| 摘要 |
<p>Flow control valve (1) includes angled metering ports (37, 38 or 35', 36') in the valve sleeve (4) for directing the momentum of the fluid flow against the respective valve flow metering edges (51, 52 or 67, 69) in a direction producing an opening reaction force on the valve (5) upon initial valve opening in opposition to the usual axial flow forces tending to close the valve (5) to reduce the flow force gain acting on the valve (5). Preferably, the angled metering ports (37, 38 or 35', 36') are disposed at an angle of approximately 45° or greater from a line perpendicular to the valve axis. Also, a single set of circumferentially spaced angled metering ports (37, 38 or 35', 36') is desirably provided for each return or high pressure flow path (13, 14 or 21', 22') for producing the desired opening reaction force on the valve (1). </p> |
