Gate valves are offered in two designs: Parallel Disc and Flexible Wedge. Parallel Disc are position seated; Flexible Wedge are torque seated when closing.
我们提供的闸阀的结构形式具有两种：平行阀瓣和弹性楔形闸板。平行阀瓣为定位阀座密封；弹性楔形闸板在关闭时则是扭矩阀座密封。
He suggests using electric motors or shape-memory materials to repeatedly flick the end of a flexible, wedge-shaped wing, creating a wave that ripples backwards and generates forward thrust.
他建议采用电动机或者有形状记忆功能的材料来反复击打软体契形翅膀的末端，让水产生向后的涟漪从而获得向前的推力。
He suggests using electric motors or shape-memory materials to repeatedly flick the end of a flexible, wedge-shaped wing, creating a wave that ripples backwards and generates forward thrust.
他建议采用电动机或者有形状记忆功能的材料来反复击打软体契形翅膀的末端，让水产生向后的涟漪从而获得向前的推力。
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