30多年来，Velan一体式、锻造、无阀帽截止阀在全世界关键的、严酷的应用领域内经受住了考验。这些考验包括高压降，蒸汽排放，蒸汽喷射，快速隔离，6000
psi (414 bar)高压气体和593oC超高温蒸汽。1981年，在对阀门性能和所有部件进行严格的测试后，我们对阀门进行了重新设计，增加了几个新的专利性能。我们能够为高压和严酷应用领域提供杰出的、耐用的、具有优异性能的阀门，对此我们非常自豪。
Velan one-piece, forged, bonnetless globe valves
have been proven in critical, tough service applications around the world
for over 30 years. This includes high pressure drop, steam blow down,
steam injection, fast acting isolation, 6,000 psi (414 bar) gas and super
heated steam at 1,100oF (593oC). In 1981, after
rigorous testing of valve performance and all its components, we redesigned
the valve and added several new patented features. It is with pride that
we offer to the user this outstanding, long-lasting, high performance
valve for high pressure and tough applications.
一体式锻造阀体
ONE-PIECE FORGED BODY |
- 没有维持压力的螺纹或螺栓
No pressure-retaining threads or bolts
- 没有需要切割的焊接，也不需要重新焊接
No welds to cut and reweld
流线型流动和自排泄水路
Streamlined flow and self-draining waterways
- 消除了沉降作用和腐蚀作用
Eliminates deposits and corrosion
- 65o斜面减少压降
65o incline reduces pressure
drop
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重型整体钨铬钴合金阀座
HEAVY INTEGRAL STELLITE SEAT |
- 关闭紧密
Tight shutoff
- 使用寿命长
Long valve life
- 易于重新抛光
Easy refacing
双孔
Double orifice
- 由于通过第二个孔消耗了侵蚀流体的能量，达到保护阀座表面的目的。
Protects seating faces because part of the
erosive flow energy dissipates through second orifice
- 在高压降排放场合允许使用标准阀门
Allows use of standard valves in high pressure
drop blow down applications
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无旋转，阀体导向滑动钨铬钴合金阀瓣
NON-SPINNING, BODY-GUIDED SOLID STELLITE DISC |
- 阀瓣在底部和顶部之间被引导。
Disc is guided at bottom and top
- 精密配合阀体，保证阀瓣-阀座对准和防止在阀杆上产生侧面推力。
Tight fit in body ensures disc-seat alignment
and prevents side thrust on stem
- 不会擦伤阀体，不会划伤或弄弯阀杆
No galling of body, scoring or bending of
stem
- 阀杆和阀瓣之间的间隙较大，从而使得阀瓣能够移动自如
Large clearance between stem and disc allows
disc to move freely
- 无法与阀杆分开，也无法用在后座上
Cannot detach from stem, as not used for
backseating
- 闭塞阀、截至止回阀或针形控制阀阀瓣
Stop, stop check or needle control disc
- 由于在阀瓣内部的下方具有两片扁钢，因此具有不旋转特性
Non-spinning feature due to two flats in
bottom area inside of the disc
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这些阀门具有下列所有的性能
The valve combines all these features:
- 最好的流动特性
Best flow characteristics
- 最好的结构和操作性能
Best design and operational features
- 实心钨铬钴合金6导轨，不旋转阀瓣
Solid Stellite 6 guided, non-spinning disc
- 封闭式，保护阀杆免受灰尘和污垢的影响
Enclosed, dust and dirt protected stem
- 最小的操作扭矩
Lowest operational torque
- 最低的维护成本
Low maintenance cost
- 在线内部维修的最简单和最快速的方法
Simplest and fastest method of in-line internal
repairs
不旋转花键阀杆
NON-ROTATING SPLINED STEM |
下列因素保证了工作和密封扭矩格外小
Extra low operating and seating torques ensured
by:
- 不旋转阀杆
Non-rotating stem
- 不扭曲施压在密封环上
No torsion applied to packing rings
- 阀杆线性导向，花键上摩擦小
Stem guided linearly in a low friction spline
- 阀杆不会擦伤或弯曲
No stem scoring or bending
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两件式刚性后座
TWO-PIECE POSITIVE BACKSEAT |
- 分开的钨铬钴合金环叠加在阀体上，固定在阀杆斜面上，形成刚性关闭
Separate Stellite ring lapped against the
body and seated against the stem bevel for positive shutoff
- 螺纹，花键衬套引导阀杆，使得所有内部构件能够简易拆卸
Threaded, splined bushing guides the stem
and allows easy removal of all internals
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有利于低污染排放的持久耐用、紧密严实的阀杆填料
LONG-LASTING, TIGHTER STEM PACKING
FOR LOW FUGITIVE EMMISSIONS |
- 不旋转阀杆
Non-rotating stem
- 经过4000 psi (275 bar)高压进行预压的密封环
Rings precompressed to approx. 4,000 psi
(275 bar)
- 组合式石墨环
Combination graphite rings
- 重型填料法兰和螺栓
Heavy packing flange and bolting
- 动负载选项
Live-loading optional
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独特的、全封闭阀杆驱动
UNIQUE, FULLY-ENCLOSED STEM NUT DRIVE |
- 良好润滑的阀杆螺母，在两个止推轴承上旋转
Well lubricated stem nut, rotating on two
thrust bearings
- 经过一万次循环测试，零部件上没有出现肉眼可见的损伤
10,000 test cycles show no visible damage
to parts
- 防尘罩和轴套保护阀杆不被污物、灰尘和沙粒伤害
Dust cover and sleeve protect stem threads
from dirt, dust and sand
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