Gas governor apparatus and gas piping system
    1.
    发明授权
    Gas governor apparatus and gas piping system 失效
    气体调速器和气体管道系统

    公开(公告)号:US4915349A

    公开(公告)日:1990-04-10

    申请号:US280934

    申请日:1988-12-07

    摘要: A gas governor apparatus comprises an inner casing removably mounted on an outer casing. Further, a driving mechanism for driving a valve body to control pressure and flow rate of fluid between the valve body and a valve seat formed in the inner casing comprises a drive motor and a drive shaft. The drive shaft has a dual drive sleeve construction where an outer drive sleeve and the valve body are constituted as a rotating drive mechanism and an inner drive sleeve and the outer drive sleeve are constituted as an axial shifting drive mechanism. The outer and inner drive sleeves are axially shiftable by means of an elastic member. The valve body and the inner casing are maintained sealingly by dual expansible members. A flow passage is defined by the dual expansible members and the inner casing. An intermediate pressure chamber is switched to communicate with one of a primary pressure circuit communicating to primary pressure and a secondary pressure circuit communicating to secondary pressure by means of a three-way switching valve to permit introduction of the fluid into the intermediate pressure chamber.