美国派克PARKER气动阀,PARKER气控阀
1、气动调节阀的工作原理:气动调节阀由执行机构和调节机构组成。执行机构是调节阀的推力部件,它按控制信号压力的大小产生相应的推力,推动调节机构动作。阀体是气动调节阀的调节部件,它直接与调节介质接触,调节该流体的流量。
2.公称压力:(Nominal pressure),表示符号PN,在一定温度下应用时允许的Zui大工作压力。对碳钢阀体的控制阀,指200℃以下应用时允许的Zui大工作压力;对铸铁阀体,指120℃以下应用时允许的Zui大工作压力;对不锈钢阀体的控制阀,指250℃以下应用时允许的Zui大工作压力。当工作温度升高时,阀体的耐压会降低。
例如,公称压力为6.4MPa(PN64)的碳钢控制阀,用于300℃时的耐压为5.2MPa,用400℃时的耐压为4.1MPa,用于450℃时的耐压为2.9MPa。因此,控制阀公称压力的确定不仅要根据Zui高工作压力,还需根据Zui高工作温度和材质特性,而不仅仅只需满足公称压力大于工作压力
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