four stroke internal combustion engine with rotary valves (bolt spherical) in replacement of the existing valve stem.

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  机译： 优化用于活塞和气缸内燃发动机的旋转阀组;密封装置;球形旋转阀组件;改进的旋转排气门;球形旋转进气阀

• 4. A SPHERICAL ROTARY EXHAUST VALVE FOR USE IN ROTARY VALVE INTERNAL COMBUSTION ENGINES [P] . IN205231B . 2007-06-29

  机译： 用于旋转阀内部燃烧发动机的球形旋转排气阀

• 5. A SPHERICAL ROTARY INTAKE VALVE FOR USE IN ROTARY VALVE INTERNAL COMBUSTION ENGINES [P] . IN205726B . 2007-06-29

  机译： 用于旋转阀内部燃烧发动机的球形旋转进气阀

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