| 摘要 |
<p>A fluid pressure device including a housing (13) defining a high pressure port (31) and a low pressure port (33). The housing defines a shuttle bore (35) and disposed therein is a shuttle valve assembly (51) including a shuttle spool (63). The shuttle spool (63) defines a fluid passage (87) disposed to provide fluid communication from the low pressure chamber (57) to the shuttle outlet port (85) as the shuttle spool moves from its neutral position (FIG. 2) to the end of its centered range of positions (FIG. 3). The low pressure fluid from the chamber (57) is communicated through the fluid passage (87) and acts on a shuttle poppet member (75), aiding the shuttle spool (63) and its shoulder (67) and unseating (opening) the poppet member (75), thus reducing the fluid pressure in the high pressure chamber (55) required to begin opening the shuttle valve assembly (51). Thus, diversion of fluid, for cooling or lubrication, will occur over a greater range of device operating pressures, minimizing the chance for damage to system components. <IMAGE></p> |
