孔板流量计orifice plate flowmeter 原理principle： 流体通过节流件时产生压差，结合测量的压力、温度来计算流量。The fluid flow rate is calculated by combining the measured pressure and temperature. 优点merit： 坚固耐用，性能可靠，维修方便，按标准制造Durable, reliable performance, easy maintenance, according to standard manufacturing.