气关式（FO）：气动执行机构不通气时调节阀保持常开，随着控制信号的增加逐渐关闭，一般用B表示气关式。
工作原理：控制系统发出控制信号4-20mA。经过阀门定位器转变为气压信号20-100KPa，或40-200KPa，80-240KPa后，进入气动薄膜执行机构，推动推杆动作，因为推杆和调节阀阀杆连接为一体，进而带动调节阀阀杆，阀芯动作，完成对管道内介质的调节过程。
台湾钰盟HONOR高压齿轮泵
1AG1P01R
1AG1P02R
1AG1P03R
1AG1P05R
1AG1P06R
1AG1P07R
1AG1P08R
1AG1P09R
1AG1P10R
1AG1P11R
1GG1P12R
1GG1P13R
1GG1P14R
1GG1P15R
1GG1P16R
1GG1P17R
1GG1P18R
1GG1P19R
1AG1P27R
1AG1P35R
2GG1P04R
2GG1P05R
2GG1P06R
2GG1P07R
2GG1P08R
2GG1P09R
2GG1P11R
2GG1P13R
2GG1P14R
2GG1P16R
2GG1P17R
2GG1P18R
2GG1P19R
2GG1P20R
2GG1P22R
2GG1P23R
2GG1P24R
2GG1P26R
2GG1P28R
