球体必须包含一个能够排出到下游密封端口的反面的压力端口处。
And the ball must contain an adequate vent to the pressure port opposite of the downstream sealing port.
一进气压力，双缸端口提供的压力，双作用气缸或执行器和一个或多个渠道从排气汽缸压力。
One pressure inlet, two cylinder ports providing pressure to the double acting cylinder or actuator and one or two outlets to exhaust pressure from the cylinders.
然后在每个气体使用端口安装另外的调节装置和压力表。
Another regulator with gauge set shall be installed at every point of use.
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