40年代：出现***器，调节阀新品种进一步产生，出现隔膜阀、角型阀、蝶阀、球阀等。50年代：球阀得到较大的推广使用，三通阀代替两台单座阀投入系统。FWH系列电液换向阀HOYEA换向阀HOYEA电液换向阀华液换向阀华液FWH电液换向阀FWH-04-2B2-A220Z5L,FWH-04-2B3-A220Z5L,FWH-04-2B8-A220Z5L,FWH-06-3C2-A220Z5L,FWH-06-3***-A220Z5L,FWH-06-3C3-A220Z5L,FWH-04-3C3-D12Z5L,FWH-04-3***0-D12Z5L,FWH-04-3C60-D12Z5L,FWH-04-3C9-D12Z5L,FWH-04-3C10-D12Z5L,FWH-04-3C11-D12Z5L,FWH-04-3C12-D12Z5L,FWH-04-2D2-D12Z5L,FWH-04-2B2-D12Z5L,FWH-04-2B3-D12Z5LFWH-06-2B2-D12Z5L,FWH-06-2B3-D12Z5LFWH-06-3C60-A220Z5L,FWH-06-3C9-A220Z5LFWH-06-3C11-A220Z5L,FWH-03-3C2-A220Z5L,FWH-03-3***-A220Z5LFWH-04-3C2-A110Z5L,FWH-04-3***-A110Z5LFWH-04-3C2-D24Z5L,FWH-04-3***-D24Z5LFWH-06-3***-D24Z5LHOYEA电液换向阀部分型号如下：FWH-04-3C2-A220Z5L,FWH-04-3***-A220Z5L,FWH-04-3C3-A220Z5L,FWH-04-3***0-A220Z5L,FWH-04-3C60-A220Z5L,FWH-04-3C9-A220Z5LFWH-04-3C10-A220Z5L,FWH-04-3C11-A220Z5L,FWH-04-3C12-A220Z5LHOYEA叠加式单向阀部分型号如下：DA-02-P-31.5a-70DA-02-A-31.5a-70DA-02-B-31.5a-70DA-02-W-31.5a-70DA-02-T-31.5a-70DA-02-P-31.5b-70DA-02-A-31.5b-70DA-02-B-31.5b-70DA-02-W-31.5b-70DA-02-T-31.5b-70DA-02-P-31.5c-70DA-02-A-31.5c-70DA-02-B-31.5c-70DA-02-W-31.5c-70DA-02-T-31.5c-70DA-03-P-31.5a-70DA-03-A-31.5a-70DA-03-B-31.5a-70)