| 摘要 |
<p>In order that separate hydraulic systems A,B, e.g. in a ship's steering apparatus, may be simultaneously operated it is necessary to equalize the pressure between the pumps 10, 11 in the respective systems A,B. Preferably, this is accomplished by interposing piston and cylinder assembly 128 between respective pump actuating rods 141, 143. During steering, pressures of respective systems A,B, are applied to assembly 128 at inlets 122, 121. If there is an imbalance in said pressures, piston 123 and trunnion 124 move, thereby altering the effective length of lever 125 until the stroke of pump 10 is equal to that of pump 11. Other methods of equalising pressure between pumps 10, 11 include providing pressure sensitive control valves or spill valves between each side of each system A,B.</p> |
