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配置钨铬钴合金6面阀座和实心钨铬钴合金6楔板
With Stellite 6 faced seat and solid Stellite 6
wedge
应用领域
APPLICATIONS
在低温阀门应用领域，Velan在世界上处于领先地位。Velan的锻造低温闸阀、截止阀和止回阀专门用于处理液化气体，如氧气、氮气、氩气、天然气、氢气或氦气（温度低达-254oC）在生产、运输和储存过程中所出现的问题。Velan独特的加长阀帽锻造阀门更安全更高效。
Velan is a world leader in valves for cryogenic
applications. Velan forged cryogenic gate, globe and check valves are
specially designed to handle the technical problems that arise in the
production, transport and storage of liquified gases such as Oxygen, Nitrogen,
Argon, Natural Gas, Hydrogen or Helium (down to -425°F/-254oC).
Velan specially adapted extended bonnet forged valves offer safe and efficient
service.
液化气体表
TABLE OF LIQUIFIED GASES |
类型
Type |
沸点
Boiling Point |
液化密度
Liquid Density
lb/ft3 |
| oC |
oF |
天然气（LNG）
Natural gas (LNG) |
-168.0 |
-270 |
26.00 |
甲烷 (CH4)
Methane (CH4) |
-161.5 |
-258 |
26.20 |
氧 (O2)
Oxygen (O2) |
-182.9 |
-296 |
71.20 |
氩（A）
Argon (A) |
-185.9 |
-303 |
87.40 |
氦（He）
Helium (He) |
-268.9 |
-452 |
7.82 |
二氧化碳(CO2)
Carbon Dioxide (CO2) |
-78.5 |
-109 |
50.60 |
空气
Air |
-194.4 |
-318 |
57.87 |
氮(N2)
Nitrogen (N2) |
-195.8 |
-320 |
50.45 |
氢 (H2)
Hydrogen (H2) |
-252.7 |
-423 |
4.43 |
绝对零度
Absolute Zero |
-273.16 |
-460 |
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注意：如果需要更详细的资料，
请参阅Velan的低温阀门样本VEL-CRYO。
NOTE: For more information consult Velan’s
Cryogenic Valves catalogue VEL-CRYO. |
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结构特点
DESIGN FEATURES
本样本中的Velan锻钢阀门的所有基本特征都适用于低温应用的特殊要求。
All basic design features of Velan forged steel
valves outlined in this catalog are adapted to special service conditions
at cryogenic temperatures.
- 具有充分的气体柱长的加长阀帽，通常由用户特别指定，可用在所有阀门上，使得阀杆填料与低温液体具有足够的距离，保证使用功能不受低温影响。
Extended bonnets with sufficient gas column length,
usually specified by customer, are supplied for all valves to keep stem
packing at sufficient distance away from the cold fluid to remain functional.
- 实心钨铬钴合金6楔板，DN15 - DN50阀门在低温应用操作时不会出现磨损现象。
Solid Stellite 6 wedges on 1/2
– 2" (15–50 mm) valves operate with no galling in cryogenic service.
- 适用于截止阀，活塞和旋启式止回阀阀瓣的Kel-F镶嵌件。
Kel-F inserts (optional) for globe, piston, and
swing check discs.
- 清洗：所有低温阀门都经过全面脱脂和清洗，管道端口经过密封，防止产生污染。
Cleaning: All cryogenic valves are thoroughly
degreased and cleaned and pipe ends are sealed to prevent contamination.
材料
MATERIALS
- 阀体和阀帽：奥氏体不锈钢锻件用在阀体和阀帽上，具有优异的冲击强度，最小的热损耗和耐腐蚀能力。
Body and bonnet: Austenitic stainless steel forgings
used for bodies and bonnets offer excellent impact strength, minimal
heat loss and protection against corrosion.
- 阀杆：为了减少磨损，阀杆采用先进的Nitronic 50 （级别XM-19 A479），即使在超级低温环境，仍然具有很高的强度，在阀杆的接触点上具有低摩擦和无磨损运动的功能。
Stem: To reduce galling, stems are made from advanced
Nitronic 50 (grade XM-19 A479) with high tensile even at extreme low
temperatures, excellent low friction and galling-free movement at points
of stem contact.
- 接触液体的部件：都采用奥氏体不锈钢和钨铬钴合金6材料。
Wetted parts: All Austenitic Stainless Steel and
Stellite 6.
- 轭架衬套：青铜。
Yoke bushings: Bronze.
- 填料：特氟隆（聚四氟乙烯）或其它塑料填料，以防止隔离的气体的气柱冷冻。
Packing: Teflon or other plastic packing protected
from freezing by a column of insulating gas.
- 阀座面：钨铬钴合金6用于防止磨损。如果要求关闭非常紧密，那么截止阀和止回阀可能需要采用Kel-F，特氟隆（聚四氟乙烯）或其它软镶嵌件。
Seating faces: Stellite 6 is used to prevent seizing
and galling. When extremely tight shutoff is required, globe and check
valves may be supplied with Kel-F, Teflon or other soft inserts.
- 螺栓：应变-硬化奥氏体不锈钢。
Bolting: Strain-hardened Austenitic Stainless
Steel.
- 轭架衬套螺母（轭架螺母）的润滑：
Exxon: Nebula EPI
Shell: Darina EPI
Lubriplate No. 930-AA or 930-AAA
Lubrication of yoke bushing nut (yoke nut):
Exxon: Nebula EPI
Shell: Darina EPI
Lubriplate No. 930-AA or 930-AAA
锻造低温阀门系列
FORGED CRYOGENIC VALVE RANGE
- 全不锈钢DN15-DN50闸阀，150-1500磅级。
All Stainless Steel 1/2
– 2” (15 – 50 mm) Gate Valves, Classes 150-1500.
- 全不锈钢DN15-DN50截止阀(1)，150-1500磅级。
All Stainless Steel 1/2
– 2” (15 – 50 mm) Globe Valves(1), Classes 150-1500.
- 全不锈钢DN15-DN50止回阀(1)，150-1500磅级。
All Stainless Steel 1/2
– 2” (15 – 50 mm) Check Valves(1), Classes 150-1500.
(1) 双密封阀瓣和Kel-F镶嵌件，可选择用于截止阀和止回阀。
(1) Dualseal disc and Kel-F insert are optional
for globe and check valves. |
