| 摘要 |
A static piston with a circular opening in its center, solidly attached to the cylinder head, provided with passages for gas and lubricants, is surrounded by a larger diameter double-walled moving cylinder, whose smaller, inner wall reaches down through the circular opening of the said piston to connect with a valve stem and its lock, which when pulled down, pulls the said moving cylinder against the inside gas pressure to open the valve - while the said gas pressure lifts the assembly to close it.
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