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双联定量齿轮泵
HGP-22A
HGP-22A-F22R
HGP-22A-F33R
HGP-22A-F44R
HGP-22A-F55R
HGP-22A-F66R
HGP-22A-F88R
HGP-22A-F99R
HGP-22A-F1111R
HGP-22A-F1212R
HGP-22A-F22L
HGP-22A-F33L
HGP-22A-F44L
HGP-22A-F55L
HGP-22A-F66L
HGP-22A-F88L
HGP-22A-F99L
HGP-22A-F1111L
HGP-22A-F1212L
HGP-22A-L22R
HGP-22A-L33R
HGP-22A-L44R
HGP-22A-L55R
HGP-22A-L66R
HGP-22A-L88R
HGP-22A-L99R
HGP-22A-L1111R
HGP-22A-L1212R
HGP-22A-L22L
HGP-22A-L33L
HGP-22A-L44L
HGP-22A-L55L
HGP-22A-L66L
HGP-22A-L88L
HGP-22A-L99L
HGP-22A-L1111L
HGP-22A-L1212L
HGP-33A
HGP-33A-F44R
HGP-33A-F66R
HGP-33A-F88R
HGP-33A-F282
HGP-33A-F1111R
HGP-33A-F1313R
HGP-33A-F1414R
HGP-33A-F1717R
HGP-33A-F1919R
HGP-33A-F2323R
HGP-33A-F2525R
HGP-33A-F2828R
HGP-33A-F3030R
为改进RS-232通信距离短、速率低的缺点，RS-422定义了一种平衡通信接口，将传输速率提高到1Mb/s，传输距离延长到4英尺，并允许在一条平衡总线上连接多1个接收器。RS-422是一种单机发送、多机接收的单向、平衡传输规范，被命名为TIA/EIA-422-A标准。为扩展应用范围，EIA又于1983年在RS-422基础上制定了RS-485标准，增加了发送器的驱动能力和冲突保护特性，扩展了总线共模范围，后命名为TIA/EIA-485-A标准。
