It consists of pneumatic piston actuator and the composition of O-type ball valve, valve core sphere using cylindrical hole.
它由气动活塞式执行机构和O型球阀组成，阀芯采用圆柱形通孔球体。
It consists of pneumatic piston actuator and the composition of O-type ball valve, valve core sphere using cylindrical hole.
它由气动活塞式执行机构和O型球阀组成，阀芯采用圆柱形通孔球体。
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