WGAM-10/10/210供应维拓斯VTOZ先导溢流阀VTOZ维拓斯VTOZWGAM型先导式溢流阀WGAM-10/10/100WGAM-10/10/210】WGAM-10/10/350WGAM-10/11/100WGAM-10/11/210WGAM-10/11/350WGAM-20/10/100WGAM-20/10/210WGAM-20/10/350WGAM-20/11/100WGAM-20/11/210WGAM-20/11/350WGAM-32/10/100WGAM-32/10/210WGAM-32/10/350WGAM-32/11/100WGAM-32/11/210WGAM-32/11/350WGAM-10/10/210供应维拓斯VTOZ先导溢流阀VTOZWGIR，WGIU型压力控制阀WGIU-10/10/50WGIU-10/10/100WGIU-10/10/210WGIU-10/11/50WGIU-10/11/100WGIU-10/11/210WGIR-10/10/50WGIR-10/10/100WGIRR-10/10/210WGIR-10/11/50WGIR-10/11/100WGIRR-10/11/210WGAM-10/10/210供应维拓斯VTOZ先导溢流阀先导型溢流阀有多种结构。图6.9所示是一种典型的三节同心结构先导型溢流阀，它由先导阀(PilotValve)和主阀(MainValve)两部分组成。该阀原理如图6.10所示。VTOZWQV-06型流量控制阀WQV-06/1WQV-06/6/VWQV-06/11WQV-06/16WQV-06/24/VVTOZWDP型单向阀WDR-06/4WDR-10/4WDR-15/4WDR-25/4WDR-06WDR-10WDR-15WDR-25VTOZWHMP，WKM型叠加式溢流阀WHMP-011/50WHMP-012/50WHMP-013/50WHMP-014/50WHMP-015/50WHMP-011/100WHMP-012/100WHMP-013/100WHMP-014/100WHMP-015/100WHMP-011/210WHMP-012/210WHMP-013/210WHMP-014/210WHMP-015/210WHMP-011/350WHMP-012/350WHMP-013/350WHMP-014/350WHMP-015/350WKM-011/50WKM-012/50WKM-013/50WKM-014/50WKM-015/50WKM-011/100WKM-012/100WKM-013/100WKM-014/100WKM-015/100WKM-011/210WKM-012/210WKM-013/210WKM-014/210WKM-015/210WKM-011/350WKM-012/350WKM-013/350WKM-014/350WKM-015/350图中，锥式先导阀1、主阀芯上的阻尼孔（固定节流孔）5及调压弹簧9一起构成先导级半桥分压式压力负反馈控制，负责向主阀芯6的上腔提供经过先导阀稳压后的主级指令压力P2。主阀芯是主控回路的比较器，上端面作用有主阀芯的指令力P2A2，下端面作为主回路的测压面，作用有反馈力P1A1，其合力可驱动阀芯，调节溢流口的大小，***后达到对进口压力P1进行调压和稳压的目的。)