| 摘要 |
Valve arrangement for controlling the flow of fluid through a conduit and comprising a valve body with a first and a second valve port which serve, alternately, as input and output, and a valve cone arranged in the valve body which connects in its open position the valve ports with each other, and is actuated by a holding force which is greater than the force acting on the pressurized fluid side of the valve cone ( 46 ) and dependent on the medium pressure in the input port. In order to permit a flow in either direction the valve ports ( 42, 43 ) are connected to a space ( 47 ) through each their passage ( 49, 50 ) and a groove ( 48 ) serving as a variable restriction in the valve cone, each passage ( 49, 50 ) containing a valve ( 51, 52 ) which permits a flow from the valve ports ( 42, 43 ) and to the space ( 47 ) which, in turn, is associated with the valve ports through passages having each their valve ( 57, 58 ) permitting a flow from the space and each containing a control valve ( 54, 56 ) before the last-mentioned valves in the direction of flow in order to open and block the flow from the space ( 47 ) and control the opening of the valve cone ( 46 ). |
