초록 ▼

A reciprocating pump which substantially eliminates cavitation problems without imposing capacity and flow limitations to maintain a net positive suction head. The pump comprises a cylinder having a liquid inlet and a liquid outlet, a piston reciprocably movable within the cylinder and generally int

A reciprocating pump which substantially eliminates cavitation problems without imposing capacity and flow limitations to maintain a net positive suction head. The pump comprises a cylinder having a liquid inlet and a liquid outlet, a piston reciprocably movable within the cylinder and generally intermediate the liquid inlet and liquid outlet, the piston having a liqud flow conduit therethrough generally co-axial with the cylinder, the liquid flow conduit having an inlet end in liquid communication with the cylinder liquid inlet and an outlet end in liquid communication with the cylinder liquid outlet, a piston rod reciprocably movable generally along the axis of the cylinder for reciprocably moving the piston within the cylinder in a direction toward the cylinder liquid outlet and in a reciprocal direction and a valve operatively associated with an intermediate the piston rod and the piston liquid flow conduit inlet end for alternatively opening and closing the inlet to liquid flow, the valve being closed when the piston rod and piston are moved in the direction toward the cylinder liquid outlet and being open when the piston rod and piston are moved in the reciprocal direction. In one embodiment, the valve comprises a valve disk freely movable on one end of the piston rod.

대표청구항 ▼

A pump for saturated and near-saturated liquids, comprising: cylinder means having liquid inlet means and liquid outlet means, piston means reciprocally movable within the cylinder means and generally intermediate the liquid inlet means and liquid outlet means, the piston means having a liquid flow

A pump for saturated and near-saturated liquids, comprising: cylinder means having liquid inlet means and liquid outlet means, piston means reciprocally movable within the cylinder means and generally intermediate the liquid inlet means and liquid outlet means, the piston means having a liquid flow conduit therethrough generally co-axial with the cylinder, the liquid flow conduit having an inlet end in liquid communication with the cylinder means liquid inlet means and an outlet end in liquid communication with the cylinder means liquid outlet means, piston rod means reciprocally movable generally along the axis of the cylinder means in a direction toward the cylinder means liquid outlet means and in a reciprocal direction, and inlet valve means operatively associated with and intermediate the piston rod means and the piston means liquid flow conduit inlet end comprising a valve disk freely movable on one end of the piston rod means, the valve disk alternately opening and closing the inlet end to liquid flow, the inlet valve closing said liquid flow conduit to liquid flow when the piston rod means moves said piston means in the direction toward the cylinder means liquid outlet means, and the inlet valve opening said conduit to liquid flow when the piston rod means is moved in the reciprocal direction.