D663系列增大了阀的额定流量。主阀芯位置采 用位移传感器进行电反馈，内置式电子放大器对阀芯位移进行闭环 控制。故障保险(Fail-Safe)功能可保障在出现意外断电故障时机器设备处于安全位置。常用型号：D661；D662；D663；D664；D665等。型号：D661-011A；D661-027C；D661-030C；D661-031A；D661-039C；D661-043D；D661-053D；D661-061D；D661-1701E；D661-1702E；D661-1703E；D661-1704E；D661-1705E；D661-1705E-5；D661-1709E；D661-1710E；D661-1715E-4；D661-1719F；D661-1722E-5；D661-1727E；D661-1729E；D661-1730E；D661-188D-4；D661-188D-5；D661-1901E；D661-1906E-4；D661-1907E-4；D661-1907E-7；D661-1912E；D661-1913E
；D661-1915E-6；D661-1918E；D661-191D-5；D661-1924E；D661-1925E；D661-1926E；D661-1927E-4；D661-192D-5；D661-1931E；D661-1932E；D661-1933E-4；D661-1933E-6；D661-1937E-4；D661-1937E-6；D661-1940E；D661-1942E；D661-1943E；D661-1945E-4；D661-1945E-6；D661-1946E；D661-1954E；D661-1955E；D661-1957ED661-1960E；D661-1962E；D661-1963E；D661-1964E；D661-1965E；D661-1966E；D661-20；D661-212D；D661-213C；D661-214D；D661-220A；D661-246A；D661-312A；D661-312A-4；D661-318B-5；D661-318D-4；D661-318D-5；D661-319D；D661-323D；D661-324D；D661-326D；D661-344A；D661-350A；D661-351A-4；D661-351A-5；D661-353B；D661-360D；D661-364B-5；D661-36；D661-369D；D661-371D；D661-386A；D661-393D；D661-4008；D661-4009；D661-4010；D661-4011；D661-4012；D661-4013；D661-4014；D661-4015；D661-4019；D661-4020B；D661-4021；D661-4022；D661-4023；D661-4024；D661-4025；D661-4026；D661-4027；D661-4028；D661-4029；D661-4030；D661-4031；D661-4032B；D661-4033；D661-4034；D661-4035；D661-4036；D661-4038；D661-4039；D661-4040；D661-4041；D661-4042；D661-4043；D661-4044；D661-4045B；D661-4046；D661-4049；D661-4050；D661-4051；D661-4053；D661-4054；D661-4055；D661-4056B；D661-4057；
D661-4058；D661-4059；D661-405D；D661-405D-4；D661-4060；d661-4061；D661-4062；D661-4064；D661-4065；D661-4066；D661-4067；D661-4068；D661-4069；D661-406D；D661-4070；D661-4071；D661-4072；D661-4073；D661-4074；D661-4075；D661-4076；D661-4077；D661-4078；D661-4079；D661-4080；D661-4081；D661-4082；D661-4083；D661-4084；D661-4085；D661-4086；D661-4088；D661-4089；D661-4090；D661-4091；D661-4096；D661-4097；D661-4098E；D661-4099；D661-4101；D661-4102；D661-4103；D661-4105；D661-4106E；D661-4107；D661-4108；D661-4109；D661-4110；