| 摘要 |
<p>The area of contact (34) between the ball closure (16) and the seat (18) of a ball check valve for a standard four ball reciprocating piston pump (12) ie greatly enlarged to provide hydraulic cushioning of the ball (16) in order to quieten operation. A seat contact surface of width on the order of 6% of the balls circumference is preferred. The ball (16) is guided axially by fins on the seat (18) and its movement is limited by a button (22). The pump is used for delivering paint. <IMAGE></p> |
