应该是叫LS信号复制阀。The system permits a certain consumption in the load signal line to the pump, without the load signal level being affected. This enables simpler system design, with the possibility of installing logic systems in the LS circuit. 派克的K170LS手册上这么解释的。不过他们这个是内置在Inlet module里了,单独要买这个阀不知道怎么买啊?