CN205173511U - Ultra -low temperature butterfly valve - Google Patents

Ultra -low temperature butterfly valve Download PDF

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Publication number
CN205173511U
CN205173511U CN201520870446.XU CN201520870446U CN205173511U CN 205173511 U CN205173511 U CN 205173511U CN 201520870446 U CN201520870446 U CN 201520870446U CN 205173511 U CN205173511 U CN 205173511U
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CN
China
Prior art keywords
valve
valve body
butterfly
ultralow temperature
filler
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CN201520870446.XU
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Chinese (zh)
Inventor
潘建新
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Jiangsu High And Middle Pressure Valve Co Ltd
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Jiangsu High And Middle Pressure Valve Co Ltd
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Priority to CN201520870446.XU priority Critical patent/CN205173511U/en
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Abstract

The utility model discloses an ultra -low temperature butterfly valve, including valve body, valve rod, butterfly plate and worm gear, be equipped with fluid passage on the valve body, valve rod and butterfly plate are established in the valve body, the butterfly plate is through round pin and valve rod fixed connection, the valve rod top is connected with the worm gear, be equipped with filler component between valve rod and the valve body, the filler component below is equipped with the filler packing ring, filler component includes that flexible graphite packs and the graphite packing packs, the filler component top is equipped with to pack in proper order presses cover and gland, gland passes through stud and valve body fixed connection, the worm gear includes the hand wheel, the hand wheel surface is equipped with the non -slip rubber sand grip. The utility model discloses still can keep good sealing performance and long service life under the environment of ultra -low temperature.

Description

A kind of ultralow temperature butterfly valve
Technical field
The utility model relates to the control field in fluid delivery system, especially relates to a kind of ultralow temperature butterfly valve in Valve controlling field.
Background technique
LNG Liquefied natural gas (LNG) is a kind of clean, efficient energy.Under the day by day significant background of environmental problem, rock gas is more and more favored as clean energy resource.Due to this trend, natural gas application technology have also been obtained and develops rapidly, and the transport field be well used because it is efficient in LNG Liquefied natural gas is especially true.China also focuses on all the more the introduction to LNG in recent years, coastal arrange a large amount of LNG receiving stations and LNG from producing in the whole flow process of consuming, need to use a large amount of valves, such valve belongs to one of Cryogenic valve.As development in recent years butterfly valve the most rapidly, also all the more important in the utilization of LNG.And domestic LNG ultralow temperature butterfly valve is remained one blank.For this reason, LNG ultralow temperature butterfly valve is developed imperative.
Summary of the invention
Problem to be solved in the utility model is, for above-mentioned shortcoming of the prior art, proposes improvement project or alternative, especially a kind of ultralow temperature butterfly valve.
For solving the problem, the scheme that the utility model adopts is as follows: a kind of ultralow temperature butterfly valve, comprises valve body, valve rod, butterfly plate and gear, it is characterized in that, described valve body is provided with fluid passage, and described valve rod and butterfly plate are located in valve body; Described butterfly plate is fixedly connected with valve rod by pin; Described valve stem top is connected with gear; Filler group is provided with between described valve rod and valve body; Filler packing ring is provided with below described filler group; Described filler group comprises flexible graphite packing and graphite packing filling; Filler pressing sleeve and Gland is provided with successively above described filler group; Described Gland is fixedly connected with valve body by stud bolt; Described gear comprises handwheel; Described handwheel outer surface is provided with anti-slip rubber raised line.
This series of valves is mainly for LNG operating mode medium, and nominal pressure 150 ~ 600lb (1lb=0.454kg), designs serviceability temperature-196 DEG C, inside nominal diameter DN200 ~ DN1000.LNG ultralow temperature butterfly valve, according to the requirement of applying working condition, has flange, lug, to Placements such as folder and butt welding.But due to ignitability and the explosivity of LNG, the Security of the LNG Subzero valve that its system equipment is supporting, reliability are higher than the requirement of General low temperature valve, and require to have refractory design.Therefore, LNG ultralow temperature butterfly valve main line many employings butt welding structure design.The LNG ultralow temperature butterfly valve of butt welding structure mainly comprises the valve body of band access opening, maintenance valve gap, butterfly plate, valve rod and filler pressing sleeve lengthening part grade component combination; Valve body is all positioned among fluid due to the sealing pair of butterfly valve, and run the wearing and tearing that must cause seal ring for a long time, the thing followed is valve seal hydraulic performance decline, and therefore butt welding connects the maintenance of butterfly valve is a problem that must solve.Traditional butterfly valve maintenance has two kinds of methods, and one is directly unloaded from pipeline by whole valve body, could take out the replacing carrying out sealing mechanism from side direction; Another kind is provided with valve gap at valve top part, when keeping in repair, being taken out by whole valve gap, realize the online replacing of butterfly plate Sealing together with the whole mechanism such as butterfly plate, valve rod from valve body.Obvious employing butt welding structure, pipe cutting can only could keep in repair by front a kind of valve, its cost and effect poor; Then a kind of maintenance is also more difficult, and not easily ensures precision.Therefore, when developing LNG ultralow temperature butterfly valve, valve body is provided with access opening, can realize whole valve body need not being disassembled from fluid pipe-line, do not need have the parts of connection all to disassemble valve rod and flap yet, namely the valve seat on replaceable valve body and the Sealing of flap, make valve on-line maintenance become more convenient, quick.
Valve seat on sealing pair valve body relies on the pressure ring that is embedded in valve body groove and screw to be fixed on valve body, and butterfly plate forms primarily of butterfly plate body, pressing plate and seal combination, and the Sealing on valve seat and butterfly plate forms sealing pair.Because the temperature under LNG normal pressure is-162 DEG C, therefore the design of sealing pair have employed metal and nonmetallic material composite structure form.
Further, ultralow temperature butterfly valve according to above-mentioned design proposal, be provided with spacer ring in the middle of described filler group, filler component cuts as upper and lower two-part by described spacer ring.
Further, ultralow temperature butterfly valve according to above-mentioned design proposal, described valve body and the butterfly plate place of closing are provided with seal ring; Pressing plate is provided with outside described seal ring; Described pressing plate is fixedly connected with valve body by socket head screw.
Further, ultralow temperature butterfly valve according to above-mentioned design proposal, described butterfly plate and the valve body place of closing are provided with the flap trim ring mated with seal ring and pressing plate; Described flap trim ring is fixedly connected with butterfly plate by socket head screw.
The design of technical characterstic Cryogenic valve, except following the design principle of general valve, also has some special requirements.First, the critical piece of valve should be considered should be able to bear very large temperature variation that is lasting or moment and the stress that causes; And the active force of various load under pressure and temperature alternation, should not there is obvious elasto plastic deformation.Except carrying out except conventional Strength co-mputation to valve body, valve gap during design, also should adopt finite element stress analysis and earthquake resistant analysis etc. to guarantee the reliability of valve products, so LNG ultralow temperature butterfly valve all with low-carbon austenitic (CF3, CF3M) for material of main part, its lower temperature resistance, resistance to pressure, wear-resisting, anti-corrosion, weldability, intensity, impact toughness, relative elongation rate and structure stability etc. are all better than other materials.Secondly, when meeting intensity and toughness requirement, the weight should making every effort to part is little, to reduce heat conduction loss.Again, the temperature stress of bearing due to valve body under worst cold case, the expansion of connecting tube and to shrink additional stress all very large, in order to the brittle failure that stress when preventing low temperature is concentrated, the wedge angle in housing, groove etc. should be avoided as far as possible.
Further, ultralow temperature butterfly valve according to above-mentioned design proposal, described seal ring is that polychlorotrifluoroethylene is made.
Further, ultralow temperature butterfly valve according to above-mentioned design proposal, is provided with sealing gasket between described flap trim ring and butterfly plate.
Further, ultralow temperature butterfly valve according to above-mentioned design proposal, described sealing gasket is that polychlorotrifluoroethylene is made.
Further, ultralow temperature butterfly valve according to above-mentioned design proposal, described valve body is provided with access opening in the side of installing stem position, is provided with the maintenance upper cover be connected with valve body detachable-type sealed in the position of access opening.
Further, ultralow temperature butterfly valve according to above-mentioned design proposal, described body base is provided with bottom; Described bottom is fixedly connected with valve body by socket head screw; Described bottom is provided with spacer; Described valve rod is arranged on spacer.
Further, ultralow temperature butterfly valve according to above-mentioned design proposal, is provided with valve lever bushing between described valve rod bottom and valve body; Described valve lever bushing lower end is provided with trip ring.
The stem packing gland elongated portion length of ultralow temperature butterfly valve is selected should according to flowing medium and the length whether using ice chest design optimization, to improve the Subzero valve performance in work condition environment.
Technique effect of the present utility model is as follows: ultralow temperature butterfly valve of the present utility model is due to the danger of its worst cold case and its medium, so the control of its detail design and production precision extremely diligently.In addition, because environment in recent years problem, safety measure and energy-conservation requirement are more and more higher, the utility model meets low loss standard technique.Ultralow temperature butterfly valve of the present utility model has epoch-making lifting relative to existing butterfly valve in sealing, filler group is set between valve rod and valve body, selected filler group is made up of flexible graphite packing and graphite packing filling, make sealing stronger more stable, and spacer ring is set in the middle part of filler group, filler component is slit into upper and lower two-part, further improves its sealing.Adopt the structure of pressing plate and the sandwiched seal ring of valve body at valve body and butterfly plate closing seam place, the flap trim ring in cooperation on butterfly plate, promotes further by sealability.And seal ring and sealing gasket adopt polychlorotrifluoroethylene to make, and also can ensure sealability in time at ultralow temperature.And it is more convenient that the anti-slip rubber raised line design on handwheel makes handwheel use.
Accompanying drawing explanation
Fig. 1 is ultralow temperature butterfly valve structure schematic diagram.
Fig. 2 is butterfly plate and valve body closing structure schematic diagram.
Wherein, 1-gear, 2-Gland, 3-filler pressing sleeve, 4-filler group, 5-filler packing ring, 6-valve body, 7-valve rod, 8-sells, 9-butterfly plate, 10-valve lever bushing, 11-trip ring, 12-spacer, 13-bottom, 14-seal ring, 15-pressing plate, 16-sealing gasket, 17-flap trim ring.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further details.
A kind of ultralow temperature butterfly valve, comprise valve body, valve rod, butterfly plate and gear, described valve body is provided with fluid passage, and described valve rod and butterfly plate are located in valve body; Described butterfly plate is fixedly connected with valve rod by pin; Described valve stem top is connected with gear; Filler group is provided with between described valve rod and valve body; Filler packing ring is provided with below described filler group; Described filler group comprises flexible graphite packing and graphite packing filling; Filler pressing sleeve and Gland is provided with successively above described filler group; Described Gland is fixedly connected with valve body by stud bolt; Described gear comprises handwheel; Described handwheel outer surface is provided with anti-slip rubber raised line, and be provided with spacer ring in the middle of described filler group, filler component cuts as upper and lower two-part by described spacer ring, and described valve body and the butterfly plate place of closing are provided with seal ring; Pressing plate is provided with outside described seal ring; Described pressing plate is fixedly connected with valve body by socket head screw, and described butterfly plate and the valve body place of closing are provided with the flap trim ring mated with seal ring and pressing plate; Described flap trim ring is fixedly connected with butterfly plate by socket head screw, and described seal ring is that polychlorotrifluoroethylene is made, and is provided with sealing gasket between described flap trim ring and butterfly plate, and described sealing gasket is that polychlorotrifluoroethylene is made.

Claims (10)

1. a ultralow temperature butterfly valve, comprises valve body, valve rod, butterfly plate and gear, it is characterized in that, described valve body is provided with fluid passage, and described valve rod and butterfly plate are located in valve body; Described butterfly plate is fixedly connected with valve rod by pin; Described valve stem top is connected with gear; Filler group is provided with between described valve rod and valve body; Filler packing ring is provided with below described filler group; Described filler group comprises flexible graphite packing and graphite packing filling; Filler pressing sleeve and Gland is provided with successively above described filler group; Described Gland is fixedly connected with valve body by stud bolt; Described gear comprises handwheel; Described handwheel outer surface is provided with anti-slip rubber raised line.
2. ultralow temperature butterfly valve according to claim 1, is characterized in that, is provided with spacer ring in the middle of described filler group, filler component cuts as upper and lower two-part by described spacer ring.
3. ultralow temperature butterfly valve according to claim 1, it is characterized in that, described valve body and the butterfly plate place of closing are provided with seal ring; Pressing plate is provided with outside described seal ring; Described pressing plate is fixedly connected with valve body by socket head screw.
4. ultralow temperature butterfly valve according to claim 3, it is characterized in that, described butterfly plate and the valve body place of closing are provided with the flap trim ring mated with seal ring and pressing plate; Described flap trim ring is fixedly connected with butterfly plate by socket head screw.
5. ultralow temperature butterfly valve according to claim 3, it is characterized in that, described seal ring is that polychlorotrifluoroethylene is made.
6. ultralow temperature butterfly valve according to claim 4, is characterized in that, be provided with sealing gasket between described flap trim ring and butterfly plate.
7. ultralow temperature butterfly valve according to claim 6, it is characterized in that, described sealing gasket is that polychlorotrifluoroethylene is made.
8. arbitrary ultralow temperature butterfly valve according to claim 1-7, is characterized in that, described valve body is provided with access opening in the side of installing stem position, is provided with the maintenance upper cover be connected with valve body detachable-type sealed in the position of access opening.
9. ultralow temperature butterfly valve according to claim 8, it is characterized in that, described body base is provided with bottom; Described bottom is fixedly connected with valve body by socket head screw; Described bottom is provided with spacer; Described valve rod is arranged on spacer.
10. ultralow temperature butterfly valve according to claim 9, is characterized in that, be provided with valve lever bushing between described valve rod bottom and valve body; Described valve lever bushing lower end is provided with trip ring.
CN201520870446.XU 2015-11-04 2015-11-04 Ultra -low temperature butterfly valve Active CN205173511U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201520870446.XU CN205173511U (en) 2015-11-04 2015-11-04 Ultra -low temperature butterfly valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201520870446.XU CN205173511U (en) 2015-11-04 2015-11-04 Ultra -low temperature butterfly valve

Publications (1)

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CN205173511U true CN205173511U (en) 2016-04-20

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106481875A (en) * 2016-12-07 2017-03-08 上海弘盛特种阀门制造股份有限公司 A kind of distraction-type ball valve of high intensity high sealing performance
CN112747127A (en) * 2021-01-13 2021-05-04 天工阀门集团有限公司 Online maintenance ultra-low temperature butterfly valve that leakproofness is good

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106481875A (en) * 2016-12-07 2017-03-08 上海弘盛特种阀门制造股份有限公司 A kind of distraction-type ball valve of high intensity high sealing performance
CN112747127A (en) * 2021-01-13 2021-05-04 天工阀门集团有限公司 Online maintenance ultra-low temperature butterfly valve that leakproofness is good

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