inertance tube 5 sidepiece is provided with the pressure relief device 8 be communicated with inertance tube 5 inside, valve gap 2 inside is provided with the female connecting sleeve 9 of tool, and valve rod 6 to be located in connecting sleeve 9 and to be threaded with connecting sleeve 9.
Lower seal structure comprises flap 10, flap 10 upper-end surface is provided with connecting groove, valve rod 6 lower end is plugged in connecting groove, valve rod 6 lower end cylindrical offers one circular groove, what be provided with in circular groove that external diameter is greater than valve rod 6 external diameter splits annulus 11, flap 10 upper-end surface is provided with the flap gland 12 extending into and compress in connecting groove and split annulus 11, flap 10 upper-end surface circle edge is along being provided with upper baffle ring 13, seal ring 14 is provided with in the circular groove formed between upper baffle ring 13 and flap gland 12, upper seal ring 14 inner peripheral surface and all big up and small down conical structure of flap gland 12 upper end cylindrical, flap gland 12 upper end cylindrical and the top press fit of upper seal ring 14 inner ring, valve gap 2 lower end surface is provided with the upper annular flange 15 be sealed and matched with upper seal ring 14 upper surface, be provided with in valve body 1 and there is surface thereof section, the dunnage 16 of middle horizontal segment and the section of having a down dip, the middle horizontal segment of dunnage 16 is provided with through hole 17 and is positioned at the lower annular flange 18 of through hole 17 upper edge, flap 10 lower surface central authorities and lower surface circle edge are along being respectively equipped with stud 19 and lower baffle ring 20, on stud 19, cover has pressing plate 21, stud 19 is threaded for the tightening nut 22 of clamping platen 21 lower surface, lower seal 23 is provided with between lower baffle ring 20 and pressing plate 21, lower seal 23 inner peripheral surface and pressing plate 21 outer peripheral surface are all in lower large little conical structure, pressing plate 21 outer ring and the top press fit of lower seal 23 inner ring, lower seal 23 lower surface corresponding with lower annular flange about 18 and in off position lower seal coordinate.
Upper sealing configuration comprises the cylindrical shell 24 be set in outside inertance tube 5, cylindrical shell 24 upper-end surface is higher than inertance tube 5 upper-end surface, cylindrical shell 24 inwall is provided with the annulus block 25 contacted with inertance tube 5 upper-end surface, combined cone filler 26 and piston type filler pressing sleeve 27 is provided with in the annular chamber formed between cylindrical shell 24 and valve rod 6, the outer wall of piston type filler pressing sleeve 27 is provided with the outer O type circle 28 coordinated with cylindrical shell 24 inner wall sealing, O type circle 29 in the inwall of piston type filler pressing sleeve 27 is provided with and is sealed and matched with valve rod 6 outer wall, cylindrical shell 24 top external peripheral threads is connected with filler pressure cap 30 and locking nut 31, filler pressure cap 30 top lower surface and piston type filler pressing sleeve 27 compression fit, locking nut 31 and filler pressure cap 30 lower end surface compression fit.
Combined cone filler 26 is provided with two groups from top to bottom, often organize combined cone filler 26 and include the upper filler cover 33 that the lower filler cover 32 of the big up and small down conical structure of endoporus and cylindrical present little lower large conical structure, upper filler overlaps 33 cylindricals and overlaps 32 endoporus with lower filler and contact compression fit.
Pressure relief device 8 is located at cylindrical shell 24 outer surface and is positioned at sustained height with annulus block 25, and annulus block 25 is provided with the pore 34 be communicated with pressure relief device 8.Owing to adding radial connection thickness, the installation of pressure relief device 8 can be convenient to like this.
Valve body 1 external form is olive ball-type, and entering connection mouth 3 and going out connection mouth 4 of valve body 1 is through-type structure point-blank, for SOCKET WELDING is connected between valve rod 6 with valve gap 2.The length of inertance tube 5 meets the requirement making temperature >=0, filler place DEG C, the wall thickness according calculation pressure requirements of inertance tube 5.Valve gap 2 for flange bolt is connected with valve body 1, is set up spring washer and is compensated the thermal shrinkage during operation of valve body 1 parts between valve gap 2 and valve body 1.Valve rod 6 is the rotation and lifting bar of dark bar structure, and it is inner that the connecting sleeve 9 be threaded with valve rod 6 is embedded in valve gap 2, and the stressed helical thread portion of valve rod 6 is less to valve rod 6 underpart distance, and closedown moment is relatively little.Between valve rod 6 upper end and inertance tube 5, sealing configuration is set, can valve rod 6 diameter of selection of small.
Flap 10 for axle can 360 ° of rotations, and has the gap of about 0.5mm with valve rod 6 between flap gland 12 and valve rod 6, flap 10 can slightly be swung, and flap 10 does not come off, seal necessary degrees of freedom in order to meet flap 10.Flap 10 upper-end surface and lower end surface are all inlaid with the upper seal ring 14 and lower seal 23 be made up of CTFE (PCTFE) material, can use for a long time in the cryogenic media of-200 DEG C, the flap gland 12 of upper seal ring 14 with conical external circle is pressed on flap 10 upper-end surface, flap gland 12 Cock screw is fixed on flap 10, prevents from loosening.The upper baffle ring 13 of flap 10 upper-end surface cylindrical through being rolled into, prevents seal ring 14 from coming off, and forms dynamic upper sealing pair.Valve gap 2 bottom to have on a circle annular flange 15 through be processed into circular arc quiet on sealing pair.Valve rod 6 rotarily drives flap 10 and rises, and quiet motive sealing pair is combined, and apply moment by handwheel 7, formation can top sealing configuration.
Combined cone filler 26 CTFE (PCTFE) of selecting lower temperature resistance excellent is special to be formed, and is self-tightening sealing structure.Lower filler cover 32 has up big and down small inner conical surface, and upper filler cover 33 has up big and down small male cone (strobilus masculinus), and the cylindrical of upper filler cover 33 and lower filler cover 32 engages with cylindrical shell 24 inwall, and the inner circle of filler cover and lower filler cover 32 engages with valve rod 6 outer wall.When screwing off filler pressure cap 30, the conical surface close contact of upper filler cover 33 and lower filler cover 32, form sealing, lower filler overlaps 32 cylindricals and is outwards out of shape, hold-down barrel 24 inwall, forms external sealed; Upper filler overlaps 33 inner circles to internal strain, compresses valve rod 6 cylindrical, sealing in being formed.After filler pressure cap 30 pretension, when the pressure of neck raises, lower filler cover 32 has the trend of rising, and filler cover 33 in compression, respectively to the Direction distortion being conducive to sealing, form self-tightening sealing, pressure is higher, and sealability is better.
For ensureing the sealing effect of valve rod 6, filler pressing sleeve inner and outer wall is slotted respectively, is respectively charged into interior O type circle 29 and outer O type circle 28 that silicone rubber makes, forms auxiliary seal to valve rod 6 and cylindrical shell 24.Interior O type circle 29 and outer O type circle 28 can use for a long time in-60 DEG C of environment, as filler damages, occur minor leakage, and piston type filler pressing sleeve 27 can protect that cryogenic media is unlikely to leak, and avoids causing the accident.
In cylindrical shell 24 bottom, processing NPT pipe thread, installs pressure relief device 8, pressure relief device 8 is existing ordinary elements, and concrete structure repeats no more, and pressure relief device 8 debugs the drainage pressure of regulation on request, generally, the cracking pressure of pressure relief device 8 is less than or equal to 90% of the nominal pressure of low temperature valve.Upper sealing configuration is closed, when combined cone filler 26 compresses, an enclosed space is defined between valve gap 2, inertance tube 5, combined cone filler 26, valve gap 2 exposed part contact external environment condition, absorption heat is vaporized, the cryogenic media of inner chamber is vaporized through heat transfer, volumetric expansion, causes pressure to raise.When internal pressure reaches the cracking pressure of pressure relief device 8, pressure relief device 8 is opened, and high pressure gas discharge is to low pressure vessel pipeline or to sky discharge, when pressure falls back to 85% of cracking pressure, pressure relief device 8 is closed, and valve is unlikely has an accident in protection.
The present embodiment not does any pro forma restriction to shape of the present utility model, material, structure etc.; every above embodiment is done according to technical spirit of the present utility model any simple modification, equivalent variations and modification, all belong to the protection domain of technical solutions of the utility model.
Claims (2)
1. the seal arrangement of dark bar ultralow temperature stop valve, comprise valve body, valve gap, inertance tube, valve rod and handwheel, valve body left end and right-hand member are respectively equipped with into connection mouth and go out connection mouth, valve body upper-end surface is connected by flange bolt with valve gap lower end surface, valve gap upper end is fixedly connected with inertance tube lower end, valve rod lower end passes perpendicularly through inertance tube and valve gap extend in valve body, handwheel is located at valve rod upper end, it is characterized in that: described valve rod lower end is provided with lower seal structure, is provided with sealing configuration between inertance tube upper end and valve rod; Valve gap inside is provided with the female connecting sleeve of tool, and valve rod to be located in connecting sleeve and to be threaded with connecting sleeve;
Described lower seal structure comprises flap, flap upper-end surface is provided with connecting groove, valve rod lower end is plugged in connecting groove, valve rod lower end cylindrical offers one circular groove, what be provided with in circular groove that external diameter is greater than valve rod external diameter splits annulus, flap upper-end surface is provided with the flap gland extending into and compress in connecting groove and split annulus, flap upper-end surface circle edge is along being provided with upper baffle ring, seal ring is provided with in the circular groove formed between upper baffle ring and flap gland, upper seal ring inner peripheral surface and all big up and small down conical structure of flap gland upper end cylindrical, flap gland upper end cylindrical and upper seal ring inner ring top press fit, valve gap lower end surface is provided with the upper annular flange be sealed and matched with upper seal ring upper surface, be provided with in valve body and there is surface thereof section, the dunnage of middle horizontal segment and the section of having a down dip, the middle horizontal segment of dunnage is provided with through hole and is positioned at the lower annular flange of through hole upper edge, flap lower surface central authorities and lower surface circle edge are along being respectively equipped with stud and lower baffle ring, on stud, cover has pressing plate, stud is threaded for the tightening nut of clamping platen lower surface, lower seal is provided with between lower baffle ring and pressing plate, lower seal inner peripheral surface and pressing plate outer peripheral surface are all in lower large little conical structure, pressing plate outer ring and the top press fit of lower seal inner ring, lower seal lower surface and lower annular flange up and down corresponding also in off position lower seal coordinate,
Described upper sealing configuration comprises the cylindrical shell be set in outside inertance tube, cylindrical shell upper-end surface is higher than inertance tube upper-end surface, cylinder inboard wall is provided with the annulus block contacted with inertance tube upper-end surface, combined cone filler and piston type filler pressing sleeve is provided with in the annular chamber formed between cylindrical shell and valve rod, the outer wall of piston type filler pressing sleeve is provided with the outer O type circle be sealed and matched with cylinder inboard wall, O type circle in the inwall of piston type filler pressing sleeve is provided with and is sealed and matched with valve rod outer wall, cylindrical shell top external peripheral threads is connected with filler pressure cap and locking nut, filler pressure cap top lower surface and piston type filler pressing sleeve compression fit, locking nut and filler pressure cap lower end surface compression fit.
2. the seal arrangement of dark bar ultralow temperature stop valve according to claim 1, it is characterized in that: described combined cone filler is provided with two groups from top to bottom, often organize combined cone filler and include the upper filler cover that the lower filler cover of the big up and small down conical structure of endoporus and cylindrical present little lower large conical structure, upper filler overlaps cylindrical and overlaps endoporus with lower filler and contact compression fit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420597733.3U CN204153161U (en) | 2014-10-16 | 2014-10-16 | The seal arrangement of dark bar ultralow temperature stop valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420597733.3U CN204153161U (en) | 2014-10-16 | 2014-10-16 | The seal arrangement of dark bar ultralow temperature stop valve |
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| CN204153161U true CN204153161U (en) | 2015-02-11 |
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| CN201420597733.3U Active CN204153161U (en) | 2014-10-16 | 2014-10-16 | The seal arrangement of dark bar ultralow temperature stop valve |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106015569A (en) * | 2016-07-07 | 2016-10-12 | 成都中寰流体控制设备股份有限公司 | Static conical surface sealing structure |
| CN113983214A (en) * | 2021-10-20 | 2022-01-28 | 上海沪东造船阀门有限公司 | Manual switch ultra-low temperature stop check valve |
-
2014
- 2014-10-16 CN CN201420597733.3U patent/CN204153161U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106015569A (en) * | 2016-07-07 | 2016-10-12 | 成都中寰流体控制设备股份有限公司 | Static conical surface sealing structure |
| CN113983214A (en) * | 2021-10-20 | 2022-01-28 | 上海沪东造船阀门有限公司 | Manual switch ultra-low temperature stop check valve |
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