可用作流体流量的启闭和节流控制。
Can be used for both on-off and throttling control of fluid flow.
为保持阀的上游的预定不变的压力所用的控制流体流量的一种止回阀。
A check valve that controls fluid flow rates to maintain a predetermined, constant pressure upstream from the valve.
文中研究一种用于工业密闭管道流体流量测量的新型超声波多普勒流量计。
To study a new type ultrasonic Doppler flow meter for industry flow measurement of the liquid in the airtight pipeline.
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