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1)  available head
可用压差
2)  available pressure difference
资用压差
1.
By comparison and analyses of methods for selecting balance valves, points out that the major difference among them lies in the determination of the available pressure difference and that the valve authority and the pressure difference between circuits should be considered simultaneously in calculation of selecting balance valves.
通过对各种平衡阀选择计算方法的对比和分析 ,指出各种方法的差别主要在于阀门资用压差的确定方法不同 ,指出在平衡阀选择计算中应同时考虑阀权度和管路平衡压差的作用 ,进而提出了一种新的平衡阀选择计算方
3)  working pressure difference
作用压差
1.
This paper advances a new method to determine the working pressure difference of any radiator,in which the temperature drop and mean temperature in each and every pipe are firstly,calculated and then the mean density of the feedwater and backwater in each vertical pipe section on any floor.
然后计算各立管段中水的平均密度,得出各层散热器作用压差的新方法。
4)  available temperature difference
可利用温差
5)  differential displacing valve
压差作用阀
6)  net pressure head
可利用压头
补充资料:可用的净正吸上压头
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性质:指泵从泵装置系统获得的可用(实际起作用)的NPSH:。NPSHA的数值可以根据泵的NPSHR确定;也可根据被送液的温度-流量等,由泵的安装条件确定,然后再要求泵的NPSHR适应已确定的NPSHA。对于化工用泵一般采用后者。无论怎样确定都必须有NPSHA≥NPSHR+0.5(m)。对于化工用泵要求NPSHA较NPSHR大10%,且不得少于0.5m。

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