制造标准Manufact	GB/T2624-93	规格Specification	DN50～DN1000（d≥12.5mm）	孔径比Apertureratio(β=d/D)	β=0.2～0.75
雷诺数ReD	ReD≥5×103	介质温度Mediumtemperature	t≤450℃	法兰标准Standardofflange	JB/T81-94；JB/T82-94
型号	孔板流量计

□特点及用途Characteristic and Application
标准孔板结构简单，测量准确，性能稳定，无需实流标定，适用范围广；但压损较大，要求直管段较长。
标准孔板适用于洁净、无颗粒、无腐蚀的液体、气体及蒸汽的流量测量。
The structure of standard orifice plate is simple with accurate measurement and steady perbance. It is widely applied and without marking of actual flow. The pressure loss is small but the part of straight tube should be long. It is applied to the flow measurement of liquid, gas and steam which are clean, no granule and non-corrosive.
□主要技术指标Main technical index
1、制造标准Manufacturing standard：GB/T2624-93
2、规格Specification：DN50～DN1000（d≥12.5mm）
3、孔径比Aperture ratio (β=d/D)：β=0.2～0.75
4、雷诺数ReD：ReD≥5×103
5、公称压力（表压）Nominal pressure (gauge pressure)：PN≤10MPa
6、介质温度Medium temperature：t≤450℃
7、主要部件材质Materials for main components
孔板Orifice plate：各种牌号不锈钢all kinds of brand stainless steel；
法兰、直管段：碳钢或不锈钢（任选）
flange and straight tube: carbon steel or stainless steel (by option)
8、取压方式Method of pressure taking：角接（钻孔）取压by angle connection (bore)

9、法兰标准Standard of flange：JB/T81-94；JB/T82-94