Velan的柔性楔板，几何形状为圆形，阀杆深入阀腔，是由Velan在1960年首创。在正常的关闭扭矩范围内，这种楔板具有很大的柔性指数（达0.89
mm），能让应力补偿由于下列因素导致的阀座变形，如：管道负载，热，压力脉动，阀座的密封焊接和阀门关闭热的冷却。Velan的柔性楔板阀门与平行滑动阀门之间的区别在于作用在阀座上的很大的楔入力，加上原有的流体压力，使得阀座极其紧密，而且还不会出现黏着现象。此外，楔板导轨将阀座摩擦和刮伤减少到运动全程的最后5%阶段，从而延长了使用寿命。
The Velan flexible wedge, with round geometry
and stem low in the cavity, was pioneered by Velan in 1960. It has a large
flexibility index (up to 0.035" or 0.89 mm) within normal closing
torques and allowable stresses to compensate for seat distortions caused
by piping loads, thermal and pressure fluctuations, seal-welding of seats
and cooling down of a valve closed hot. The major difference between a
Velan flexible wedge valve and a parallel slide valve is the high wedging
force acting on the seats, which adds to the primary fluid pressure force,
resulting in superior tightness of seats and freedom from sticking. In
addition, the wedge guiding minimizes seat rubbing and scuffing as seats
are contacted only at the last 5% of total travel, resulting in long cycle
life.
- 楔腔内的低阀杆头，降低了阀门的高度，减少了阀门的重量。这些结构设计也是由Velan首创。
Low stem head in wedge cavity reduces height and
weight of valve. Design pioneered by Velan.
- 紧密的导轨系统。对于奥氏体不锈和高温应用领域，硬面楔板槽是在焊接机制导轨内精确引导的。
Tight guiding system. For austenitic stainless
and for high-temperature service, hardfaced wedge grooves are precision-guided
in welded-in machined guides.
- 阀座环较长，并且是密封焊接的，能够补偿温度波动。阀座面用钨铬钴合金6硬化，研磨和层叠为镜面光洁度。
Seat rings are long to compensate for temperature
fluctuations and are seal-welded. Seating faces are hardfaced with Stellite
6, ground and lapped to mirror finish.
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 注意：对于高温应用领域，可采用钨铬钴合金面导轨。
NOTE: STELLITE-FACED GUIDES AVAILABLE FOR HIGH
TEMPERATURE SERVICE.
阀座面经过硬化，研磨和层叠。
Seating faces are hardfaced, ground and lapped.
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