进气轴和排气轴用齿轮连接至转子轴， 并且进气轴和排气轴中的每一个都具有至少一个与进气阀口和排气阀口 对准的开口。
The intake and exhaust shafts are geared to the rotor shaft and have at least one opening each that is aligned with the intake and the exhaust valve ports.
锁拉杆系统，重型门用。交货时拉杆不分开。两端可与齿轮机构连接，这样便于齿轮壳的任何定住。
Locking bar system, for heavy doors the rod is supplied undivided. Both ends can be connected to the gear mechanism. This allows any positioning of the gear casing.
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